OS/2 Shareware BBS: 10 Tools/10-Tools.zip/odtlktv6.zip/ODTLKT/TOOLKIT/BOOK/OSA1.INF

OS/2 Help File | 1995-12-12 | 747KB | 16,275 lines

ΓòÉΓòÉΓòÉ 1. How to Use the OSA Guide and Reference ΓòÉΓòÉΓòÉ

This reference is a detailed technical guide and reference for application
programmers creating programs using OS/2 Warp. It gives reference information
and code examples to enable you to write source code using OSA functions,
classes, methods, and data types.

Before you begin to use this information, it would be helpful to understand how
you can:

     Expand the Contents to see all available topics
     Obtain additional information for a highlighted word or phrase
     Use action bar choices
     Use the programming information.

 How to Use the Contents

 When the Contents window first appears, some topics have a plus (+) sign
 beside them. The plus sign indicates that additional topics are available.

 To expand the Contents if you are using a mouse, click on the plus sign. If
 you are using the keyboard, use the Up or Down Arrow key to highlight the
 topic, and press the Plus (+) key. For example, Code Pages has a plus sign
 beside it. To see additional topics for that heading, click on the plus sign
 or highlight that topic and press the Plus (+) key.

 To view a topic, double-click on the topic (or press the Up Arrow or Down
 Arrow key to highlight the topic, and then press the Enter key).

 How to Obtain Additional Information

 After you select a topic, the information for that topic appears in a window.
 Highlighted words or phrases indicate that additional information is
 available. You will notice that certain words and phrases are highlighted in
 green letters, or in white letters on a black background. These are called
 hypertext terms. If you are using a mouse, double-click on the highlighted
 word. If you are using a keyboard, press the Tab key to move to the
 highlighted word, and then press the Enter key. Additional information then
 appears in a window.

 How to Use Action Bar Choices

 Several choices are available for managing information presented in this book.
 There are three pull-down menus on the action bar:  the Services menu, the
 Options menu, and the Help menu.

 The actions that are selectable from the Services menu operate on the active
 window currently displayed on the screen. These actions include the following:

 Bookmark
    Allows you to set a placeholder so you can retrieve information of interest
    to you.

    When you place a bookmark on a topic, it is added to a list of bookmarks
    you have previously set. You can view the list, and you can remove one or
    all bookmarks from the list. If you have not set any bookmarks, the list is
    empty.

    To set a bookmark, do the following:

      1. Select a topic from the Contents.

      2. When that topic appears, choose the Bookmark option from the Services
         pull-down.

      3. If you want to change the name used for the bookmark, type the new
         name in the field.

      4. Click on the Place radio button (or press the Up Arrow or Down Arrow
         key to select it).

      5. Click on OK (or select it and press Enter). The bookmark is then added
         to the bookmark list.

 Search
    Allows you to find occurrences of a word or phrase in the current topic,
    selected topics, or all topics.

    You can specify a word or phrase to be searched. You can also limit the
    search to a set of topics by first marking the topics in the Contents list.

    To search for a word or phrase in all topics, do the following:

      1. Choose the Search option from the Services pull-down.

      2. Type the word or words to be searched for.

      3. Click on All sections (or press the Up Arrow or Down Arrow keys to
         select it).

      4. Click on Search (or select it and press Enter) to begin the search.

      5. The list of topics where the word or phrase appears is displayed.

 Print
    Allows you to print one or more topics. You can also print a set of topics
    by first marking the topics in the Contents list.

    To print the document Contents list, do the following:

      1. Choose Print from the Services pull-down.

      2. Click on Contents (or press the Up Arrow or Down Arrow key to select
         it).

      3. Click on Print (or select it and press Enter).

      4. The Contents list is printed on your printer.

 Copy
    Allows you to copy a topic that you are viewing to the System Clipboard or
    to a file that you can edit. You will find this particularly useful for
    copying syntax definitions and program samples into the application that
    you are developing.

    You can copy a topic that you are viewing in two ways:

        Copy copies the topic that you are viewing into the System Clipboard.
         If you are using a Presentation Manager editor (for example, the
         System Editor) that copies or cuts (or both) to the System Clipboard,
         and pastes to the System Clipboard, you can easily add the copied
         information to your program source module.

        Copy to file copies the topic that you are viewing into a temporary
         file named TEXT.TMP. You can later edit that file by using any editor.
         You will find TEXT.TMP in the directory where your viewable document
         resides.

         To copy a topic, do the following:

           1. Expand the Contents list and select a topic.

           2. When the topic appears, choose Copy to file from the Services
              pull-down.

           3. The system puts the text pertaining to that topic into the
              temporary file named TEXT.TMP.

    For information on one of the other choices in the Services pull-down,
    highlight the choice and press the F1 key.

 The actions that are selectable from the Options menu allow you to change the
 way your Contents list is displayed. To expand the Contents and show all
 levels for all topics, choose Expand all from the Options pull-down. You can
 also press the Ctrl-* keys together. For information on one of the other
 choices in the Options pull-down, highlight the choice and press the F1 key.

 The actions that are selectable from the Help menu allow you to select
 different types of help information. You can also press the F1 key for help
 information about the Information Presentation Facility (IPF).

 How to Use the Programming Information

 This document consists of guide and reference information that provides a
 detailed description of each function, message, constant, and data type. It
 provides language-dependent information about the functions which enable the
 user to generate call statements in the C Language.

 Open Scripting Architecture programming information is presented by component,
 such as classes, instance methods, and class methods; for example:

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       Γöé            Contents                         Γöé
       Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
       Γöé                                             Γöé
       Γöé  + Notices                                  Γöé
       Γöé  + How to Use the OSA Guide and Reference   Γöé
       Γöé    .                                        Γöé
       Γöé    .                                        Γöé
       Γöé    .                                        Γöé
       Γöé  + OSA Event Manager                        Γöé
       Γöé  + OSA Classes and Methods                  Γöé
       Γöé                                             Γöé
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 By clicking on the plus sign beside "OSA Classes and Methods", you see an
 alphabetic list of the OSA classes. By clicking on the plus sign beside one of
 the classes, you see an alphabetic list  of the methods. Selecting a method
 takes you directly into the reference information for that method.

 Units of reference information are presented in selectable multiple windows or
 viewports. A viewport is a Presentation Manager window that can be sized,
 moved, minimized, maximized, or closed. By selecting a unit (in this case, an
 entry on the Contents list), you will see two windows displayed:

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     Γöé Unit Title         Γöé      Selection Title     Γöé
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     Γöé Select an item:    Γöé                          Γöé
     Γöé                    Γöé                          Γöé
     Γöé Syntax             Γöé                          Γöé
     Γöé Returns            Γöé                          Γöé
     Γöé Remarks            Γöé                          Γöé
     Γöé Related Methods    Γöé                          Γöé
     Γöé Exception Handling Γöé                          Γöé
     Γöé Override Policy    Γöé                          Γöé
     Γöé Glossary           Γöé                          Γöé
     Γöé                    Γöé                          Γöé
     ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

 The window on the left is the primary window. It contains a list of items that
 are always available to you. The window on the right is the secondary window.
 It contains a " snapshot" of the unit information. For reference units (that
 is, method descriptions), this window contains the Method Syntax.

 All of the information needed to understand a reference unit (or topic) is
 readily available to you through the primary window. The information is
 divided into discrete information groups, and only the appropriate information
 group appears for the topic that you are viewing.

 The information groups for a reference unit (that is, a method description)
 can include all or some of the following:

     Syntax
     Returns
     Remarks
     Related Methods
     Exception Handling
     Override Policy
     Glossary

 This list may vary. Some topics may be omitted when they do not apply.

 Information groups are displayed in separate viewports that are stacked in a
 third window location that overlaps the secondary window. By selecting an item
 (information group) in the primary window, the item is displayed in the third
 window location, as follows:

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   Γöé Unit Title       Γöé   Selection   Γöé   Glossary        Γöé
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   Γöé Select an item:  Γöé               Γöé Select a starting Γöé
   Γöé                  Γöé               Γöé letter of         Γöé
   Γöé    .             Γöé               Γöé glossary terms    Γöé
   Γöé    .             Γöé               Γöé                   Γöé
   Γöé    .             Γöé               Γöé A    N            Γöé
   Γöé    .             Γöé               Γöé B    O            Γöé
   Γöé    .             Γöé               Γöé C    P            Γöé
   Γöé Glossary         Γöé               Γöé .    .            Γöé
   Γöé                  Γöé               Γöé .    .            Γöé
   Γöé                  Γöé               Γöé .    .            Γöé
   Γöé                  Γöé               Γöé M    Z            Γöé
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 By selecting successive items from the primary window, additional windows are
 displayed on top of the previous windows displayed in the third window
 location. For example, in a function description, Parameters and Return Values
 are items listed in the primary window. When selected, they appear one on top
 of the other in the third window location. Because of this, you may move the
 first selected (topmost) window to the left before selecting the next item.
 This allows simultaneous display of two related pieces of information from the
 "stack" of windows in the third window location, as follows:

   ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
   Γöé Unit Title     Γöé  Parameters  Γöé  Return Values  Γöé
   Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
   Γöé Select an item Γöé              Γöé                 Γöé
   Γöé    .           Γöé              Γöé                 Γöé
   Γöé    .           Γöé              Γöé                 Γöé
   Γöé    .           Γöé              Γöé                 Γöé
   Γöé Returns        Γöé              Γöé                 Γöé
   Γöé Errors         Γöé              Γöé                 Γöé
   Γöé    .           Γöé              Γöé                 Γöé
   Γöé    .           Γöé              Γöé                 Γöé
   Γöé    .           Γöé              Γöé                 Γöé
   Γöé                Γöé              Γöé                 Γöé
   ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

 Each window can be individually closed from its system menu. All windows are
 closed when you close the primary window.

 Some secondary windows may have the appearance of a split screen. For example,
 an illustration may appear in the left half of the window, and scrollable,
 explanatory information may appear in the right half of the window. Because
 illustrations may not necessarily fit into the small window size on your
 screen, you may maximize the secondary window for better readability.


ΓòÉΓòÉΓòÉ 1.1. Conventions Used in this Reference ΓòÉΓòÉΓòÉ

The purpose of this reference is to give information about classes, methods,
constants, and data types. It provides information about the methods which
enables the user to call functions in the C programming language.

The following information is provided:

     The syntax and parameters for each method.
     The syntax of each data type and structure


ΓòÉΓòÉΓòÉ 1.2. Prerequisite Knowledge ΓòÉΓòÉΓòÉ

This book is intended for application designers and programmers who are
familiar with the following:

     C++ Programming Language
     Object-oriented programming concepts
     Object REXX

 Programming experience on a multitasking operating system would also be
 helpful.


ΓòÉΓòÉΓòÉ 1.3. Related Publications ΓòÉΓòÉΓòÉ

The following related publications might be useful when you are creating
applications that communicate with other applications through the use of
scripts:

     OSA Event Registry: Standard Suites
     Presentation Manager Programming Guide-Advanced Topics
     Presentation Manager Programming Guide-The Basics
     Presentation Manager Programming Reference
     Object REXX Programming Guide for OS/2
     Object REXX Reference for OS/2


ΓòÉΓòÉΓòÉ 1.4. Conventions Used in This Book ΓòÉΓòÉΓòÉ

The following notation and document conventions are used in this book.


ΓòÉΓòÉΓòÉ 1.4.1. Notation Conventions ΓòÉΓòÉΓòÉ

The following notation conventions are used:

 NULL             The term NULL applied to a parameter is used to indicate the
                  presence of a pointer parameter that has no value.

 NULLHANDLE       The term NULLHANDLE applied to a parameter is used to
                  indicate the presence of the handle parameter, but with no
                  value.

 Implicit Pointer If no entry for a data type "Pxxxxxxx" exists in Data Types,
                  then it is implicitly a pointer to the data type "xxxxxxx".
                  See Implicit Pointer Data Types for more information about
                  implicit pointers.


ΓòÉΓòÉΓòÉ 1.4.2. Documentation Conventions ΓòÉΓòÉΓòÉ

Throughout this library of documents, the following conventions distinguish the
different elements of text:

 bold              Menu bar and menu choices, names of keys, push buttons,
                   check boxes, radio buttons, and field names.

 plain text        Function names, structure names, data types names,
                   enumerated types, and constant names.

 italics           Parameters, structure fields, titles of documents, and first
                   occurrences of words with special meanings.

 CAPITALS          File names and error message text.

 monospace         Programming examples and user input at the command line
                   prompt or in an entry field.


ΓòÉΓòÉΓòÉ 1.5. Big and Little Endian Considerations ΓòÉΓòÉΓòÉ

OSA events use a big endian data format. Although OS/2 is a little endian
platform, it uses big endian data format for OSA events in order to maintain
compatibility and cross-platform event distribution.

The OS/2 header files have been modified to use big endian byte ordering for
all OSA-related data, including descriptor types and keywords. For example, the
OS/2 definition for the typeChar descriptor type is 'TXET' instead of 'TEXT'.

In general, all data placed into an AEDesc structure must be in big endian
format; however, there is an exception to this rule for integer data types.
These types are very pervasive, and it is important to minimize the overhead of
having to constantly convert integers back and forth from little to big endian.
To alleviate this problem, all platforms provide automatic coercion routines
for integer descriptor types. Integers can be sent in OSA events in the
platform's native format, big or little endian. They are coerced to the proper
byte order, if necessary, by coercion routines provided in the OSA Event
Manager.

The OS/2 descriptor type definition for typeLong, for example, is 'long' (it
has not been reversed). When this descriptor is extracted from an OSA event, it
is coerced, if necessary. In this case, 'gnol' is placed into an OS/2 AEDesc
structure.

Consider an integer received in an OSA event from a big endian platform. It has
'long' in the AEDesc structure. When it is extracted from the event with an
API, such as AEGetNthDesc, the desiredType parameter is 'gnol', since the OS/2
definition for typeLong is used. The OSA Event Manager invokes the 'long' to
'gnol' coercion handler and returns the integer in little endian format. In
this example, if the OSA event had been received from a little endian platform,
no coercion would be required.

The OSA integer data types that are maintained in little endian format are:

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ΓöéDescriptor Type  ΓöéData Type        ΓöéOS/2 Definition  Γöé
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ΓöétypeLongInteger  Γöésigned long      Γöélong             Γöé
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ΓöétypeShortInteger Γöésigned short     Γöéshor             Γöé
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ΓòÉΓòÉΓòÉ 1.6. Programming Considerations ΓòÉΓòÉΓòÉ

This section covers aspects of Open Scripting Architecture development that
programmers need to consider before creating PM applications or OpenDoc part
handlers.


ΓòÉΓòÉΓòÉ 1.6.1. OSA Event Registry ΓòÉΓòÉΓòÉ

This book contains refererences to a document called OSA Event Registry:
Standard Suites for OS/2. This document is not available at this time.
Eventually, it will be a cross-platform compatible version of the Apple Event
Registry: Standard Suites.

Until the new document is available, you must continue to use the Apple Event
Registry: Standard Suites with the following modifications to the event
definitions in OS/2:

     The typeAlias descriptor is replaced by typeOS2FileName
     The typeIntlText descriptor is replaced by typeOS2IText

 These changes apply to the core, required, text, and table suites as well as
 the miscellaneous standards. The types are defined in the ODOSACOM.H file.
 This file also defines the PlainITextData structure used in descriptors of
 type typeOS2IText.


ΓòÉΓòÉΓòÉ 1.6.2. Defining new  ΓòÉΓòÉΓòÉ

aete terms

In order to avoid conflicts with existing suite definitions, uppercase letters
should always be used when defining four character codes for new OSA
terminology. This minimizes conflicts with Apple defined terms.


ΓòÉΓòÉΓòÉ 1.6.3. Object REXX restrictions ΓòÉΓòÉΓòÉ

The current release of Object REXX supports compilation, get source, and
convenience. It does not support coercion, AE sending, recording, dialects, or
event handling.


ΓòÉΓòÉΓòÉ 1.6.4. Required OSA events ΓòÉΓòÉΓòÉ

OS/2 does not send any of the required events (open application, open
documents, or print documents) to an application when it is launched. These
events may be sent, however, by a scripting component or another application.


ΓòÉΓòÉΓòÉ 1.6.5. User Interaction Level ΓòÉΓòÉΓòÉ

OS/2 does not provide complete support for user interaction. While the client
can set the interaction level in events that it sends, the server cannot use
the AESetInteractionAllowed or AEInteractWithUser functions.

Because this release only supports local events sent on one machine and does
not support sending events to a remote machine, you should assume that
kAEInteractWithLocal is in effect.


ΓòÉΓòÉΓòÉ 1.7. Double-Byte Character Set (DBCS) ΓòÉΓòÉΓòÉ

Throughout this publication, you will see references to specific values for
character strings. The values are for single-byte character set (SBCS). If you
use the double-byte character set (DBCS), note that one DBCS character equals
two SBCS characters.


ΓòÉΓòÉΓòÉ 1.8. Related Publications ΓòÉΓòÉΓòÉ

The following diagram provides an overview of the OS/2 Warp Version 3 Technical
Library.

Books can be ordered by calling toll free 1-800-879-2755 weekdays between 8:00
a.m. and 8:00 p.m. (EST). In Canada, call 1-800-465-1234.


ΓòÉΓòÉΓòÉ 2. About Component Integration Laboratories ΓòÉΓòÉΓòÉ

OpenDoc is presented and maintained through an organization devoted to
promoting cross-platform standards, architectures, and protocols in a
vendor-independent fashion. This organization, Component Integration
Laboratories (CI Labs), is composed of a number of platform and application
vendors with a common interest in solving OpenDoc issues and promoting
interoperability.

CI Labs supports several levels of participation through different membership
categories. If you are interested in shaping the future direction of component
software, or if you simply need to be kept abreast of the latest developments,
you can become a member. For an information packet, send your mailing address
to:

      Component Integration Laboratories
      PO Box 61747
      Sunnyvale, CA  94088-1747

      Telephone:          [phone]
      FAX:                408-864-0380
      Internet:           [e-mail]


ΓòÉΓòÉΓòÉ 3. Interapplication Communication ΓòÉΓòÉΓòÉ

This chapter describes the interapplication communication (IAC) architecture
for the OS/2 system, summarizes how your application can take advantage of it,
and tells you where, in this book, to find the information you need to perform
specific tasks. It also introduces the OSA and describes how to make your
application scriptable-that is, capable of responding to OSA events sent to it
by a scripting component.


ΓòÉΓòÉΓòÉ 3.1. Overview of Interapplication Communication ΓòÉΓòÉΓòÉ

The interapplication communication (IAC) architecture provides a standard and
extensible mechanism for communication among OS/2 applications. The IAC
architecture makes it possible for your application to do the following:

     Provide automated copy and paste operations between your application and
      other applications

     Be manipulated by means of scripts

     Send and respond to OSA events

 The most important requirement for high-level communication among all
 applications is a common vocabulary of events. High-level events that conform
 to this protocol are called OSA events.

 The vocabulary of publicly available OSA events is published in the OSA Event
 Registry: Standard Suites, which defines the standard OSA events that
 developers have created for use by all applications. To ensure that your
 application can communicate at a high level with other applications that
 support OSA events now and in the future, you should support the standard OSA
 events that are appropriate for your application.

 The IAC architecture comprises the following parts:

     Open Scripting Architecture (OSA) provides a mechanism that allows users
      to control multiple applications by means of scripts, or sets of
      instructions, written in a variety of scripting languages. Each scripting
      language has a corresponding scripting component that is managed by the
      Component Manager. When a user executes a script, the scripting component
      sends OSA events to one or more applications to perform the actions the
      script describes.

     OSA Event Manager allows applications to send and respond to OSA events.

     Presentation Manager allows applications to send and respond to
      high-level events other than OSA events.

 The following figure shows the primary relationships among these parts. The
 managers and components toward the top of the figure rely on the managers
 beneath them. Scripting components manipulate and execute scripts with the aid
 of the OSA Event Manager. The OSA Event Manager in turn relies on the
 Presentation Manager to send OSA events.

 The following figure also shows the three principal means of communication
 provided by the IAC architecture. In addition to using scripting components to
 send OSA events on their behalf, applications can use the OSA Event Manager
 directly to send OSA events to other applications. All applications can use
 the OSA Event Manager to respond appropriately to OSA events, whether they are
 sent by a scripting component or other applications.

 The three forms of IAC shown in the previous figure can be summarized as
 follows:

     Scripting. The OSA includes the OSA Event Manager, the OSA events defined
      by the OSA Event Registry: Standard Suites, and the routines supported by
      scripting components, which applications can use via the Component
      Manager to execute scripts. Script-editing applications such as Script
      Editor (not shown in the previous figure) allow users to manipulate and
      execute scripts.

      Each scripting language has a corresponding scripting component that can
      execute scripts written in that language. Scripting components typically
      implement a text-based scripting language based on OSA events. For
      example, the Object REXX component implements Object REXX, the standard
      user scripting language defined by IBM. When the Object REXX component
      executes a script, it performs the actions described in the script,
      including sending OSA events to applications when necessary.

      Supporting Object REXX and Other Scripting Languages describes how the
      OSA makes it possible for your application to:

        -  Provide human-language equivalents to OSA event codes so that
           scripting components can send your application the appropriate OSA
           events during script execution

        -  Allow users to record their actions in the form of a script when
           using a scripting component which supports recording.

        -  Manipulate and execute scripts

     Sending and Responding to OSA Events. Your application can send OSA
      events directly to other applications to request services or information
      or to provide information. To support Object REXX and most other
      scripting languages based on OSA, your application must be able to
      respond to OSA events. Sending and Responding to OSA Events describes how
      applications can send and respond to OSA events with the aid of the OSA
      Event Manager.

 All forms of IAC are based on the premise that applications cooperate with
 each other. Both the application sending an event and the application
 receiving it must agree on the protocol for communication. You can ensure
 effective communication between your application and other OS/2 applications
 by supporting the standard OSA events defined in the OSA Event Registry:
 Standard Suites.


ΓòÉΓòÉΓòÉ 3.2. Sending and Responding to OSA Events ΓòÉΓòÉΓòÉ

The OSA Event Manager uses the Presentation Manager to send OSA events between
applications on the same computer.

Applications typically use OSA events to request services and information from
other applications or to provide services and information in response to such
requests. For example, any application can use the Get Data OSA event to
request that your application locate and return a particular set of data, such
as a table. If your application supports the Get Data event, it should be able
to recognize the event and respond by locating the requested data and returning
a copy of the data to the application that requested it.

Communication between two applications that support OSA events is initiated by
a client application, which sends an OSA event to request a service or
information. For example, a client application might request services such as
printing specific files, checking the spelling of a list of words, or
performing a numeric calculation; or it might request information, such as one
customer's address or a list of names and addresses of all customers living in
Florida. The application providing the service or the requested information is
called a server application.

The following figure shows the relationships between a client application, the
OSA Event Manager, and a server application. The client application uses OSA
Event Manager routines to create and send the OSA event, and the server
application uses OSA Event Manager routines to interpret the OSA event and
respond appropriately. If the client application requests that the server
application adds information to a reply OSA event, the server application adds
the information which the OSA Event Manager returns to the client application.

If an OSA event is one of the standard events defined in the OSA Event
Registry: Standard Suites, the client application can construct the event and
the server application can interpret it according to the standard definition
for that event. To ensure that your application can respond to OSA events sent
by other applications, you should support the standard OSA events that are
appropriate for your application.


ΓòÉΓòÉΓòÉ 3.2.1. Standard OSA Events ΓòÉΓòÉΓòÉ

The current edition of OSA Event Registry: Standard Suites defines the standard
suites of OSA events, which are groups of related events that are usually
implemented together. The OSA Event Registrar maintains the OSA Event Registry:
Standard Suites and other information about the ongoing development of OSA
event suites.

The standard suites include the following:

     The Required suite consists of four OSA events. These events are Open
      Application, Open Documents, Print Documents, and Quit Application. Your
      application must support the required OSA events as described in
      Responding to OSA Events.

     The Core suite consists of the basic OSA events, including Get Data, Set
      Data, Move, Delete, and Save, that nearly all applications use to
      communicate. You should support the OSA events in the Core suite that
      make sense for your application.

     A functional-area suite consists of a group of OSA events that support a
      related functional area. Functional-area suites include the Text suite
      and the Database suite. You can decide which functional-area suites to
      support according to which features your application provides. For
      example, most word-processing applications should support the Text suite,
      and most database applications should support the Database suite.


ΓòÉΓòÉΓòÉ 3.2.1.1. Implementing OSA Events ΓòÉΓòÉΓòÉ

You do not need to implement all OSA events at once. You should begin by
supporting the required OSA events, and then add support for the core events
and the functional-area events as appropriate for your application.

If necessary, you can extend the definitions of the standard OSA events to suit
specific capabilities of your application. You can also define your own custom
OSA events. However, only those applications that choose to support your custom
OSA events explicitly will be able to make use of them. If all applications
communicated solely by means of custom OSA events, every application would have
to support all other applications' custom events. Instead of creating custom
OSA events, try to use the standard OSA events and extend their definitions as
necessary.

OSA events describe actions to be performed by the applications that receive
them. In addition to a vocabulary of actions, or "verbs," effective
communication between applications requires a method of referring to windows,
data (such as words or graphic elements), files, folders, volumes, and other
items on which actions can be performed. The OSA Event Manager provides a
method for specifying structured names, or "noun phrases," that applications
can use to describe the objects on which OSA events act.


ΓòÉΓòÉΓòÉ 3.2.1.2. OSA Events Objects ΓòÉΓòÉΓòÉ

The OSA Event Registry: Standard Suites includes definitions for OSA event
object classes, which are simply names for objects that can be acted upon by
each kind of OSA event. Applications use these definitions and OSA Event
Manager routines to create complex descriptions of almost any discrete item in
another application or its documents. For example, an application could use OSA
Event Manager routines and standard object class definitions to construct a Get
Data event that requests "the most recent invoice to John Chapman in the
Invoices database on the Archives server" and send the event to the appropriate
application across the network.

An OSA event object is any item supported by an application, such as a word,
paragraph, shape, or document, that can be described in an OSA event. In the
example just given, the specified invoice, the Invoices database, and the
Archives server are nested OSA event objects. Nearly any item that a user can
differentiate and manipulate on an OSA-compliant system can be described as an
OSA event object of a specified object class nested within other OSA event
objects. When handling an OSA event that includes such a description, an
application must locate the specified OSA event object and perform the
requested action on it.

Most of the standard OSA events defined in the OSA Event Registry: Standard
Suites require your application to recognize specific OSA event object classes.
Support for the standard OSA events, including OSA event object classes, allows
your application to respond to requests for services or information from any
other application or process.


ΓòÉΓòÉΓòÉ 3.2.2. Handling OSA Events ΓòÉΓòÉΓòÉ

The following figure shows a common OSA event from the Core suite, the Set Data
event. The WaveDB application is the client; it sends a Set Data event to the
WaveCharter application. This event requests that WaveCharter use some new
sales figures generated by WaveDB to update the data for the chart named
"Summary of Sales" in the document named "Sales Chart." The OSA event contains
information that identifies an action-setting data-and a description of the OSA
event object on which to perform the action-"the chart named Summary of Sales
in the document named Sales Chart." The OSA event also includes the new data
for the chart.

To respond appropriately, the WaveCharter application in the previous figure
can use the OSA Event Manager to determine what kind of OSA event has been sent
and pass the event to the appropriate OSA event handler. An OSA event handler
is an application-defined function that extracts pertinent data from an OSA
event, performs the requested action, and returns a result. In this case, the
Set Data event handler must locate an OSA event object-that is, the specified
chart in the specified document-and change the data displayed in the chart as
requested.

The OSA Event Manager provides routines that a server application can use in
its OSA event handlers to take apart an OSA event and examine its contents. The
WaveCharter application in the previous figure can interpret the contents of
the Set Data OSA event according to the definition of that event in the OSA
Event Registry: Standard Suites. The Set Data event handler uses both OSA Event
Manager routines and the WaveCharter application's own routines to locate the
chart and make the requested change.

The OSA Event Manager also provides routines that a client application can use
to construct and send an OSA event. However, the most important requirement for
applications that support IAC is the ability to respond to OSA events, because
this ability is essential for an application that users can control through
scripts. The next section describes how you can use OSA events to support
scripting in your application.

OSA Events provides an overview of OSA events and describes how you can use the
OSA Event Manager to implement OSA events in your application. Responding to
OSA Events, Creating and Sending OSA Events, Resolving and Creating Object
Specifier Records, and Recording OSA Events provide detailed information about
the OSA Event Manager.


ΓòÉΓòÉΓòÉ 3.3. Supporting Object REXX and Other Scripting Languages ΓòÉΓòÉΓòÉ

A script is any collection of data that, when executed by the appropriate
program, causes a corresponding action or series of actions. For example, some
database, telecommunications, and page-layout applications allow users to
automate repetitive or conditional tasks by means of scripts written in
proprietary scripting languages.

The Open Scripting Architecture (OSA) provides a standard mechanism that allows
users to control multiple applications with scripts written in a variety of
scripting languages. Each scripting language has a corresponding scripting
component. When a scripting component executes a script, it performs the
actions described in the script, including sending OSA events to applications
if necessary.

The OSA comprises the following parts:

     The OSA Event Manager allows applications to respond to OSA events sent
      by scripting components (see the previous section, Sending and Responding
      to OSA Events).

     The OSA Event Registry: Standard Suites defines the standard vocabulary
      of OSA events.

     The standard scripting component data structures, routines, and resources
      allow applications to interact with any scripting component.

     The Object REXX component implements the Object REXX scripting language.

 The Object REXX component, which implements the Object REXX scripting
 language, is the implementation of the OSA provided by IBM.

 The following figure shows the relationships among some of these parts. The
 client application in the following figure is Script Editor, an application
 provided by IBM, that allows users to record, edit, and execute scripts. The
 client application could also be any other application that uses the standard
 scripting component routines to execute scripts. Script Editor uses the
 Component Manager to open a connection with the scripting component that
 created the script to be executed.

 Scripts can be stored in applications and documents as well as in distinct
 script files. The Script Editor allows users to execute scripts stored in
 script files.

 During script execution, scripting components perform actions described in the
 script, using the OSA Event Manager to send OSA events when necessary. The
 server applications shown in the previous figure use the OSA Event Manager to
 examine the contents of the OSA events they receive and to respond
 appropriately. A server application always responds to the same OSA event in
 the same way, regardless of whether the event is sent by a scripting component
 or directly by a client application.

 You can take advantage of the OSA in three ways:

     You can make your application scriptable, or capable of responding to OSA
      events sent to it by a scripting component. An application is scriptable
      if it does the following:

        -  Responds to the appropriate standard OSA events. See the previous
           section, Sending and Responding to OSA Events.

        -  Provides an OSA event terminology extension (aete) resource that
           describes which OSA events your application supports and the
           corresponding human-language terminology for use in scripts. The
           aete resource allows scripting components to interpret scripts
           correctly and send the appropriate OSA events to your application
           during script execution. By executing scripts, users of scriptable
      applications can perform almost any task that they would otherwise
      perform by choosing menu commands, typing, and so on. Users can also
      execute scripts to perform many tasks that might otherwise be difficult
      to accomplish, especially repetitive or conditional tasks that involve
      multiple applications.

     You can make your application recordable-that is, capable of sending OSA
      events to itself in response to user actions such as choosing a menu
      command or changing the contents of a document. After a user has turned
      on recording for a particular scripting component, the scripting
      component receives copies of all subsequent OSA events and records them
      in the form of a script.

     You can have your application manipulate and execute scripts with the aid
      of a scripting component. To do so, your application must:

        -  Use the Component Manager to open a connection with the appropriate
           component

        -  Use the standard scripting component routines to record, edit,
           compile, save, load, or execute scripts when necessary

      Users of applications that execute scripts can modify the applications'
      behavior by editing the scripts. For example, a user of an invoice
      program might be able to write a script that checks and if necessary
      updates customer information in a separate database application each time
      the user posts an invoice.

 The sections that follow describe these three kinds of scripting capabilities
 in more detail. Introduction to Scripting provides an overview of the way
 scripting components work and how you can implement support for scripting in
 your application.


ΓòÉΓòÉΓòÉ 3.3.1. Scriptable Applications ΓòÉΓòÉΓòÉ

If your application can respond to standard OSA events sent by other
applications, it can also respond to the same OSA events sent by a scripting
component. Before executing a script that controls your application, a
scripting component must associate the human-language terms used in the script
with specific OSA event codes supported by your application. Scriptable
applications provide this information in an OSA event terminology extension
(aete) resource.

Because scripting components can obtain information from aete resources about
the nature of different applications' support for OSA events, a single script
can describe complex tasks performed cooperatively by several specialized
applications. For example, a user can execute an Object REXX script to locate
all records in a database with specific characteristics, update a series of
charts based on those records, import the charts into a page-layout document,
and send the document to a remote computer on the network via electronic mail.

When a user executes such a script, the Object REXX component attempts to
perform the actions the script describes, including sending OSA events to
various applications when necessary. To map human-language terms used in the
script to the corresponding OSA events supported by each application, the
Object REXX component looks up the terms in the applications' aete resources.
Each human-language term specified by an application's aete resource has a
corresponding OSA event code. After the Object REXX component has identified
the OSA event codes for the terms used in a script, it can create and send the
OSA events that perform the actions described in the script.

To respond appropriately to the OSA events sent to it by the Object REXX
component, the database application in this example must be able to locate
records with specific characteristics so that it can identify and return the
requested data. The other applications involved must support OSA events that
perform the other actions described in the script.

One line in such a script might be a statement like this:


sc [document["Sales Chart"] chart["Summary of Sales"][~SetData(Totals)

In this statement, the word Totals is a variable that has been set earlier in
the same script to the value of the new data generated by a database
application. The statement causes the Object REXX component to send a Set Data
event updating the chart named "Summary of Sales". The following figure shows
how the Object REXX component would execute this statement. (The figure in
section Handling OSA Events shows a database application that sends a similar
Set Data event directly.)

To interpret the terms in this script statement correctly, the Object REXX
component must be able to look them up in the WaveCharter application's aete
resource, which maps those terms to the corresponding codes for OSA events,
object classes, and so on used by the OSA Event Manager. The Object REXX
component can then create and send the Set Data event to WaveCharter.

When it receives the Set Data event, the WaveCharter application uses the OSA
Event Manager to determine what kind of OSA event has been sent and to pass the
event to WaveCharter's handler for that event, which in turn locates the chart
and changes its data as requested.

Introduction to Scripting describes how the aete resource works. OSA Event
Terminology Resources describes how to define terminology for use by the Object
REXX component and how to create an aete resource.


ΓòÉΓòÉΓòÉ 3.3.2. Recordable Applications ΓòÉΓòÉΓòÉ

If you decide to make your application scriptable, you can also make it
recordable, allowing users to record their actions in your application in the
form of a script. Even users with little or no knowledge of a particular
scripting language can record their actions in recordable applications in the
form of a script. More knowledgeable users can record scripts and then edit or
combine them as desired.

Applications generally have two parts: the code that implements the
application's user interface and the code that actually performs the work of
the application when the user manipulates the interface. To make your
application fully recordable, you should separate these two parts of your
application, using OSA events to connect user actions with the work your
application performs.

Any significant user action within a recordable application should generate OSA
events which a scripting component can record as statements in a script. For
example, when a user chooses New from the File menu, a recordable application
sends itself a Create Element event, and the application's handler for that
event creates the new document. Implementing OSA events in this manner is
called factoring your application. A factored application acts as both the
client and the server application for the OSA events it sends to itself.

In general, a recordable application should generate OSA events for any user
action that could be reversed by the Undo command. A recordable application can
usually handle a greater variety of OSA events than it can record, because it
must record the same action the same way every time even though OSA events
might be able to trigger that action in several different ways.

A recordable event is any OSA event that any recordable application sends to
itself while recording is turned on for the local computer (with the exception
of events that the application indicates it does not want to be recorded).
After a user turns on recording from the Script Editor application, the OSA
Event Manager sends copies of all recordable events to the Script Editor. A
scripting component previously selected by the user handles each copied event
for the Script Editor by translating the event into the scripting component's
scripting language and recording the translation as part of a script. When a
scripting component executes a recorded script, it sends the corresponding OSA
events to the applications in which they were recorded.

The following figure illustrates how OSA event recording works. The user
performs a significant action (such as choosing New from the File menu), and
the WaveCharter application sends itself an OSA event to perform the task
associated with that action. If recording is turned on, the OSA Event Manager
automatically sends a copy of each recordable OSA event to the application (for
example, Script Editor) that initiated recording. The scripting component
handles the copy of each recordable event by translating it and recording it as
part of a script. To translate each OSA event correctly, the scripting
component must first check what equivalent human-language terminology the
WaveCharter application uses for that OSA event. The scripting component then
records the equivalent statement in the script.

Recording OSA Events describes the OSA Event Manager's recording mechanism in
more detail and explains how to use OSA events to factor your application.


ΓòÉΓòÉΓòÉ 3.3.3. Applications That Manipulate and Execute Scripts ΓòÉΓòÉΓòÉ

Scripts can be stored either as separate files with their own icons or within
documents. Your application can store and execute scripts regardless of whether
it is scriptable or recordable. If your application is scriptable, however, it
can execute scripts that control its own behavior, thus acting as both the
client application and the server application for the corresponding OSA events.

Your application can establish a connection with any scripting component that
is registered with the Component Manager on the same computer. Each scripting
component can manipulate and execute scripts written in the corresponding
scripting language when your application calls the standard scripting component
routines.

You can use the standard scripting component routines to do the following:

     Get a handle to a script so you can save the script in a script file

     Manipulate scripts associated with any part of your application or its
      documents, including both OSA event objects and other objects defined by
      the application

     Let users record and edit scripts

     Compile and execute scripts

 The following figure shows how an application might execute a script that
 controls its own behavior. The appropriate user action handler executes the
 script in response to a user action, which can be almost anything: choosing a
 menu command, clicking a button, tabbing from one table cell to another, and
 so on. The script might consist of a single statement that describes some
 default action, such as saving or printing, or a series of statements that
 describe a series of tasks, such as setting default preferences or styles. The
 following figure shows a script that corresponds to a single OSA event, but
 the script could just as easily correspond to a whole series of OSA events. If
 your application allows users to modify such a script, they can modify the
 behavior of your application to suit their needs.

 Your application can associate a script with any OSA event object or
 application-defined object and execute the script when that object is
 manipulated in some way. The script can describe actions to be taken by your
 application, as in the previous figure, or actions to be taken by several
 applications. For example, a user of a word-processing application might
 attach a script to a specific word so that the application executes the script
 whenever that word is double-clicked. Such a script could trigger OSA events
 that look up and display related information from a separate document, play a
 video, perform a calculation, play a voice annotation, and so on.

 The following figure shows one way that a script can be used to control two or
 more applications. When a user chooses the Post Invoice command in the
 accounting application, the user action handler for that menu command executes
 a default script for posting an invoice. That script might describe actions
 such as saving the invoice, updating the sales journal, and so on. The
 scripting component sends OSA events to the accounting application to perform
 these actions.

 The accounting application also allows users to open the default
 invoice-posting script in the Script Editor and modify it so that additional
 actions are performed when it is executed. For example, as shown in the
 previous figure, the script could instruct the WaveDB application to update a
 database of customer information in addition to performing the default posting
 actions. In this case, the scripting component sends OSA events to both the
 accounting application and WaveDB to carry out all the actions described by
 the script.

 There is no limit to the actions such a script can describe. In addition to
 sending the OSA events shown in the previous figure, the invoice-posting
 script could be used to trigger OSA events that cause other applications to
 perform a credit check, send the invoice to the customer by electronic mail,
 forward inventory information to a remote server on the network, and so on.

 Scripting Components describes how your application can use the standard
 scripting component routines to manipulate and execute its own scripts and
 allow users to modify those scripts.


ΓòÉΓòÉΓòÉ 4. OSA Events ΓòÉΓòÉΓòÉ

This chapter introduces OSA events and the OSA Event Manager. Later chapters
describe how your application can use the OSA Event Manager to respond to and
send OSA events, locate OSA event objects, and record OSA events.

The OSA Event Registry: Standard Suites defines both the actions performed by
the standard OSA events, or "verbs," and the standard OSA event object classes,
which can be used to create "noun phrases" describing objects on which OSA
events act. If your application uses the OSA Event Manager to respond to some
of these standard OSA events, you can make it scriptable-that is, capable of
responding to scripts written in a scripting language, such as Object REXX. In
addition, your application can use the OSA Event Manager to create and send OSA
events and to allow user actions in your application to be recorded as OSA
events.

This chapter begins by describing OSA events and some of the data structures
they contain. The rest of the chapter introduces the use of the OSA Event
Manager to:

     Respond to OSA events
     Send OSA events to request services or information
     Work with object specifier records
     Classify OSA event objects
     Locate OSA event objects

 Finally, this chapter summarizes the tasks you can perform with the OSA Event
 Manager and explains where to locate information you need to perform those
 tasks.


ΓòÉΓòÉΓòÉ 4.1. About OSA Events ΓòÉΓòÉΓòÉ

The OSA Event Manager uses the services of the Presentation Manager to send OSA
events between applications on the same computer. Applications typically use
OSA events to request services and information from other applications or to
provide services and information in response to such requests. Communication
between two applications that support OSA events is initiated by a client
application, which sends an OSA event to request a service or information. The
application providing the service or the requested information is called a
server application. An application can also send OSA events to itself, thus
acting as both client and server.

The following figure shows a common OSA event, the Open Documents event. The
WaveCharter application is the client; it requests that the WaveWriter
application open the documents named "DECEMBER.INV" and "NOVEMBER.INV." The
WaveWriter application responds to the Workplace Shell's request by opening
windows for the specified documents.

The WaveCharter application is considered the client application for the Open
Documents event shown in the previous figure because the WaveCharter
application initiates the request for a service. The WaveCharter application
can also be considered the source application for the same Open Documents
event. A source application for an OSA event is one that sends an OSA event to
another application or to itself. Similarly, the WaveWriter application can be
described as either the server application or the target application for the
Open Documents event shown in the previous figure. A target application for an
OSA event is the one addressed to receive the OSA event. The terms client
application and source application are not always synonymous, nor are the terms
server application and target application. Typically, an OSA event client
application sends an OSA event requesting a service to an OSA event server
application; in this case, the server application is the target application for
the OSA event. A server application may return information to the client in a
reply OSA event-in which case, the client application is the target application
for the reply.

To perform the requested service-that is, to open the specified documents-the
WaveWriter application shown in the previous figure first uses the OSA Event
Manager to identify the event (the Open Documents event) and to dispatch the
event to WaveWriter's handler for that OSA event. An OSA event handler is an
application-defined function that extracts pertinent data from an OSA event,
performs the requested action, and (usually) returns a result. In this case,
WaveWriter's Open Documents event handler examines the OSA event to determine
which documents to open (DECEMBER.INV and NOVEMBER.INV), then opens them as
requested.

To identify OSA events and respond appropriately, every application can rely on
a vocabulary of standard OSA events that developers have established for all
applications to use. These events are defined in the OSA Event Registry:
Standard Suites. The standard suites, or groups of related OSA events that are
usually implemented together, include the Required suite, the Core suite, and
functional-area suites such as the Text suite and the Database suite. To
function as a server application, your application should be able to respond to
all the OSA events in the Required suite and any of those in the Core and
functional-area suites that it is likely to receive. For example, most
word-processing applications should be capable of responding to the OSA events
in the Text suite, and most database applications should be capable of
responding to those in the Database suite.

If necessary, you can extend the definitions of the standard OSA events to
match specific capabilities of your application. You can also define your own
custom OSA events; however, before defining custom events, you should check
with CI Labs to find out whether you can adapt existing OSA event definitions
or definitions still under development to the needs of your application.

By supporting the standard OSA events in your application, you ensure that your
application can communicate effectively with other applications that also
support them. Instead of supporting many different custom events for a limited
number of applications, you can support a relatively small number of standard
OSA events that can be used by any number of applications.

You can begin supporting OSA events by making your application a reliable
server application: first for the required OSA events, then for the core and
functional-area OSA events as appropriate. Once your application can respond to
the appropriate standard OSA events, you can make it scriptable, or capable of
responding to instructions written in a system-wide scripting language such as
Object REXX. If necessary, your application can also send OSA events to itself
or to other applications.

About the OSA Event Manager provides more information about the steps you need
to take to support OSA events in your application.

The next section describes how OSA events can describe data and other items
within an application or its documents. Subsequent sections describe the basic
organization of OSA events and the data structures from which they are
constructed.


ΓòÉΓòÉΓòÉ 4.1.1. OSA Events and OSA Event Objects ΓòÉΓòÉΓòÉ

The Open Documents event shown in the figure found in the section About OSA
Events, like the other three required events, specifies an action and the
applications or documents to which that action applies. The OSA Event Registry:
Standard Suites provides a vocabulary of actions for use by all applications.
In addition to a vocabulary of actions, effective communication between
applications requires a method of referring to windows, data (such as words or
graphic elements), files, folders, volumes, and other discrete items on which
actions can be performed. The OSA Event Manager includes routines that allow
any application to construct or interpret "noun phrases" that describe the
objects on which OSA events act.

Most of the OSA event definitions in the OSA Event Registry: Standard Suites
include definitions of OSA event object classes, which are simply names for
objects that can be acted upon by each kind of OSA event. An OSA event object
is any distinct item supported by an application that can be described within
an OSA event. OSA event objects can be anything that an application can locate
on the basis of such a description, including items that a user can
differentiate and manipulate while using an application, such as words,
paragraphs, shapes, windows, or style formats.

The definition for each OSA event object class in the OSA Event Registry:
Standard Suites determines only how that kind of OSA event object should be
described within an OSA event, not how it should be represented internally by
an individual application. You do not have to write your application in an
object-oriented programming language to support OSA event objects. Instead, you
need to organize your application so that it can interpret a request for
specific OSA event objects, locate the objects, and perform the requested
action on them.

The following figure shows a common OSA event, the Get Data event from the Core
suite. In this example, the WaveCharter application is the client application;
it requests data contained in a specific table in a WaveWriter document. To
obtain the data it wants, the WaveCharter application must include a
description of the data in the Get Data event it sends to WaveWriter. This
description identifies the requested data as an OSA event object called a
table. The table is named "Summary of Sales" and is located in a document named
"Sales Report."

The WaveWriter application's Get Data handler extracts information about the
request, locates the specified table, and returns a result. The OSA Event
Manager provides a reply OSA event to which the WaveWriter application adds the
requested information in the form requested by the Get Data event. The OSA
Event Manager sends the reply event back to the WaveCharter application, which
can use the requested data in whatever way is appropriate-in this case,
displaying it as a pie chart.


ΓòÉΓòÉΓòÉ 4.1.2. OSA Event Attributes and Parameters ΓòÉΓòÉΓòÉ

When an application creates and sends an OSA event, the OSA Event Manager uses
arguments passed to OSA Event Manager routines to construct the data structures
that make up the OSA event. An OSA event consists of attributes (which identify
the OSA event and denote its task) and, often, parameters (which contain
information to be used by the target application).

An OSA event attribute identifies the event class, event ID, target
application, or some other characteristic of an OSA event. Taken together, the
attributes of an OSA event denote the task to be performed on any data
specified in the OSA event's parameters. A client application can use OSA Event
Manager routines to add attributes to an OSA event. After receiving an OSA
event, a server application can use OSA Event Manager routines to extract and
examine its attributes.

An OSA event parameter contains data that the target application uses. Unlike
OSA event attributes (which contain information that can be used by both the
OSA Event Manager and the target application), OSA event parameters contain
data used only by the target application. For example, the OSA Event Manager
uses the event class and event ID attributes to identify the server
application's handler for a specific OSA event, and the server application must
have a handler to process the event identified by those attributes. By
comparison, the list of documents contained in a parameter to an Open Documents
event is used only by the server application. As with attributes, a client
application can use OSA Event Manager routines to add parameters to an OSA
event, and a server application can use OSA Event Manager routines to extract
and examine the parameters of an OSA event it has received.

Note that OSA event parameters are different from the parameters of OSA Event
Manager functions. OSA event parameters are records used by the OSA Event
Manager; function parameters are arguments you pass to the function or that the
function returns to you. You can specify both OSA event parameters and OSA
event attributes in parameters to OSA Event Manager functions. For example, the
AEGetParamPtr function uses a buffer to return the data contained in an OSA
event parameter. You can specify the OSA event parameter whose data you want in
one of the parameters of the AEGetParamPtr function.


ΓòÉΓòÉΓòÉ 4.1.2.1. OSA Event Attributes ΓòÉΓòÉΓòÉ

OSA events are identified by their event class and event ID attributes. The
event class is the attribute that identifies a group of related OSA events. The
event class appears in the message field of the event record for an OSA event.
For example, the four required OSA events have the value aevt in the message
fields of their event records. The value aevt can also be represented by the
kCoreEventClass constant. Several event classes are shown here:

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ΓöéEvent Class         ΓöéValue  ΓöéDescription                      Γöé
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ΓöékAECoreSuite        Γöécore   ΓöéA core OSA event                 Γöé
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ΓöékCoreEventClass     Γöéaevt   ΓöéA required OSA event             Γöé
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The event ID is the attribute that identifies the particular OSA event within
its event class. In conjunction with the event class, the event ID uniquely
identifies the OSA event and communicates what action the OSA event should
perform. (The event IDs appear in the where field of the event record for an
OSA event. For example, the event ID of an Open Documents event has the value
odoc (which can also be represented by the kAEOpenDocuments constant). The
kCoreEventClass constant in combination with the kAEOpenDocuments constant
identifies the Open Documents event to the OSA Event Manager.

Here are the event IDs for the four required OSA events:

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ΓöéEvent ID            ΓöéValue  ΓöéDescription                      Γöé
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ΓöékAEOpenApplication  Γöéoapp   ΓöéPerform tasks required when a    Γöé
Γöé                    Γöé       Γöéuser opens your application      Γöé
Γöé                    Γöé       Γöéwithout opening or printing any  Γöé
Γöé                    Γöé       Γöédocuments                        Γöé
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ΓöékAEOpenDocuments    Γöéodoc   ΓöéOpen documents                   Γöé
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ΓöékAEPrintDocuments   Γöépdoc   ΓöéPrint documents                  Γöé
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ΓöékAEQuitApplication  Γöéquit   ΓöéQuit the application             Γöé
ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

In addition to the event class and event ID attributes, every OSA event must
include an attribute that specifies the target application's address. Remember
that the target application is the one addressed to receive the OSA event. Your
application can send an OSA event to itself or to another application.

Every OSA event must include event class, event ID, and target address
attributes. Some OSA events can include other attributes; see Keyword-Specified
Descriptor Records for a complete list.


ΓòÉΓòÉΓòÉ 4.1.2.2. OSA Event Parameters ΓòÉΓòÉΓòÉ

As with attributes, there are various kinds of OSA event parameters. A direct
parameter usually specifies the data to be acted upon by the target
application. For example, the direct parameter of the Print Documents event
contains a list of documents. Some OSA events also take additional parameters,
which the target application uses in addition to the data specified in the
direct parameter. Thus, an OSA event for arithmetic operations might include
additional parameters that specify operands in an equation.

The OSA Event Registry: Standard Suites describes all parameters as either
required or optional. A required parameter is one that must be present for the
target application to carry out the task denoted by the OSA event. An optional
parameter is a supplemental OSA event parameter that also can be used to
specify data to the target application. Optional parameters need not be
included in an OSA event; default values for optional parameters are part of
the event definition. The target application that handles the event must supply
default values if the optional parameters are omitted.

Direct parameters are usually defined as required parameters in the OSA Event
Registry: Standard Suites; additional parameters may be defined as either
required or optional. However, the OSA Event Manager does not enforce the
definitions of required and optional events. Instead, the source application
specifies, when it sends the event, which OSA event parameters the target can
treat as if they were optional.

For more information about optional parameters, see Specifying Optional
Parameters for an OSA Event.


ΓòÉΓòÉΓòÉ 4.1.2.3. Interpreting OSA Event Attributes and Parameters ΓòÉΓòÉΓòÉ

The following figure shows the major OSA event attributes and direct parameter
for the Open Documents event introduced in the figure found in the section
About OSA Events.

WM_SEMANTICEVENT is a PM message used to receive OSA events. When the
WaveWriter application receives any OSA event it calls the AEProcessOSAEvent
function to process the event. For an OSA event such as the Open Documents
event shown in the previous figure, the AEProcessOSAEvent function uses the
event class and event ID attributes to dispatch the event to the WaveWriter
application's Open Documents handler. In response, the Open Documents handler
opens the documents specified in the direct parameter.

The definition of a given OSA event in the OSA Event Registry: Standard Suites
suggests how the source application can organize the data in the OSA event's
parameters and how the target application interprets that data. The data in an
OSA event parameter may use standard or private data types and may include a
description of an OSA event object. Each OSA event handler provided by an
application should be written with the format of the expected data in mind.

OSA events can use standard data types, such as strings of text, long integers,
and Boolean values, for the corresponding data in OSA event parameters. For
example, the Get Data event can contain an optional parameter specifying the
form in which the requested data should be returned. This optional parameter
always consists of a list of four-character codes denoting desired descriptor
types in order of preference. OSA events can also use special data types
defined by the OSA Event Manager.

OSA event parameters often contain descriptions of OSA event objects. These
descriptions make use of a standard classification scheme summarized in
Classification of OSA Event Objects.

For example, every Get Data event includes a required parameter that describes
the OSA event object containing the data requested by the client application.
Thus, one application can send a Get Data event to another application,
requesting, for instance, one paragraph of a document, the first and last
paragraphs of a document, all pictures in the document, all paragraphs
containing the word "sales," or pages 10 through 12 of the document.

The following figure shows the OSA event attributes and direct parameter for
the Get Data event introduced in the figure in section OSA Events and OSA Event
Objects. The direct parameter for the Get Data event sent by the WaveCharter
application describes the requested OSA event object as a table called "Summary
of Sales" in the document "Sales Report." Both the table and the document are
OSA event objects. The description of an OSA event object always includes a
description of its location. In most cases, OSA event objects are located
inside other OSA event objects.

To process the information in the Get Data event, the WaveWriter application
calls the AEProcessOSAEvent function. The AEProcessOSAEvent function uses the
event class and event ID attributes to dispatch the event to the WaveWriter
application's handler for the Get Data OSA event. The WaveWriter application
responds to the Get Data event by resolving the description of the OSA event
object-that is, by using the AEResolve function, other OSA Event Manager
routines, and its own application-defined functions to locate the table named
"Summary of Sales." After locating the table, WaveWriter adds a copy of the
table's data to the reply event, which the OSA Event Manager then sends to the
WaveCharter application. The WaveCharter application then displays the data in
its active window.

The next section describes the data structures the OSA Event Manager uses for
OSA event attributes and parameters.


ΓòÉΓòÉΓòÉ 4.1.3. Data Structures within OSA Events ΓòÉΓòÉΓòÉ

The OSA Event Manager constructs its own internal data structures to contain
the information in an OSA event. Neither the sender nor the receiver of an OSA
event should manipulate data directly after it has been added to an OSA event;
each should rely on OSA Event Manager functions to do so.

This section describes the most important data structures used by the OSA Event
Manager to construct OSA events. The first structure described is the
descriptor record, a data structure of type AEDesc.

In some cases it is convenient for the OSA Event Manager to describe descriptor
records by data types that indicate their contents; thus, it also defines data
structures such as type AEAddressDesc, AEDescList, and AERecord, which are
descriptor records used to hold addresses, lists of other descriptor records,
and OSA event parameters, respectively. These and most of the other data
structures described in this section are formally defined as data structures of
type AEDesc; they differ only in the purposes for which they are used.


ΓòÉΓòÉΓòÉ 4.1.3.1. Descriptor Records ΓòÉΓòÉΓòÉ

Descriptor records are the building blocks used by the OSA Event Manager to
construct OSA event attributes and parameters. A descriptor record is a data
structure of type AEDesc; it consists of a handle to data and a descriptor type
that identifies the type of the data to which the handle refers.


typedef struct _AEDesc {
DescType    descriptorType;
Handle     dataHandle;
 } AEDesc;

The fields in an AEDesc record should not be manipulated directly. The OSA
Event Manager provides a set of APIs to manipulate these field.

The descriptor type is a structure of type DescType, which in turn is an
unsigned long-that is, a four-character code. Constants are usually used in
place of these four-character codes when referring to descriptor types.
Descriptor types represent various data types. Here are some of the major
descriptor type constants, their values, and the kinds of data they identify.

ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
ΓöéDescriptor Type     ΓöéValue  ΓöéDescription of data              Γöé
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ΓöétypeAEList          Γöélist   ΓöéList of descriptor records       Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöétypeAERecord        Γöéreco   ΓöéList of keyword-specified        Γöé
Γöé                    Γöé       Γöédescriptor records               Γöé
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ΓöétypeBoolean         Γöébool   Γöé1-byte Boolean value             Γöé
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ΓöétypeChar            ΓöéTEXT   ΓöéUnterminated string              Γöé
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ΓöétypeEnumerated      Γöéenum   ΓöéEnumerated data                  Γöé
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ΓöétypeKeyword         Γöékeyw   ΓöéOSA event keyword                Γöé
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ΓöétypeLongInteger     Γöélong   Γöé32-bit integer                   Γöé
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ΓöétypeMagnitude       Γöémagn   ΓöéUnsigned 32-bit integer          Γöé
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ΓöétypeNull            Γöénull   ΓöéNonexistent data (handle whose   Γöé
Γöé                    Γöé       Γöévalue is NULL)                   Γöé
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ΓöétypeOSAEvent        Γöéaevt   ΓöéOSA event record                 Γöé
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ΓöétypeShortInteger    Γöéshor   Γöé16-bit integer                   Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöétypeType            Γöétype   ΓöéFour-character code              Γöé
ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

For a complete list of the basic descriptor types used by the OSA Event
Manager, see the table in section Descriptor Records and Related Data
Structures.

The following figure illustrates the logical arrangement of a descriptor record
with a descriptor type of typeChar, which specifies that the data handle refers
to an unterminated string (in this case, the text "Summary of Sales").

The following figure illustrates the logical arrangement of a descriptor record
with a descriptor type of typeType, which specifies that the data handle refers
to a four-character code (in this case, the constant kCoreEventClass, whose
value is aevt). This descriptor record can be used in an OSA event attribute
that identifies the event class for any OSA event in the Core suite.

Every OSA event includes an attribute specifying the address of the target
application. A descriptor record that contains an application's address is
called an address descriptor record.


typedef AEDesc AEAddressDesc;

The address in an address descriptor record can be specified as one of the
following basic types:

ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
ΓöéDescriptor Type        ΓöéValue  ΓöéDescription                   Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöétypeHWND               ΓöéHWND   ΓöéWindow handle                 Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöétypePID                ΓöéPID    ΓöéProcess ID                    Γöé
ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

Like several of the other data structures defined by the OSA Event Manager for
use in OSA event attributes and OSA event parameters, an address descriptor
record is identical to a descriptor record of data type AEDesc; the only
difference is that the data for an address descriptor record must always
consist of an application's address.

Note:  Programmers should not access the fields of an AEDesc structure
directly. The internal format of the AEDesc structure will change in future
releases of OSA; in particular, the current dataHandle field will change from a
handle (pointer to a pointer) to a simple pointer. Programmers should consider
the AEDesc as an opaque, encapsulated structure and access it only through OSA
Event Manager APIs to ensure that programs will be compatible with future
releases.

     AEClearDesc
     AECreateDesc
     AEDisposeDesc
     AEDuplicateDesc
     AEGetDescData
     AESizeOfDescData


ΓòÉΓòÉΓòÉ 4.1.3.2. Keyword-Specified Descriptor Records ΓòÉΓòÉΓòÉ

After the OSA Event Manager has assembled the necessary descriptor records as
the attributes and parameters of an OSA event, your application cannot examine
the contents of the OSA event directly. Instead, your application must use OSA
Event Manager routines to request each attribute and parameter by keyword.
Keywords are arbitrary names used by the OSA Event Manager to keep track of
various descriptor records. The AEKeyword data type is defined as a
four-character code.


typedef unsigned long AEKeyword;

Constants are typically used for keywords. Here is a list of the keyword
constants for OSA event attributes:

ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
ΓöéAttribute Keyword      ΓöéValue  ΓöéDescription                   Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöékeyAddressAttr         Γöéaddr   ΓöéAddress of target or client   Γöé
Γöé                       Γöé       Γöéapplication                   Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöékeyEventClassAttr      Γöéevcl   ΓöéEvent class of OSA event      Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöékeyEventIDAttr         Γöéevid   ΓöéEvent ID of OSA event         Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöékeyEventSourceAttr     Γöéesrc   ΓöéNature of the source          Γöé
Γöé                       Γöé       Γöéapplication                   Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöékeyInteractLevelAttr   Γöéinte   ΓöéSettings for allowing the OSA Γöé
Γöé                       Γöé       ΓöéEvent Manager to bring a      Γöé
Γöé                       Γöé       Γöéserver application to the     Γöé
Γöé                       Γöé       Γöéforeground, if necessary, to  Γöé
Γöé                       Γöé       Γöéinteract with the user        Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöékeyMissedKeywordAttr   Γöémiss   ΓöéKeyword for first required    Γöé
Γöé                       Γöé       Γöéparameter remaining in an OSA Γöé
Γöé                       Γöé       Γöéevent                         Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöékeyOptionalKeywordAttr Γöéoptk   ΓöéList of keywords for          Γöé
Γöé                       Γöé       Γöéparameters of the OSA event   Γöé
Γöé                       Γöé       Γöéthat should be treated as     Γöé
Γöé                       Γöé       Γöéoptional by the target        Γöé
Γöé                       Γöé       Γöéapplication                   Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöékeyOriginalAddressAttr Γöéfrom   ΓöéAddress of original source of Γöé
Γöé                       Γöé       ΓöéOSA event if the event has    Γöé
Γöé                       Γöé       Γöébeen forwarded                Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöékeyReturnIDAttr        Γöértid   ΓöéReturn ID for reply OSA event Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöékeyTimeoutAttr         Γöétimo   ΓöéLength of time, in ticks, thatΓöé
Γöé                       Γöé       Γöéthe client will wait for a    Γöé
Γöé                       Γöé       Γöéreply or a result from the    Γöé
Γöé                       Γöé       Γöéserver                        Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöékeyTransactionIDAttr   Γöétran   ΓöéTransaction ID identifying a  Γöé
Γöé                       Γöé       Γöéseries of OSA events          Γöé
ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

Here is a list of the keyword constants for commonly used OSA event parameters:

ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
ΓöéParameter Keyword      ΓöéValue  ΓöéDescription                   Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöékeyDirectObject        Γöé----   ΓöéDirect parameter              Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöékeyErrorNumber         Γöéerrn   ΓöéError number parameter        Γöé
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ΓöékeyErrorString         Γöéerrs   ΓöéError string parameter        Γöé
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The OSA Event Registry: Standard Suites defines additional keyword constants
for OSA event parameters that can be used with specific OSA events.

The OSA Event Manager associates keywords with specific descriptor records by
means of a keyword-specified descriptor record, a data structure of type
AEKeyDesc that consists of a keyword and a descriptor record.


typedef struct _AEKeyDesc {
AEKeyword    descKey;
AEDesc      descContent;
 } AEKeyDesc;

The following figure illustrates a keyword-specified descriptor record with the
keyword keyEventClassAttr-the keyword that identifies an event class attribute.
The figure shows the logical arrangement of the event class attribute for the
Open Documents event shown in the figure in section Interpreting OSA Event
Attributes and Parameters. The descriptor record in the following figure is
identical to the one in the second figure in section Descriptor Records; its
descriptor type is typeType, and the data to which its handle refers identifies
the event class as kCoreEventClass.


ΓòÉΓòÉΓòÉ 4.1.3.3. Descriptor Lists ΓòÉΓòÉΓòÉ

When extracting data from an OSA event, you use OSA Event Manager functions to
copy data to a buffer specified by a pointer, or to return lists of descriptor
records (called descriptor lists).

As previously noted, the descriptor record (of data type AEDesc) is the
fundamental structure in OSA events, and it consists of a descriptor type and a
handle to data. A descriptor list is a data structure of type AEDescList
defined by the data type AEDesc-that is, a descriptor list is a descriptor
record whose data handle refers to a list of other descriptor records (unless
it is an empty list).


typedef AEDesc AEDescList;

Like several other OSA Event Manager data structures, a descriptor list is
identical to a descriptor record of data type AEDesc; the only difference is
that the data in a descriptor list must always consist of a list of other
descriptor records.

The following figure illustrates the logical arrangement of the descriptor list
that specifies the direct parameter of the Open Documents event shown in the
figure in section Interpreting OSA Event Attributes and Parameters.

The descriptor list in the previous figure provides the data for a
keyword-specified descriptor record. Keyword-specified descriptor records for
OSA event parameters can in turn be combined in an AE record, which is a
descriptor list of data type AERecord.


typedef AEDescList AERecord;

The handle for a descriptor list of data type AERecord refers to a list of
keyword-specified descriptor records that can be used to construct OSA event
parameters. The OSA Event Manager provides routines that allow your application
to create AE records and extract data from them when creating or responding to
OSA events.

An AE record has the descriptor type typeAERecord and can be coerced to several
other descriptor types. An OSA event record is another special descriptor list
of data type OSAEvent and descriptor type typeOSAEvent.


typedef AERecord OSAEvent;

An OSA event record describes a full-fledged OSA event. Like the data for an AE
record, the data for an OSA event record consists of a list of
keyword-specified descriptor records. Unlike an AE record, the data for an OSA
event record is divided into two parts, one for attributes and one for
parameters. This division within the OSA event record allows the OSA Event
Manager to distinguish between an OSA event's attributes and its parameters.

Descriptor lists, AE records, and OSA event records are all descriptor records
whose handles refer to a nested list of other descriptor records. The data
associated with each data type may be organized differently and is used by the
OSA Event Manager for different purposes. In each case, however, the data is
identified by a handle in a descriptor record. This means that you can pass an
OSA event record to any OSA Event Manager function that expects an AE record.
Similarly, you can pass OSA event records and AE records, as well as descriptor
lists and descriptor records, to any OSA Event Manager functions that expect
records of data type AEDesc.

When you use the AECreateOSAEvent function, the OSA Event Manager creates an
OSA event record containing the attributes for an OSA event's event class,
event ID, target address, return ID, and transaction ID. You then use OSA Event
Manager functions such as AEPutParamDesc and AEPutAttributeDesc to add or
modify attributes and to add any necessary parameters to the OSA event.

The following figure shows an example of a complete OSA event-a data structure
of type OSAEvent containing a list of keyword-specified descriptor records that
name the attributes and parameters of an Open Documents event. The figure
includes the event class attribute shown in the figure in section
Keyword-Specified Descriptor Records and the descriptor list shown in the
previous figure, which forms the direct parameter-the keyword-specified
descriptor record with the keyword keyDirectObject. The entire figure
corresponds to the Open Documents event shown in the figure in section
Interpreting OSA Event Attributes and Parameters.

The next two sections provide a quick overview of the steps your application
must take to respond to and send OSA events.


ΓòÉΓòÉΓòÉ 4.2. Responding to OSA Events ΓòÉΓòÉΓòÉ

A client application typically uses the OSA Event Manager to create and send an
OSA event which requests a service or information. A server application
responds by using the OSA Event Manager to process the OSA event, extract data
from the attributes and parameters of the OSA event, and if necessary add
requested data to the reply event returned by the OSA Event Manager to the
client application. The server usually provides its own OSA event handler for
performing the action requested by the client's OSA event.

As its first step in supporting OSA events, your application should support the
required OSA events. Your application should also be able to respond to the
standard OSA events that other applications are likely to send to it or that it
can send to itself. This section provides a quick overview of the tasks your
application must perform in responding to OSA events.

To respond to OSA events, your application must do the following:

     Create an object window to receive OSA events
     Use the AEInstallEventHandler function to install its OSA event handlers
     Provide OSA event handlers for the OSA events it supports
     Test for WM_SEMANTICEVENT in the object window's window procedure
     Use the AEProcessOSAEvent function to process OSA events


ΓòÉΓòÉΓòÉ 4.2.1. Accepting and Processing OSA Events ΓòÉΓòÉΓòÉ

The semantic event record is identified by the param1 field of the
WM_SEMANTICEVENT message.

The AEProcessOSAEvent function is used to process an OSAE event. The following
figure shows how the WaveWriter application accepts and begins to process an
OSA event sent by the Workplace Shell.

The AEProcessOSAEvent function first identifies the OSA event by examining the
data in the event class and event ID attributes. The function then uses that
data to call the OSA event handler that your application provides for that
event. The OSA event handler extracts the pertinent data from the OSA event,
performs the requested action, and returns a result. For example, if the event
has an event class of kCoreEventClass and an event ID of kAEOpenDocuments, the
AEProcessOSAEvent function calls your application's handler for the Open
Documents event.

Before your application attempts to accept or process any OSA events, it must
use the AEInstallEventHandler function to install OSA event handlers. This
function installs handlers in an OSA event dispatch table for your application;
the OSA Event Manager uses this table to map OSA events to handlers in your
application. When your application calls the AEProcessOSAEvent function to
process an OSA event, the OSA Event Manager checks the OSA event dispatch table
and, if your application has installed a handler for that OSA event, calls that
handler. The following figure shows how the flow of control passes from your
application to the OSA Event Manager and back to your application.


ΓòÉΓòÉΓòÉ 4.2.2. About OSA Event Handlers ΓòÉΓòÉΓòÉ

Your OSA event handlers must generally perform the following tasks:

     Extract the parameters and attributes from the OSA event

     Check that all the required parameters have been extracted

     Locate any OSA event objects specified by object specifier records in the
      OSA event parameters

     Perform the action requested by the OSA event

     Dispose of any copies of descriptor records that have been created

     Add information to the reply OSA event if requested

 This section describes how your application's OSA event handlers can use the
 OSA Event Manager to accomplish some of these tasks. Responding to OSA Events
 provides detailed information about handling OSA events.


ΓòÉΓòÉΓòÉ 4.2.2.1. Extracting and Checking Data ΓòÉΓòÉΓòÉ

You must use OSA Event Manager functions to extract the data from OSA events.
You can also use OSA Event Manager functions to extract data from descriptor
records, descriptor lists, and AE records. Most of these routines are available
in two forms: they either return a copy of the data in a buffer or return a
copy of the descriptor record for the data, including a copy of the data.

The following list shows the main functions you can use to access the data of
an OSA event:

 Function               Description

 AEGetParamPtr          Uses a buffer to return a copy of the data contained in
                        an OSA event parameter. Usually used to extract data of
                        fixed length or known maximum length; for example, to
                        extract the result code from the keyErrorNumber
                        parameter of a reply OSA event.

 AEGetParamDesc         Returns a copy of the descriptor record or descriptor
                        list for an OSA event parameter. Usually used to
                        extract data of variable length; for example, to
                        extract the descriptor list for a list of file names
                        specified in the direct parameter of the Open Documents
                        event.

 AEGetParamPtr          Uses a buffer to return a copy of the data contained in
                        an OSA event attribute. Used to extract data of fixed
                        length or known maximum length; for example, to
                        determine the source of an OSA event by extracting the
                        data from the keyEventSourceAttr attribute.

 AEGetAttributeDesc     Returns a copy of the descriptor record for an
                        attribute. Used to extract data of variable length; for
                        example, to make a copy of a descriptor record
                        containing the address of an application.

 AECountItems           Returns the number of descriptor records in a
                        descriptor list. Used, for example, to determine the
                        number of file names for documents specified in the
                        direct parameter of the Open Documents event.

 AEGetNthPtr            Uses a buffer to return a copy of the data for a
                        descriptor record contained in a descriptor list. Used
                        to extract data of fixed length or known maximum
                        length; for example, to extract the name and location
                        of a document from the descriptor list specified in the
                        direct parameter of the Open Documents event.

 AEGetNthDesc           Returns a copy of a descriptor record from a descriptor
                        list. Used to extract data of variable length; for
                        example, to get the descriptor record containing an
                        file name from the list specified in the direct
                        parameter of the Open Documents event.

 You can specify the descriptor type of the resulting data for these functions;
 if this type is different from the descriptor type of the attribute or
 parameter, the OSA Event Manager attempts to coerce it to the specified type.
 For example, if a parameter has a descriptor type of long integer, you can
 coerce the data to a string representation of the integer by using typeChar
 when extracting the data.

 After extracting all known OSA event parameters, your handler should check
 that it retrieved all the parameters that the source application considered to
 be required. To do so, determine whether the keyMissedKeywordAttr attribute
 exists. If so, your handler has not retrieved all the required parameters, and
 it should return an error.

 Although the OSA Event Registry: Standard Suites defines OSA event parameters
 as either required or optional, the OSA Event Manager does not enforce the
 definitions of required and optional events. Instead, the source application
 specifies, when it sends the event, which OSA event parameters the target can
 treat as if they were optional. For more information about optional
 parameters, see Specifying Optional Parameters for an OSA Event.

 If any of the OSA event parameters include object specifier records, your
 handler should use the AEResolve function, other OSA Event Manager routines,
 and your own application-defined functions to locate the corresponding OSA
 event objects. For more information about locating OSA event objects, see
 Working with Object Specifier Records.


ΓòÉΓòÉΓòÉ 4.2.2.2. Performing the Requested Action and Returning a Result ΓòÉΓòÉΓòÉ

When your application responds to an OSA event, it should perform the standard
action requested by that event. For example, your application should respond to
the Open Documents event by opening the specified documents in titled windows
just as if the user had selected each document and then chosen Open from the
File menu.

Many OSA events can ask your application to return data. For instance, if your
application is a spelling checker, the client application might expect your
application to return data in the form of a list of misspelled words. The
second figure in section Data Structures within an Object Specifier Record
shows a similar example: a Get Data event that asks the server application to
locate a specific OSA event object and return the data associated with it.

If the client application requests a reply, the OSA Event Manager prepares a
reply OSA event by passing a default reply OSA event to your handler. If the
client application does not request a reply, the OSA Event Manager passes a
null descriptor record-that is, a descriptor record of type typeNull whose data
handle has the value NULL-to your handler instead of a default reply OSA event.
The default reply OSA event has no parameters when it is passed to your
handler, but your handler can add parameters to it. If your application is a
spelling checker, for example, you can return a list of misspelled words in a
parameter; however, your handler should check whether the reply OSA event
exists before attempting to add any attributes or parameters to it. Any attempt
to add an OSA event attribute or parameter to a null descriptor record
generates an error.

When you extract a descriptor record using the AEGetParamDesc,
AEGetAttributeDesc, AEGetNthDesc, or AEGetKeyDesc function, the OSA Event
Manager creates a copy of the descriptor record for you to use. When your
handler is finished using a copy of a descriptor record, you should dispose of
it-and thereby deallocate the memory used by its data-by calling the
AEDisposeDesc function.

Note:  Outputs from functions such as AEGetKeyPtr and other routines whose
names end in -Ptr use a buffer rather than a descriptor record to return data.
Because these functions do not require the use of AEDisposeDesc, it is
preferable to use them.

Your OSA event handler should always set its function result either to noErr if
it successfully handles the OSA event or to a nonzero result code if an error
occurs. If your handler returns a nonzero result code, the OSA Event Manager
adds a keyErrorNumber parameter to the reply OSA event (unless you have already
added a keyErrorNumber parameter). This parameter contains the result code that
your handler returns. The client should check whether the keyErrorNumber
parameter exists to determine whether your handler performed the requested
action. In addition to returning a result code, your handler can also return an
error string in the keyErrorString parameter of the reply OSA event. The client
can use this string in an error message to the user.

If the client application requested a reply, the OSA Event Manager returns the
reply OSA event, which is identified by the event class kCoreEventClass and by
the event ID kAEAnswer. When the client has finished using the reply OSA event,
it should dispose of both the reply event and the original event-and thereby
deallocate the memory they use-by calling the AEDisposeDesc function. The OSA
Event Manager takes care of disposing both the OSA event and the reply OSA
event after a server application's handler returns to AEProcessOSAEvent, but a
server application is responsible for disposing of any OSA event data
structures it creates while extracting data from the OSA event.

The following figure shows the entire process of responding to an OSA event.

When your handler returns a result code to the OSA Event Manager, you have
finished your response to the client application's OSA event.


ΓòÉΓòÉΓòÉ 4.3. Creating and Sending OSA Events ΓòÉΓòÉΓòÉ

Your application can use OSA events to request services or information from
other applications, send information to other applications, or trigger actions
within your application. For example, you can use the core OSA event Get Data
to request specific data from another application's documents. Similarly, you
can use other OSA events to request services-for example, asking a
spell-checking application to check the text in a document created by your
application. Consult the OSA Event Registry: Standard Suites for the format and
function of the standard OSA events that you want your application to send.

To communicate with another application by sending an OSA event, your
application must do the following:

     Create an OSA event record by calling the AECreateOSAEvent function

     Use OSA Event Manager functions to add parameters and any additional
      attributes to the OSA event

     call the AESend function to send the OSA event

     Dispose of any copies of descriptor records that you have created

     Handle the reply OSA event (if necessary)

 The sections that follow describe how your application can use the OSA Event
 Manager to accomplish these tasks. Creating and Sending OSA Events provides
 detailed information about creating and sending OSA events.

 To act as a server for your application, the target application must support
 OSA events. The server can be your own application or another application
 running on your computer.


ΓòÉΓòÉΓòÉ 4.3.1. Creating an OSA Event Record ΓòÉΓòÉΓòÉ

Use the AECreateOSAEvent function to create an OSA event record. Using the
arguments you pass to the AECreateOSAEvent function, the OSA Event Manager
constructs the data structures describing the event class, the event ID, and
the target address attributes of an OSA event. The event class and event ID, of
course, identify the particular event you wish to send. The target address
identifies the intended recipient of the OSA event.

You can specify two other attributes with the AECreateOSAEvent function: the
reply ID and the transaction ID. For the reply ID attribute, you usually
specify the kAutoGenerateReturnID constant to the AECreateOSAEvent function.
This constant ensures that the OSA Event Manager generates a unique return ID
for the reply OSA event returned from the server. For the transaction ID
attribute, you usually specify the kAnyTransactionID constant, which indicates
that this OSA event is not one of a series of interdependent OSA events.


ΓòÉΓòÉΓòÉ 4.3.2. Adding OSA Event Attributes and Parameters ΓòÉΓòÉΓòÉ

The OSA event record created with the AECreateOSAEvent function serves as a
foundation for the OSA event you want to send. Descriptor records and
descriptor lists are the building blocks from which the complete OSA event
record is constructed. To create descriptor records and descriptor lists and
add items to a descriptor list, use the following functions:

 Function          Description

 AECreateDesc      Takes a descriptor type and a pointer to data and converts
                   them into a descriptor record

 AECreateList      Creates an empty descriptor list or AE record.

 AEPutPtr          Takes a descriptor type and a pointer to data and adds the
                   data to a descriptor list as a descriptor record; used, for
                   example, to add to a descriptor list a number used as the
                   parameter of an OSA event requesting a calculation.

 AEPutDesc         Adds a descriptor record to a descriptor list; used, for
                   example, to add to a descriptor list a file name used as the
                   direct parameter of an OSA event requesting file
                   manipulation.

 To add the remaining attributes and parameters necessary for your OSA event to
 the OSA event record, you can use these additional OSA Event Manager
 functions:

 Function               Description

 AEPutParamPtr          Takes a keyword, descriptor type, and pointer to data
                        and adds the data to an OSA event record as a parameter
                        with the specified keyword (replacing any existing
                        parameter with the same keyword); used, for example, to
                        put numbers into the parameters of an OSA event that
                        asks the server to perform a calculation.

 AEPutParamDesc         Takes a keyword and a descriptor record and adds the
                        descriptor record to an OSA event record as a parameter
                        with the specified keyword (replacing any existing
                        parameter with the same keyword); used, for example, to
                        place a descriptor list containing file names into the
                        direct parameter of an OSA event that requests a server
                        to manipulate files.

 AEPutAttributePtr      Takes a keyword, descriptor type, and pointer to data
                        and adds the descriptor record to an OSA event record
                        as an attribute with the specified keyword (replacing
                        any existing attribute with the same keyword); used,
                        for example, to change the transaction ID of an OSA
                        event record that is waiting to be sent.

 AEPutAttributeDesc     Takes a keyword and a descriptor record and adds the
                        descriptor record to an OSA event record as an
                        attribute with the specified keyword (replacing any
                        existing attribute with the same keyword); used, for
                        example, to replace the descriptor record used for the
                        target address attribute in an OSA event record waiting
                        to be sent.

 OSA event parameters for core events and functional-area events can include
 descriptions of OSA event objects in special descriptor records called object
 specifier records. For an overview of object specifier records, see Working
 with Object Specifier Records.


ΓòÉΓòÉΓòÉ 4.3.3. Sending an OSA Event and Handling the Reply ΓòÉΓòÉΓòÉ

After you add all the attributes and parameters required for the OSA event, use
the AESend function to send the OSA event. The OSA Event Manager uses the
Presentation Manager to transmit the OSA event to the server application.

The AESend function requires that you specify whether your application should
wait for a reply from the server. If you specify that you want a reply, the OSA
Event Manager prepares a reply OSA event for your application by passing a
default reply OSA event to the server. The OSA Event Manager returns any
nonzero result code from the server's handler in the keyErrorNumber parameter
of the reply OSA event. The server can return an error string in the
keyErrorString parameter of the reply OSA event. The server can also use the
reply OSA event to return any data you requested-for example, the results of a
numeric calculation or a list of misspelled words.

You specify how your application should wait for a reply by using one of these
flags in the sendMode parameter of the AESend function:

 Flag                Description

 kAENoReply          Your application does not want a reply OSA event.

 kAEQueueReply       Your application wants a reply OSA event; the reply
                     appears in your event queue as soon as the server has the
                     opportunity to process and respond to your OSA event.

 kAEWaitReply        Your application wants a reply OSA event and is willing to
                     wait for it. When using the kAEWaitReply flag, your
                     application must create a separate thread for the AESend
                     function call. This will allow the main thread to service
                     other incoming events sent to the object window's PM
                     message queue.

 Important:  If the kAEWaitReply flag is specified, the application must wait
 for the reply in a separate thread. This allows the main thread to service the
 PM message queue.

 If the kAENoReply flag is specified, the reply OSA event prepared by the OSA
 Event Manager for the server application consists of a null descriptor record.

 After you send an OSA event, your application is responsible for disposing of
 the OSA event record-and thereby deallocating the memory its data uses-by
 calling the AEDisposeDesc function. If you create one descriptor record and
 add it to another, the OSA Event Manager adds a copy of the newly created one
 to the existing one and also makes a copy of the associated data. For example,
 you might use the AECreateDesc function to create a descriptor record that you
 wish to add to an OSA event. When you use the AEPutParamDesc function, it adds
 a copy of your newly created descriptor record, including its data, as a
 parameter to an existing OSA event. When you no longer need the original
 descriptor record, you should call AEDisposeDesc to dispose of it.

 Your application should dispose of all the descriptor records that are created
 for the purposes of adding parameters and attributes to an OSA event. You
 normally dispose of your OSA event and its reply after you receive a result
 from the AESend function. You should dispose of these even if AESend returns
 an error result.

 If you specify the kAEWaitReply flag, the reply OSA event is returned in a
 parameter you pass to the AESend function. If you specify the kAEQueueReply
 flag to the AESend function, the reply OSA event is returned in the PM message
 queue. In this case, the reply is identified by the event class
 kCoreEventClass and the event ID kAEAnswer. Your application processes reply
 events in its event queue in the same way that server applications process OSA
 events.

 Your application should check for the existence of the keyErrorNumber
 parameter of the reply OSA event to ensure that the server performed the
 requested action. The server can also return, in the keyErrorString parameter,
 any error messages you need to display to the user.

 Whenever a server application provides an error string, it should also provide
 an error number. However, you cannot count on all server applications to do
 so. The absence of the keyErrorNumber parameter does not necessarily mean that
 there will not an error string provided in the keyErrorString parameter. A
 client application should therefore check for both the keyErrorNumber and
 keyErrorString parameters before assuming that no error has occurred. If a
 string has been provided without an error number, an error has occurred.

 After extracting the information it needs from the reply event, your handler
 should dispose of the reply by calling the AEDisposeDesc function. Similarly,
 when your handler no longer needs descriptor records it has extracted from the
 reply, it should call AEDisposeDesc to dispose of them.

 The next section provides an overview of the way a source application
 identifies OSA event objects supported by a target application. If you are
 starting by supporting only the Required suite, you can skip the next section
 and go directly to About the OSA Event Manager.


ΓòÉΓòÉΓòÉ 4.4. Working with Object Specifier Records ΓòÉΓòÉΓòÉ

Most of the standard OSA events allow the source application to refer, in an
OSA event parameter, to OSA event objects within the target application or its
documents. The OSA Event Manager allows applications to construct and interpret
such references by means of a standard classification system for OSA event
objects. This system, described in detail in the OSA Event Registry: Standard
Suites, is summarized in Classification of OSA Event Objects. A description in
an OSA event parameter that uses this classification system takes the form of
an object specifier record.

An object specifier record is a descriptor record of descriptor type
typeObjectSpecifier that describes the location of one or more OSA event
objects: for example, the table "Summary of Sales" in the document "Sales
Report," or the third row in that table, or the last row of the column
"Totals." With the aid of application-defined functions, the OSA Event Manager
can conduct a step-by-step search according to such instructions in an object
specifier record, locating first the document, then the table, then other
objects, and so on until the requested object has been identified. Object
specifier records can specify many combinations of identifying characteristics
that cannot be specified using one of the simple data types.

This section introduces object specifier records and the organization of their
data. You need to read this section (a) if you plan to support the Core suite
or any of the standard functional-area suites and (b) if you want to make your
application scriptable-that is, capable of responding to scripts written in a
scripting language.

Important:  An object specifier record identifies one or more OSA event objects
among many; it contains a description of each object, not the object itself. An
OSA event object described by an object specifier record exists only in the
server application's document or in the server application itself.

A client application cannot retrieve an OSA event object from a server
application unless the server application can accurately locate it. Thus, to
locate characters of a specific color, a server application must be able to
identify a single character's color; to locate a character in a cell, a server
application must be able to locate both the table and the cell.

A client application can create object specifier records for use as OSA event
parameters. Scripting components can also create object specifier records as
OSA event parameters for the OSA events they generate in the course of
executing a script. A server application that receives an OSA event containing
an object specifier record should resolve the object specifier record-that is,
locate the requested OSA event objects.

To respond to core and functional-area OSA events received by your application,
you must first define a hierarchy of OSA event objects for your application
that you want other applications or scripting languages to be able to describe.
The OSA event objects for your application should be based as closely as
possible on the standard object classes described by the OSA Event Registry:
Standard Suites. After you have decided which of the standard OSA event objects
make sense for your application, you can write functions that locate objects on
the basis of information in an object specifier record. If you want your
application to send specific OSA events to other applications, you must also
write functions that can create object specifier records and add them to OSA
events. Your application does not need to create object specifier records in
order to be scriptable. However, to write functions that can help the OSA Event
Manager resolve object specifier records, you need to know how they are
constructed.

The section Finding OSA Event Objects provides an overview of the way the OSA
Event Manager works with your application-defined functions to locate the OSA
event objects described in an object specifier record. Resolving and Creating
Object Specifier Records describes in detail how to support object specifier
records as a server or client application.


ΓòÉΓòÉΓòÉ 4.4.1. Data Structures within an Object Specifier Record ΓòÉΓòÉΓòÉ

The organization of the data for an object specifier record is nearly identical
to that of the data for an AE record. An object specifier record is a structure
of data type AEDesc whose data handle usually refers to four keyword-specified
descriptor records describing one or more OSA event objects. An AE record is a
structure of data type AERecord whose data handle refers to one or more OSA
event parameters.

The four keyword-specified descriptor records for an object specifier record
provide information about the requested OSA event object or objects.

 Keyword             Description

 keyAEDesiredClass   Four-character code indicating the object class ID

 keyAEContainer      A description of the container for the requested object,
                     usually in the form of another object specifier record

 keyAEKeyForm        Four-character code for the key form, which indicates how
                     to interpret the key data

 keyAEKeyData        Key data, used to distinguish the desired OSA event object
                     from other objects of the same object class in the same
                     container

 For example, the data for an object specifier record identifying a table named
 "Summary of Sales" in a document named "Sales Report" consists of four
 keyword-specified descriptor records that provide the following information:

     The object class ID for a table

     Another object specifier record identifying the document "Sales Report"
      as the container for the table

     A key form constant indicating that the key data contains a name

     Key data that consists of the string "Summary of Sales"

 The object class ID specifies the OSA event object class to which the object
 belongs. An OSA event object class is a category for OSA event objects that
 share specific characteristics (see OSA Events and OSA Event Objects) The
 characteristics of each object class are listed in the OSA Event Registry:
 Standard Suites. For example, the Core suite defines object classes for
 documents, paragraphs, words. and windows. The first keyword-specified
 descriptor record in an object specifier record uses a four-character code or
 a constant to specify the object class ID. The object class for words, for
 example, can be identified by either the object class ID rowc or the constant
 cWord.

 Note:  The object class ID identifies the object class of an OSA event object
 described in an object specifier record, whereas the event class and event ID
 identify an OSA event.

 The container for an OSA event object is usually another OSA event object. For
 example, the container for a document might be a window, and the container for
 characters, delimited items, or a word might be another word, a paragraph, or
 a document. The container is identified by the second keyword-specified
 descriptor record in an object specifier record; usually this is another
 object specifier record. The container can also be specified by a null
 descriptor record, which indicates a default container or a container already
 known to the OSA Event Manager.

 The descriptor record in an object specifier record that identifies an OSA
 event object's container can in turn use another object specifier record to
 identify the container's container, and so on until the OSA event object is
 fully specified. For example, an object specifier record identifying a
 paragraph might specify the paragraph's container with another object
 specifier record that identifies a page. That object specifier record might in
 turn specify the page's container with another object specifier record
 identifying a document. The ability to nest one object specifier record within
 another in this way makes it possible to identify elements such as "the first
 row in the table named 'Summary of Sales' in the document named 'Sales
 Report.'"

 The key form and key data distinguish the desired OSA event object from other
 OSA event objects of the same object class. The key form describes the form
 the key data takes. The third keyword-specified descriptor record in an object
 specifier record usually specifies the key form with one of seven standard
 constants shown in the following table.

  ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
  ΓöéKey Form            ΓöéValue  ΓöéCorresponding Key Data           Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöéformAbsolutePositionΓöéindx   ΓöéAn integer or other constant     Γöé
  Γöé                    Γöé       Γöéindicating the position of one orΓöé
  Γöé                    Γöé       Γöémore elements in relation to the Γöé
  Γöé                    Γöé       Γöébeginning or end of their        Γöé
  Γöé                    Γöé       Γöécontainer                        Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöéformName            Γöéname   ΓöéElement's name                   Γöé
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  ΓöéformPropertyID      Γöéprop   ΓöéProperty ID for an element's     Γöé
  Γöé                    Γöé       Γöéproperty                         Γöé
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  ΓöéformRelativePositionΓöérele   ΓöéA constant that specifies the    Γöé
  Γöé                    Γöé       Γöéelement just before or after the Γöé
  Γöé                    Γöé       Γöécontainer                        Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöéformRange           Γöérang   ΓöéDescriptor records that specify aΓöé
  Γöé                    Γöé       Γöégroup of elements between two    Γöé
  Γöé                    Γöé       Γöéother elements                   Γöé
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  ΓöéformTest            Γöétest   ΓöéDescriptor records that specify aΓöé
  Γöé                    Γöé       Γöétest                             Γöé
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  ΓöéformUniqueID        ΓöéID     ΓöéA value that uniquely identifies Γöé
  Γöé                    Γöé       Γöéan object within its container orΓöé
  Γöé                    Γöé       Γöéacross an application            Γöé
  ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

 A key form of formPropertyID indicates key data that specifies a property. A
 property of an OSA event object is a specific characteristic of that object
 that can be identified by a constant. The properties associated with the
 object class for documents include the name of the document and a flag
 indicating whether the document has been modified since the last save. The
 properties associated with the object class for words include color, font,
 point size, and style.

 The following figure shows the structure of a typical object specifier record:
 four keyword-specified descriptor records that specify the class ID, the
 container, the key form, and the key data. These four keyword-specified
 descriptor records are the data for a descriptor record (AEDesc) of descriptor
 type typeObjectSpecifier. Note the similarities between the object specifier
 record shown in the following figure and the OSA event record shown in the
 second figure in section Descriptor Lists. Like an OSA event record or an AE
 record, an object specifier record consists of a list of keyword-specified
 descriptor records.

 The following figure shows the structure of a simple object specifier record
 that specifies the key form formPropertyID, formName, or formAbsolutePosition.
 For detailed information about the structure of object specifier records that
 specify the other key forms, see the section Resolving and Creating Object
 Specifier Records.

 The following figure shows the object specifier record for the Get Data event
 previously illustrated in the second figure in section Interpreting OSA Event
 Attributes and Parameters. The object class ID tells the WaveWriter
 application that the requested data is an element of class cTable. The
 container for the table is the document "Sales Report." The key form is
 formName, which tells the server application that the key data identifies the
 OSA event object by name. The key data is the name of the table.

 To add an object specifier record to an OSA event as one of its parameters,
 your application must first create the object specifier record. The section
 Creating Object Specifier Records describes the OSA Event Manager routines for
 creating object specifier records.

 To respond to OSA events that include object specifier records, your
 application should use the standard classification system for OSA event
 objects and provide functions that can locate those objects within your
 application or its documents. The next section summarizes the classification
 of OSA event objects as defined in the OSA Event Registry: Standard Suites.


ΓòÉΓòÉΓòÉ 4.4.2. Classification of OSA Event Objects ΓòÉΓòÉΓòÉ

To create or resolve object specifier records, your application should use the
classification of OSA event objects defined by the OSA Event Registry: Standard
Suites. This section summarizes the concepts that underlie that classification
system. You should have a copy of the OSA Event Registry: Standard Suites
available for reference purposes while you read this section.

You do not need to write your application in an object-oriented programming
language in order to support OSA event objects in your application. However,
you must understand the classification system described in this section in
order to classify OSA event objects in your application and to write routines
that can locate them on the basis of information contained in object specifier
records.


ΓòÉΓòÉΓòÉ 4.4.2.1. Object Classes ΓòÉΓòÉΓòÉ

Except for the concept of inheritance, OSA event objects are different from the
objects used in object-oriented programming languages. OSA event objects are
distinct items in a server application or any of its documents that can be
specified by an object specifier record in an OSA event sent by a client
application. OSA event objects are often, but not always, items that a user can
differentiate and manipulate within an application, such as words, paragraphs,
shapes, windows, or style formats. Every OSA event object can be classified
according to its object class, which defines both its characteristics and its
behavior. The object classes listed in the OSA Event Registry: Standard Suites
provide a method of describing OSA event objects that all applications can
understand. Object classes permit more flexibility than simple descriptor
types; for example, a word can be defined as a simple string, or it can be
defined as an OSA event object with specific characteristics such as font or
style.

Note:  The definition of an object class only specifies conventions that
determine how applications should handle OSA event objects that belong to that
class. Your application must make sure that it uses the conventions correctly;
they are not enforced by the OSA Event Manager.

Each object class is identified by a four-character object class ID, which can
also be represented by a constant. Constants for object classes always begin
with the letter c.

The definition of an object class specifies its superclass, which is the object
class from which a subclass (the class being defined) inherits some of its
characteristics. Characteristics can also be inherited from special object
classes, called abstract superclasses, that are used only in definitions of
object classes and do not refer to real OSA event objects. The pattern of
inheritance among object classes is called the object class inheritance
hierarchy. The following figure shows a portion of this hierarchy. The abstract
superclass cObject is at the top of the hierarchy and is therefore the only
object class that has no superclass. At the next level are cText, which is a
regular object class, and cOpenableObject, which is an abstract superclass.
Both are subclasses of cObject and superclasses for their own subclasses. The
object classes cWord, cItem, and cChar are all subclasses of cText. Similarly,
cWindow, cDocument, and cFile are subclasses of cOpenableObject. Every object
class inherits all the characteristics of its superclass and can also add
characteristics of its own.

The following table shows some of the object classes defined for the Core
suite.

ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
ΓöéClass               ΓöéClass  ΓöéDescription                      Γöé
Γöé                    ΓöéID     Γöé                                 Γöé
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ΓöécChar               Γöécha    ΓöéText characters                  Γöé
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ΓöécDocument           Γöédocu   Γöé OS/2 documents                  Γöé
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ΓöécFile               Γöécfil   ΓöéOS/2 files                       Γöé
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ΓöécSelection          Γöécsel   ΓöéUser or application selections   Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöécText               Γöéctxt   ΓöéSeries of characters             Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöécWindow             Γöécwin   ΓöéStandard OS/2 windows            Γöé
ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

The following table shows some of the object classes defined for the Text
suite.

ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
ΓöéClass               ΓöéClass  ΓöéDescription                      Γöé
Γöé                    ΓöéID     Γöé                                 Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöécChar               Γöécha    ΓöéText characters                  Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöécLine               Γöéclin   ΓöéLines of text                    Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöécParagraph          Γöécpar   ΓöéParagraphs                       Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöécText               Γöéctxt   ΓöéSeries of characters             Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöécTextFlow           Γöécflo   ΓöéText flows                       Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöécWord               Γöécwor   ΓöéWords                            Γöé
ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

As you can see, some object classes, such as cChar and cText, are defined in
more than one suite. For example, the definition of the cText object class in
the Text suite is an extension of the cText object class defined in the Core
suite; it duplicates all the characteristics of the Core suite object class and
adds some of its own. Like a word in a dictionary, one object class ID can have
several related definitions. You can choose to support the definition that best
suits your application; or, if necessary, you can create extensions of your
own. The extension of an object class is different from inheritance between
object classes. An extension of a standard object class provides additional
ways of describing an OSA event object of that class, whereas the object class
inheritance hierarchy determines the pattern of characteristics shared by
different object classes.

The definition of an object class always specifies a default descriptor type.
Suppose, for example, that a client application sends a Get Data, Cut, or Copy
event that specifies an OSA event object but does not specify a descriptor type
for the returned data. In this case, the server application returns a
descriptor record of the default descriptor type for the object class of the
specified OSA event object. For example, the default descriptor type for OSA
event objects of class cWord is typeOS2Text, a descriptor type that specifies
an undelimited string of characters and the code page. The client application
can also request that the data be returned in a descriptor record of some other
data type.

The definition of an object class includes three lists of characteristics:
properties, element classes, and OSA events that support the object class. (The
next section describes properties and element classes.) Any or all of these
characteristics may be inherited from a superclass. An OSA event is listed for
an object class if its parameters can specify objects of that class. The
definition for cWindow, for example, lists 12 OSA events, including the Open,
Close, and Move events, whose parameters can include object specifier records
that specify windows. The cWindow class inherits all of these OSA events from
its abstract superclass, cOpenableObject.

The OSA Event Registry: Standard Suites also defines primitive object classes,
which describe OSA event objects that contain a single value. For example, the
cBoolean, and cLongInteger object classes are all primitive object classes. The
object class ID for a primitive object class is the same as the four-character
value of its descriptor type. Primitive object classes contain no properties;
they contain only the value of the data.


ΓòÉΓòÉΓòÉ 4.4.2.2. Properties and Elements ΓòÉΓòÉΓòÉ

The properties listed for an object class can be used to identify
characteristics of OSA event objects that belong to that class. Each property
is identified by a four-character property ID, which can also be represented by
a constant. Constants for properties always begin with the letter p.

The following table shows the constants and property IDs for some properties.

ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
ΓöéProperty            ΓöéPropertyΓöéDescription                      Γöé
Γöé                    ΓöéID      Γöé                                 Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöépBounds             Γöépbnd    ΓöéCoordinates of a window          Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöépClass              Γöépcls    ΓöéClass ID of an OSA event object  Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöépColor              Γöécolr    ΓöéText color                       Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöépFillColor          Γöéflcl    ΓöéFill color                       Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöépFont               Γöéfont    ΓöéFont                             Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöépIsModal            Γöépmod    ΓöéIndicates whether a window is    Γöé
Γöé                    Γöé        Γöémodal                            Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöépName               Γöépnam    ΓöéName of an OSA event object      Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöépTextPointSize      Γöéptps    ΓöéPoint size                       Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöépTextStyle          Γöétxst    ΓöéText style                       Γöé
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The property of an OSA event object is itself defined as a single OSA event
object whose container is the object to which the property belongs. For
example, the pFont property of a word is defined by the name of a font, such as
Helvetica the string that identifies the font is an OSA event object of class
cText.

The constant cProperty specifies the object class for any object specifier
record that identifies a property.


#define cProperty   0x706F7270   /* 'prop' */

An object specifier record for a property specifies cProperty as the object
class ID, the OSA event object to which the property belongs as the container,
formPropertyID as the key form, and a constant such as pFont as the key data.

The elements of a specific OSA event object are the other OSA event objects it
contains, excluding those that define its properties. An object specifier
record for an element specifies the OSA event object in which the element is
located as the container and can specify any key form except formPropertyID.
Each object class definition in the OSA Event Registry: Standard Suites
includes a list of element classes, which are the object classes of the
elements that an OSA event object can contain.

An OSA event object contains exactly one of each of its properties, whereas it
can contain no elements or many elements of the same element class. In general,
a property of an object describes something about that object; a property can
be examined or changed but never deleted. An element can be one or more
discrete objects contained in another object and can usually be deleted.

For example, because a paragraph can contain one or more words, one of the
element classes listed for the object class cParagraph is the object class
cWord. Individual words can be deleted from a paragraph. However, even though a
word in a paragraph can be in a different font from the words around it, a
paragraph can have only one pFont property. This property is defined as the
font of the first character in the paragraph and consists of the name of a
font. The paragraph's pFont property can be changed but not removed.

The properties and element classes listed for each object class definition in
the OSA Event Registry: Standard Suites can be inherited from a superclass, or
they can originate with a subclass. The following figure illustrates the object
class inheritance hierarchy for the object class cWindow in the Core suite.
Boldface terms in the figure represent those properties, element classes, or
OSA events that are not inherited. The object class cWindow includes all the
properties and OSA events of its superclass, cOpenableObject, which in turn
includes all the properties and OSA events of its superclass, cObject. The
object class cWindow also includes 11 properties and one element class that
originate with cWindow and are not inherited.

The pClass property-the property that specifies the four-character class
ID-originates with cObject. Because the definitions of all object classes are
ultimately derived from cObject, pClass is inherited by all object classes. The
definition for cObject also lists ten OSA events, which include common events
such as Get Data, Move, and Delete Element. Because cObject is at the top of
the object class inheritance hierarchy, these ten OSA events can use object
specifier records that describe OSA event objects of any object class as a
direct parameter. Like all abstract superclasses, cObject does not correspond
to a real OSA event object, so its definition does not list any element
classes. Unlike any other object class, cObject is at the top of the object
class inheritance hierarchy and therefore does not have a superclass.

The chain of containers that determine the location of one or more OSA event
objects is called the container hierarchy. The container hierarchy, which
specifies the location of real OSA event objects, is different from the object
class inheritance hierarchy, which is an abstract concept that determines which
properties, element classes, and OSA events an object class inherits from its
superclass. For example, the container hierarchy for an OSA event object of
class cWord can vary from one word to another, because various combinations of
other OSA event objects, such as a document, a paragraph, a delimited string,
or another word, can contain a word.

Applications that support OSA event objects must be able to identify the order
of several elements of the same class that are contained within another OSA
event object. For example, each word in a paragraph should have an identifiable
order, such as the 5th word or the 12th word. This allows other applications to
identify OSA event objects by describing their absolute position within a
container.

The following figure shows an OSA event object of object class cWord-the word
"Sales"-contained in another OSA event object of object class cParagraph. (Both
these object classes are defined in the Text suite.) The figure shows only a
portion of the container hierarchy for the word, since a complete description
of the word would also include the containers that specify the location of the
paragraph.

Your application must take account of the definitions in the OSA Event
Registry: Standard Suites for any object classes you want to support. For
example, the definition for the object class cText lists paragraphs, lines,
words, and characters as OSA event objects that can be contained in OSA event
objects of class cText. To support OSA events that refer to elements of object
class cText, your application should associate the cText object class with
paragraphs, lines, words, and characters in its documents. The list of
properties defined for class cText includes the properties pColor, pFont,
pPointSize, pCodePage, and pTextStyles. If you want to support OSA events that
distinguish a boldface 12-point word of object class cText from an italic
14-point word, for example, your application must associate the point size and
style of text in its documents with the properties pPointSize and pTextStyles
defined for class cText.


ΓòÉΓòÉΓòÉ 4.4.3. Finding OSA Event Objects ΓòÉΓòÉΓòÉ

Most of the OSA events in the Core suite and the functional-area suites defined
in the OSA Event Registry: Standard Suites can include parameters that consist
of object specifier records. Your application's handlers for these events can
use the AEResolve function to resolve object specifier records: that is, to
locate the OSA event objects they describe.

The AEResolve function parses an object specifier record and performs related
tasks that are the same for all object specifier records. When necessary, the
AEResolve function calls application-defined functions to perform tasks that
are unique to the application, such as locating a specific OSA event object in
the application's data structures.

Your application can provide two kinds of application-defined functions for use
by AEResolve. Object accessor functions locate OSA event objects. Every
application that supports simple object specifier records must provide one or
more object accessor functions. Object callback functions perform other tasks
that only an application can perform, such as counting, comparing, or marking
OSA event objects.

Each time AEResolve calls one of your application's object accessor functions
successfully, the object accessor function returns a special descriptor record,
called a token, that identifies either an element in a specified container or a
property of a specified OSA event object. The token can be of any descriptor
type, including descriptor types you define yourself.

You install object accessor functions by using the AEInstallObjectAccessor
function. Much like the AEInstallEventHandler function, AEInstallObjectAccessor
uses an object accessor dispatch table to map requests for OSA event objects to
the appropriate object accessor functions in your application. These requests
refer to objects of a specified object class in containers identified by a
token of a specified descriptor type.

Responding to an OSA event that includes an object specifier record typically
involves these steps:

   1. After determining that the event is an OSA event, your application calls
      AEProcessOSAEvent.

   2. The AEProcessOSAEvent function uses the OSA event dispatch table to
      dispatch the event to the your application's handler for that event.

   3. The OSA event handler extracts the OSA event parameters, and passes the
      object specifier records they contain to AEResolve.

   4. The AEResolve function uses the object accessor dispatch table to call
      one or more object accessor functions, one at a time, that can identify
      the nested OSA event objects described by each object specifier record.
      Each object accessor function returns a token for the object it finds,
      which in turn helps to determine which object accessor function the
      AEResolve function will use to locate the next OSA event object.

   5. The AEResolve function returns the final token for the requested object
      to the application's handler.

 The resolution of an object specifier record always begins with the outermost
 container it specifies. For example, to locate a table named "Summary of
 Sales" in the document named "Sales Report," the AEResolve function first
 calls an object accessor function that can locate the document, then uses the
 token returned by that function to identify an object accessor function that
 can locate the table. It then returns the token for the table to the OSA event
 handler that called AEResolve.

 Resolving and Creating Object Specifier Records describes in detail how to
 resolve object specifier records and how to write and install object accessor
 and object callback functions.


ΓòÉΓòÉΓòÉ 4.5. About the OSA Event Manager ΓòÉΓòÉΓòÉ

You can use the OSA Event Manager to do the following:

     Respond to OSA events as a server application
     Create and send OSA events as a client application
     Resolve and create object specifier records
     Support OSA event recording

 This section briefly summarizes the steps involved in providing each kind of
 support and tells where to find the relevant information in this book.


ΓòÉΓòÉΓòÉ 4.5.1. Supporting OSA Events as a Server Application ΓòÉΓòÉΓòÉ

You do not need to implement all OSA events at once. You can begin by
supporting just the required events. The beginning of the section Handling OSA
Events describes how to provide this minimal level of support.

It is relatively easy to respond to the required events. If, however, your
application cannot respond to any other OSA events, other applications will not
be able to request services that involve locating specific OSA event objects
within your application or its documents, and users will not be able to control
your application by executing scripts. To respond to OSA events it is likely to
receive from other applications or from scripting components, your application
must be able to respond to the appropriate core and functional-area OSA events.

Once you have provided the basic level of support for the required suite, you
should:

     Decide which other OSA event suites you want to support

     Define the hierarchy of OSA event objects within your application that
      you want scripting components or other applications to be able to
      identify-that is, which OSA event objects can be contained by other OSA
      event objects in your application

     Write handlers for the OSA events you support, and install corresponding
      entries in your application's OSA event dispatch table

 To decide which OSA event suites you want to support and how to define the
 hierarchy of OSA event objects in your application, consult the OSA Event
 Registry: Standard Suites and evaluate which OSA events and OSA event object
 classes make sense for your application. If necessary, you can extend the
 definitions of the standard OSA events and OSA events objects to cover special
 requirements of your application. It is better to extend the standard
 definitions rather than to define your own custom OSA events, because only
 those applications that choose to support your custom OSA events explicitly
 will be able to make use of them.

 Responding to OSA Events describes how to write OSA event handlers and related
 routines. Resolving and Creating Object Specifier Records describes how to
 resolve object specifiers in an OSA event that describes OSA event objects in
 your application or its documents.

 If your application can respond to OSA events, you can make it scriptable
 simply by adding an aete resource. Scripting components use your application's
 aete resource to obtain information about the OSA events and corresponding
 human-language terminology that your application supports. OSA Event
 Terminology Resources describes how to optimize your implementation of OSA
 events for use by scripting components and how to create an aete resource.


ΓòÉΓòÉΓòÉ 4.5.2. Supporting OSA Events as a Client Application ΓòÉΓòÉΓòÉ

Because users can send OSA events to a variety of applications simply by
executing a script, many applications have no need to send OSA events. However,
if you want to factor your application for recording, or if you want your
application to send OSA events directly to other applications, you can use OSA
Event Manager routines to create and send OSA events.

To send an OSA event, you must:

     Create the OSA event
     Add parameters and attributes
     Use the AESend function to send the event

 Creating and Sending OSA Events describes how to perform these tasks.


ΓòÉΓòÉΓòÉ 4.5.3. Supporting OSA Event Objects ΓòÉΓòÉΓòÉ

If your application responds to core and functional-area OSA events, it must
also be able to resolve object specifier records that describe the objects on
which those OSA events can act. In addition to the tasks described in
Responding to OSA Events, you must perform the following tasks to handle OSA
events that contain object specifier records:

     Write object accessor functions that can locate the OSA event objects you
      support, and install corresponding entries in your application's object
      accessor dispatch table.

     Write any object callback functions that you decide to provide. To handle
      object specifier records that specify a test, your application must
      provide at least two object callback functions: one that counts objects
      and one that compares them.

     Call AEResolve from your OSA event handlers whenever an OSA event
      parameter includes an object specifier record.

 Resolving and Creating Object Specifier Records describes how to perform these
 tasks. It also describes how applications that send OSA events to themselves
 or directly to other applications can create object specifier records.


ΓòÉΓòÉΓòÉ 4.5.4. Supporting OSA Event Recording ΓòÉΓòÉΓòÉ

If you make your application scriptable, you may also want to make it
recordable. Users of recordable applications can record their actions in the
form of OSA events that a scripting component translates into a script. When a
user executes a recorded script, the scripting component sends the same OSA
events to the application in which they were recorded.

To make your application recordable, you should use OSA events to report user
actions to the OSA Event Manager in terms of OSA events. One way to do this is
to separate the code that implements your application's user interface from the
code that actually performs work when the user manipulates the interface. This
is called factoring your application. A factored application acts as both the
client and server application for OSA events it sends to itself in response to
user actions. When recording is turned on, the OSA Event Manager sends a copy
of every event than an application sends to itself to the scripting component
or other process that turned recording on.

Introduction to Scripting provides an overview of how to make your application
both scriptable and recordable. Recording OSA Events describes how to factor
your application for recording and explains the OSA Event Manager's recording
mechanism.


ΓòÉΓòÉΓòÉ 5. Responding to OSA Events ΓòÉΓòÉΓòÉ

This chapter describes how your application can use the OSA Event Manager to
respond to OSA events. Your application must be able to respond to the four
required OSA events. To be scriptable, or capable of responding to OSA events
sent by scripting components, your application should handle the appropriate
core and functional-area OSA events.

Before you read this chapter, you should be familiar with Interapplication
Communication and OSA Events. You should also have a copy of the OSA Event
Registry: Standard Suites available for reference.

This chapter provides the basic information you need to make your application
capable of responding to OSA events. To respond to core and functional-area OSA
events, your application must also be able to resolve object specifier records.
You should read Resolving and Creating Object Specifier Records before you
write OSA event handlers for events that can contain object specifier records.

The section Handling OSA Events describes how to:

     Accept and process OSA events
     Install entries in the OSA event dispatch tables
     Handle the required events
     Get data out of an OSA event
     Write handlers that perform the action requested by an OSA event
     Reply to an OSA event
     Dispose of OSA event data structures
     Write and install coercion handlers


ΓòÉΓòÉΓòÉ 5.1. Handling OSA Events ΓòÉΓòÉΓòÉ

You do not need to implement all OSA events at once. If you want to begin by
supporting only the required OSA events, you must:

     Include code to handle OSA events in a window procedure.
     Write routines that handle the required events
     Install entries for the required OSA events in your application's OSA
      event dispatch table

 The following sections explain how to perform these tasks: Accepting an OSA
 Event and Installing Entries in the OSA Event Dispatch Tables.

 To respond to core and functional-area OSA events, you must install entries
 and write handlers for those events. You must also make sure that your
 application can locate OSA event objects with the aid of the OSA Event Manager
 routines described in Resolving and Creating Object Specifier Records. These
 routines are currently available as the Object Support Library (OSL).


ΓòÉΓòÉΓòÉ 5.1.1. Accepting an OSA Event ΓòÉΓòÉΓòÉ

To accept or send OSA events, code must be included to handle OSA events in
your application's main event loop.

The following code fragment is an example of a PM window procedure. This
procedure receives the OSA event in the semantic event record specified in the
mp1 (message parameter 1). This procedure calls AEProcessOSAEvent function and
passes the semantic event record found in mp1. The AEProcessOSAEvent function
determines the type of OSA event received and calls the corresponding OSA event
handler in your application.

MRESULT EXPENTRY MyObjectWindowProc(HWND hwnd, ULONG msg, MPARAM mp1, MPARAM mp2)
{
  OSErr  rc = noErr;

  switch (msg)
  {
   case WM_SEMANTICEVENT:
     /* The pointer to the SemanticEvent is in mp1 */
     rc =  AEProcessOSAEvent((SemanticEvent *)mp1);
     return ((MRESULT) rc);
   default:
     return (WinDefWindowProc(hwnd, msg, mp1, mp2));
     break;

  }    /* End of Switch */
}      /* End of WinProc */

You should provide an OSA event handler for each OSA event that your
application supports. This handler is responsible for performing the action
requested by the OSA event and if necessary can return data in the reply OSA
event.

If the client application requests a reply, the OSA Event Manager passes a
default reply OSA event to your handler. If the client application does not
request a reply, the OSA Event Manager passes a null descriptor record (a
descriptor record of descriptor type typeNull and a data handle whose value is
NULL) to your handler instead of a default reply OSA event.

After your handler finishes processing the OSA event and adds any parameters to
the reply OSA event, it must return a result code to AEProcessOSAEvent. If the
client application is waiting for a reply, the OSA event Manager returns the
reply OSA event to the client.


ΓòÉΓòÉΓòÉ 5.1.2. Installing Entries in the OSA Event Dispatch Tables ΓòÉΓòÉΓòÉ

When your application receives a WM_SEMANTICEVENT message, the
AEProcessOSAEvent function, with message parameter 1 of the WM_SEMANTICEVENT
from=textonly message, is used to retrieve the OSA event. This function also
routes the OSA event to the appropriate event handler. The application supplies
an OSA event dispatch table to map the OSA events supported by the application
to the OSA event handlers provided by the application.

To install entries in your application's OSA event dispatch table, use the
AEInstallEventHandler function. You usually install entries for all of the OSA
events that your application accepts into your application's OSA event dispatch
table.

To install an OSA event handler in your OSA event dispatch table, you must
specify the following:

     Event class of the OSA event
     Event ID of the OSA event
     Address of the OSA event handler for the OSA event
     Reference constant

 You provide this information to the AEInstallEventHandler function. In
 addition, you indicate whether the entry should be added to your application's
 OSA event dispatch table or to the system OSA event dispatch table.

 The system OSA event dispatch table contains system OSA event
 handlers-handlers that are available to all applications and processes running
 on the same computer. The handlers in your application's OSA event dispatch
 table are available only to your application. If AEProcessOSAEvent cannot find
 a handler for the OSA event in your application's OSA event dispatch table, it
 looks in the system OSA event dispatch table for a handler (see Dispatching
 OSA Event for details). If it does not find a handler for the event, it
 returns the errAEEventNotHandled result code.

 If you add a handler to the system OSA event dispatch table, the handler
 should reside in a DLL. If there was already an entry in the system OSA event
 dispatch table for the same event class and event ID, it is replaced unless
 you chain it to your system handler. See Creating and Managing the OSA Event
 Dispatch Tables for details.


ΓòÉΓòÉΓòÉ 5.1.2.1. Installing Entries for the Required OSA Events ΓòÉΓòÉΓòÉ

The following code fragment illustrates how to add entries for the required OSA
events to your application's OSA event dispatch table.

myErr = AEInstallEventHandler(kCoreEventClass, kAEOpenApplication,
               MyHandleOApp, 0, FALSE);
if (myErr != noErr) DoError(myErr);

myErr = AEInstallEventHandler(kCoreEventClass, kAEOpenDocuments,
               MyHandleODoc,0, FALSE);
if (myErr != noErr) DoError(myErr);

myErr = AEInstallEventHandler(kCoreEventClass, kAEPrintDocuments,
               MyHandlePDoc, 0, FALSE);
if (myErr != noErr) DoError(myErr);

myErr = AEInstallEventHandler(kCoreEventClass, kAEQuitApplication,
               MyHandleQuit, 0, FALSE);
if (myErr != noErr) DoError(myErr);

return (myErr);

The previous code fragment creates entries for all four required OSA events in
the OSA event dispatch table. The first entry creates an entry for the Open
Application event. The entry indicates the event class and event ID of the Open
Application event, supplies the address of the handler for that event, and
specifies 0 as the reference constant.

The OSA Event Manager passes the reference constant to your handler each time
your handler is called. Your application can use this reference constant for
any purpose. If your application does not use the reference constant, use 0 as
the value.

The isSysHandler parameter to the AEInstallEventHandler function is a Boolean
value that determines whether the entry is added to the system OSA event
dispatch table or to your application's OSA event dispatch table. To add the
entry to your application's OSA event dispatch table, use FALSE as the value of
this parameter. If you specify TRUE, the entry is added to the system OSA event
dispatch table. The previous code fragment adds entries to the application's
OSA event dispatch table.


ΓòÉΓòÉΓòÉ 5.1.2.2. Dispatching OSA Event ΓòÉΓòÉΓòÉ

In addition to the OSA event handler dispatch tables, applications can add
entries to a special handler dispatch table for application or system-wide
usage. These dispatch tables are used for various specialized handlers; for
more information, see Creating and Managing the Special Handler Dispatch
Tables.

When an application calls AEProcessOSAEvent, the function looks first in the
application's special handler dispatch table for an entry that was installed
with the constant keyPreDispatch. If the application's special handler dispatch
table does not include such a handler or if the handler returns
errAEEventNotHandled, the function looks in the application's OSA event
dispatch table for an entry that matches the event class and event ID of the
specified OSA event.

If the application's OSA event dispatch table does not include such a handler
or if the handler returns errAEEventNotHandled, the AEProcessOSAEvent function
looks in the system special handler dispatch table for an entry that was
installed with the constant keyPreDispatch. If the system special handler
dispatch table does not include such a handler or if the handler returns
errAEEventNotHandled, the function looks in the system OSA event dispatch table
for an entry that matches the event class and event ID of the specified OSA
event.

If the system OSA event dispatch table does not include such a handler, the OSA
Event Manager returns the result code errAEEventNotHandled to the server
application and, if the client application is waiting for a reply, to the
client application.

For any entry in your OSA event dispatch table, you can specify a wildcard
value for the event class, event ID, or both. You specify a wildcard by
supplying the typeWildCard constant when installing an entry into the OSA event
dispatch table. A wildcard value matches all possible values. Wildcards make it
possible to supply one OSA event handler that dispatches several related OSA
events.

For example, if you specify an entry with the typeWildCard event class and the
kAEOpenDocuments event ID, the OSA Event Manager dispatches OSA events of any
event class with an event ID of kAEOpenDocuments to the handler for that entry.

If you specify an entry with the kCoreEventClass event class and the
typeWildCard event ID, the OSA Event Manager dispatches OSA events of the
kCoreEventClass event class with any event ID to the handler for that entry.

If you specify an entry with the typeWildCard event class and the typeWildCard
event ID, the OSA Event Manager dispatches all OSA events of any event class
and any event ID to the handler for that entry.

If an OSA event dispatch table contains one entry for an event class and a
specific event ID, and also contains another entry that is identical except
that it specifies a wildcard value for either the event class or the event ID,
the OSA Event Manager dispatches the more specific entry. For example, if an
OSA event dispatch table includes one entry that specifies the event class as
kAECoreSuite and the event ID as kAEDelete, and another entry that specifies
the event class as kAECoreSuite and the event ID as typeWildCard, the OSA Event
Manager will dispatch the OSA event handler associated with the entry that
specifies the event ID as kAEDelete.

Important:  If your application sends OSA events to itself using a typePID
address descriptor record set to kCurrentProcess, the OSA Event Manager jumps
directly to the appropriate OSA event handler without going through the normal
event-processing sequence. This improves the performance of your application
when sending events to yourself. For more information, see Addressing an OSA
Event for Direct Dispatching.


ΓòÉΓòÉΓòÉ 5.1.2.3. Required OSA Events ΓòÉΓòÉΓòÉ

If your application accepts OSA events, it must be able to process the four
required OSA events.

Upon receiving any of the required OSA events, your application should perform
the action requested by the event. Here is a summary of the contents of the
required events and the actions they request applications to perform:

Open Application-perform tasks associated with opening an application

 Event class            kCoreEventClass

 Event ID               kAEOpenApplication

 Parameters             None

 Requested action       Perform any tasks (such as opening an untitled document
                        window) that you would normally perform when a user
                        opens your application without opening or printing any
                        documents.

 Open Documents-open the specified documents

 Event class            kCoreEventClass

 Event ID               kAEOpenDocuments

 Required parameter

   Keyword:             keyDirectObject

   Descriptor type:     typeAEList

   Data:                A list of file names for the documents to be opened

 Requested action       Open the documents specified in the keyDirectObject
                        parameter.

 Print Documents-print the specified documents

 Event class            kCoreEventClass

 Event ID               kAEPrintDocuments

 Required parameter

   Keyword:             keyDirectObject

   Descriptor type:     typeAEList

   Data:                A list of file names for the documents to be printed

 Requested action       Print the documents specified in the keyDirectObject
                        parameter without opening windows for the documents.

 Quit Application-perform tasks associated with quitting

 Event class            kCoreEventClass

 Event ID               kAEQuitApplication

 Parameters             None

 Requested action       Perform any tasks that your application would normally
                        perform when the user chooses Quit. Such tasks
                        typically include asking the user whether to save
                        documents that have been changed.

 Your application needs to recognize only two descriptor types to handle the
 required OSA events: descriptor lists and file names. The Open Documents event
 and Print Documents event use descriptor lists to store a list of documents to
 open. Each document is specified as a file name in the descriptor list.


ΓòÉΓòÉΓòÉ 5.1.2.4. Handling the Open Application Event ΓòÉΓòÉΓòÉ

On startup, your application typically performs any needed initialization, and
then begins to process events. To handle the Open Application event, your
application should do just what the user expects it to do when it is opened.
For example, your application might open a new untitled window in response to
an Open Application event.

The following code fragment shows a handler that processes the Open Application
event. This handler first calls an application-defined function called
MyGotRequiredParams, which checks whether the OSA event contains any required
parameters. If so, the handler returns an error, because by definition, the
Open Application event should not contain any required parameters. Otherwise,
the handler opens a new document window.

OSErr MyHandleOApp(OSAEvent theOSAEvent, OSAEvent reply, long handlerRefcon)
{
  OSErr myErr;

  myErr = MyGotRequiredParams(theOSAEvent);
  if (myErr == noErr)
   DoNew;
  return (myErr);
}

For a description of the MyGotRequiredParams function, see the code fragment in
section Writing OSA Event Handlers. For information about the reply and
handlerRefcon parameters for an OSA event handler, see Writing OSA Event
Handlers.


ΓòÉΓòÉΓòÉ 5.1.2.5. Handling the Open Documents Event ΓòÉΓòÉΓòÉ

To handle the Open Documents event, your application should open the documents
that the Open Documents event specifies in its direct parameter. Your
application extracts this information and then opens the specified documents.
The following code fragment shows a handler for the Open Documents event.

OSErr MyHandleODoc (OSAEvent theOSAEvent, OSAEvent reply, long handlerRefcon)
{
  char     myFileName;
  AEDescList  docList;
  OSErr    myErr, ignoreErr;
  long     index, itemsInList;
  Size     actualSize;
  AEKeyword  keywd;
  DescType   returnedType, typeOS2FileName;

    /* get the direct parameter--a descriptor list--and put it */
    /* into docList */
  myErr = AEGetParamDesc(&theOSAEvent, keyDirectObject, typeAEList, &docList);

  if (myErr == noErr) {
    /*check for missing required parameters*/
    myErr = MyGotRequiredParams(theOSAEvent);
    if (myErr == noErr) {
      /*count the number of descriptor records in the list*/
      myErr = AECountItems (&docList, &itemsInList);
      if (myErr == noErr)
        /*now get each descriptor record from the list, */
        /* coerce the returned data to a character string, and */
        /* open the associated file*/
        for (index=1; index >= itemsInList; ++index) {
          myErr = AEGetNthPtr(&docList, index, typeOS2FileName, &keywd,
                    &returnedType, &myFileName,
                    sizeof(myFileName), &actualSize);
          if (myErr == noErr) {
            myErr = MyOpenFile(&myFileName);
            if (myErr != noErr)
             ;      /* handle error from MyOpenFile */
            else
             ;      /* handle error from AEGetNthPtr */
          }
        }
    }
    else
      ;         /* handle error from MyGotRequiredParams */
    ignoreErr = AEDisposeDesc(&docList);
  }
  else
   ;        /* failed to get direct parameter, handle error */
  return (myErr);
}

The handler in the previous code fragment first uses the AEGetParamDesc
function to get the direct parameter (specified by the keyDirectObject keyword)
out of the OSA event. The handler requests that AEGetParamDesc return a
descriptor list in the docList variable. The handler then checks that it has
retrieved all of the required parameters by calling the MyGotRequiredParams
function. (See the code fragment in section Writing OSA Event Handlers for a
description of this function.)

Once the handler has retrieved the descriptor list from the OSA event, it uses
AECountItems to count the number of descriptors in the list. Using the returned
number as an index, the handler can get the data of each descriptor record in
the list. This handler requests that the AEGetKeyPtr function coerce the data
in the descriptor record to a file name. The handler can then use the file name
as a parameter to its own routine for opening files.

For more information on the AEGetKeyPtr and AECountItems functions, see Getting
Data Out of a Descriptor List.

After extracting the file name that describes the document to open, your
application can use this name to open the file. For example, in the previous
code fragment, the code passes the file name to its routine for opening files,
the MyOpenFile function.

The MyOpenFile function should be designed so that it can be called in response
to both the Open Documents event and to events generated by the user. For
example, when the user chooses Open from the File menu, the code that handles
the mouse-down event uses an Open File dialog to let the user choose a file; it
then calls MyOpenFile, passing the file name record returned by the dialog box.
By isolating code that performs a requested action from code that interacts
with the user, you can easily adapt your application to handle OSA events that
request the same action.

Note the use of the AEDisposeDesc function to dispose of the descriptor list
when your handler no longer requires the data in it. Your handler should also
return a result code.


ΓòÉΓòÉΓòÉ 5.1.2.6. Handling the Print Documents Event ΓòÉΓòÉΓòÉ

To handle the Print Documents event, your application should extract
information about the documents to be printed from the direct parameter, then
print the specified documents.

The handler for the Print Documents event shown in the following code fragment
is similar to the handler for the Open Documents event, except that it prints
the documents referred to in the direct parameter.

OSErr MyHandlePDoc (OSAEvent theOSAEvent, OSAEvent reply, long handlerRefcon)
{
  char     myFileName;
  AEDescList  docList;
  OSErr    myErr, ignoreErr;
  long     index, itemsInList;
  Size     actualSize;
  AEKeyword  keywd;
  DescType   returnedType, typeOS2FileName;

  /* get the direct parameter--a descriptor list--and put it */
  /* into docList */
  myErr = AEGetParamDesc(&theOSAEvent, keyDirectObject, typeAEList, &docList);
  if (myErr == noErr) {
   /*check for missing required parameters*/
   myErr = MyGotRequiredParams(theOSAEvent);
   if (myErr == noErr) {
     /*count the number of descriptor records in the list*/
     myErr = AECountItems (&docList, &itemsInList);
     if (myErr == noErr)
      /*now get each descriptor record from the list, */
      /* coerce the returned data to a character string, and */
      /* print the associated file*/
      for (index=1; index >= itemsInList; ++index) {
        myErr = AEGetNthPtr(&docList, index, typeOS2FileName, &keywd,
                  &returnedType, &myFileName,
                  sizeof(myFileName), &actualSize);
        if (myErr == noErr) {
         myErr = MyPrintFile(&myFileName);
         if (myErr != noErr)
           ;        /* handle error from MyOpenFile  */
        }
        else
         ;          /* handle error from AEGetNthPtr */
      }
   }
   else
     ;           /* handle error from MyGotRequiredParams */
   ignoreErr = AEDisposeDesc(&docList);
  }
  else
   ;         /* failed to get direct parameter, handle error */
  return (myErr);
}


ΓòÉΓòÉΓòÉ 5.1.2.7. Handling the Quit Application Event ΓòÉΓòÉΓòÉ

To handle the Quit Application event, your application should take any actions
that are necessary before it is terminated (such as saving any open documents).
The following code fragment shows an example of a handler for the Quit
Application event.

OSErr MyHandleQuit (OSAEvent theOSAEvent, OSAEvent reply, long handlerRefcon)
{
  OSErr  myErr;
  BOOL  userCanceled;

  /* check for missing required parameters */
  myErr = MyGotRequiredParams(theOSAEvent);
  if (myErr == noErr) {
   userCanceled = MyPrepareToTerminate;
   if (userCanceled)
     MyHandleQuit = kUserCanceled;
   else
     MyHandleQuit = noErr;
  }
  else
   return (myErr);
}

The handler in the previous code fragment calls another function supplied by
the application, the MyPrepareToTerminate function. This function saves the
documents for any open windows and returns a Boolean value that indicates
whether the user canceled the Quit operation. This is another example of
isolating code for interacting with the user from the code that performs the
requested action. By structuring your application in this way, you can use the
same routine to respond to a user action (such as choosing the Quit command
from the File menu) or to the corresponding OSA event. (For a description of
the MyGotRequiredParams function, see Writing OSA Event Handlers.)


ΓòÉΓòÉΓòÉ 5.1.3. Getting Data Out of an OSA Event ΓòÉΓòÉΓòÉ

The OSA Event Manager stores the parameters and attributes of an OSA event in a
format that is internal to the OSA Event Manager. You use OSA Event Manager
functions to retrieve the data from an OSA event and return it to your
application in a format your application can use.

Most of the functions that retrieve data from OSA event parameters and
attributes are available in two forms: one that returns the desired data in a
specified buffer and one that returns a descriptor record containing the same
data. For example, the AEGetParamPtr function uses a specified buffer to return
the data contained in an OSA event parameter, and the AEGetParamDesc function
returns the descriptor record for a specified parameter.

You can also use OSA Event Manager functions to get data out of descriptor
records, descriptor lists, and AE records. You use similar functions to put
data into descriptor records, descriptor lists, and AE records.

When your handler receives an OSA event, you typically use the AEGetParamPtr,
AEGetAttributePtr, AEGetParamDesc, or AEGetAttributeDesc function to get the
data out of the OSA event.

Some OSA Event Manager functions let your application request that the data be
returned using any descriptor type, even if it is different from the original
descriptor type. If the original data is of a different descriptor type, the
OSA Event Manager attempts to coerce the data to the requested descriptor type.

For example, the AEGetParamPtr function lets you specify the desired descriptor
type of the resulting data as follows:


OSAEvent  theOSAEvent;
DescType  returnedType;
LongInt  multResult;
Size    actualSize;
OSErr   myErr;

myErr = AEGetParamPtr(&theOSAEvent, keyMultResult, typeLongInteger,
           &returnedType, &multResult, sizeof(multResult),
           &actualSize);

In this example, the desired type is specified in the third parameter by the
typeLongInteger descriptor type. This requests that the OSA Event Manager
coerce the data to a long integer if it is not already of this type. To prevent
coercion and ensure that the descriptor type of the result is of the same type
as the original, specify typeWildCard for the third parameter.

The OSA Event Manager returns, in the returnedType parameter, the descriptor
type of the resulting data. This is useful information when you specify
typeWildCard as the desired descriptor type; you can determine the descriptor
type of the resulting data by examining this parameter.

The OSA Event Manager can coerce many different types of data. For example, the
OSA Event Manager can convert integers to Boolean data types, and characters to
numeric data types, in addition to other data type conversions. For a complete
list of the data types for which the OSA Event Manager provides coercion
handling, see the table in section Writing and Installing Coercion Handlers.

To perform data coercions that the OSA Event Manager does not perform, you can
provide your own coercion handlers. See Writing and Installing Coercion
Handlers for information on providing your own coercion handlers.

OSA event parameters are keyword-specified descriptor records. You can use
AEGetParamDesc to get the descriptor record of a parameter, or you can use
AEGetParamPtr to get the data out of the descriptor record of a parameter. If
an OSA event parameter consists of an object specifier record, you can use
AEResolve and your own object accessor functions to resolve the object
specifier record-that is, to locate the OSA event object it describes. For more
information about AEResolve and object accessor functions, see Writing Object
Accessor Functions. Attributes are also keyword-specified descriptor records,
and you can use similar routines to get the descriptor record of an attribute
or to get the data out of an attribute.

The following sections show how to use the AEGetParamPtr, AEGetAttributePtr,
AEGetParamDesc, or AEGetAttributeDesc function to get the data out of an OSA
event.


ΓòÉΓòÉΓòÉ 5.1.3.1. Getting Data Out of an OSA Event Parameter ΓòÉΓòÉΓòÉ

You can use the AEGetParamPtr or AEGetParamDesc function to get the data out of
an OSA event parameter. Use the AEGetParamPtr function (or the AEGetKeyPtr
function, which works the same way) to return the data contained in a
parameter. Use the AEGetParamDesc function when you need to get the descriptor
record of a parameter or to extract the descriptor list from a parameter.

For example, suppose you need to get the data out of a Set Data event. The
keyAEData parameter of the OSA event contains the new data for the object. You
can use the AEGetParamPtr function to get the data out of the OSA event.

You specify the OSA event that contains the desired parameter, the keyword of
the desired parameter, the descriptor type the function should use to return
the data, a buffer to store the data, and the size of this buffer as parameters
to the AEGetParamPtr function. The AEGetParamPtr function returns the
descriptor type of the resulting data and the actual size of the data, and it
places the requested data in the specified buffer.


long      theInteger;
OSAEvent    theOSAEvent;
DescType    returnedType;
Size      actualSize;
OSErr      myErr;

myErr = AEGetParamPtr(&theOSAEvent, keyAEData, typeLongInteger,
           &returnedType, &theInteger, sizeof(theInteger),
           &actualSize);

In this example, the keyAEData keyword specifies the parameter from which the
data should be extracted; AEGetParamPtr returns the data in the buffer
specified by the theInteger variable.

You can request that the OSA Event Manager return the data using the descriptor
type of the original data or you can request that the OSA Event Manager coerce
the data into a descriptor type that is different from the original. To prevent
coercion, specify the desired descriptor type as typeWildCard.

In this example, the AEGetParamPtr function returns, in the returnedType
variable, the descriptor type of the resulting data. The descriptor type of the
resulting data matches the requested descriptor type unless the OSA Event
Manager was not able to coerce the data to the specified descriptor type or you
specified the desired descriptor type as typeWildCard. If the coercion fails,
the OSA Event Manager returns the errAECoercionFail result code.

The AEGetParamPtr function returns, in the actualSize variable, the actual size
of the data (that is, the size of coerced data, if any coercion was performed).
If the value returned in this variable is greater than the amount your
application allocated for the buffer to hold the returned data, your
application can increase the size of its buffer to this amount, and get the
data again. You can also choose to use the AEGetParamDesc function when your
application does not know the size of the data.

In general, use the AEGetParamPtr function to extract data that is of fixed
length or known maximum length, and the AEGetParamDesc function to extract data
that is of variable length. The AEGetParamDesc function returns the descriptor
record for an OSA event parameter. This function is useful, for example, for
extracting a descriptor list from a parameter.

You specify, as parameters to AEGetParamDesc, the OSA event that contains the
desired parameter, the keyword of the desired parameter, the descriptor type
the function should use to return the descriptor record, and a buffer to store
the returned descriptor record. The AEGetParamDesc function returns the
descriptor record using the specified descriptor type.

For example, the direct parameter of the Open Documents event contains a
descriptor list that specifies the documents to open. You can use the
AEGetParamDesc function to get the descriptor list out of the direct parameter.


AEDescList  docList;
OSAEvent   theOSAEvent;
OSErr    myErr;

myErr = AEGetParamDesc(&theOSAEvent, keyDirectObject, typeAEList, &docList);

In this example, the OSA event specified by the theOSAEvent variable contains
the desired parameter. The keyDirectObject keyword specifies that the
AEGetParamDesc function should get the descriptor record of the direct
parameter. The typeAEList descriptor type specifies that the descriptor record
should be returned as a descriptor list. In this example, the AEGetParamDesc
function returns a descriptor list in the docList variable.

The descriptor list contains a list of descriptor records. To get the
descriptor records and their data out of a descriptor list, use the
AECountItems function to find the number of descriptor records in the list and
then make repetitive calls to the AEGetKeyPtr function to get the data out of
each descriptor record. See Getting Data Out of a Descriptor List for more
information.

Note that the AEGetParamDesc function copies the descriptor record from the
parameter. When you are done with a descriptor record that you obtained from
AEGetParamDesc, you must dispose of it by calling the AEDisposeDesc function.

If an OSA event parameter consists of an object specifier record, you can use
AEResolve to resolve the object specifier record (that is, locate the OSA event
object it describes), as explained in Finding OSA Event Objects.


ΓòÉΓòÉΓòÉ 5.1.3.2. Getting Data Out of an Attribute ΓòÉΓòÉΓòÉ

You can use the AEGetAttributePtr or AEGetAttributeDesc function to get the
data out of the attributes of an OSA event.

You specify, as parameters to AEGetAttributePtr, the OSA event that contains
the desired attribute, the keyword of the desired attribute, the descriptor
type the function should use to return the data, a buffer to store the data,
and the size of this buffer. The AEGetAttributePtr function returns the
descriptor type of the returned data and the actual size of the data and places
the requested data in the specified buffer.

For example, this code gets the data out of the keyEventSourceAttr attribute of
an OSA event.


OSAEvent  theOSAEvent;
DescType  returnedType;
Integer  sourceOfAE;
Size    actualSize;
OSErr   myErr;

myErr = AEGetAttributePtr(theOSAEvent, keyEventSourceAttr, typeShortInteger,
             returnedType, &sourceOfAE, SizeOf(sourceOfAE),
             actualSize);

The keyEventSourceAttr keyword specifies the attribute from which to get the
data. The typeShortInteger descriptor type specifies that the data should be
returned as a short integer; the returnedType variable contains the actual
descriptor type that is returned. You also must specify a buffer to hold the
returned data and specify the size of this buffer. If the data is not already a
short integer, the OSA Event Manager coerces it as necessary before returning
it. The AEGetAttributePtr function returns, in the actualSize variable, the
actual size of the returned data after coercion has taken place. You can check
this value to make sure you got all the data.

As with the AEGetParamPtr function, you can request that AEGetAttributePtr
return the data using the descriptor type of the original data, or you can
request that the OSA Event Manager coerce the data into a descriptor type that
is different from the original.

In this example, the AEGetAttributePtr function returns the requested data as a
short integer in the sourceOfAE variable, and you can get information about the
source of the OSA event by examining this value. You can test the returned
value against the values defined by the data type AEEventSource.


typedef unsigned char AEEventSource;

The constants defined by the data type AEEventSource. have the following
meanings:

 Constant              Meaning

 kAEUnknownSource      Source of OSA event is unknown.

 kAEDirectCall         A direct call that bypassed the PM message queue.

 kAESameProcess        Target application is also the source application.

 kAELocalProcess       Source application is another process on the same
                       computer as the target application.

 The next example shows how to use the AEGetAttributePtr function to get data
 out of the keyMissedKeywordAttr attribute. After your handler extracts all
 known parameters from an OSA event, it should check whether the
 keyMissedKeywordAttr attribute exists. If it does, then your handler did not
 get all of the required parameters.

 Note that if AEGetAttributePtr returns the errAEDescNotFound result code, then
 the keyMissedKeywordAttr attribute does not exist-that is, your application
 has extracted all of the required parameters. If AEGetAttributePtr returns
 noErr, then the keyMissedKeywordAttr attribute does exist-that is, your
 handler did not get all of the required parameters.


  OSAEvent  theOSAEvent;
  DescType  returnedType;
  Size    actualSize;
  OSErr   myErr;

  myErr = AEGetAttributePtr(&theOSAEvent, keyMissedKeywordAttr, typeWildCard,
               returnedType, NULL, 0, &actualSize);

 The data in the keyMissedKeywordAttr attribute contains the keyword of the
 first required parameter, if any, that your handler did not retrieve. If you
 want this data returned, specify a buffer to hold it and specify the buffer
 size. Otherwise, as in this example, specify NULL as the buffer and 0 as the
 size of the buffer.

 This example shows how to use the AEGetAttributePtr function to get the
 address of the sender of an OSA event from the keyAddressAttr attribute of the
 OSA event:


  OSAEvent  theOSAEvent;
  DescType  returnedType;
  PID    addressOfAE;
  Size    actualSize;
  OSErr   myErr;

  myErr = AEGetAttributePtr(&theOSAEvent, keyAddressAttr, typePID,
               &returnedType, &addressOfAE, sizeof(PID),
               &actualSize);

 For more information about target addresses, see Specifying a Target Address.


ΓòÉΓòÉΓòÉ 5.1.3.3. Getting Data Out of a Descriptor List ΓòÉΓòÉΓòÉ

You can use the AECountItems function to count the number of items in a
descriptor list, and you can use AEGetKeyDesc or AEGetKeyPtr to get a
descriptor record or its data out of a descriptor list.

The Open Documents event contains a direct parameter that specifies the list of
documents to open. The list of documents is contained in a descriptor list.
After extracting the descriptor list from the parameter, you can determine the
number of items in the list and then extract each descriptor record from the
descriptor list. See the second figure in section Descriptor Lists for a
depiction of the Open Documents event.

For example, when your handler receives an Open Documents event, you can use
the AEGetParamDesc function to return the direct parameter as a descriptor
list. You can then use AECountItems to return the number of descriptor records
in the list.


OSAEvent   theOSAEvent;
AEDescList  docList;
LongInt   itemsInList;
OSErr    myErr;

myErr = AEGetParamDesc(&theOSAEvent, keyDirectObject, typeAEList, &docList);
myErr = AECountItems(&docList, &itemsInList);

The AEGetParamDesc function returns, in the docList variable, a copy of the
descriptor list from the direct parameter of the Open Documents event. You
specify this list to the AECountItems function.

You specify the descriptor list whose items you want to count in the
theAEDescList parameter to AECountItems. The OSA Event Manager returns, in the
theCount parameter, the number of items in the list. When extracting the
descriptor records from a list, you often use the number of items as a loop
index. Here is an example:


for (index = 1; index<=itemsInList; ++index) {
   /* for each descriptor record in the list, get its data */
   ...
}

The format of the descriptor records in a descriptor list is private to the OSA
Event Manager. You must use the AEGetKeyPtr or AEGetKeyDesc function to extract
descriptor records from a descriptor list.

You specify the descriptor list that contains the desired descriptor records
and an index as parameters to the AEGetKeyPtr function. The index represents a
specific descriptor record in the descriptor list. The AEGetKeyPtr function
returns the data for the descriptor record represented by the specified index.

You also specify the descriptor type the function should use to return the
data, a buffer to store the data, and the size of this buffer. If the specified
descriptor record exists, the AEGetKeyPtr function for the descriptor record
represented by the specified index. returns the keyword of the parameter, the
descriptor type of the returned data, and the actual size of the data, and it
places the requested data in the specified buffer.

Here is an example that uses the AEGetKeyPtr function to extract an item from
the descriptor list in the direct parameter of the Open Documents event:


AEDescList  docList;
long     index;
AEKeyword  keywd;
DescType   returnedType;
char     myFileName;
Size     actualSize;
OSErr    myErr;

myErr = AEGetNthPtr(&docList, index, typeOS2FileName, keywd, &returnedType,
          &myFileName, sizeof(myFileName), &actualSize);

The docList variable specifies the descriptor list from the direct parameter of
the Open Documents event. The index variable specifies the index of the
descriptor record to extract. You can use the typeOS2FileName descriptor type,
as in this example, to specify that the data be returned as a path name. The
AEGetKeyPtr function returns the keyword for the descriptor record represented
by the specified index of the parameter and the descriptor type of the
resulting data in the keywd and returnedType variables, respectively.

You also specify a buffer to hold the desired data and the size (in bytes) of
the buffer. In this example, the myFileName variable specifies the buffer. The
function returns the actual size of the data in the actualSize variable. If
this size is larger than the size of the buffer you provided, you know that you
did not get all of the data for the descriptor record.

The following code fragment shows a more complete example of extracting the
items from a descriptor list in the Open Documents event.

long     index, itemsInList;
OSErr    myErr;
AEDescList  docList;
AEKeyword  keywd;
DescType   returnedType, typeOS2FileName;
char     myFileName;
Size     actualSize;

for (index=1; index >= itemsInList; ++index) {
  myErr= AEGetNthPtr(&docList, index, typeOS2FileName, &keywd, &returnedType,
            &myFileName, sizeof(myFileName), &actualSize);
  if (myErr =! noErr)
    DoError(myErr);
  myErr = MyOpenFile(&myFileName);
  if (myErr =! noErr)
    DoError(myErr);
}
myErr = AEDisposeDesc(&docList);


ΓòÉΓòÉΓòÉ 5.1.4. Writing OSA Event Handlers ΓòÉΓòÉΓòÉ

For each OSA event your application supports, you must provide a function
called an OSA event handler. The AEProcessOSAEvent function calls one of your
OSA event handlers when it processes an OSA event. Your OSA event handlers
should perform any action requested by the OSA event, add parameters to the
reply OSA event if appropriate, and return a result code.

The OSA Event Manager uses dispatch tables to route OSA events to the
appropriate OSA event handler. You must supply an OSA event handler for each
entry in your application's OSA event dispatch table. Each handler must be a
function that uses this syntax:


OSErr APIENTRY MyEventHandler (OSAEvent *theOSAEvent, OSAEvent reply,
                long handlerRefcon);

The theOSAEvent parameter is the OSA event to handle. Your handler uses OSA
Event Manager functions to extract any parameters and attributes from the OSA
event and then performs the necessary processing. If any of the parameters
include object specifier records, your handler should call AEResolve to resolve
them-that is, to locate the OSA event objects they describe. For more
information, see Resolving and Creating Object Specifier Records in this book.

The reply parameter is the default reply provided by the OSA Event Manager.
(Replying to an OSA Event describes how to add parameters to the default
reply.) The handlerRefcon parameter is the reference constant stored in the OSA
event dispatch table entry for the OSA event. Your handler can check the
reference constant, if necessary, for information about the OSA event.

You can use the reference constant for anything you wish. For example, if you
want to use the same handler for several OSA events, you can install entries
for each event in your application's OSA event dispatch table that specify the
same handler but different reference constants. Your handler can then use the
reference constant to distinguish the different OSA events it handles.

After extracting all known parameters from the OSA event, every handler should
determine whether the OSA event contains any further required parameters. Your
handler can determine whether it retrieved all the required parameters by
checking whether the keyMissedKeywordAttr attribute exists. If the attribute
exists, then your handler has not retrieved all the required parameters and
should immediately return an error. If the attribute does not exist, then the
OSA event does not contain any more required parameters, although it may
contain additional optional parameters.

The OSA Event Manager determines which parameters are optional according to the
keywords listed in the keyOptionalKeywordAttr attribute. The source application
is responsible for adding these keywords to the keyOptionalKeywordAttr
attribute, but is not required to do so, even if that parameter is listed in
the OSA Event Registry: Standard Suites as an optional parameter. If the source
application does not add the necessary keyword to the keyOptionalKeywordAttr
attribute, the target application treats the parameter as required for that OSA
event. If the target application supports the parameter, it should handle the
OSA event as the source application expects. If the target application does not
support the parameter and checks whether it has received all the required
parameters, it finds that there is another parameter that the client
application considered required, and should return the result code
errAEParamMissed without attempting to handle the event.

The following code fragment shows a function that checks for a
keyMissedKeywordAttr attribute. A handler calls this function after getting all
the required parameters it knows about from an OSA event.

OSErr MyGotRequiredParams (OSAEvent theOSAEvent)
{
  OSErr    myErr;
  DescType  desiredType, *descriptorType;
  AEKeyword  theAEKeyword;
  Size    actualSize;

  myErr = AEGetAttributePtr(&theOSAEvent, theAEKeyword, desiredType,
               descriptorType, NULL, 0, &actualSize);
  if (myErr == errAEDescNotFound)
   /*you got all the required parameters*/
   return (noErr);
  if (myErr == noErr)
   /*you missed a required parameter*/
   return (errAEParamMissed);
}

The code in the previous code fragment uses the AEGetAttributePtr function to
get the keyMissedKeywordAttr attribute. This attribute contains the first
required parameter, if any, that your handler did not retrieve. If
AEGetAttributePtr returns the errAEDescNotFound result code, the OSA event does
not contain a keyMissedKeywordAttr attribute. If the OSA event does not contain
this attribute, then your handler has extracted all of the parameters that the
client application considered required.

If the AEGetAttributePtr function returns noErr as the result code, then the
attribute does exist, meaning that your handler has not extracted all of the
required parameters. In this case, your handler should return an error and not
process the OSA event.

The first remaining required parameter is specified by the data of the
keyMissedKeywordAttr attribute. If you want this data returned, specify a
buffer to hold the data. Otherwise, specify NULL as the buffer and 0 as the
size of the buffer. If you specify a buffer to hold the data, you can check the
value of the actualSize parameter to see if the data is larger than the buffer
you allocated.

For more information about specifying OSA event parameters as optional or
required, see Specifying Optional Parameters for an OSA Event.


ΓòÉΓòÉΓòÉ 5.1.5. Replying to an OSA Event ΓòÉΓòÉΓòÉ

Your handler routine for a particular OSA event is responsible for performing
the action requested by the OSA event, and can optionally return data in a
reply OSA event. The OSA Event Manager passes a default reply OSA event to your
handler. The default reply OSA event has no parameters when it is passed to
your handler. Your handler can add parameters to the reply OSA event. If the
client application requested a reply, the OSA Event Manager returns the reply
OSA event to the client.

The reply OSA event is identified by the kCoreEventClass event class and by the
kAEAnswer event ID. If the client application specified the kAENoReply flag in
the reply parameter of the AESend function, the OSA Event Manager passes a null
descriptor record (a descriptor record of type typeNull whose data handle has
the value NULL) to your handler instead of a default reply OSA event. Your
handler should check the descriptor type of the reply OSA event before
attempting to add any attributes or parameters to it. An attempt to add an OSA
event attribute or parameter to a null descriptor record generates an error.

If the client application requests a reply, the OSA Event Manager prepares a
reply OSA event for the client by passing a default reply OSA event to your
handler. The default reply OSA event has no parameters when it is passed to
your handler. Your handler can add any parameters to the reply OSA event. If
your application is a spelling checker, for example, you can return a list of
misspelled words in a parameter.

When your handler finishes processing an OSA event, it returns a result code to
AEProcessOSAEvent, which returns this result code as its function result. If
your handler returns a nonzero result code, and if you have not added your own
keyErrorNumber parameter, the OSA Event Manager also returns this result code
to the client application by putting the result code into a keyErrorNumber
parameter for the reply OSA event. The client can check for the existence of
this parameter to determine whether the handler performed the requested action.

The client application specifies whether it wants a reply OSA event or not by
specifying flags (represented by constants) in the sendMode parameter of the
AESend function.

If the client specifies the kAEWaitReply flag in the sendMode parameter, the
AESend function does not return until the timeout specified by the
timeOutInTicks parameter expires or the server application returns a reply.
When the server application returns a reply, the reply parameter to AESend
contains the reply OSA event that your handler returned to the
AEProcessOSAEvent function. When the client application no longer needs the
original OSA event and the reply event, it must dispose of them, but the OSA
Event Manager disposes of both the OSA event and the reply event for the server
application when the server's handler returns to AEProcessOSAEvent.

If the client specified the kAEQueueReply flag, the client receives the reply
event at a later time during its normal processing of other events.

Your handler should always set its function result to noErr if it successfully
handles the OSA event. If an error occurs, your handler should return either
errAEEventNotHandled or some other nonzero result code. If the error occurs
because your application cannot understand the event, return
errAEEventNotHandled. This allows the OSA Event Manager to look for a handler
in the system special handler or system OSA event dispatch tables that might be
able to handle the event. If the error occurs because the event is impossible
to handle as specified, return the result code returned by whatever function
caused the failure, or whatever other result code is appropriate.

For example, suppose your application receives a Get Data event requesting the
name of the current printer, and your application cannot handle such an event.
In this situation, you should return errAEEventNotHandled in case another
handler available to the OSA Event Manager can handle the Get Data event. This
strategy allows users to take advantage of system capabilities from within your
application via system handlers.

However, if your application cannot handle a Get Data event that requests the
fifth paragraph in a document because the document contains only four
paragraphs, you should return some other nonzero error, because further
attempts to handle the event are pointless.

If your OSA event handler calls the AEResolve function and AEResolve calls an
object accessor function in the system object accessor dispatch table, your OSA
event handler may not recognize the descriptor type of the token returned by
the function. In this case, your handler should return the result code
errAEUnknownObjectType. When your handler returns this result code, the OSA
Event Manager attempts to locate a system OSA event handler that can recognize
the token. For more information, see Installing Entries in the Object Accessor
Dispatch Tables.

The OSA Event Manager automatically adds any nonzero result code that your
handler returns to a keyErrorNumber parameter in the reply OSA event. In
addition to returning a result code, your handler can also return an error
string in the keyErrorString parameter of the reply OSA event. Your handler
should provide meaningful text in the keyErrorString parameter, so that the
client can display this string to the user if desired.

The following code fragment shows how to add the keyErrorString parameter to
the reply OSA event. See Adding Parameters to an OSA Event for a description of
the AEPutParamPtr function.

OSErr MyHandler (OSAEvent theOSAEvent, OSAEvent reply, long handlerRefcon)
{
  OSErr    myErr;
  char    errStr;
  DescType  typeOS2Text;
  LONG    size;

  /* handle your OSA event here */

  /* if an error occurs when handling an OSA event, set the */
  /* function result and error string accordingly */
  if (myErr != noErr) {
   return (myErr);   /* result code to be returned--the */
             /* OSA Event Manager. adds this */
             /* result code to the reply OSA event */
             /* as the keyErrorNumber parameter */
/*   if (reply.dataHandle != NULL) { */
   myErr = AESizeOfDescData(&reply, &size);
   if (size != 0) {
   /* add error string parameter to the default reply */
     errStr = 'Why error occurred';
     myErr = AEPutParamPtr(&reply, keyErrorString, typeOS2Text,
                &errStr, strlen(errStr));
   }
  }
  else
   return (noErr);
}

If your handler needs to return data to the client, it can add parameters to
the reply OSA event. The following code fragment shows how a handler for the
Multiply event (an imaginary OSA event that asks the server to multiply two
numbers) might return the results of the multiplication to the client.

OSErr MyMultHandler (OSAEvent theOSAEvent, OSAEvent reply, long handlerRefcon)
{
  OSErr   myErr;
  long    number1, number2;
  long    replyResult;
  Size    actualSize;
  DescType  returnedType;

  /* get the numbers to multiply from the parameters of the */
  /* OSA event; put the numbers in the number1 and number2 */
  /* variables and then perform the requested multiplication */
  myErr = MyDoMultiply(&theOSAEvent, number1, number2, &replyResult);
  if (myErr == noErr)
   if (reply.dataHandle != NULL)
     /* return result of the multiplication in the reply OSA event */
     myErr = AEPutParamPtr(&reply, keyDirectObject, typeLongInteger,
                &replyResult, sizeof(replyResult));
  return (myErr);
  /* if an error occurs, set the error string accordingly, as shown in */
  /* the previous code example. */
}


ΓòÉΓòÉΓòÉ 5.1.6. Disposing of OSA Event Data Structures ΓòÉΓòÉΓòÉ

Whenever a client application uses OSA Event Manager functions to create a
descriptor record, descriptor list, or OSA event record, the OSA Event Manager
allocates memory for these data structures in the client's application heap.
Likewise, when a server application extracts a descriptor record from an OSA
event by using OSA Event Manager functions, the OSA Event Manager creates a
copy of the descriptor record, including the data to which its handle refers,
in the server's application heap.

Whenever you finish using a descriptor record or descriptor list that you have
created or extracted from an OSA event, you should dispose of the descriptor
record-and thereby deallocate the memory it uses-by calling the AEDisposeDesc
function. If the descriptor record you pass to AEDisposeDesc (such as an OSA
event record or an AE record) includes other nested descriptor records, one
call to AEDisposeDesc will dispose of them all.

When a client application adds a descriptor record to an OSA event (for
example, when it creates a descriptor record by calling AECreateDesc and then
puts a copy of it into a parameter of an OSA event by calling AEPutParamDesc),
it is still responsible for disposing of the original descriptor record. After
a client application has finished using both the OSA event specified in the
AESend function and the reply OSA event, it should dispose of their descriptor
records by calling AEDisposeDesc. The client application should dispose of them
even if AESend returns a nonzero result code.

The OSA event that a server application's handler receives is a copy of the
original event created by the client application. When a server application's
handler returns to AEProcessOSAEvent, the OSA Event Manager disposes of the
server's copy (in the server's application heap) of both the OSA event and the
reply event. The server application is responsible for disposing of any
descriptor records created while extracting data from the OSA event or adding
data to the reply event.

In general, outputs from OSA Event Manager functions are your application's
responsibility. Once you finish using them, you should use AEDisposeDesc to
dispose of any OSA event data structures created or returned by these
functions:

 AECoerceDesc               AEDuplicateDesc

 AECoercePtr                AEGetAttributeDesc

 AECreateOSAEvent           AEGetKeyDesc

 AECreateDesc               AEGetKeyDesc

 AECreateList               AEGetParamDesc

 If you attempt to dispose of descriptor records returned by successful calls
 to these functions without using AEDisposeDesc, your application may not be
 compatible with future versions of the OSA Event Manager. However, if any of
 these functions return a nonzero result code, they return a null descriptor
 record, which does not need to be disposed of.

 Outputs from functions, such as AEGetKeyPtr, that use a buffer rather than a
 descriptor record to return data do not require the use of AEDisposeDesc. It
 is therefore preferable to use these functions for any data that is not
 identified by a handle.

 Some of the functions described in Resolving and Creating Object Specifier
 Records also create descriptor records. If you set the disposeInputs parameter
 to FALSE for any of the following functions, you should dispose of any OSA
 event data structures that they create or return:

 CreateCompDescriptor       CreateObjSpecifier

 CreateLogicalDescriptor    CreateRangeDescriptor

 Your application is also responsible for disposing of some of the tokens it
 creates in the process of resolving an object specifier record. For
 information about token disposal, see Defining Tokens.


ΓòÉΓòÉΓòÉ 5.1.7. Writing and Installing Coercion Handlers ΓòÉΓòÉΓòÉ

When your application extracts data from a parameter, it can request that the
OSA Event Manager return the data using a descriptor type that is different
from the original descriptor type. For example, when extracting data from the
direct parameter of the Open Documents event, you can request that the
character be returned as an integer. The OSA Event Manager can automatically
coerce many different types of data from one to another. The table below shows
descriptor types and the kinds of coercion that the OSA Event Manager can
perform.

You can also provide your own routines, referred to as coercion handlers, to
coerce data into any other descriptor type. To install your own coercion
handlers, use the AEInstallCoercionHandler function. You specify as parameters
to this function a:

     Descriptor type of the data coerced by the handler

     Descriptor type of the resulting data

     Address of the coercion handler for this descriptor type

     Reference constant

     Boolean value that indicates whether your coercion handler expects the
      data to be specified as a descriptor record or as a pointer to the actual
      data

     Boolean value that indicates whether your coercion handler should be
      added to your application's coercion dispatch table or the system
      coercion dispatch table

 The system coercion dispatch table is a table in the DLL that contains
 coercion handlers available to all applications and processes running on the
 same computer. The coercion handlers in your application's coercion dispatch
 table are available only to your application. When attempting to coerce data,
 the OSA Event Manager first looks for a coercion handler in your application's
 coercion dispatch table. If it cannot find a handler for the descriptor type,
 it looks in the system coercion dispatch table for a handler. If it does not
 find a handler there, it attempts to use the default coercion handling
 described by the table below. If it cannot find an appropriate default
 coercion handler, it returns the errAECoercionFail result code.

 Any handler that you add to the system coercion dispatch table should reside
 in a DLL. If there was already an entry in the system coercion dispatch table
 for the same descriptor type, it is replaced. Therefore, if there is an entry
 in the system coercion dispatch table for the same descriptor type, you should
 chain it to your system coercion handler as explained in Creating and Managing
 the Coercion Handler Dispatch Tables.

 You can provide a coercion handler that expects to receive the data in a
 descriptor record or a buffer referred to by a pointer. When you install your
 coercion handler, you specify how your handler wishes to receive the data.
 Whenever possible, you should write your coercion handler so that it can
 accept a pointer to the data, because it is more efficient for the OSA Event
 Manager to provide your coercion handler with a pointer to the data.

 A coercion handler that accepts a pointer to data must be a function with the
 following syntax:


  OSErr MyCoercePtr (DescType typeCode, void *dataPtr, Size dataSize,
            DescType toType,  long handlerRefcon, AEDesc *result);

 The typeCode parameter is the descriptor type of the original data. The
 dataPtr parameter is a pointer to the data to coerce; the dataSize parameter
 is the length, in bytes, of the data. The toType parameter is the desired
 descriptor type of the resulting data. The handlerRefcon parameter is a
 reference constant stored in the coercion table entry for the handler and
 passed to the handler by the OSA Event Manager whenever the handler is called.
 The result parameter is the descriptor record returned by your coercion
 handler.

 Your coercion handler should coerce the data to the desired descriptor type
 and return the data in the descriptor record specified by the result
 parameter. If your handler successfully performs the coercion, it should
 return the noErr result code; otherwise, it should return a nonzero result
 code.

 A coercion handler that accepts a descriptor record must be a function with
 the following syntax:


  OSErr MyCoerceDesc (AEDesc *theAEDesc, DescType toType,
            long handlerRefcon, AEDesc *result,);

 The theAEDesc parameter is the descriptor record that contains the data to be
 coerced. The toType parameter is the descriptor type of the resulting data.
 The handlerRefcon parameter is a reference constant stored in the coercion
 table entry for the handler and passed to the handler by the OSA Event Manager
 whenever the handler is called. The result parameter is the resulting
 descriptor record.

 Your coercion handler should coerce the data in the descriptor record to the
 desired descriptor type and return the data in the descriptor record specified
 by the result parameter. Your handler should return an appropriate result
 code.

 Note:  To ensure that no coercion is performed and that the descriptor type of
 the result is of the same descriptor type as the original, specify
 typeWildCard for the desired type.

 The following table lists the descriptor types for which the OSA Event Manager
 provides coercion.

  ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
  ΓöéOriginal         ΓöéDesired          ΓöéDescription               Γöé
  Γöédescriptor type  Γöédescriptor type  Γöé                          Γöé
  Γöéof data to be    Γöé                 Γöé                          Γöé
  Γöécoerced          Γöé                 Γöé                          Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöétypeChar         ΓöétypeInteger      ΓöéAny string that is a validΓöé
  Γöé                 ΓöétypeLongInteger  Γöérepresentation of a numberΓöé
  Γöé                 ΓöétypeShortInteger Γöécan be coerced into an    Γöé
  Γöé                 ΓöétypeMagnitude    Γöéequivalent numeric value. Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöétypeInteger      ΓöétypeChar         ΓöéAny numeric descriptor    Γöé
  ΓöétypeLongInteger  Γöé                 Γöétype can be coerced into  Γöé
  ΓöétypeShortInteger Γöé                 Γöéthe equivalent text       Γöé
  ΓöétypeMagnitude    Γöé                 Γöéstring.                   Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöétypeInteger      ΓöétypeInteger      ΓöéAny numeric descriptor    Γöé
  ΓöétypeLongInteger  ΓöétypeLongInteger  Γöétype can be coerced into  Γöé
  ΓöétypeShortInteger ΓöétypeShortInteger Γöéany other numeric         Γöé
  ΓöétypeMagnitude    ΓöétypeMagnitude    Γöédescriptor type.          Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöétypeChar         ΓöétypeType         ΓöéAny four-character string Γöé
  Γöé                 ΓöétypeEnumerated   Γöécan be coerced to one of  Γöé
  Γöé                 ΓöétypeKeyword      Γöéthese descriptor types.   Γöé
  Γöé                 ΓöétypeProperty     Γöé                          Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöétypeEnumerated   ΓöétypeChar         ΓöéAny of these descriptor   Γöé
  ΓöétypeKeyword      Γöé                 Γöétypes can be coerced to   Γöé
  ΓöétypeProperty     Γöé                 Γöéthe equivalent text       Γöé
  ΓöétypeType         Γöé                 Γöéstring.                   Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöétypeOS2Text      ΓöétypeChar         ΓöéThe result contains text  Γöé
  Γöé                 Γöé                 Γöéonly, without the code    Γöé
  Γöé                 Γöé                 Γöépage or country code from Γöé
  Γöé                 Γöé                 Γöéthe original descriptor   Γöé
  Γöé                 Γöé                 Γöérecord.                   Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöétypeTrue         ΓöétypeBoolean      ΓöéThe result is the Boolean Γöé
  Γöé                 Γöé                 Γöévalue TRUE.               Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöétypeFalse        ΓöétypeBoolean      ΓöéThe result is the Boolean Γöé
  Γöé                 Γöé                 Γöévalue FALSE.              Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöétypeEnumerated   ΓöétypeBoolean      ΓöéThe enumerated value true Γöé
  Γöé                 Γöé                 Γöébecomes the Boolean value Γöé
  Γöé                 Γöé                 ΓöéTRUE. The enumerated valueΓöé
  Γöé                 Γöé                 Γöéfals becomes the Boolean  Γöé
  Γöé                 Γöé                 Γöévalue FALSE.              Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöétypeBoolean      ΓöétypeEnumerated   ΓöéThe Boolean value FALSE   Γöé
  Γöé                 Γöé                 Γöébecomes the enumerated    Γöé
  Γöé                 Γöé                 Γöévalue fals. The Boolean   Γöé
  Γöé                 Γöé                 Γöévalue TRUE becomes the    Γöé
  Γöé                 Γöé                 Γöéenumerated value true.    Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöétypeShortInteger ΓöétypeBoolean      ΓöéA value of 1 becomes the  Γöé
  Γöé                 Γöé                 ΓöéBoolean value TRUE. A     Γöé
  Γöé                 Γöé                 Γöévalue of 0 becomes the    Γöé
  Γöé                 Γöé                 ΓöéBoolean value FALSE.      Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöétypeBoolean      ΓöétypeShortInteger ΓöéA value of FALSE becomes  Γöé
  Γöé                 Γöé                 Γöé0. A value of TRUE becomesΓöé
  Γöé                 Γöé                 Γöé1.                        Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöéany descriptor   ΓöétypeAEList       ΓöéA descriptor record is    Γöé
  Γöétype             Γöé                 Γöécoerced into a descriptor Γöé
  Γöé                 Γöé                 Γöélist containing a single  Γöé
  Γöé                 Γöé                 Γöéitem.                     Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöétypeAEList       Γöétype of list itemΓöéA descriptor list         Γöé
  Γöé                 Γöé                 Γöécontaining a single       Γöé
  Γöé                 Γöé                 Γöédescriptor record is      Γöé
  Γöé                 Γöé                 Γöécoerced into a descriptor Γöé
  Γöé                 Γöé                 Γöérecord.                   Γöé
  ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

 Note:  Some of the descriptor types listed in this table are synonyms; for
 example, the constants typeInteger and typeLongInteger have the same
 four-character code, gnol.


ΓòÉΓòÉΓòÉ 5.2. Reference for Responding to OSA Events ΓòÉΓòÉΓòÉ

This section describes the basic OSA Event Manager data structures and routines
that your application can use to respond to OSA events. It also describes the
syntax for application-defined OSA event handlers and coercion handlers that
your application can provide for use by the OSA Event Manager.

For information about routines used to create and send OSA events, see Creating
and Sending OSA Events. For information about routines and data structures used
with object specifier records, see Resolving and Creating Object Specifier
Records.


ΓòÉΓòÉΓòÉ 5.2.1. Data Structures Used by the OSA Event Manager ΓòÉΓòÉΓòÉ

This section summarizes the major data structures used by the OSA Event
Manager. For an overview of the relationships among these data structures, see
Data Structures within OSA Events.


ΓòÉΓòÉΓòÉ 5.2.1.1. Descriptor Records and Related Data Structures ΓòÉΓòÉΓòÉ

Descriptor records are the fundamental data structures from which OSA events
are constructed. A descriptor record is a data structure of type AEDesc.


typedef struct _AEDesc {
DescType    descriptorType;
Handle     dataHandle;
 } AEDesc;

 Field               Description

 descriptorType      A four-character string of type DescType that indicates
                     the type of data being passed.

 dataHandle          A handle to the data being passed.

 The descriptor type is a structure of type DescType, which in turn is of data
 type unsigned long-that is, a four-character code. Constants, rather than
 these four-character codes, are usually used to refer to descriptor types. The
 following table lists the constants for the basic descriptor types used by the
 OSA Event Manager.

  ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
  ΓöéDescriptor type        ΓöéValue  ΓöéDescription                   Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöétypeAEList             Γöélist   ΓöéList of descriptor records    Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöétypeAERecord           Γöéreco   ΓöéList of keyword-specified     Γöé
  Γöé                       Γöé       Γöédescriptor records            Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöétypeBoolean            Γöébool   ΓöéBoolean value                 Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöétypeChar               ΓöéTEXT   ΓöéUnterminated string           Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöétypeEnumerated         Γöéenum   ΓöéEnumerated data               Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöétypeFalse              Γöéfals   ΓöéFALSE Boolean value           Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöétypeInteger            Γöégnol   Γöé32-bit integer                Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöétypeKeyword            Γöékeyw   ΓöéOSA event keyword             Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöétypeLongInteger        Γöégnol   Γöé32-bit integer                Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöétypeMagnitude          Γöéngam   ΓöéUnsigned 32-bit integer       Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöétypeNull               Γöénull   ΓöéNonexistent data (data handle Γöé
  Γöé                       Γöé       Γöéis NULL)                      Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöétypeOSAEvent           Γöéaevt   ΓöéOSA event record              Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöétypeOS2FileName        Γöé       ΓöéFile name                     Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöétypePID                ΓöéPID    ΓöéProcess ID                    Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöétypeProperty           Γöéprop   ΓöéOSA event property            Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöétypeShortInteger       Γöérohs   Γöé16-bit integer                Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöétypeTrue               Γöétrue   ΓöéTRUE Boolean value            Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöétypeType               Γöétype   ΓöéFour-character code for event Γöé
  Γöé                       Γöé       Γöéclass or event ID             Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöétypeWildCard           Γöé****   ΓöéMatches any type              Γöé
  ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

 For information about descriptor records and descriptor types used with object
 specifier records, see Resolving and Creating Object Specifier Records.

 OSA event attributes, OSA event parameters, object specifier records, tokens,
 and most of the other data structures used by the OSA Event Manager are
 constructed from one or more descriptor records. The OSA Event Manager
 identifies the various parts of an OSA event by means of keywords associated
 with the corresponding descriptor records. The AEKeyword data type is defined
 as a four-character code.


  typedef unsigned long AEKeyword;

 Constants are typically used for keywords. A keyword combined with a
 descriptor record forms a keyword-specified descriptor record, which is
 defined by a data structure of type AEKeyDesc.


  typedef struct _AEKeyDesc {
  AEKeyword    descKey;
  AEDesc      descContent;
   } AEKeyDesc;

 Field               Description

 descKey             A four-character code of type AEKeyword that identifies
                     the data in the descContent field.

 descContent         A descriptor record of type AEDesc.

 Every OSA event includes an attribute that contains the address of the target
 application. A descriptor record that contains an application's address is
 called an address descriptor record, or AEAddressDesc.


  typedef AEDesc AEAddressDesc;

 Many OSA Event Manager functions take or return lists of descriptor records in
 a special descriptor record called a descriptor list. A descriptor list is a
 structure of data type AEDescList whose data consists of a list of other
 descriptor records.


  typedef AEDesc AEDescList;

 Other OSA Event Manager functions take or return lists of keyword-specified
 descriptor records in the form of an AE record. An AE record is a structure of
 data type AERecord whose data handle refers to a list of keyword-specified
 descriptor records.


  typedef AEDescList AERecord;

 The handle for a descriptor list of data type AERecord refers to a list of
 keyword-specified descriptor records that specify OSA event parameters; they
 cannot specify OSA event attributes.

 Finally, a full-fledged OSA event, including both attributes and parameters,
 is an OSA event record, which is a structure of data type OSAEvent.


  typedef AERecord OSAEvent;

 The event class and event ID of an OSA event are specified in OSA Event
 Manager routines by structures of data types AEEventClass and AEEventID,
 respectively.


  typedef unsigned long AEEventClass;

  typedef unsigned long AEEventID;

 For more information about descriptor records and the other data structures
 described in this section, see Data Structures within OSA Events.

 With the exception of array data records, which are described in the next
 section, the other OSA Event Manager data structures used in responding to OSA
 events are described in the section Routines for Responding to OSA events
 under the descriptions of the routines that use them.


ΓòÉΓòÉΓòÉ 5.2.1.2. OSA Event Array Data Types ΓòÉΓòÉΓòÉ

The AEGetArray function creates a C array that corresponds to an OSA event
array in a descriptor list, and the AEPutArray function adds data specified in
a buffer to a descriptor list as an OSA event array.

You can use the data type AEArrayType to define the type of OSA event array you
want to add to or obtain from a descriptor list.


typedef unsigned char AEArrayType;

When your application adds an OSA event array to a descriptor list, it provides
the data for an OSA event array in an array data record, which is defined by
the data type AEArrayData.


union AEArrayData {
short      kAEDataArray[1];
char       kAEPackedArray[1];
Handle      kAEHandleArray[1];
AEDesc      kAEDescArray[1];
AEKeyDesc    kAEKeyDescArray[1];
 } AEArrayData;

The type of array depends on the data for the array:

 Array type          Description of OSA event array

 kAEDataArray        Array items consist of data of the same size and same
                     type, and are aligned on word boundaries.

 kAEDescArray        Array items consist of descriptor records of different
                     descriptor types with data of variable size.

 kAEHandleArray      Array items consist of handles to data of variable size
                     and the same type.

 kAEKeyDescArray     Array items consist of keyword-specified descriptor
                     records with different keywords, different descriptor
                     types, and data of variable size.

 kAEPackedArray      Array items consist of data of the same size and same
                     type, and are packed without regard for word boundaries.

 Array items in OSA event arrays of type kAEDataArray, kAEPackedArray, or
 kAEHandleArray must be factored-that is, contained in a factored descriptor
 list. Before adding array items to a factored descriptor list, you should
 provide both a pointer to the data that is common to all array items and the
 size of that common data when you first call AECreateList to create a factored
 descriptor list. When you call AEPutArray to add the array data to such a
 descriptor list, the OSA Event Manager automatically isolates the common data
 you specified in the call to AECreateList.

 When you call AEGetArray or AEPutArray, you specify a pointer of data type
 AEArrayDataPointer that points to a buffer containing the data for the array.


  typedef AEArrayData *AEArrayDataPointer;


ΓòÉΓòÉΓòÉ 5.2.2. Routines for Responding to OSA events ΓòÉΓòÉΓòÉ

This section describes the OSA Event Manager routines you can use to create and
manage the OSA event dispatch tables, dispatch OSA events, extract information
from OSA events, request user interaction, request more time to respond to OSA
events, suspend and resume OSA event handling, delete descriptor records,
deallocate memory for descriptor records, create and manage the coercion
handler and special handler dispatch tables, and get information about the OSA
Event Manager.


ΓòÉΓòÉΓòÉ 5.2.2.1. Creating and Managing the OSA Event Dispatch Tables ΓòÉΓòÉΓòÉ

An OSA event dispatch table contains entries that specify the event class and
event ID that refer to one or more OSA events, the address of the handler
routine that handles those OSA events, and a reference constant. You can use
the AEInstallEventHandler function to add entries to the OSA event dispatch
table. This function sets up the initial mapping between the handlers in your
application and the OSA events that they handle.

To get the address of a handler currently in the OSA event dispatch table, use
the AEGetEventHandler function. If you need to remove any of your OSA event
handlers after the mapping between handlers and OSA events is established, you
can use the AERemoveEventHandler function.


ΓòÉΓòÉΓòÉ 5.2.2.2. Dispatching OSA Events ΓòÉΓòÉΓòÉ

After receiving a PM message (and optionally determining whether it is an OSA
event other than an OSA event that your application might support), your
application typically calls the AEProcessOSAEvent function to determine the
type of OSA event received and call the corresponding handler.


ΓòÉΓòÉΓòÉ 5.2.2.3. Getting Data or Descriptor Records Out of OSA Event Parameters and Attributes ΓòÉΓòÉΓòÉ

The OSA Event Manager provides four functions that allow you to get data from
OSA event parameters and attributes. The AEGetParamPtr and AEGetParamDesc
functions get data from a specified OSA event parameter. The AEGetAttributePtr
and AEGetAttributeDesc functions get data from a specified OSA event attribute.


ΓòÉΓòÉΓòÉ 5.2.2.4. Counting the Items in Descriptor Lists ΓòÉΓòÉΓòÉ

The AECountItems function counts the number of descriptor records in any
descriptor list, including an OSA event record.


ΓòÉΓòÉΓòÉ 5.2.2.5. Getting Items From Descriptor Lists ΓòÉΓòÉΓòÉ

The OSA Event Manager provides three functions that allow you to get items from
any descriptor list, including an OSA event record. The AEGetKeyPtr and
AEGetKeyDesc functions give you access to the data in a descriptor list. The
AEGetArray function gets data from an array contained in a descriptor list.


ΓòÉΓòÉΓòÉ 5.2.2.6. Getting Data and Keyword-Specified Descriptor Records Out of AE Records ΓòÉΓòÉΓòÉ

The OSA Event Manager provides two functions, AEGetKeyPtr and AEGetKeyDesc,
that allow you to get data and descriptor records out of an AE record or an OSA
event record.


ΓòÉΓòÉΓòÉ 5.2.2.7. Requesting More Time to Respond to OSA events ΓòÉΓòÉΓòÉ

The AEResetTimer function resets the timeout value for an OSA event to its
starting value. A server application can call this function when it knows it
cannot fulfill a client application's request (either by returning a result or
by sending back a reply OSA event) before the client application is due to time
out.


ΓòÉΓòÉΓòÉ 5.2.2.8. Suspending and Resuming OSA Event Handling ΓòÉΓòÉΓòÉ

When your application calls AEProcessOSAEvent and one of your event handlers is
invoked, the OSA Event Manager normally assumes that your application has
finished handling the event when the event handler returns. At this point, the
OSA Event Manager disposes of the event. However, some applications, such as
multi-session servers or any applications that implement their own internal
event queueing, may need to defer handling of the event.

The AESuspendTheCurrentEvent, AEResumeTheCurrentEvent, AESetTheCurrentEvent,
and AEGetTheCurrentEvent functions described in this section allow you to
suspend and resume OSA event handling, specify the OSA event to be handled, and
identify an OSA event that is currently being handled.


ΓòÉΓòÉΓòÉ 5.2.2.9. Getting the Sizes and Descriptor Types of Descriptor Records ΓòÉΓòÉΓòÉ

The OSA Event Manager provides four routines that allow you to get the sizes
and descriptor types of descriptor records that are not part of an OSA event
record. The AESizeOfNthItem function returns the size and descriptor type of a
descriptor record in a descriptor list. The AESizeOfKeyDesc function returns
the size and descriptor type of a keyword-specified descriptor record in an AE
record. You can get the size and descriptor type of an OSA event parameter or
OSA event attribute using the AESizeOfParam and AESizeOfAttribute functions.


ΓòÉΓòÉΓòÉ 5.2.2.10. Deleting Descriptor Records ΓòÉΓòÉΓòÉ

The OSA Event Manager provides three functions that allow you to delete
descriptor records. The AEDeleteItem, AEDeleteKeyDesc, and AEDeleteParam
functions allow you to delete descriptor records from a descriptor list, an AE
record, and an OSA event parameter, respectively.


ΓòÉΓòÉΓòÉ 5.2.2.11. Deallocating Memory for Descriptor Records ΓòÉΓòÉΓòÉ

The AEDisposeDesc function deallocates the memory used by a descriptor record.
Because all OSA event structures (except for keyword-specified descriptor
records) are descriptor records, you can use AEDisposeDesc for any of them.


ΓòÉΓòÉΓòÉ 5.2.2.12. Coercing Descriptor Types ΓòÉΓòÉΓòÉ

The OSA Event Manager provides two functions that allow you to coerce
descriptor types. The AECoercePtr function takes a pointer to data and a
desired descriptor type and attempts to coerce the data to a descriptor record
of the desired descriptor type. The AECoerceDesc function attempts to coerce
the data in an existing descriptor record to another descriptor type.


ΓòÉΓòÉΓòÉ 5.2.2.13. Creating and Managing the Coercion Handler Dispatch Tables ΓòÉΓòÉΓòÉ

The OSA Event Manager provides three functions that allow you to create and
manage the coercion handler dispatch tables. The AEInstallCoercionHandler
function installs a coercion handler routine in either the application or
system coercion dispatch table. The AEGetCoercionHandler function returns the
handler for a specified descriptor type coercion. The AERemoveCoercionHandler
function removes a coercion handler from either the application or system
coercion table.


ΓòÉΓòÉΓòÉ 5.2.2.14. Creating and Managing the Special Handler Dispatch Tables ΓòÉΓòÉΓòÉ

The OSA Event Manager provides three functions that allow you to create and
manage the special handler dispatch tables. The AEInstallSpecialHandler
function installs an entry for a special handler in either the application or
system special handler dispatch table. The AEGetSpecialHandler function returns
the handler for a specified special handler. The AERemoveSpecialHandler
function removes a special handler from either the application or system
special handler dispatch table.

You can also use the AEInstallSpecialHandler, AEGetSpecialHandler, and
AERemoveSpecialHandler functions to install, get, and remove object callback
functions-including system object callback functions, which cannot be installed
with the AESetObjectCallbacks function. When calling any of these three
functions, use one of the following constants as the value of the functionClass
parameter to specify the object callback function:

 Object callback function      Constant
 Object-counting function      keyAECountProc
 Object-comparison function    keyAECompareProc
 Token disposal function       keyDiposeTokenProc
 Error callback function       keyAEGetErrDescProc
 Mark token function           keyAEMarkTokenProc
 Object-marking function       keyAEMarkProc
 Mark-adjusting function       keyAEAdjustMarksProc

 You can also use the AERemoveSpecialHandler function to disable all the OSA
 Event Manager routines that support object specifier records. To do this,
 specify the constant keySelectProc in the functionClass parameter.


ΓòÉΓòÉΓòÉ 5.2.2.15. Getting Information About the OSA Event Manager ΓòÉΓòÉΓòÉ

The AEManagerInfo routine allows you to get two kinds of information related to
OSA events on the current computer: the number of processes currently recording
OSA events and the version of the OSA Event Manager. If you decide to make your
application recordable, this information may be useful when your application is
responding to OSA events that it sends to itself.


ΓòÉΓòÉΓòÉ 5.2.3. Application-Defined Routines ΓòÉΓòÉΓòÉ

For each OSA event your application supports, you must provide an OSA event
handler. The AEProcessOSAEvent function calls one of your OSA event handlers
when it processes an OSA event. An OSA event handler (MyEventHandler) should
perform any action described by the OSA event, add parameters to the reply OSA
event if appropriate, and return a result code.

You can also provide your own coercion handlers to coerce data to descriptor
types other than those for which the OSA Event Manager provides coercion
handling. The MyCoercePtr function accepts a pointer to data and returns a
descriptor record, and the MyCoerceDesc function accepts a descriptor record
and returns a descriptor record.


ΓòÉΓòÉΓòÉ 5.2.3.1. MyEventHandler ΓòÉΓòÉΓòÉ

This function is an example of an OSA event handler.

Syntax


#define INCL_OSAEVENT

#include <os2.h>

OSErr MyEventHandler (OSAEvent *theOSAEvent, OSAEvent reply,
           long handlerRefcon)

Parameters

 theOSAEvent (OSAEvent *) - input
     The OSA event to handle.

 reply (OSAEvent) - input
     The default reply OSA event provided by the OSA Event Manager.

 handlerRefcon (long) - input
     The reference constant stored in the OSA event dispatch table for the OSA
     event.

 Returns

 rc (OSErr) - returns
     Return code.

 Remarks

 An OSA event handler should extract any parameters and attributes from the OSA
 event, perform the requested action, and add parameters to the reply OSA event
 if appropriate.

 Your handler should always set its function result to noErr if it successfully
 handles the OSA event. If an error occurs, your handler should return either
 errAEEventNotHandled or some other nonzero result code. If the error occurs
 because your application cannot understand the event, return
 errAEEventNotHandled, in case a handler in the system special handler or
 system OSA event dispatch tables might be able to handle the event. If the
 error occurs because the event is impossible to handle as specified, return
 the result code returned by what ever function caused the failure, or whatever
 other result code is appropriate.

 For example, suppose your application receives a Get Data event that requests
 the name of the current printer, and your application cannot handle such an
 event. In this situation, you should return errAEEventNotHandled in case
 another handler available to the OSA Event Manager can handle the event. This
 strategy allows users to take advantage of system capabilities from within
 your application via system handlers.

 However, if your application cannot handle a Get Data event that requests the
 fifth paragraph in a document because the document contains only four
 paragraphs, you should return some other nonzero error, because further
 attempts to handle the event are pointless.

 If your OSA event handler calls the AEResolve function and AEResolve calls an
 object accessor function in the system object accessor dispatch table, your
 OSA event handler may not recognize the descriptor type of the token returned
 by the function. In this case, your handler should return the result code
 errAEUnknownObjectType. When your handler returns this result code, the OSA
 Event Manager attempts to locate a system OSA event handler that can recognize
 the token.


ΓòÉΓòÉΓòÉ 5.2.3.2. MyCoercePtr ΓòÉΓòÉΓòÉ

This function is an example of a coercion handler that accepts a pointer to
data.

Syntax

#define INCL_OSAEVENT

#include <os2.h>

OSErr MyCoercePtr (DescType typeCode, void *dataPtr, Size dataSize,
          DescType toType, long handlerRefcon, AEDesc *result)

Parameters

 typeCode (DescType) - input
     The descriptor type of the original data.

 dataPtr (void *) - input
     A pointer to the data to coerce.

 dataSize (Size) - input
     The length, in bytes, of the data to coerce.

 toType (DescType) - input
     The desired descriptor type for the resulting descriptor record.

 handlerRefcon (long) - input
     A reference constant that is stored in the coercion dispatch table entry
     for the handler and passed to the handler by the OSA Event Manager
     whenever the handler is called.

 result (AEDesc *) - input
     The resulting descriptor record.

 Returns

 rc (OSErr) - returns
     Return code.

 Remarks

 Your coercion handler should coerce the data to the desired descriptor type
 and return the resulting data in the descriptor record specified by the result
 parameter. Your handler should return the noErr result code if your handler
 successfully performs the coercion, and a nonzero result code otherwise.


ΓòÉΓòÉΓòÉ 5.2.3.3. MyCoerceDesc ΓòÉΓòÉΓòÉ

This function is an example of a coercion handler that accepts a descriptor
record.

Syntax

#define INCL_OSAEVENT

#include <os2.h>

OSErr MyCoerceDesc (AEDesc *theAEDesc, DescType toType, long handlerRefcon,
          AEDesc *result)

Parameters

 theAEDesc (AEDesc *) - input
     The descriptor record that contains the data to be coerced.

 toType (DescType) - input
     The desired descriptor type for the resulting descriptor record.

 handlerRefcon (long) - input
     A reference constant that is stored in the coercion dispatch table entry
     for the handler and passed to the handler by the OSA Event Manager
     whenever the handler is called.

 result (AEDesc *) - input
     The resulting descriptor record.

 Returns

 rc (OSErr) - returns
     Return code.

 Remarks

 Your coercion handler should coerce the data in the descriptor record to the
 desired descriptor type and return the resulting data in the descriptor record
 specified by the result parameter. Your handler should return an appropriate
 result code.


ΓòÉΓòÉΓòÉ 5.3. Summary of Responding to OSA Events ΓòÉΓòÉΓòÉ

The following table summarizes the methods used to respond to OSA events.

ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
ΓöéFunction Name            ΓöéDescription                        Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAEClearDesc              ΓöéInitializes the specified          Γöé
Γöé                         Γöédescriptor record.                 Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAECoerceDesc             ΓöéCoerces the data in a descriptor   Γöé
Γöé                         Γöérecord to another descriptor type. Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAECoercePtr              ΓöéCoerces the data to a desired      Γöé
Γöé                         Γöédescriptor type and, if successful,Γöé
Γöé                         Γöécreates a descriptor record        Γöé
Γöé                         Γöécontaining the newly coerced data. Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAECountItems             ΓöéCounts the number of descriptor    Γöé
Γöé                         Γöérecords in any descriptor list.    Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAEDeleteItem             ΓöéDeletes a descriptor record from a Γöé
Γöé                         Γöédescriptor list. All subsequent    Γöé
Γöé                         Γöédescriptor records will then move  Γöé
Γöé                         Γöéup one place.                      Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAEDeleteKeyDesc          ΓöéDeletes a keyword-specific         Γöé
Γöé                         Γöédescriptor record from an AE       Γöé
Γöé                         Γöérecord.                            Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAEDeleteParam            ΓöéDeletes an OSA event parameter     Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAEDisposeDesc            ΓöéDeallocates the memory used by a   Γöé
Γöé                         Γöédescriptor record.                 Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAEGetAppName             ΓöéReturns the name of an application Γöé
Γöé                         Γöéthat sent an OSA event.            Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAEGetArray               ΓöéConverts an OSA event array (an    Γöé
Γöé                         Γöéarray created with the AEPutArray  Γöé
Γöé                         Γöéfunction and stored in a descriptorΓöé
Γöé                         Γöélist) to the corresponding array   Γöé
Γöé                         Γöéand places the converted array in  Γöé
Γöé                         Γöéthe specified buffer.              Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAEGetAttributeDesc       ΓöéReturns the descriptor record for aΓöé
Γöé                         Γöéspecified OSA event attribute.     Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAEGetAttributePtr        ΓöéReturns a pointer to a buffer that Γöé
Γöé                         Γöécontains the data from a specified Γöé
Γöé                         ΓöéOSA event attribute.               Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAEGetCoercionHandler     ΓöéReturns the handler for a specifiedΓöé
Γöé                         Γöédescriptor type coercion.          Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAEGetDescData            ΓöéReturns the descriptor type of the Γöé
Γöé                         Γöéspecified descriptor record and a  Γöé
Γöé                         Γöécopy of the data that it           Γöé
Γöé                         Γöéreferences.                        Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAEGetEventHandler        ΓöéReturns an entry from an OSA event Γöé
Γöé                         Γöédispatch table.                    Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAEGetHWND                ΓöéReturns the window handle from a   Γöé
Γöé                         Γöéspecified PID of an application    Γöé
Γöé                         Γöéthat has been registered through   Γöé
Γöé                         Γöéthe AEInit function.               Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAEGetKeyDesc             ΓöéObtains the descriptor record for aΓöé
Γöé                         Γöékeyword-specified descriptor       Γöé
Γöé                         Γöérecord.                            Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAEGetKeyPtr              ΓöéReturns a pointer to a buffer that Γöé
Γöé                         Γöécontains the data from a           Γöé
Γöé                         Γöékeyword-specified descriptor       Γöé
Γöé                         Γöérecord.                            Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAEGetNthDesc             ΓöéReturns a copy of a descriptor     Γöé
Γöé                         Γöérecord from any descriptor list.   Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAEGetNthPtr              ΓöéReturns a pointer to a buffer that Γöé
Γöé                         Γöécontains a copy of a descriptor    Γöé
Γöé                         Γöérecord from any descriptor list.   Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAEGetParamDesc           ΓöéReturns the descriptor record for aΓöé
Γöé                         Γöéspecified OSA event parameter.     Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAEGetParamPtr            ΓöéObtains a pointer to a buffer that Γöé
Γöé                         Γöécontains the data from a specified Γöé
Γöé                         ΓöéOSA event parameter.               Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAEGetPID                 ΓöéReturns the process ID (PID) of theΓöé
Γöé                         Γöéspecified application that has     Γöé
Γöé                         Γöéissued an AEInit function.         Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAEGetSpecialHandler      ΓöéReturns the specified special      Γöé
Γöé                         Γöéhandler.                           Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAEGetTheCurrentEvent     ΓöéReturns the OSA event that is      Γöé
Γöé                         Γöécurrently being handled.           Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAEInit                   ΓöéRegisters a semantic-event aware   Γöé
Γöé                         Γöéapplication with the OSA Event     Γöé
Γöé                         ΓöéManager.                           Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAEInstallCoercionHandler ΓöéInstalls a coercion  handler       Γöé
Γöé                         Γöéroutine in the application's       Γöé
Γöé                         Γöécoercion handler dispatch table.   Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAEInstallEventHandler    ΓöéInstalls a coercion handler routineΓöé
Γöé                         Γöéin the application's coercion      Γöé
Γöé                         Γöéhandler dispatch table.            Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAEInstallSpecialHandler  ΓöéInstalls a special handler in the  Γöé
Γöé                         Γöéapplication's special handler      Γöé
Γöé                         Γöédispatch table.                    Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAELaunchApplication      ΓöéLaunches an application on a local Γöé
Γöé                         Γöémachine.                           Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAEManagerInfo            ΓöéObtains information about the      Γöé
Γöé                         Γöéversion of the OSA Event Manager   Γöé
Γöé                         Γöécurrently available or the number  Γöé
Γöé                         Γöéof processes that are currently    Γöé
Γöé                         Γöérecording OSA events.              Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAEProcessOSAEvent        ΓöéCalls the appropriate handler for aΓöé
Γöé                         Γöéspecified OSA event.               Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAERemoveCoercionHandler  ΓöéRemoves a handler from the         Γöé
Γöé                         Γöéapplication's special handler      Γöé
Γöé                         Γöédispatch table.                    Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAERemoveEventHandler     ΓöéRemoves an entry form the          Γöé
Γöé                         Γöéapplication's OSA event dispatch   Γöé
Γöé                         Γöétable.                             Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAERemoveSpecialHandler   ΓöéRemoves an entry form the          Γöé
Γöé                         Γöéapplication's special handler      Γöé
Γöé                         Γöédispatch table.                    Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAEResetTimer             ΓöéResets the timeout value for an OSAΓöé
Γöé                         Γöéevent to its starting value.       Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAEResumeTheCurrentEvent  ΓöéInforms the OSA Event Manager that Γöé
Γöé                         Γöéthe application wants to resume theΓöé
Γöé                         Γöéhandling of a previously           Γöé
Γöé                         ΓöésuspendedOSA event or that it has  Γöé
Γöé                         Γöécompleted the handling of the OSA  Γöé
Γöé                         Γöéevent.                             Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAESetTheCurrentEvent     ΓöéSpecifies the OSA event to be      Γöé
Γöé                         Γöéhandled.                           Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAESizeOfAttribute        ΓöéReturns the size and descriptor    Γöé
Γöé                         Γöétype of an OSA event attribute.    Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAESizeOfDescData         ΓöéReturns the size of the descriptor Γöé
Γöé                         Γöédata that is contained in the      Γöé
Γöé                         Γöéspecified descriptor record.       Γöé
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ΓöéAESizeOfKeyDesc          ΓöéReturns the size and descriptor    Γöé
Γöé                         Γöétype of a keyword-specified        Γöé
Γöé                         Γöédescriptor record in an AE record. Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAESizeOfNthItem          ΓöéReturns the size and descriptor    Γöé
Γöé                         Γöétype of a descriptor record in a   Γöé
Γöé                         Γöédescriptor list.                   Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAESizeOfParam            ΓöéReturns the size and descriptor    Γöé
Γöé                         Γöétype of an OSA event parameter.    Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAESuspendTheCurrentEvent ΓöéSuspends the processing of the OSA Γöé
Γöé                         Γöéevent that is currently being      Γöé
Γöé                         Γöéhandled.                           Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAETerminate              ΓöéCleans up internal data structures Γöé
Γöé                         Γöéwhen an application ends.          Γöé
ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ


ΓòÉΓòÉΓòÉ 6. Creating and Sending OSA Events ΓòÉΓòÉΓòÉ

This chapter describes how your application can use the OSA Event Manager to
create and send OSA events. If you want to factor your application for
recording, or if you want your application to send OSA events directly to other
applications, you can use OSA Event Manager routines to create and send OSA
events.

Before you read this chapter, you should be familiar with Interapplication
Communication, OSA Events, and Responding to OSA Events.

This chapter provides the basic information you need to create and send OSA
events from your application. To send core and functional-area OSA events, your
application must also be able to create object specifier records. For
information about object specifier records, see Resolving and Creating Object
Specifier Records.

The first section in this chapter, Creating an OSA Event, describes how to:

     Create an OSA event
     Add parameters to an OSA event
     Specify optional OSA event parameters
     Specify a target address

 The section Sending an OSA Event describes how to:

     Send an OSA event
     Deal with time-outs


ΓòÉΓòÉΓòÉ 6.1. Creating an OSA Event ΓòÉΓòÉΓòÉ

You create an OSA event using the AECreateOSAEvent function. You supply
parameters that specify the event class and event ID, the target address, the
return ID, the transaction ID, and a buffer for the returned OSA event. The
AECreateOSAEvent function creates and returns, in the buffer you specify, an
OSA event with the attributes set as your application requested. You should not
directly manipulate the contents of the OSA event; rather, use OSA Event
Manager functions to add additional attributes or parameters to it.

The example that follows creates an imaginary Multiply event using the
AECreateOSAEvent function:


myErr = AECreateOSAEvent (kArithmeticClass, kMultEventID, &targetAddress,
             kAutoGenerateReturnID, kAnyTransactionID,
             &theOSAEvent);

The event class, specified by the kArithmeticClass constant, identifies this
event as belonging to a class of OSA events for arithmetic operations. The
event ID specifies the particular OSA event within the class-in this case, an
OSA event that performs multiplication.

You specify the target of the OSA event in the target parameter to
AECreateOSAEvent. The target address can identify an application on the local
computer. You can specify the address using a process ID (PID).

In the returnID parameter, you specify the return ID of the OSA event, which
associates this OSA event with the server's reply. The AECreateOSAEvent
function assigns the specified return ID value to the keyReturnIDAttr attribute
of the OSA event. If a server returns a standard reply OSA event (that is, an
event of event class aevt and event ID ansr) in response to this event, the OSA
Event Manager assigns the reply event the same return ID. When you receive a
reply OSA event, you can check the keyReturnIDAttr attribute to determine which
outstanding OSA event the reply is responding to. You can use the
kAutoGenerateReturnID constant to request that the OSA Event Manager generate a
return ID that is unique to this session for the OSA event. Otherwise, you are
responsible for making it unique.

The transactionID parameter specifies the transaction ID attribute of the OSA
event. A transaction is a sequence of OSA events that are sent back and forth
between the client and server applications, beginning with the client's initial
request for a service. All OSA events that are part of one transaction must
have the same transaction ID.

You can use a transaction ID to indicate that an OSA event is one of a sequence
of OSA events related to a single transaction. The kAnyTransactionID constant
indicates that the OSA event is not part of a transaction.

The AECreateOSAEvent function creates an OSA event with only the specified
attributes and no parameters. To add parameters or additional attributes, you
can use other OSA Event Manager functions.


ΓòÉΓòÉΓòÉ 6.1.1. Adding Parameters to an OSA Event ΓòÉΓòÉΓòÉ

You can use the AEPutParamPtr or AEPutParamDesc function to add parameters to
an OSA event. When you use either of these functions, the OSA Event Manager
adds the specified parameter to the OSA event.

Use the AEPutParamPtr function when you want to add data specified in a buffer
as the parameter of an OSA event. You specify the OSA event, the keyword of the
parameter to add, the descriptor type, a buffer that contains the data, and the
size of this buffer as parameters to the AEPutParamPtr function. The
AEPutParamPtr function adds the data to the OSA event as a parameter with the
specified keyword.

For example, this code adds a parameter to the Multiply event using the
AEPutParamPtr function:


#define  keyOperand1 '1NPO'

long    number1;
OSAEvent  theOSAEvent;
OSErr   myErr;

number1 = 10;
myErr = AEPutParamPtr (&theOSAEvent, keyOperand1, typeLongInteger, &number1,
            sizeof(number1));

In this example, the OSA Event Manager adds the parameter containing the first
number to the specified OSA event.

Use the AEPutParamDesc function to add a descriptor record to an OSA event. The
descriptor record you specify must already exist. To create or get a descriptor
record, you can use the AECreateDesc, AEDuplicateDesc, and other OSA Event
Manager functions that return a descriptor record.

When you create a descriptor record using the AECreateDesc function, you
specify the descriptor type, a buffer that contains the data, and the size of
this buffer as parameters. The AECreateDesc function returns the descriptor
record that describes the data.

This example creates a descriptor record for the second parameter of the
Multiply event:


long   number2;
AEDesc  multParam2Desc;
OSErr   myErr;

number2 = 8;
myErr = AECreateDesc(typeLongInteger, &number2, sizeof(number2),
           &multParam2Desc);

In this example, the AECreateDesc function creates a descriptor record with the
typeLongInteger descriptor type and the data identified in the number2
variable.

Once you have created a descriptor record, you can use AEPutParamDesc to add
the data to an OSA event parameter. You specify the OSA event to add the
parameter to, the keyword of the parameter, and the descriptor record of the
parameter as parameters to the AEPutParamDesc function.

This example adds a second parameter to the Multiply event using the
AEPutParamDesc function:


#define  keyOperand2  '2NPO'

myErr = AEPutParamDesc (&theOSAEvent, keyOperand2, &multParam2Desc);

This example adds the keyOperand2 keyword and the descriptor record created in
the previous example as the second parameter to the specified OSA event.

Whatever method you use to create a descriptor record, you can add it to an OSA
event parameter by using the AEPutParamDesc function.

After adding parameters to an OSA event, you can send the OSA event using the
AESend function. See Sending an OSA Event for information about using this
function.


ΓòÉΓòÉΓòÉ 6.1.2. Specifying Optional Parameters for an OSA Event ΓòÉΓòÉΓòÉ

The parameters for a given OSA event are listed in the OSA Event Registry:
Standard Suites as either required or optional. Your application does not
usually have to include OSA event parameters that are listed as optional; the
target application uses default values for parameters that are listed as
optional if your application does not provide them. The OSA Event Registry:
Standard Suites defines the default value a target application should use for
each optional parameter of a specific OSA event.

The guidelines listed in the OSA Event Registry: Standard Suites for which
parameters should be considered optional and which should be considered
required are not enforced by the OSA Event Manager. Instead, the source
application indicates which OSA event parameters it considers optional by
listing the keywords for those parameters in the keyOptionalKeywordAttr
attribute.

The keyOptionalKeywordAttr attribute does not contain the optional parameters;
it simply lists the keywords of any parameters for the OSA event that the
source application wants to identify as optional. Although the source
application is responsible for providing this information in the
keyOptionalKeywordAttr attribute of an OSA event, it is not required to provide
this attribute.

If a keyword for an OSA event parameter is not included in the
keyOptionalKeywordAttr attribute, the source application expects the target
application to understand the OSA event parameter identified by that keyword.
If a target application cannot understand the parameter, it should return the
result code errAEParamMissed and should not attempt to handle the event.

If a keyword for an OSA event parameter is included in the
keyOptionalKeywordAttr attribute, the source application does not require the
target application to understand the OSA event parameter identified by that
keyword. If the target application cannot understand a parameter whose keyword
is included in the keyOptionalKeywordAttr attribute, it should ignore that
parameter and attempt to handle the OSA event as it normally does.

A source application can choose not to list the keyword for an OSA event
parameter in the keyOptionalKeywordAttr attribute even if that parameter is
listed in the OSA Event Registry: Standard Suites as an optional parameter.
This has the effect of forcing the target application to treat the parameter as
required for a particular OSA event. If the target application supports the
parameter, it should handle the OSA event as the client application expects. If
the target application does not support the parameter and calls an
application-defined routine such as MyGotRequiredParams to check whether it has
received all the required parameters, it finds that there is another parameter
that the client application considered required, and should return the result
code errAEParamMissed.

If a source application wants a target application to attempt to handle an OSA
event regardless of whether the target application supports a particular OSA
event parameter included in that OSA event, the source application should list
the keyword for that parameter in the keyOptionalKeywordAttr attribute.

It is up to the source application to decide whether to list a parameter that
is described as optional in the OSA Event Registry: Standard Suites in the
keyOptionalKeywordAttr attribute of an OSA event. For example, suppose a source
application has extended the definition of the Print event to include an
optional keyColorOrGrayscale parameter that specifies printing in color or gray
scale rather than black and white. The source application might decide whether
or not to list the keyword keyColorOrGrayscale in the keyOptionalKeywordAttr
attribute according to the characteristics of the print request. If the source
application requires the target application to print a document in color, the
source application could choose not to add the keyword keyColorOrGrayscale to
the keyOptionalKeywordAttr attribute; in this case, only target applications
that supported the keyColorOrGrayscale parameter would attempt to handle the
event. If the source application does not require the document printed in
color, it could choose to add the keyword keyColorOrGrayscale to the
keyOptionalKeywordAttr attribute; in this case, the target application will
attempt to handle the event regardless of whether it supports the
keyColorOrGrayscale parameter.

Your application can add optional parameters to an OSA event the same way it
adds required parameters, using the AECreateDesc, AEPutParamPtr, and
AEPutParamDesc functions as described in the previous section, Adding
Parameters to an OSA Event. If your application chooses to provide the
keyOptionalKeywordAttr attribute for an OSA event, it should first create a
descriptor list that specifies the keywords of the optional parameters, then
add it to the OSA event as a keyOptionalKeywordAttr attribute.

The following code fragment shows an application-defined routine,
MyCreateOptionalKeyword, that creates the keyOptionalKeywordAttr attribute for
the Save event.

OSErr MyCreateOptionalKeyword (OSAEvent *SaveEvent)
{
  AEDescList optionalList;
  AEKeyword  myOptKeyword1, keyAEFileType;
  AEKeyword  myOptKeyword2, keyAEFile;
  OSErr    myErr;
  OSErr    ignoreErr;

  myOptKeyword1 = keyAEFileType;
  /* create an empty descriptor list */
  myErr = AECreateList(NULL, 0, FALSE, &optionalList);
  if (myErr == noErr) {
    /* add the keyword of the first optional parameter */
    myErr = AEPutPtr(&optionalList, 1, typeKeyword, &myOptKeyword1,
            sizeof(myOptKeyword1));
    if (myErr == noErr) {
     /* add the keyword of the next optional parameter */
     myOptKeyword2 = keyAEFile;
     myErr = AEPutPtr(&optionalList, 2, typeKeyword, &myOptKeyword2,
              sizeof(myOptKeyword2));
    }
    if (myErr == noErr)
     /* create the keyOptionalKeywordAttr attribute and add it */
     /* to the Save event */
     myErr =  AEPutAttributeDesc(SaveEvent, keyOptionalKeywordAttr,
                   &optionalList);
  }
  ignoreErr = AEDisposeDesc(&optionalList);
  return (myErr);
}

The MyCreateOptionalKeyword function shown in the previous code fragment adds
to a descriptor list the keyword of each parameter that the source application
considers optional. Each keyword is added as a descriptor record with the
descriptor type typeKeyword. The function specifies that the target application
can handle the Save event without supporting parameters identified by the
keywords keyAEFileType and keyAEFile. After adding these keywords to the
descriptor list, the function creates the keyOptionalKeywordAttr attribute
using the AEPutAttributeDesc function.

Typically, a target application does not examine the keyOptionalKeywordAttr
attribute directly. Instead, a target application that supports a parameter
listed as optional in the OSA Event Registry: Standard Suites attempts to
extract it from the OSA event (using AEGetParamDesc, for example). If it cannot
extract the parameter, the target application uses the default value, if any,
listed in the OSA Event Registry. A target application can use the
keyMissedKeywordAttr attribute to return the first required parameter (that is,
considered required by the source application), if any, that it did not
retrieve from the OSA event. The keyMissedKeywordAttr attribute does not return
any parameters whose keywords are listed in the keyOptionalKeywordAttr
attribute of the OSA event.


ΓòÉΓòÉΓòÉ 6.1.3. Specifying a Target Address ΓòÉΓòÉΓòÉ

When you create an OSA event, you must specify the address of the target. The
target address identifies the particular application or process to which you
want to send the OSA event. You can send OSA events to applications on the
local computer.

The descriptor type that identifies the method of addressing an OSA event is:

 Descriptor Type             Description
 typePID                     Process ID

 If your application sends an OSA event to itself, it should address the OSA
 event using the PID of kCurrentProcess. This is the fastest way for your
 application to send an OSA event to itself. For more information, see
 Addressing an OSA Event for Direct Dispatching.


ΓòÉΓòÉΓòÉ 6.1.3.1. Creating an Address Descriptor Record ΓòÉΓòÉΓòÉ

You specify the address using an address descriptor record (a descriptor record
of data type AEAddressDesc). You must create a descriptor record of this type
and then add it to the OSA event using the AECreateOSAEvent function.

You can use the AECreateDesc function to create an address descriptor record.
The following code fragment shows an example of creating an address.

OSErr MySetTargetAddresses(AEAddressDesc targetAddress, DescType thePSID)
{
  DescType  thePID;
  OSErr    myErr;

  myErr = AECreateDesc(thePSID, &thePID, sizeof(thePID), &targetAddress);

  /* add your own error checking */
}

To create an address descriptor record, specify the following as parameters to
AECreateDesc: the descriptor type for the address, a pointer to the buffer
containing the address, and the size of the buffer. The AECreateDesc function
returns an address descriptor record with the specified characteristics.

After creating an address, you can specify it as a parameter to the
AECreateOSAEvent function. See Creating an OSA Event for an example using the
AECreateOSAEvent function.

When you specify an address to the AECreateOSAEvent function, the OSA Event
Manager stores the address in the keyAddressAttr attribute of the OSA event.


ΓòÉΓòÉΓòÉ 6.1.3.2. Addressing an OSA Event for Direct Dispatching ΓòÉΓòÉΓòÉ

As described in Recording OSA Events, a recordable application must send itself
OSA events in response to user actions. Your application can send itself OSA
events by using an address descriptor record of descriptor type typePID with
the PID field set to kCurrentProcess. The OSA Event Manager processes such OSA
events immediately, executing the appropriate OSA event handler directly
without going through the normal event-processing sequence. Your application's
performance is not decreased when sending OSA events to itself.

OSA events your application sends to itself this way do not appear in your
application's PM message queue. This not only speeds up delivery of the event
but also avoids situations in which an OSA event sent in response to a user
action arrives in the event queue after some other event that really occurred
later than the user action. For example, suppose a user chooses Cut from the
Edit menu and then clicks in another window. If the Cut event arrives in the
queue after the window activate event, a selection in the wrong window might be
cut.

Your application can send events to itself using other forms of addressing,
such as the true PID returned by AEGetPID. Because direct dispatching avoids
event sequence problems, applications should generally send events to
themselves by using an address descriptor record of descriptor type typePID
with the kCurrentProcess constant rather than using a true PID or an
application signature.

Important:  When OSA event recording has been turned on, the OSA Event Manager
records every event that your application sends to itself unless you specify
the kAEDontRecord flag in the sendMode parameter of the AESend function.


ΓòÉΓòÉΓòÉ 6.2. Sending an OSA Event ΓòÉΓòÉΓòÉ

To send an OSA event, you first create an OSA event, add parameters and
attributes to it, and then use the AESend function to send it.

When you send an OSA event, you specify various options to indicate how the
server should handle the OSA event. You request a user interaction level from
the server whether your application is willing to wait for a reply OSA event,
whether reconnection is allowed, and whether your application wants a return
receipt for the OSA event.

You specify these options by setting flags in the sendMode parameter for
AESend. Here are the constants that represent these flags:

 kAENoReply                 Sender does not want a reply
 kAEQueueReply              Sender wants a reply but will not wait
 kAEWaitReply               Sender wants a reply and will wait
 kAENeverInteract           Server should not interact with user
 kAECanInteract             Server may try to interact with user
 kAEAlwaysInteract          Server should always interact with user where
                            appropriate
 kAECanSwitchLayer          Interaction may switch layer
 kAEDontReconnect           Reserved for future use.
 kAEWantReceipt             Sender wants a receipt of message
 kAEDontRecord              Do not record this event
 kAEDontExecute             Record but do not send the event

 If you want your application to receive a reply OSA event, specify the
 kAEQueueReply or kAEWaitReply flag. If you want your application to receive
 the reply OSA event in its event queue, use kAEQueueReply. If you want your
 application to receive the reply OSA event in the reply parameter for AESend
 and you are willing to block the current thread while it is waiting for the
 reply, use kAEWaitReply. If you do not want your application to receive a
 reply OSA event and your application does not need to wait for the server to
 handle the OSA event, specify kAENoReply.

 Note:  Before the OSA Event Manager sends a reply event back to the client
 application, the keyAddressAttr attribute contains the address of the client
 application. After the client receives the reply event, the keyAddressAttr
 attribute contains the address of the server application.

 If you specify the kAEWaitReply flag, your application must call AESend from a
 separate thread. This allows the main thread to respond to any incoming events
 sent to the PM message queue.

 You use one of the three flags-kAENeverInteract, kAECanInteract, and
 kAEAlwaysInteract-to specify whether the server should interact with the user
 when handling the OSA event. Specify kAENeverInteract if the server should not
 interact with the user when handling the OSA event. You might specify this
 constant if you do not want the user to be interrupted while the server is
 handling the OSA event.

 Use the kAECanInteract flag if the server should interact with the user when
 the user needs to supply information to the server. Use the kAEAlwaysInteract
 flag if the server should interact with the user whenever the server normally
 asks a user to confirm a decision or interact in any other way, even if no
 additional information is needed from the user. Note that it is the
 responsibility of the server and client applications to agree on how to
 interpret the kAEAlwaysInteract flag.

 If the client application does not set any one of the user interaction flags,
 the OSA Event Manager sets a default. The OSA Event Manager sets the
 kAECanInteract flag as the default.

 Specify the kAEWantReceipt flag if your application wants notification that
 the server application has accepted the OSA event. If you specify this flag,
 your application receives a return receipt as a high-level event.

 If you specify the kAEWantReceipt flag and the server application does not
 accept the OSA event within the time specified by the timeOutInTicks parameter
 to AESend, the AESend function returns a time-out error. Note that AESend also
 returns a time-out error if your application sets the kAEWaitReply flag and
 does not receive the reply OSA event within the time specified by the
 timeOutInTicks parameter.

 Specify the kAEDontRecord flag if your application is sending an OSA event to
 itself that you do not want to be recorded. When OSA event recording has been
 turned on, every event that your application sends to itself will be
 automatically recorded by the OSA Event Manager except those sent with the
 kAEDontRecord flag set.

 Specify the kAEDontExecute flag if your application is sending an OSA event to
 itself for recording purposes only-that is, if you want the OSA Event Manager
 to send a copy of the event to the recording process but you do not want your
 application actually to receive the event. (For more information about when to
 use the kAEDontExecute flag, see Recording OSA Events.)

 The following code fragment illustrates how to send a Multiply event (an
 imaginary OSA event for multiplying two long integers). It first creates an
 OSA event, adds parameters containing the numbers to multiply, then sends it,
 specifying various options. It also illustrates how to handle the reply OSA
 event that contains the result.

 Note:  If you want to send OSA events, your application must call AEInit.

  OSErr MySendMultiplyEvent (AEAddressDesc serverAddress, long firstOperand,
                long secondOperand, long replyResult)
  {

  #define  kArithmeticClass  0x48545241  /* 'ARTH' -event class for arithmetic */
                      /*     OSA event. */
  #define  kMultiplyEventID  0x544C554D  /* 'MULT' -event ID for Multiply event*/
  #define  keyMultOperand1  0x314E504F  /* 'OPN1' -keyword for first parameter*/
  #define  keyMultOperand2  0x324E504F  /* 'OPN2' -keyword for second parameter*/

    OSAEvent  theOSAEvent;
    OSAEvent  reply;
    DescType  returnedType;
    long    actualSize, replyResultLongInt;
    OSErr   myErr;
    OSErr   ignoreErr;
    ULONG   STRSIZE=256;
    char    errStr[256];
    long    errNumber;

    myErr = AECreateOSAEvent(kArithmeticClass, kMultiplyEventID,
                &serverAddress, kAutoGenerateReturnID,
                kAnyTransactionID, &theOSAEvent);
    /* add the first operand */
    if (myErr == noErr)
     myErr = AEPutParamPtr(&theOSAEvent, keyMultOperand1, typeLongInteger,
                &firstOperand, sizeof(firstOperand));
    /*add the second operand with the proper keyword*/
    if (myErr == noErr)
     myErr = AEPutParamPtr(&theOSAEvent, keyMultOperand2, typeLongInteger,
                &secondOperand, sizeof(secondOperand));
    if (myErr == noErr)
     myErr = AESend(&theOSAEvent, &reply, kAEWaitReply + kAENeverInteract,
             kAENormalPriority, 120, NULL, NULL);
    if (myErr == noErr) {
     /* OSA event successfully sent */
     /* Check whether it was successfully handled-- */
     /* get result code returned by the server's handler */
     myErr = AEGetParamPtr(&reply, keyErrorNumber, typeLongInteger,
                &returnedType, &errNumber, sizeof(errNumber),
                &actualSize);
     if ((myErr == errAEDescNotFound) || (errNumber == noErr))
       /* if keyErrorNumber does not exist or server returned noErr */
       /* then the OSA event was successfully handled--the reply OSA */
       /* event contains the result in the direct parameter */
       myErr = AEGetParamPtr(&reply, keyDirectObject, typeLongInteger,
                  &returnedType, &replyResultLongInt,
                  sizeof(replyResultLongInt), &actualSize);
     else {
       /* server returned an error, so get error string */
       myErr = AEGetParamPtr(&reply, keyErrorString, typeChar, &returnedType,
                  &errStr[1], sizeof(errStr)-1,
                  &actualSize);
       if (myErr == noErr) {
         if (actualSize > 255)
          actualSize = 255;
         errStr[0] = actualSize;
         MyDisplayError(errStr);
       }
     }
     ignoreErr = AEDisposeDesc(&reply);
    }
    else {
     /* the OSA event was not successfully dispatched, */
     /* the request timed out, the user canceled, or other error */
    }
    ignoreErr = AEDisposeDesc(&theOSAEvent);
    return (myErr);
  }

 The code in the previous code fragment first creates an OSA event with
 kArithmeticClass as the event class and kMultiplyEventID as the event ID. It
 also specifies the server of the OSA event. See Specifying a Target Address
 for information on specifying a target address and Creating an OSA Event for
 more information on creating an OSA event.

 The Multiply event shown in the previous code fragment contains two
 parameters, each specifying a number to multiply. See Adding Parameters to an
 OSA Event for examples of how to specify the parameters for the AEPutParamPtr
 function.

 After adding the parameters to the event, the code uses AESend to send the
 event. The theOSAEvent parameter of the AESend function specifies the OSA
 event to send-in this example, the Multiply event. The reply parameter
 specifies the reply OSA event.

 This example specifies kAEWaitReply in the sendMode parameter, indicating that
 the client is willing to wait for the specified time-out value (120 ticks, or
 2 seconds). The kAENeverInteract flag indicates that the server should not
 interact with the user when processing the OSA event. The sendPriority
 parameter specifies that the Multiply event is to be sent using normal
 priority. You can specify the kAEHighPriority flag, but this is not usually
 recommended.

 If you specify kAEWaitReply, a noErr result code from AESend indicates that
 the OSA event was sent successfully, not that the server has completed the
 requested action successfully. Therefore, you should find out whether a result
 code was returned from the handler by checking the reply OSA event for the
 existence of either the keyErrorNumber or keyErrorString parameter. If the
 keyErrorNumber parameter does not exist or contains the noErr result code, you
 can use AEGetParamPtr to get the parameter you are interested in from the
 reply OSA event.

 The MySendMultiplyEvent function in the previous code fragment checks the
 function result of AESend. If it is noErr, MySendMultiplyEvent checks the
 keyErrorNumber parameter of the reply OSA event to determine whether the
 server successfully handled the OSA event. If this parameter exists and
 indicates that an error occurred, MySendMultiplyEvent gets the error string
 out of the keyErrorString parameter; otherwise, the server performed the
 request, and the reply OSA event contains the answer to the multiplication
 request.

 When you have finished using the OSA event specified in the AESend function
 and no longer need the reply OSA event, you must dispose of both the original
 event and the reply by calling the AEDisposeDesc function.

 Important:  If your application sends OSA events to itself using a typePID
 address descriptor record set to kCurrentProcess, the OSA Event Manager jumps
 directly to the appropriate OSA event handler without going through the normal
 event-processing sequence. For this reason, your application will not appear
 to run more slowly when it sends OSA events to itself. For more information,
 see Addressing an OSA Event for Direct Dispatching.

 If the kAEHighPriority flag is specified in the sendPriority parameter of the
 AESend method, the OSA Event Manager spawns a thread and uses the
 WinSendMessage function to deliver the event to the target process. This has
 the effect of by-passing the target process's message queue.


ΓòÉΓòÉΓòÉ 6.2.1. Dealing with Time-Outs ΓòÉΓòÉΓòÉ

When your application calls AESend and chooses to wait for the server
application to handle the OSA event, it can also specify the maximum amount of
time it is willing to wait for a response. You can specify a time-out value in
the timeOutInTicks parameter to AESend. You can either specify a particular
length of time, in ticks, that your application is willing to wait, or you can
specify the kNoTimeOut constant or the kAEDefaultTimeout constant.

Use the kNoTimeOut constant to indicate that your application is willing to
wait forever for a response from the server. You should use this value only if
you are sure that the server will respond in a reasonable amount of time. You
should also implement a method of checking whether the user wants to cancel.

Use the kAEDefaultTimeout constant if you want the OSA Event Manager to use a
default time-out value. The OSA Event Manager uses a time-out value of about
one minute if you specify this constant.

If you set the kAEWaitReply flag and the server does not have a handler for the
OSA event, the server immediately returns the errAEEventNotHandled result code.
If the server does not respond within the length of time specified by the
time-out value, AESend returns the errAETimeout result code and a reply OSA
event that contains no data. This result code does not necessarily mean that
the server failed to perform the requested action; it means only that the
server did not complete processing within the specified time. The server might
still be processing the OSA event, and it might still send a reply.

If the server finishes processing the OSA event sometime after the time
specified in the keyTimeoutAttr attribute has expired, it returns a reply OSA
event to AEProcessOSAEvent. The OSA Event Manager then adds the actual data to
the reply. Thus, your application can continue to check the reply OSA event to
see if the server has responded, even after the time expires. If the server has
not yet sent the reply when the client attempts to extract data from the reply
OSA event, the OSA Event Manager functions return the errAEReplyNotArrived
result code. After the reply OSA event returns from the server, the client can
extract the data in the reply.

Additionally, the server can examine the keyTimeoutAttr attribute of the OSA
event to determine the time-out value specified by the client. You can use the
value of this attribute as a rough estimate of how much time your handler has
to respond. You can assume that your handler has less time to respond than this
time-out value, because transmitting the OSA event uses some of the available
time, as does transmitting the reply OSA event back to the client, and the
event may have been in the queue for a while already.

If you set the kAENoReply or kAEQueueReply flag, the OSA Event Manager ignores
any time-out value you specify, because your application is not waiting for the
reply. An attempt by the server to examine the keyTimeoutAttr attribute in this
situation generates the error errAEDescNotFound.

If your handler needs more time than is specified in the keyTimeoutAttr
attribute, you can reset the timer by using the AEResetTimer function. This
function resets the time-out value of an OSA event to its starting value.


ΓòÉΓòÉΓòÉ 6.3. Routines for Creating and Sending OSA Events ΓòÉΓòÉΓòÉ

This section describes the basic OSA Event Manager routines that your
application can use to create OSA events, create and duplicate descriptor
records, create and add items to descriptor lists and AE records, add
parameters and attributes to OSA events, and send OSA events. The section
Routines for Responding to OSA events describes other OSA Event Manager
routines used for both responding to and creating OSA events.


ΓòÉΓòÉΓòÉ 6.3.1. Creating OSA Events ΓòÉΓòÉΓòÉ

The AECreateOSAEvent function allows you to create an OSA event.


ΓòÉΓòÉΓòÉ 6.3.2. Creating and Duplicating Descriptor Records ΓòÉΓòÉΓòÉ

The AECreateDesc function converts data into a descriptor record, and the
AEDuplicateDesc function makes a copy of a descriptor record.


ΓòÉΓòÉΓòÉ 6.3.3. Creating Descriptor Lists and AE Records ΓòÉΓòÉΓòÉ

The AECreateList function allows you to create an empty descriptor list or AE
record.


ΓòÉΓòÉΓòÉ 6.3.4. Adding Items to Descriptor Lists ΓòÉΓòÉΓòÉ

The OSA Event Manager provides three routines that allow you to add descriptor
records to any descriptor list, including an OSA event record. The AEPutPtr
function converts data specified in a buffer to a descriptor record and adds
the descriptor record to a descriptor list. The AEPutDesc function adds a
descriptor record to a descriptor list. The AEPutArray function puts the data
for an OSA event array into a descriptor list.


ΓòÉΓòÉΓòÉ 6.3.5. Adding Data and Descriptor Records to AE Records ΓòÉΓòÉΓòÉ

The OSA Event Manager provides two routines that allow you to add data and
descriptor records to AE records. The AEPutKeyPtr function takes a pointer to
data, a descriptor type, and a keyword and converts them into a
keyword-specified descriptor record that it adds to an AE record. The
AEPutKeyDesc function takes a descriptor record and a keyword and converts them
into a keyword-specified descriptor record that it adds to an AE record.


ΓòÉΓòÉΓòÉ 6.3.6. Adding Parameters and Attributes to OSA Events ΓòÉΓòÉΓòÉ

The OSA Event Manager provides four functions that allow you to add OSA event
parameters and attributes to an OSA event. The AEPutParamPtr and AEPutParamDesc
functions add parameters to a specified OSA event. The AEPutAttributePtr and
AEPutAttributeDesc functions add attributes to a specified OSA event.


ΓòÉΓòÉΓòÉ 6.3.7. Sending OSA Events ΓòÉΓòÉΓòÉ

The AESend function allows you to send an OSA event that you have previously
created with the AECreateOSAEvent function.


ΓòÉΓòÉΓòÉ 6.4. Summary of Creating and Sending OSA Events ΓòÉΓòÉΓòÉ

The following table summarizes the methods used to create and send OSA events.

ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
ΓöéFunction Name       ΓöéDescription                             Γöé
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ΓöéAECreateDesc        ΓöéConverts data into a descriptor record. Γöé
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ΓöéAECreateList        ΓöéCreates an empty descriptor list of AE  Γöé
Γöé                    Γöérecords.                                Γöé
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ΓöéAECreateOSAEvent    ΓöéCreates an OSA event with several       Γöé
Γöé                    Γöéimportant attributes but no parameters. Γöé
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ΓöéAEDuplicateDesc     ΓöéMakes a copy of a descriptor record.    Γöé
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ΓöéAEPutArray          ΓöéPuts the data for an OSA event array    Γöé
Γöé                    Γöéinto any descriptor list.               Γöé
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ΓöéAEPutAttributeDesc  ΓöéAdds a descriptor record and a keyword  Γöé
Γöé                    Γöéto an OSA event as an attribute.        Γöé
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ΓöéAEPutAttributePtr   ΓöéAdds a pointer to data, a descriptor    Γöé
Γöé                    Γöétype, and a keyword to an OSA event as  Γöé
Γöé                    Γöéan attribute.                           Γöé
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ΓöéAEPutDesc           ΓöéAdds a descriptor to any descriptor     Γöé
Γöé                    Γöélist.                                   Γöé
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ΓöéAEPutKeyDesc        ΓöéAdds a descriptor record and a keyword  Γöé
Γöé                    Γöéto an AE record as a keyword-specified  Γöé
Γöé                    Γöédescriptor record.                      Γöé
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ΓöéAEPutKeyPtr         ΓöéGets a pointer to a buffer that containsΓöé
Γöé                    Γöéthe data from a keyword-specified       Γöé
Γöé                    Γöédescriptor record.                      Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAEPutParamDesc      ΓöéAdds a descriptor record and a keyword  Γöé
Γöé                    Γöéto an OSA event as an OSA event         Γöé
Γöé                    Γöéparameter.                              Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAEPutParamPtr       ΓöéAdds a pointer to data, a descriptor    Γöé
Γöé                    Γöétype, and a keyword to an OSA event as  Γöé
Γöé                    Γöéan OSA event parameter.                 Γöé
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ΓöéAEPutPtr            ΓöéAdds data specified in a buffer to any  Γöé
Γöé                    Γöédescriptor  list as a descriptor record.Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAESend              ΓöéSends an OSA event.                     Γöé
ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ


ΓòÉΓòÉΓòÉ 7. Resolving and Creating Object Specifier Records ΓòÉΓòÉΓòÉ

This chapter describes how your application can use the OSA Event Manager and
application-defined functions to resolve object specifier records. Your
application must be able to resolve object specifier records to respond to core
and functional-area OSA events defined in the OSA Event Registry: Standard
Suites.

For example, after receiving a Get Data event that requests a table in a
document, your application can use the OSA Event Manager and
application-defined functions to parse the object specifier record in the
direct parameter, locate the requested table, and send a reply OSA event
containing the table's data back to the application that requested it.

This chapter also describes how your application can use the OSA Event Manager
to create object specifier records. If you want to factor your application for
OSA event recording, or if you want to send OSA events directly to other
applications, you need to know how to create object specifier records.

To use this chapter, you should be familiar with OSA Events and Responding to
OSA Events. The section Working with Object Specifier Records provides a
general introduction to the subject.

If you plan to create object specifier records, you should also be familiar
with Creating and Sending OSA Events. If you are factoring your application,
you should read Recording OSA Events before you write code for resolving or
creating object specifier records.

This chapter begins with an overview of the way your application works with the
OSA Event Manager to resolve object specifier records. It then describes:

     How the data in an object specifier record is organized
     How to install entries in the object accessor tables
     How to write object accessor and object callback functions
     How to create an object specifier record


ΓòÉΓòÉΓòÉ 7.1. Resolving Object Specifier Records ΓòÉΓòÉΓòÉ

If an OSA event parameter consists of an object specifier record, your handler
for the OSA event should resolve the object specifier record: that is, locate
the OSA event objects it describes. The first step is to call the AEResolve
function with the object specifier record as a parameter.

The AEResolve function performs tasks that are required to resolve any object
specifier record, such as parsing its contents, keeping track of the results of
tests, and handling memory management. When necessary, AEResolve calls
application-defined functions to perform tasks that are unique to the
application, such as locating a specific OSA event object in the application's
data structures or counting the number of OSA event objects in a container.

Note:  Object specifier records are only valid while the OSA event that
contains them is being handled. For example, if an application receives an OSA
event asking it to cut row 5 of a table, what was row 6 then becomes row 5, and
the original object specifier record that referred to row 5 no longer refers to
the same row.

The AEResolve function can call two kinds of application-defined functions.
Object accessor functions locate OSA event objects. Object callback functions
perform other tasks that only an application can perform, such as counting,
comparing, or marking OSA event objects. This section provides an overview of
the way AEResolve calls object accessor and object callback functions when it
resolves object specifier records.

Each time AEResolve calls one of your application's object accessor functions
successfully, the object accessor function should return a special descriptor
record created by your application, called a token, that identifies either an
element in a specified container or a property of a specified OSA event object.
The OSA Event Manager examines the token's descriptor type but does nothing
with the token's data. When it needs to refer to the object the token
identifies, the OSA Event Manager simply passes the token back to your
application.

Each object accessor function provided by your application should either find
elements of a given object class in a container identified by a token of a
given descriptor type or find properties of an OSA event object identified by a
token of a specified descriptor type. The OSA Event Manager uses the object
class ID and the descriptor type of the token that identifies the object's
container to determine which object accessor function to call.

It is up to you to decide how many object accessor functions you need to write
for your application. You can write one object accessor function that locates
OSA event objects of several different object classes, or you can write
separate object accessor functions for certain object classes. Similarly, you
may want to use only one descriptor type for all the tokens returned by your
object accessor functions, or you may want to use several descriptor types. The
way you define your tokens depends on the needs of your application.

You can use the AEInstallObjectAccessor function to create an object accessor
dispatch table that the OSA Event Manager uses to map requests for OSA event
objects to the appropriate object accessor function in your application. The
OSA Event Manager uses the object class of each requested object and the
descriptor type of the token that identifies the object's container to
determine which object accessor function to call. Depending on the container
hierarchy for a given object specifier record and the way your application
defines its object accessor functions, the OSA Event Manager may need to call a
series of object accessor functions to resolve the nested object specifier
records that describe an OSA event object's container. For information about
creating and using the object accessor dispatch table, see Installing Entries
in the Object Accessor Dispatch Tables.

The following figure illustrates the major steps involved in resolving an
object specifier record. The WaveWriter application shown in the following
figure receives a Get Data event whose direct parameter is an object specifier
record for a table named "Summary of Sales" in a document named "Sales Report."
The WaveWriter application's handler for the Get Data event calls the AEResolve
function with the object specifier record as a parameter. The AEResolve
function begins to parse the object specifier record. The first object accessor
function that AEResolve calls is usually the function that can identify the OSA
event object in the application's default container-the outermost container in
the container hierarchy. In the following figure, the object specifier record
for the document "Sales Report" specifies the default container, so the OSA
Event Manager calls the object accessor function in the WaveWriter application
that can locate a document in a container identified by a descriptor record of
descriptor type typeNull.

After locating the document named "Sales Report," the WaveWriter application
returns a token to the OSA Event Manager-that is, a descriptor record that
WaveWriter uses to identify the document. The OSA Event Manager examines the
descriptor type of the token but does not need to know anything about the
token's data to continue parsing the object specifier record. Next, the OSA
Event Manager calls the object accessor function that can identify a table in a
container identified by a token of descriptor type typeMyDocToken. When the OSA
Event Manager calls this object accessor function, it uses the token that
describes the document to identify the table's container. After the WaveWriter
application has located the table named "Summary of Sales" in the document
named "Sales Report," it returns a token describing that table to the OSA Event
Manager.

After your application has successfully located an OSA event object, the OSA
Event Manager disposes of all previous tokens returned during resolution of the
object specifier record for the object. The OSA Event Manager disposes of
tokens by calling either the AEDisposeDesc function or your application's token
disposal function, if you have provided one, which is an object callback
function that disposes of a token. In the previous figure, the AEResolve
function calls the WaveWriter application's token disposal function to dispose
of the token for the document after AEResolve receives the token for the table.
After the WaveWriter application has disposed of the token for the document,
the AEResolve function returns the result of the resolution-that is, the token
for the requested table-to the handler in the WaveWriter application that
originally called AEResolve.

The OSA Event Manager can complete the cycle of parsing the object specifier
record and calling the appropriate object accessor function to obtain a token
as many times as necessary to identify every container in the container
hierarchy and finish resolving an object specifier record, including disposing
of the tokens for the containers. However, one token will always be left
over-the token that identifies the requested OSA event object. After AEResolve
returns this final token and your application performs the action requested by
the OSA event, it is up to your application to dispose of the token. Your
application can do so by calling the AEDisposeToken function, which in turn
calls either AEDisposeDesc or your application's token disposal function.

You need to provide a token disposal function only if a call to AEDisposeDesc
is not sufficient by itself to dispose of a token or if you provide marking
callback functions, which are three object callback functions that allow your
application to use its own marking scheme rather than tokens when identifying
large groups of OSA event objects. Your application is not required to provide
marking callback functions.

To handle object specifier records that specify a test, your application must
provide two object callback functions: (a) an object-counting function, which
counts the number of elements of a given object class in a given container so
that the OSA Event Manager can determine how many elements it must test to find
the element or elements that meet a specified condition, and (b) an
object-comparison function, which compares one element to another element or to
a descriptor record and returns TRUE or FALSE.

Your application may also provide an error callback function that can identify
which descriptor record caused the resolution of an object specifier record to
fail. Your application is not required to provide an error callback function.

If your application resolves object specifier records without the help of the
OSA Event Manager, it must extract the equivalent descriptor records and coerce
them as necessary to get access to their data. The OSA Event Manager includes
coercion handlers for these coercions; for information about this default
coercion handling, see the table in section Writing and Installing Coercion
Handlers.

For more information about object accessor functions, see Writing Object
Accessor Functions. For more information about object callback functions, see
Writing Object Callback Functions.

The next section describes how the data in an object specifier record is
interpreted by the OSA Event Manager.


ΓòÉΓòÉΓòÉ 7.2. Descriptor Records Used in Object Specifier Records ΓòÉΓòÉΓòÉ

An object specifier record is a coerced AE record of descriptor type
typeObjectSpecifier. The data to which its data handle refers consists of four
keyword-specified descriptor records:

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ΓöéKeyword             ΓöéValue  ΓöéDescription of data              Γöé
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ΓöékeyAEContainer      Γöéform   ΓöéAn object specifier record (or inΓöé
Γöé                    Γöé       Γöésome cases a descriptor record   Γöé
Γöé                    Γöé       Γöéwith a handle whose value is     Γöé
Γöé                    Γöé       ΓöéNULL) that identifies the        Γöé
Γöé                    Γöé       Γöécontainer for the requested      Γöé
Γöé                    Γöé       Γöéobjects                          Γöé
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ΓöékeyAEDesiredClass   Γöéwant   ΓöéA four-character code for the    Γöé
Γöé                    Γöé       Γöéobject class                     Γöé
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ΓöékeyAEKeyData        Γöéseld   ΓöéData or nested descriptor recordsΓöé
Γöé                    Γöé       Γöéthat specify a property, name,   Γöé
Γöé                    Γöé       Γöéposition, range, or test,        Γöé
Γöé                    Γöé       Γöédepending on the key form        Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöékeyAEKeyForm        Γöéform   ΓöéA four-character code for the keyΓöé
Γöé                    Γöé       Γöéform                             Γöé
ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

This section describes the descriptor types and data associated with each of
these keywords. You need this information if your application resolves or
creates object specifier records.

For a summary of the descriptor types and key forms discussed in this section,
see the table in section Data Structures Used in Object Specifier Records. For
an overview of object specifier records, see Working with Object Specifier
Records.


ΓòÉΓòÉΓòÉ 7.2.1. Object Class ΓòÉΓòÉΓòÉ

The object class of the requested objects is identified by an object class ID.
The corresponding keyword-specified descriptor record takes this form:

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ΓöéKeyword             ΓöéDescriptor type     ΓöéData                Γöé
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ΓöékeyAEDesiredClass   ΓöétypeType            ΓöéObject class ID     Γöé
ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

The OSA Event Registry: Standard Suites defines constants for the standard
object class IDs.


ΓòÉΓòÉΓòÉ 7.2.2. Container ΓòÉΓòÉΓòÉ

The container for the requested objects is usually the object in which they are
located. It can be identified in one of four ways:

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ΓöéKeyword       ΓöéDescriptor type        ΓöéData                   Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöékeyAEContainerΓöétypeObjectSpecifier    ΓöéObject specifier recordΓöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé              ΓöétypeNull               ΓöéValue of data handle isΓöé
Γöé              Γöé                       ΓöéNULL. Specifies the    Γöé
Γöé              Γöé                       Γöédefault container at   Γöé
Γöé              Γöé                       Γöéthe top of the         Γöé
Γöé              Γöé                       Γöécontainer hierarchy.   Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé              ΓöétypeObjectBeingExaminedΓöéValue of data handle isΓöé
Γöé              Γöé                       ΓöéNULL. Specifies the    Γöé
Γöé              Γöé                       Γöécontainer for elements Γöé
Γöé              Γöé                       Γöéthat are tested one at Γöé
Γöé              Γöé                       Γöéa time; used only      Γöé
Γöé              Γöé                       Γöéwithin key data for keyΓöé
Γöé              Γöé                       Γöéform formTest.         Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé              ΓöétypeCurrentContainer   ΓöéValue of data handle isΓöé
Γöé              Γöé                       ΓöéNULL. Specifies a      Γöé
Γöé              Γöé                       Γöécontainer for an       Γöé
Γöé              Γöé                       Γöéelement that demarcatesΓöé
Γöé              Γöé                       Γöéone boundary in a      Γöé
Γöé              Γöé                       Γöérange. Used only withinΓöé
Γöé              Γöé                       Γöékey data for key form  Γöé
Γöé              Γöé                       ΓöéformRange.             Γöé
ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

The data that describes a container usually consists of another object
specifier record. The ability to nest one object specifier record within
another in this way makes it possible to identify a chain of containers that
fully describes the location of one or more OSA event objects.

For example, the following figure shows nested object specifier records that
specify the first row of a table named "Summary of Sales" in a document named
"Sales Report." The container specified by the object specifier record at the
bottom of the figure describes the outermost container in the container
hierarchy-the container for the document "Sales Report."

Because a container must be specified for each OSA event object in a container
hierarchy, a null descriptor record (that is, a descriptor record whose
descriptor type is typeNull and whose data handle has the value NULL) is used
to specify the application's default container-the outermost container for any
container hierarchy in that application.

Note:  The format used in the previous figure and similar figures throughout
       this chapter does not show the structure of the nested object specifier
       records as they exist within an OSA event. Instead, these figures show
       what you would obtain after calling AEGetKeyDesc repeatedly to extract
       the object specifier records from an OSA event record.

When you call AEGetKeyDesc to extract a null descriptor record, the function
returns a descriptor record of type AEDesc with a descriptor type of typeNull
and a data handle whose value is 0.

 The object specifier data at the bottom of the previous figure uses a null
 descriptor record to specify the document's container-that is, the default
 container for the application. The object specifier record for the document
 identifies the document named "Sales Report"; the object specifier record for
 the table identifies the table named "Summary of Sales" in the document "Sales
 Report"; and the object specifier record for the row identifies the first row
 of the table named "Summary of Sales" in the document "Sales Report."

 An object specifier record in an OSA event parameter almost always includes
 nested object specifier records that specify the container hierarchy for the
 requested OSA event object. For the nested object specifier records shown in
 the previous figure, the relationship between each OSA event object and its
 container is always simple containment: it is located inside its container.

 In other cases, the specified container may not actually contain the requested
 OSA event object. Instead, the relationship between a container and a
 specified object can be defined differently, depending on the key form. For
 example, the key form formRelativePosition indicates that the requested object
 is before or after its container.

 Object specifier records that specify the key form formTest or formRange
 require key data that consists of several nested descriptor records, including
 additional object specifier records that identify either a group of elements
 to be tested or the boundary elements that demarcate a range. These object
 specifier records use two special descriptor types to specify containers:
 typeObjectBeingExamined, which specifies a container that changes as a group
 of elements are tested one at a time, and typeCurrentContainer, which
 specifies the container for a boundary element in a range. Both of these
 descriptor types require a data handle whose value is NULL, since they act
 much like variables whose value is supplied by the OSA Event Manager according
 to other information provided in the container hierarchy.


ΓòÉΓòÉΓòÉ 7.2.3. Key Form ΓòÉΓòÉΓòÉ

The key form indicates how the key data should be interpreted. It can be
specified by one of eight constants:

ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
ΓöéKeyword             ΓöéDescriptor type     ΓöéData                Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöékeyAEKeyForm        ΓöétypeEnumerated      ΓöéformPropertyID      Γöé
Γöé                    Γöé                    ΓöéformName            Γöé
Γöé                    Γöé                    ΓöéformUniqueID        Γöé
Γöé                    Γöé                    ΓöéformAbsolutePositionΓöé
Γöé                    Γöé                    ΓöéformRelativePositionΓöé
Γöé                    Γöé                    ΓöéformTest            Γöé
Γöé                    Γöé                    ΓöéformWhose           Γöé
Γöé                    Γöé                    ΓöéformRange           Γöé
ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

The next section describes the key data that corresponds to each key form.


ΓòÉΓòÉΓòÉ 7.2.4. Key Data ΓòÉΓòÉΓòÉ

The nature of the information provided by the key data depends both on the
specified key form and on the descriptor type of the descriptor record for the
key data. The following table summarizes these relationships for the standard
key forms.

ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
ΓöéKey form            ΓöéDescriptor type      ΓöéData                Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéformPropertyID      ΓöétypeType             ΓöéProperty ID for an  Γöé
Γöé                    Γöé                     Γöéelement's property  Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéformName            ΓöétypeChar or other    ΓöéElement's name      Γöé
Γöé                    Γöétext type            Γöé                    Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéformUniqueID        ΓöéAny appropriate type ΓöéA value that        Γöé
Γöé                    Γöé                     Γöéuniquely identifies Γöé
Γöé                    Γöé                     Γöéan object within itsΓöé
Γöé                    Γöé                     Γöécontainer or across Γöé
Γöé                    Γöé                     Γöéan application      Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéformAbsolutePositionΓöétypeLongInteger      ΓöéOffset from         Γöé
Γöé                    Γöé                     Γöébeginning (positive)Γöé
Γöé                    Γöé                     Γöéor end (negative) ofΓöé
Γöé                    Γöé                     Γöécontainer           Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé                    ΓöétypeAbsoluteOrdinal  ΓöékAEFirst            Γöé
Γöé                    Γöé                     ΓöékAEMiddle           Γöé
Γöé                    Γöé                     ΓöékAELast             Γöé
Γöé                    Γöé                     ΓöékAEAny              Γöé
Γöé                    Γöé                     ΓöékAEAll              Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéformRelativePositionΓöétypeEnumerated       ΓöékAENext kAEPrevious Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéformTest            ΓöétypeCompDescriptor   Γöé(see tables in      Γöé
Γöé                    ΓöétypeLogicalDescriptorΓöésection Key Data forΓöé
Γöé                    Γöé                     Γöéa Test)             Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéformRange           ΓöétypeRangeDescriptor  Γöé(see table in       Γöé
Γöé                    Γöé                     Γöésection Key Data forΓöé
Γöé                    Γöé                     Γöéa Range)            Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéformWhose           ΓöétypeWhoseDescriptor  Γöé(see table in       Γöé
Γöé                    Γöé                     Γöésection Handling    Γöé
Γöé                    Γöé                     ΓöéWhose Tests)        Γöé
ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

Most applications that resolve object specifier records need to support only
the key forms formPropertyID, formName, formUniqueID, formAbsolutePosition,
formRelativePosition, and formRange explicitly. You do not need to support
these key forms for all object classes; for example, words usually do not have
names, so most applications should return errAEEventNotHandled if they receive
a request for a word by name.

If your application provides an object-counting function and an
object-comparison function in addition to the appropriate object accessor
functions, the OSA Event Manager can handle formTest automatically.

The OSA Event Manager uses the key form formWhose internally to optimize
resolution of object specifier records that specify formTest. Applications that
translate tests into their own query languages need to support formWhose
explicitly. The section Handling Whose Tests describes formWhose in detail.

You can define custom key forms and the format for corresponding data for use
by your own application if necessary. If you think you need to do this, check
with the OSA Event Registrar first to find out whether existing key forms or
others still under development can be adapted to the needs of your application.

One simple kind of key form involves identifying an object on the basis of a
specified property. For example, the corresponding data for key form
formUniqueID (defined in the OSA Event Registry: Standard Suites) always
consists of a unique ID for the requested object. This ID is stored as a
property identified by the constant pID. The four-character code that
corresponds to both formUniqueID and pID is "ID  ".

If you discover that you do need to define a custom key form based on a
property, use the same four-character code for both the key form and the
associated property.

The rest of this section describes how the key data for the other key forms
shown in The previous table identifies OSA event objects.


ΓòÉΓòÉΓòÉ 7.2.4.1. Key Data for a Property ID ΓòÉΓòÉΓòÉ

The key data for formPropertyID is specified by a descriptor record of
descriptor type typeType. The OSA Event Registry: Standard Suites defines
constants for the standard property IDs.

An object specifier record for a property specifies cProperty as the object
class ID, an object specifier record for the object that contains the property
as the container, formPropertyID as the key form, and a constant such as pFont
as the key data. For example, if you were sending a Set Data event to change
the font of a word to Palatino, you could specify the data for the object
specifier record in the direct parameter as follows:

ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
ΓöéKeyword             ΓöéDescriptor type     ΓöéData                Γöé
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ΓöékeyAEDesiredClass   ΓöétypeType            ΓöécProperty           Γöé
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ΓöékeyAEContainer      ΓöétypeObjectSpecifier ΓöéObject specifier    Γöé
Γöé                    Γöé                    Γöérecord for word to  Γöé
Γöé                    Γöé                    Γöéwhich property      Γöé
Γöé                    Γöé                    Γöébelongs             Γöé
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ΓöékeyAEKeyForm        ΓöétypeEnumerated      ΓöéformPropertyID      Γöé
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ΓöékeyAEKeyData        ΓöétypeType            ΓöépFont               Γöé
ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

In this example, the Set Data OSA event parameter identified by the keyword
keyAETheData would specify Palatino as the value to which to set the specified
property. The reply OSA event for a subsequent Get Data event that included an
object specifier record for the same property would return Palatino in the
parameter identified by the keyword keyAEResult.


ΓòÉΓòÉΓòÉ 7.2.4.2. Key Data for an Object's Name ΓòÉΓòÉΓòÉ

The key data for formName is specified by a descriptor record whose data
consists of text, with a descriptor type such as typeChar.

The figure in section Container includes two object specifier records that
specify formName.


ΓòÉΓòÉΓòÉ 7.2.4.3. Key Data for a Unique ID ΓòÉΓòÉΓòÉ

The key data for formUniqueID consists of a value that identifies an object.
This ID must be unique either within the container, at a minimum, or unique
across the application. A unique ID can be specified by a descriptor record of
any appropriate type; for example, type typeInteger.


ΓòÉΓòÉΓòÉ 7.2.4.4. Key Data for Absolute Position ΓòÉΓòÉΓòÉ

The key data for formAbsolutePosition consists of an integer that specifies
either an offset or an ordinal position. For descriptor type typeLongInteger,
the data is either a positive integer, indicating the offset of the requested
element from the beginning of the container, or a negative integer, indicating
its offset from the end of the container. The first object specifier record
shown in the figure in section Container specifies formAbsolutePosition with
key data that consists of the positive integer 1.

For descriptor type typeAbsoluteOrdinal, the data consists of one of these
constants:

 Constant       Meaning
 kAEFirst       First element in the specified container
 kAEMiddle      Element in the middle of the specified container
 kAELast        Last element in the specified container
 kAEAny         Single element chosen at random from the specified container
 kAEAll         All the elements in the specified container

 If an object specifier record specifies kAEMiddle and the number of elements
 in the container is even, the OSA Event Manager rounds down; for example, the
 second word would be the "middle" word in a range of four words.


ΓòÉΓòÉΓòÉ 7.2.4.5. Key Data for Relative Position ΓòÉΓòÉΓòÉ

The key data for formRelativePosition is specified by a descriptor record of
type typeEnumerated whose data consists of one of these constants:

 Constant       Meaning
 kAENext        OSA event object after the specified container
 kAEPrevious    OSA event object before the specified container

 The container can be a single OSA event object or a group of OSA event
 objects; the requested elements are located immediately before or immediately
 after it, not inside it.

 If your application can locate objects of the same class by absolute position,
 it can easily locate the same objects by relative position. For example, all
 applications that support formAbsolutePosition can easily locate the table
 immediately after a container specified as another table named "Summary of
 Sales."

 Some applications may also be able to locate an object of one class before or
 after an object of another class. For example, a word processor might be able
 to locate the paragraph immediately after a container specified as a table
 named "Summary of Sales."


ΓòÉΓòÉΓòÉ 7.2.4.6. Key Data for a Test ΓòÉΓòÉΓòÉ

The key data for formTest is specified by either a comparison descriptor record
or a logical descriptor record. If your application provides an object-counting
function and an object-comparison function in addition to the appropriate
object accessor functions, the OSA Event Manager can handle formTest for you.
Some applications may perform tests more efficiently by translating them into
the application's own query language. For information about handling tests
yourself, see Handling Whose Tests.

The container for objects that pass a test can be one or more OSA event
objects. The objects specified are those in the container that pass the test
specified by the key data. For example, an object specifier record can describe
"the first row in which the First Name column equals 'John' and the Last Name
column equals 'Chapman' in the table 'MyAddresses' of the database 'WaveDB.'"
To resolve such an object specifier record, the OSA Event Manager must evaluate
a logical expression that applies the logical operator AND to two separate
comparisons for each row: a comparison of the First Name column to the word
"John" and a comparison of the Last Name column to the word "Chapman."

The OSA Event Manager evaluates comparisons and logical expressions on the
basis of the information in comparison descriptor records and logical
descriptor records. A comparison descriptor record is a coerced AE record of
type typeCompDescriptor that specifies an OSA event object and either another
OSA event object or data for the OSA Event Manager to compare to the first
object. The OSA Event Manager can also use the information in a comparison
descriptor record to compare elements in a container, one at a time, either to
an OSA event object or to data. The data for a comparison descriptor record
consists of three keyword-specified descriptor records with the descriptor
types and data shown in the following table.

ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
ΓöéKey form         ΓöéDescriptor type        ΓöéData                Γöé
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ΓöékeyAECompOperatorΓöétypeType               ΓöékAEGreaterThan      Γöé
Γöé                 Γöé                       ΓöékAEGreaterThanEqualsΓöé
Γöé                 Γöé                       ΓöékAEEquals           Γöé
Γöé                 Γöé                       ΓöékAELessThan         Γöé
Γöé                 Γöé                       ΓöékAELessThanEquals   Γöé
Γöé                 Γöé                       ΓöékAEBeginsWith       Γöé
Γöé                 Γöé                       ΓöékAEEndsWith         Γöé
Γöé                 Γöé                       ΓöékAEContains         Γöé
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ΓöékeyAEObject1     ΓöétypeObjectSpecifier    ΓöéObject specifier    Γöé
Γöé                 Γöé                       Γöédata                Γöé
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Γöé                 ΓöétypeObjectBeingExaminedΓöéValue of data handleΓöé
Γöé                 Γöé                       Γöéis NULL             Γöé
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ΓöékeyAEObject2     ΓöétypeObjectSpecifier    ΓöéObject specifier    Γöé
Γöé                 Γöé                       Γöédata for object to  Γöé
Γöé                 Γöé                       Γöébe compared         Γöé
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Γöé                 ΓöétypeObjectBeingExaminedΓöéValue of data handleΓöé
Γöé                 Γöé                       Γöéis NULL             Γöé
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Γöé                 Γöéany other type (AEDesc)ΓöéData to be compared Γöé
ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

The keyword keyAEObject1 identifies a descriptor record for the element that is
currently being compared to the object or data specified by the descriptor
record for the keyword keyAEObject2. Either object can be described by a
descriptor record of type typeObjectSpecifier or typeObjectBeingExamined. A
descriptor record of typeObjectBeingExamined acts as a placeholder for each of
the successive elements in a container when the OSA Event Manager tests those
elements one at a time. The keyword keyAEObject2 can also be used with a
descriptor record of any other descriptor type whose data is to be compared to
each element in a container.

You do not have to support all the available comparison operators for all OSA
event objects; for example, the "begins with" operator probably does not make
sense for objects of type cRectangle. It is up to you to decide which
comparison operators are appropriate for your application to support, and how
to interpret them. If necessary, you can define your own custom comparison
operators. If you think you need to do this, check with the OSA Event Registrar
first to find out whether existing definitions of comparison operators or
definitions still under development can be adapted to the needs of your
application.

A logical descriptor record is a coerced AE record of type
typeLogicalDescriptor that specifies a logical expression-that is, an
expression that the OSA Event Manager evaluates to either TRUE or FALSE. The
logical expression is constructed from a logical operator (one of the Boolean
operators AND, OR, or NOT) and a list of logical terms to which the operator is
applied. Each logical term in the list can be either another logical descriptor
record or a comparison descriptor record. The OSA Event Manager short-circuits
its evaluation of a logical expression as soon as one part of the expression
fails a test. For example, if while testing a logical expression such as A AND
B AND C the OSA Event Manager discovers that A AND B is not true, it will
evaluate the expression to FALSE without testing C.

The data for a logical descriptor record consists of two keyword-specified
descriptor records with the descriptor types and data shown in the following
table.

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ΓöéKey form            ΓöéDescriptor type     ΓöéData                Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöékeyAELogicalOperatorΓöétypeEnumerated      ΓöékAEAND              Γöé
Γöé                    Γöé                    ΓöékAEOR               Γöé
Γöé                    Γöé                    ΓöékAENOT              Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöékeyAELogicalTerms   ΓöétypeAEList          ΓöéOne or more         Γöé
Γöé                    Γöé                    Γöécomparison or       Γöé
Γöé                    Γöé                    Γöélogical descriptor  Γöé
Γöé                    Γöé                    Γöérecords             Γöé
ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

If the logical operator is AND or OR, the list can contain any number of
logical terms, and the logical operator is applied to all the terms in the
list. For example, the logical descriptor data shown in the second figure below
consists of the logical operator AND and a list of logical terms that contains
two comparison descriptor records. The entire logical descriptor record
corresponds to the logical expression "the First Name column equals 'John' AND
the Last Name column equals 'Chapman.'" If the logical operator is NOT, the
list must contain a single term.

The following figure shows four object specifier records that specify the
container hierarchy for the first row in the table "MyAddresses" of the
database "WaveDB" that meets a test. The object specifier record at the top of
the following figure specifies the first row contained in the set of rows that
form its container. The container for the first row is specified by an object
specifier record for a set of rows that meet a test. The two object specifier
records at the bottom of the following figure specify the table named
"MyAddresses," which contains the rows to be tested, in the database named
"WaveDB."

The object specifier record in the previous figure for a set of rows that meet
a test specifies formTest. The corresponding key data consists of the logical
descriptor record shown in the following figure, which applies the logical
operator AND to two logical terms: a comparison descriptor record that
specifies all the rows in the container (the table "MyAddresses") in which the
column named "First Name" equals "John," and another comparison descriptor
record that specifies all the rows in which the column named "Last Name" equals
"Chapman." A row in the table "MyAddresses" passes the test only if both
comparison descriptor records evaluate as TRUE.

The keyword-specified descriptor records with the keyword keyAEObject1 in the
previous figure each consist of an object specifier record that identifies a
column by name. The row for each column is specified by a descriptor record of
typeObjectBeingExamined, which acts as a placeholder for each row as the OSA
Event Manager tests successive rows in the table. The OSA event object
specified by each of these object specifier records consists of a column in the
row. The OSA Event Manager (with the help of an object-comparison function)
compares the contents of the column in successive rows to the string identified
by the keyword keyAEObject2 using the comparison operator identified by the
keyword keyAECompOperator.


ΓòÉΓòÉΓòÉ 7.2.4.7. Key Data for a Range ΓòÉΓòÉΓòÉ

The key data for formRange is specified by a range descriptor record, which is
a coerced AE record of type typeRangeDescriptor i1.typeRangeDescriptor
descriptor type that identifies two OSA event objects marking the beginning and
end of a range of elements. The data for a range descriptor record consists of
two keyword-specified descriptor records with the descriptor types and data
shown in the following table.

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ΓöéKeyword             ΓöéDescriptor type     ΓöéData                Γöé
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ΓöékeyAERangeStart     ΓöétypeObjectSpecifier ΓöéAn object specifier Γöé
Γöé                    Γöé                    Γöérecord for the firstΓöé
Γöé                    Γöé                    ΓöéOSA event object in Γöé
Γöé                    Γöé                    Γöéthe desired range   Γöé
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ΓöékeyAERangeStop      ΓöétypeObjectSpecifier ΓöéAn object specifier Γöé
Γöé                    Γöé                    Γöérecord for the last Γöé
Γöé                    Γöé                    ΓöéOSA event object in Γöé
Γöé                    Γöé                    Γöéthe desired range   Γöé
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The elements that identify the beginning and end of the range, which are known
as boundary objects, do not have to belong to the same object class as the
elements in the range itself. If the boundary objects belong to the same object
class as the elements in the range, the boundary objects are included in the
range. For example, the range of tables specified by boundary elements that are
also tables would include the two boundary tables.

The container for boundary objects is usually the same as the container for the
entire range, in which case the container for a boundary object can be
specified by a placeholder-that is, a descriptor record of type
typeCurrentContainer whose data handle has the value NULL.

When AEResolve calls an object accessor function to locate a range of objects,
the OSA Event Manager replaces the descriptor record of type
typeCurrentContainer with a token for the container of each boundary object.
When using AEResolve to resolve the object specifier record, your application
does not need to examine the contents of this token, because the OSA Event
Manager keeps track of it. If your application attempts to resolve some or all
of the object specifier record without calling AEResolve, the application may
need to examine the token before it can locate the boundary objects. The token
provided by the OSA Event Manager for a boundary object's container is a
descriptor record of type typeToken whose data handle refers to a structure of
type ccntTokenRecord.


typedef struct _ccntTokenRecord {
DescType   tokenClass;     /*Class ID of the container represented by */
                /* the token*/
AEDesc    token;       /*Token for the current container*/
} ccntTokenRecord;

This data type is of interest only if you attempt to resolve an object
specifier record for a range without calling AEResolve. Otherwise, the OSA
Event Manager keeps track of the container.


ΓòÉΓòÉΓòÉ 7.3. Installing Entries in the Object Accessor Dispatch Tables ΓòÉΓòÉΓòÉ

If the direct parameter for an OSA event consists of an object specifier
record, your handler for the event should call the AEResolve function to
resolve the object specifier record: that is, to find the OSA event objects or
properties it describes. The AEResolve function resolves the object specifier
record with the help of object accessor functions provided by your application.
Your application installs entries for its object accessor functions in an
object accessor dispatch table, which is used by the OSA Event Manager to map
requests for OSA event objects or their properties to the appropriate object
accessor functions.

After being called by AEResolve, an object accessor function should return a
token that identifies (in whatever manner is appropriate for your application)
the specified OSA event object or property. An object accessor function also
returns a result code that indicates whether it found the OSA event object or
property. The token, which is a descriptor record of data type AEDesc, can be
of any descriptor type, including descriptor types you define yourself. For an
overview of the way AEResolve works with your application's object accessor
functions to locate OSA event objects, see Resolving Object Specifier Records.

Each object accessor function provided by your application should either find
elements of a specified object class contained in an OSA event object
identified by a token of a specified descriptor type, or find properties of an
OSA event object identified by a token of a specified descriptor type. To
determine which object accessor function to dispatch, the OSA Event Manager
uses the object class ID specified in an object specifier record and the
descriptor type of the token that identifies the requested object's container.
For object accessor functions that find properties, you should specify the
object class ID as the constant cProperty.

To install entries in your application's object accessor dispatch table, use
the AEInstallObjectAccessor function. For each object class and property your
application supports, you should install entries that specify:

     The object class of the requested OSA event object or property

     The descriptor type of the token used to identify the container for the
      requested OSA event object or property

     The address of the object accessor function that finds objects or
      properties of the specified object class in containers described by
      tokens of the specified descriptor type

     A reference constant

 You provide this information in the desiredClass, containerType, theAccessor,
 and accessorRefcon parameters to the AEInstallObjectAccessor function.

 The system object accessor dispatch table is a table that contains object
 accessor functions available to all processes running on the same computer.
 The object accessor functions in your application's object accessor dispatch
 table are available only to your application. If AEResolve cannot find an
 object accessor function for the OSA event object class in your application's
 object accessor dispatch table, it looks in the system object accessor
 dispatch table. If it does not find an object accessor function there either,
 it returns the result code errAEAccessorNotFound.

 If AEResolve successfully calls the appropriate object accessor function in
 either the application object accessor dispatch table or the system object
 accessor dispatch table, the object accessor function returns a token and
 result code. The AEResolve function uses the token and result code to continue
 resolving the object specifier record. If, however, the token identifies the
 final OSA event object or property in the container hierarchy, AEResolve
 returns the token for the final resolution in the theToken parameter.

 If the AEResolve function calls an object accessor function in the system
 object accessor dispatch table, your OSA event handler may not recognize the
 descriptor type of the token returned by the function. If this happens, your
 handler should attempt to coerce the token to an appropriate descriptor type.
 If coercion fails, return the result code errAEUnknownObjectType. When your
 handler returns this result code, the OSA Event Manager attempts to locate a
 system OSA event handler that can recognize the token.

 It is up to you to decide how many object accessor functions you need to write
 and install for your application. You can install one object accessor function
 that locates OSA event objects of several different object classes, or you can
 write separate object accessor functions for certain object classes.
 Similarly, you may want to use only one descriptor type for all the tokens
 returned by your object accessor functions, or you may want to use several
 descriptor types. The sections that follow provide examples of alternative
 approaches.

 For more information about object accessor functions, see Writing Object
 Accessor Functions.


ΓòÉΓòÉΓòÉ 7.3.1. Installing Object Accessor Functions That Find OSA Event Objects ΓòÉΓòÉΓòÉ

The following code fragment demonstrates how to add entries to your
application's object accessor dispatch table for the object class cText and
three of its element classes: the object classes cWord, cItem, and cChar. In
this example, the container for each of these object classes is identified by a
token that consists of a descriptor record of descriptor type typeMyText.

myErr = AEInstallObjectAccessor(cText, typeMyText,
                (OSLAccessorUPP)&MyFindTextObjectAccessor,
                0, FALSE);
if (myErr != noErr)  DoError(myErr);

myErr = AEInstallObjectAccessor(cWord, typeMyText,
                (OSLAccessorUPP)&MyFindWordObjectAccessor,
                0, FALSE);
if (myErr != noErr)  DoError(myErr);

myErr = AEInstallObjectAccessor(cItem, typeMyText,
                (OSLAccessorUPP)&MyFindItemObjectAccessor,
                0, FALSE);
if (myErr != noErr)  DoError(myErr);

myErr = AEInstallObjectAccessor(cChar, typeMyText,
                (OSLAccessorUPP)&MyFindCharObjectAccessor,
                0, FALSE);
if (myErr != noErr)  DoError(myErr);

The first call to AEInstallObjectAccessor in the previous code fragment adds an
entry to the application's object accessor dispatch table. This entry indicates
that the AEResolve function should call the MyFindTextObjectAccessor function
when resolving any OSA event object with the cText object class and a container
identified by a token of descriptor type typeMyText. The other calls to
AEInstallObjectAccessor in the previous code fragment add entries for OSA event
objects of object classes cWord, cItem, and cChar in a container identified by
a token of descriptor type typeMyText. For example, because all the entries
created by the code in the previous code fragment specify the descriptor type
typeMyText for the token that identifies the container, the AEResolve function
calls the MyFindWordObjectAccessor function to locate a requested word
regardless of whether the container for the word is a run of text, another
word, a paragraph, or an item.

The accessorRefcon parameter for the AEInstallObjectAccessor function specifies
a reference constant passed to your handler by the OSA Event Manager each time
AEResolve calls your object accessor function. Your application can use this
reference constant for any purpose. If your application does not use the
reference constant, you can use 0 as the value, as shown in the previous code
fragment.

If you add an object accessor function to the system object accessor dispatch
table, the function that you specify must reside in a DLL. If there was already
an entry in the system object accessor dispatch table for the same object class
and container descriptor type, that entry is replaced unless you chain it to
your system handler. You can do this the same way you chain a previously
installed system OSA event handler to your own system handler. See the
description of AEInstallEventHandler for details.

The code shown in the previous code fragment installs a separate object
accessor function for each object class, even though the code specifies the
same descriptor type for tokens that identify the containers for OSA event
objects of each class. Most word-processing applications can specify the same
object accessor function as well as the same token descriptor type for OSA
event objects of these four classes, in which case the code shown in the
previous code fragment can be altered as shown in the following code fragment.

myErr = AEInstallObjectAccessor(cText, typeMyText,
                (OSLAccessorUPP)MyFindTextObjectAccessor,
                0, FALSE);
if (myErr != noErr)  DoError(myErr);

myErr = AEInstallObjectAccessor(cWord, typeMyText,
                (OSLAccessorUPP)MyFindTextObjectAccessor,
                0, FALSE);
if (myErr != noErr)  DoError(myErr);

myErr = AEInstallObjectAccessor(cItem, typeMyText,
                (OSLAccessorUPP)MyFindTextObjectAccessor,
                0, FALSE);
if (myErr != noErr)  DoError(myErr);

myErr = AEInstallObjectAccessor(cChar, typeMyText,
                (OSLAccessorUPP)MyFindTextObjectAccessor,
                0, FALSE);
if (myErr != noErr)  DoError(myErr);

In some situations, you may want to write different object accessor functions
to locate OSA event objects of the same object class in containers identified
by tokens of different descriptor types. For example, the code in the following
code fragment installs two different object accessor functions: one that finds
a word in a container identified by a token of type typeMyTextToken, and one
that finds a word in a container identified by a token of
typeMyGraphicTextToken.

myErr = AEInstallObjectAccessor(cWord, typeMyTextToken,
                (OSLAccessorUPP)&MyFindTextObjectAccessor,
                0, FALSE);
if (myErr != noErr)  DoError(myErr);

myErr = AEInstallObjectAccessor(cWord, typeMyGraphicTextToken,
                (OSLAccessorUPP)&MyFindGrphcTextObjectAccessor,
                0, FALSE);
if (myErr != noErr)  DoError(myErr);

Every application must provide one or more object accessor functions that can
find OSA event objects in the default container, which is always identified by
a token of descriptor type typeNull. The following code fragment demonstrates
how to add entries to your application's object accessor dispatch table for the
object classes cWindow and cDocument. The container for each of these classes
is identified by a token of descriptor type typeNull, which specifies an
application's default container.

myErr = AEInstallObjectAccessor(cWindow, typeNull,
                (OSLAccessorUPP)&MyFindWindowObjectAccessor,
                0, FALSE);
if (myErr != noErr)  DoError(myErr);

myErr = AEInstallObjectAccessor(cDocument, typeNull,
                (OSLAccessorUPP)&MyFindDocumentObjectAccessor,
                0, FALSE);
if (myErr != noErr)  DoError(myErr);

For any entry in your object accessor dispatch table, you can specify a
wildcard value for the object class, for the descriptor type of the token used
to identify the container, or for both. You specify a wildcard by supplying the
typeWildCard constant when installing an entry into the object accessor
dispatch table. A wildcard value matches all possible values.

If an object accessor dispatch table contains one entry for a specific object
class and a specific token descriptor type, and another entry that is identical
except that it specifies a wildcard value for either the object class or the
token descriptor type, the OSA Event Manager dispatches the more specific
entry. For example, if an object accessor dispatch table includes one entry
that specifies the object class as cWord and the token descriptor type as
typeMyTextToken, and another entry that specifies the object class as cWord and
the token descriptor type as typeWildCard, the OSA Event Manager dispatches the
object accessor function associated with the entry that specifies
typeMyTextToken.

If you specify typeWildCard as the desiredClass parameter and typeMyToken as
the containerType second parameter for the AEInstallObjectAccessor function and
no other entry in the dispatch table matches more exactly, the OSA Event
Manager calls the object accessor function that you specify in the theAccessor
parameter when resolving OSA event objects of any object class in containers
identified by tokens of the typeMyToken descriptor type.

If you specify cText as the desiredClass parameter and typeWildCard as the
containerType parameter for the AEInstallObjectAccessor function and no other
entry in the dispatch table matches more exactly, the OSA Event Manager calls
the object accessor function that you specify in the theAccessor parameter when
resolving OSA event objects of the object class cText in containers identified
by tokens of any descriptor type.

If you specify typeWildCard for both the desiredClass and containerType
parameters of the AEInstallObjectAccessor function and no other entry in the
dispatch table matches more exactly, the OSA Event Manager calls the object
accessor function that you specify in the theAccessor parameter when resolving
OSA event objects of any object class in containers identified by tokens of any
descriptor type.

Once the OSA Event Manager finds a matching entry, whether exact or involving
type typeWildCard, that is the only object accessor function it calls for that
object class and token descriptor type. If that function fails, the OSA Event
Manager will not look for another matching entry in the same table.


ΓòÉΓòÉΓòÉ 7.3.2. Installing Object Accessor Functions That Find Properties ΓòÉΓòÉΓòÉ

The OSA event object to which a property belongs is that property's container.
You should add entries to your application's object accessor dispatch table
that specify object accessor functions for finding properties in containers
identified by tokens of various descriptor types. Object specifier records do
not specify a property's specific object class; instead, they specify the
constant cProperty as the class ID for any property. Similarly, you should
specify the constant cProperty as the object class for an object accessor
function that can find any property of a container identified by a token of a
given descriptor type. If you need to install different object accessor
routines for finding properties of OSA event objects that belong to different
object classes, you must use different descriptor types for the tokens that
represent those OSA event objects.

For example, to specify an object accessor function that locates properties of
OSA event objects identified by tokens of descriptor type typeMyToken, you can
add a single entry to the object accessor dispatch table:


myErr = AEInstallObjectAccessor(cProperty, typeMyToken,
                (OSLAccessorUPP)MyFindPropertyObjectAccessor,
                0, FALSE);
if (myErr)
  DoError(myErr);

The code in this example adds an object accessor function to the application's
object accessor dispatch table that can find any property of any container
identified by a token of descriptor type typeMyToken. If the typeMyToken
parameter were specified as typeWildCard, the MyFindPropertyObjectAccessor
function would have to be capable of finding any property of any OSA event
object in your application except for those found by handlers with more
specific entries in the object accessor dispatch table.


ΓòÉΓòÉΓòÉ 7.4. Writing Object Accessor Functions ΓòÉΓòÉΓòÉ

If the direct parameter for an OSA event consists of an object specifier
record, your handler for the event should call the AEResolve function to
resolve the object specifier record: that is, to find the OSA event objects or
properties it describe. The AEResolve function resolves object specifier
records with the help of object accessor functions provided by your
application. For an overview of the way AEResolve works with your application's
object accessor functions to locate OSA event objects, see Resolving Object
Specifier Records.

This section describes how to write object accessor functions. You need to read
this section if your application supports the Core suite or any of the
functional-area suites in the OSA Event Registry: Standard Suites.

Your application should provide object accessor functions that can find OSA
event objects and their properties for all object classes supported by your
application, including their corresponding properties and element classes.
Because the OSA Event Manager dispatches object accessor functions according to
the class ID of the requested OSA event object and the descriptor type of the
token that identifies its container, you have a great deal of flexibility in
deciding what object accessor functions you need to write for your application.
The installation and dispatching of object accessor functions are described in
Installing Entries in the Object Accessor Dispatch Tables.

For example, if your application is a word processor, one object accessor
function will probably work equally well for OSA event objects of object
classes cParagraph, cItem, and cWord located in containers identified by tokens
of descriptor type myTextToken. If you use a single descriptor type for tokens
that identify any containers in which objects of these three object classes can
be found, you can dispatch requests for all such elements to the same object
accessor function. However, the same word processor might use one descriptor
type for tokens identifying containers of class cCell and another descriptor
type for tokens identifying containers of class cColumn-in which case it would
need an object accessor function for each descriptor type.

For each object class that your application supports, your application should
also provide one object accessor function that can find all the properties of
that object class, or one object accessor function that can find all the
properties of several object classes.

Here is the declaration for a sample object accessor function:


OSErr MyObjectAccessor (DescType desiredClass, const AEDesc *containerToken,
            DescType containerClass, DescType keyForm,
            const AEDesc *keyData, AEDesc *theToken,
            long *theRefCon)

The AEResolve function passes the following information to your object accessor
function: the object class ID of the requested OSA event objects, the object
class of their container, a token that identifies the specific container in
which to look for them, the key form and key data that specify how to locate
them, and the reference constant associated with the object accessor function.
Your object accessor function uses this information to locate the requested
objects.

Most applications that resolve object specifier records need to support only
the key forms formPropertyID, formName, formUniqueID, formAbsolutePosition,
formRelativePosition, and formRange explicitly. You do not need to support
these key forms for all object classes; for example, words usually do not have
names, so most applications should return errAEEventNotHandled if they receive
a request for a word by name.

If your application provides an object-counting function and an
object-comparison function in addition to the appropriate object accessor
functions, the OSA Event Manager can handle formTest automatically.

The OSA Event Manager uses the key form formWhose internally to optimize
resolution of object specifier records that specify formTest. Only applications
that translate tests into their own query languages need to support formWhose
explicitly. The section Handling Whose Tests describes formWhose in detail.

If your object accessor function successfully locates the requested OSA event
objects, your application should return the noErr result code and a token that
identifies them. The token can be of any descriptor type, as long as it is a
descriptor record. For example, to identify a file, your application might use
a descriptor record of descriptor type typeOS2FileName. To identify an open
document, your application might define its own descriptor type, such as
typeMyDocToken, for a descriptor record whose data handle refers to a pointer
to a document record. For more information about tokens, see Defining Tokens.

Important:  Object accessor functions must not have side effects that change
the number or order of elements in a container while an object specifier record
is being resolved. If the number of elements in a container is changed during
the resolution of an object specifier record, the OSA Event Manager may not be
able to locate all the elements.


ΓòÉΓòÉΓòÉ 7.4.1. Writing Object Accessor Functions That Find OSA Event Objects ΓòÉΓòÉΓòÉ

The first three listings in this section demonstrate how to write three object
accessor functions that might be called in the following situation: An
application receives a Get Data event with a direct parameter that consists of
an object specifier record for the first word in the third paragraph of a
document. The application's handler for the Get Data event calls the AEResolve
function to resolve the object specifier record. The AEResolve function first
calls the application's object accessor function for objects of class cDocument
in containers identified by a token of descriptor type typeNull.

The AEResolve function passes these values to the MyFindDocumentObjectAccessor
function shown in the following code fragment: in the desiredClass parameter,
the constant cDocument; in the containerToken parameter, a descriptor record of
descriptor type typeNull with a data handle whose value is NULL; in the
containerClass parameter, the constant typeNull; in the keyForm parameter, the
constant formName; in the keyData parameter, a descriptor record of descriptor
type typeText whose data consists of the string "MyDoc"; and the reference
constant specified in the application's object accessor dispatch table.

OSErr MyFindDocumentObjectAccessor (DescType desiredClass,
                  const AEDesc *containerToken,
                  DescType containerClass, DescType keyForm,
                  const AEDesc *keyData, AEDesc *theToken,
                  long *theRefCon)
{

  char    docName[NAMESIZE];
  Size    actSize;
  BOOL    foundDoc;
  Document  *foundDocRecPtr;

  switch (keyForm) {
    case formName:
     /* get the name of the document from the key data */
     MyGetStringFromDesc(keyData, docName, &actSize);
     /* look for a document with the given name by */
     /* searching all document records */
     MySearchDocRecs(docName, foundDocRecPtr, &foundDoc);
     if (!foundDoc) {
       return (kObjectNotFound);
     }
     else {
       /* create token that identifies the document */
       myErr = AECreateDesc(typeMyDocToken, &foundDocRecPtr,
                 sizeof(foundDocRecPtr), &token);
       return (myErr);
     }
     break;

    default:
     /* handle the other key forms you support */
     return (kKeyFormNotSupported);
     break;
  }
}

The MyFindDocumentObjectAccessor function uses the information in the keyForm
and keyData parameters to find the specified document. If it finds the OSA
event object, MyFindDocumentObjectAccessor returns a token of descriptor type
typeMyDocToken to AEResolve. The data handle for this token refers to a pointer
to a document record (see the figure in section Defining Tokens). The
MyFindDocumentObjectAccessor function returns this token and the noErr result
code to the AEResolve function.

In the Get Data example, the token returned to AEResolve by the
MyFindDocumentObjectAccessor function identifies the document "MyDoc." The
AEResolve function then calls the application's object accessor function for
objects of class cParagraph in containers identified by a token of descriptor
type typeMyDocToken.

In this case, AEResolve passes these values to the MyFindParaObjectAccessor
function shown in the following code fragment: in the desiredClass parameter,
the constant cParagraph; in the containerToken parameter, the token returned by
the MyFindDocumentObjectAccessor function; in the containerClass parameter, the
constant cDocument; in the keyForm parameter, the constant
formAbsolutePosition; in the keyData parameter, a descriptor record with the
typeLongInteger descriptor type and data that consists of the value 3
(indicating the third paragraph); and the reference constant specified in the
application's object accessor dispatch table.

OSErr MyFindParaObjectAccessor (DescType desiredClass,
                const AEDesc *containerToken,
                DescType containerClass, DescType keyForm,
                const AEDesc *keyData, AEDesc *theToken,
                long *theRefCon)
{
   long        index;
   /*MyFoundTextRecord is an application-defined data type */
   /* consisting of three fields: start, ending, and docPtr*/
   MyFoundTextRecord  foundParaRec;
   long        foundParaStart;
   long        foundParaEnd;
   Document      *foundDocRecPtr;
   BOOL        success;

   switch (keyForm) {
    case formAbsolutePosition:
      /*get the index of the paragraph from the key data*/
      MyGetIndexFromDesc(keyData, index);
      /*get the desired paragraph by index*/
      success = MyGetPara(index, containerToken, foundParaStart,
                foundParaEnd, foundDocRecPtr);
     if (!success)
       return (kObjectNotFound);
     else {  /* create token that identifies the paragraph */
       foundParaRec.start = foundParaStart;
       foundParaRec.ending = foundParaEnd;
       foundParaRec.docPtr = *foundDocRecPtr;
       myErr = AECreateDesc(typeMyTextToken, &foundParaRec,
                 sizeof(foundParaRec), &token);
       return (myErr);
     }
     break;

    default:
     /* handle the other key forms you support */
     return (kKeyFormNotSupported);
     break;
   }
}

The MyFindParaObjectAccessor function uses another application-defined
function, MyGetPara, to search the data structures associated with the document
and find the desired paragraph. If it finds the paragraph, MyGetPara returns a
value that identifies the beginning of the paragraph, a value that identifies
the end of the paragraph, and a pointer to the document (which MyGetPara gets
from the containerToken parameter). The MyFindParaObjectAccessor function
returns an application-defined token that contains this information. This token
is of descriptor type typeMyTextToken; it describes a range of characters that
can be used to identify any range of text, including a paragraph or a word. The
MyFindParaObjectAccessor function returns this token and the noErr result code
to the AEResolve function.

In the Get Data example, the token returned to AEResolve by the
MyFindParaObjectAccessor function identifies the third paragraph in the
document "MyDoc." The AEResolve function then calls the application's object
accessor function for objects of class cWord in containers identified by a
token of descriptor type typeMyTextToken.

In this case, the AEResolve function passes these values to the
MyFindWordObjectAccessor function shown in the following code fragment: in the
desiredClass parameter, the constant cWord; in the containerToken parameter,
the token returned by the MyFindParaObjectAccessor function (a token of
descriptor type typeMyTextToken that identifies a paragraph); in the
containerClass parameter, the constant cParagraph; in the keyForm parameter,
the constant formAbsolutePosition; in the keyData parameter, a descriptor
record with the typeLongInteger descriptor type and data that consists of the
value 1 (indicating the first word); and the reference constant specified in
the application's object accessor dispatch table.

The MyFindWordObjectAccessor function uses another application-defined
function, MyGetWord, to search the paragraph to find the desired word. If it
finds the word, MyGetWord returns a value that identifies the beginning of the
word, a value that identifies the end of the word, and a pointer to the
document (which MyGetWord gets from the containerToken parameter). The
MyFindWordObjectAccessor function returns a token that contains this
information. This token is also of descriptor type typeMyTextToken; in this
case, the token identifies a specific word. The MyFindWordObjectAccessor
function returns this token and the noErr result code to the AEResolve
function, which in turn returns the token to the Get Data event handler that
originally called AEResolve.

OSErr MyFindWordObjectAccessor (DescType desiredClass,
                const AEDesc *containerToken,
                DescType containerClass, DescType keyForm,
                const AEDesc *keyData, AEDesc *theToken,
                long *theRefCon)
{
  long        index;
  MyFoundTextRecord  foundWordRec;
  long        foundWordStart;
  long        foundWordEnd;
  Document      *foundDocRecPtr;
  BOOL        success;

  switch (keyForm) {
    case formAbsolutePosition:
     /*get the index of the word from the key data*/
     MyGetIndexFromDesc(keyData, index);
     /*get the desired word by index*/
     success = MyGetWord(index, containerToken, foundWordStart,
               foundWordEnd, foundDocRecPtr);
     if (!success)
       return (kObjectNotFound);
     else {
       /*create token that identifies the paragraph*/
       foundWordRec.start = foundWordStart;
       foundWordRec.ending = foundWordEnd;
       foundWordRec.docPtr = *foundDocRecPtr;
       myErr = AECreateDesc(typeMyTextToken, &foundWordRec,
                 sizeof(foundWordRec), &token);
     }
     break;
    default:
     /*handle the other key forms you support*/
     return (kKeyFormNotSupported);
  }
}

The first code fragment in this section shows an object accessor function that
locates a document in the default container. Every application must provide one
or more object accessor functions that can find OSA event objects in the
default container, which is always identified by a descriptor record of
descriptor type typeNull. The following code fragment provides another example
of an object accessor function that locates an OSA event object in the default
container. If the MyFindWindowObjectAccessor function shown in the following
code fragment were installed in an application's object accessor dispatch
table, the AEResolve function would call it as necessary to locate an object of
class cWindow in a container identified by a token of descriptor type typeNull.


OSErr APIENTRY MyFindWindowObjectAccessor(DescType desiredClass,
                     const AEDesc *containerToken,
                     DescType containerClass,
                     DescType keyForm,
                     const AEDesc *keyData,
                     AEDesc *theToken,
                     long *theRefCon)
{
  OSErr myErr = noErr;
  BOOL  found = FALSE;
  CHAR  windowName[CCHMAXPATH], windowTitle[CCHMAXPATH];
  LONG  index;
  HWND  hwnd;
  Size  actualSize;

  switch(keyForm)
  {
   case formName:
     /* Find the window given a name in key data */
     /* Get the window name out of key data */
     MyGetStringFromDesc(keyData, windowName, &actualSize);
     /* look for a window with the given name */
     hwnd = MyGetFrontWindow();
     while( (hwnd != NULL) && (found == FALSE) )
     {
      MyGetWindowTitle(hwnd, windowTitle);
      if(strcmp(windowName, windowTitle) == 0)
      {
        found = TRUE;
      }
      else
      {
        hwnd = MyGetNextWindow(hwnd);
      }
     }
     break;
   case formAbsolutePosition:
     /* Find the window given an index in key data */
     /* Get the index out of key data */
     MyGetIndexFromDesc(keyData, index);
     /* look for a window with the given index */
     hwnd = MyGetFrontWindow();
     while( (hwnd != NULL) && (found == FALSE) )
     {
      MyGetWindowIndex(hwnd, &windowIndex);
      if(index == windowIndex)
      {
        found = TRUE;
      }
      else
      {
        hwnd = MyGetNextWindow(hwnd);
      }
     }
     break;
   /* Handle the other key forms you support */
   default:
     myErr = kKeyFormNotSupported;
     break;
  }

  if(myErr == noErr)
  {
   if(found)
   {
     myErr = AECreateDesc(typeMyWindow, &hwnd, sizeof(hwnd), theToken);
   }
   else
   {
     myErr = kObjectNotFound;
   }
  }
  return myErr;
}

The keyForm parameter of the MyFindWindowObjectAccessor function describes how
the function should interpret the keyData parameter. If the key form is
formName, then the key data contains the name of the window to locate. If the
key form is formAbsolutePosition, the key data contains the position of the
window to locate in the window list; for example, a value of 1 identifies the
front most window.

The MyFindWindowObjectAccessor function supports only the formName and
formAbsolutePosition key forms. Your object accessor functions should support
all key forms that make sense for the kinds of objects the functions can
locate.

For the formName keyword, the MyFindWindowObjectAccessor function starts with
the frontmost window and compares the window's title to the name specified by
the keyData parameter. It continues this search until it reaches either the end
of the window list or finds a match. If the MyFindWindowObjectAccessor function
finds a match, it uses the AECreateDesc function to create a descriptor record
for the token, specifying the application-defined typeMyWindow descriptor type
and the data for this descriptor type as a window pointer.

The MyFindWindowObjectAccessor function then sets its function result
appropriately, and the AEResolve function either returns this function result
and token, or uses the returned token to request the next OSA event object in
the container hierarchy, such as a document in the window.


ΓòÉΓòÉΓòÉ 7.4.2. Writing Object Accessor Functions That Find Properties ΓòÉΓòÉΓòÉ

The OSA event object to which a property belongs is that property's container.
Your application should provide an object accessor function for finding
properties in containers identified by tokens of various descriptor types. Your
application does not need to be given a property's specific object class in
order to find that property; instead, you can specify the object class ID for
any property with the constant cProperty. Thus, you can write a single object
accessor function that can find any property of an object identified by a token
of a given descriptor type.

To install such an object accessor function, you can add a single entry to the
object accessor dispatch table that specifies the desired object class as
cProperty for a given token descriptor type. For example, the following code
fragment shows an object accessor function that identifies any property of a
window.

OSErr MyFindPropertyOfWindowObjectAccessor (DescType desiredClass,
                       const AEDesc *containerToken,
                       DescType containerClass,
                       DescType keyForm,
                       const AEDesc *keyData,
                       AEDesc *theToken, long *theRefCon)
{

   DescType  theProperty;
   OSErr   myErr;

   myErr = noErr;
   MyGetPropFromKeyData(keyData, theProperty);
   switch (keyForm) {
    case fromPropertyID:
      switch (theProperty) {
       case pName:
         /* create token that identifies name property of the window */
         MyCreateToken(typeMyWindowProp, containerToken, pName, token);
         break;
       case pBounds:
         /* create token that identifies bounds property of the */
         /* window */
         MyCreateToken(typeMyWindowProp, containerToken, pBounds, token);
         /* create tokens for other properties as appropriate */
         break;
       default:
         myErr = kErrorPropNotFound;
         break;
      }
      break;
   default:
     myErr = kKeyFormNotSupported;
     break;
  }
  return (myErr);
}

The MyFindPropertyOfWindowObjectAccessor function takes a token that identifies
a window and creates a token that identifies the requested property of that
window. See the second figure in section Defining Tokens for an illustration of
the logical organization of a token of descriptor type typeMyWindowProp.

This simplified example merely translates information about the requested
property and the window to which it belongs into the form of a token of type
typeMyWindowProp. This token can then be used by OSA event handlers to identify
the corresponding window and its property, so that a handler can either
retrieve the value of the property (for example, a Get Data handler) or change
the value of the property (for example, a Set Data handler). Like other tokens,
a token that identifies a property should always contain a reference to the
corresponding property and the object to which it belongs-not a copy of the
data for that object's property.


ΓòÉΓòÉΓòÉ 7.4.3. Defining Tokens ΓòÉΓòÉΓòÉ

It is up to you to decide how many token descriptor types you need to define
for your application. In many cases you may be able to define one token that
can identify OSA event objects of several different object classes, such as a
token of type typeMyTextToken that identifies OSA event objects of object
classes cText, cWord, cItem, and cChar. In other cases you may need to define
specific token descriptor types for specific object classes.

For example, the MyFindDocumentObjectAccessor routine shown in the first figure
in section Writing Object Accessor Functions That Find OSA Event Objects
returns a token of descriptor type typeMyDocToken, which identifies a document
record.


/* application-defined token */
#define   typeMyDocToken  0x72636F64  /* 'docr' */

The following figure shows the logical arrangement of a descriptor record of
descriptor type typeMyDocToken whose data is specified by a pointer to a
document record.

The MyFindPropertyOfWindowObjectAccessor routine shown in the figure in section
Writing Object Accessor Functions That Find Properties returns a token of
descriptor type typeMyWindowProp for every property that it can locate.


/* application-defined token */
#define  typeMyWindowProp   0x726C6F63   /* 'colr' */

The following figure shows the logical arrangement of a descriptor record of
descriptor type typeMyWindowProp that identifies the bounds property of a
window. Its data consists of a window pointer and the constant pBounds. The
application can use this token either to return or to change the window's
bounds setting, depending on the OSA event that specified the property. If the
token specified pName instead, the application could use it either to return
the window's name as a string or to change the window's name.

A token's data should always contain a reference to the corresponding OSA event
objects-not a copy of the data for those objects. This allows the same token to
be used for both reading and writing tokens.

It is often possible to use the same token type for objects of several object
classes, or for both an object of a given class and one of its properties. A
token's data is private to your application and can be organized in any way
that is convenient.

When an object accessor function that supports key form formRange locates a
range of OSA event objects, it should normally return a descriptor list
(AEDescList) of tokens for the individual objects. A typical exception is an
object accessor function that returns a range of objects of class cText, which
should return a single token representing the entire range. For example, an
object accessor function that finds "all the characters from char 1 to char
1024" should return a token that consists of a list of 1024 objects, each of
class cChar, whereas an object specifier function that finds "all the text from
char 1 to char 1024" should return a single token for a single item of class
cText that is 1024 characters long.

A token is valid only until the OSA Event Manager has located the requested
element in the container the token represents and returned another token for
the element. The OSA Event Manager disposes of intermediate tokens after it
finishes resolving an object specifier record, but one token is always left
over-the token that identifies the specified OSA event object or objects. Your
application should dispose of this final token by calling the AEDisposeToken
function, which in turn calls your application's token disposal function (if
one exists), an optional object callback function that disposes of a token.

If your application does not provide a token disposal function, the OSA Event
Manager uses the AEDisposeDesc function to dispose of tokens. This function
does the job as long as disposing of tokens involves nothing more than simply
disposing of a descriptor record. Otherwise, you need to provide a custom token
disposal function. For example, suppose the data field of a token descriptor
record contains a handle to a block that in turn contains references to memory
for the OSA event object referred to by the token. In this case, the
application should provide a token disposal function that performs the tasks
required to dispose of the token and any associated structures.


ΓòÉΓòÉΓòÉ 7.4.4. Handling Whose Tests ΓòÉΓòÉΓòÉ

If your application provides an object-counting function and an
object-comparison function in addition to the appropriate object accessor
functions, the OSA Event Manager can resolve object specifier records that
specify formTest without any other assistance from your application. The OSA
Event Manager translates object specifier records of key form formTest into
object specifier records of key form formWhose. This involves collapsing the
key form and key data from two object specifier records in a container
hierarchy into one object specifier record with the key form formWhose.

Some applications may find it more efficient to translate whose tests into
their own query languages rather than letting the OSA Event Manager handle the
tests. This is useful only for applications that can make use of a test
combined with either an absolute position or a range to locate objects. If you
want the OSA Event Manager to let your application handle whose tests, set the
kAEIDoWhose flag in the callbackFlags parameter of the AEResolve function. If
for any reason one of your application's object accessor functions chooses not
to handle a particular whose descriptor record, it should return
errAEEventNotHandled as the result code, and the OSA Event Manager will try
again using the original object specifier records, just as if the kAEIDoWhose
flag were not set.

The key data for formWhose is specified by a whose descriptor record, which is
a coerced AE record of descriptor type typeWhoseDescriptor. The data for a
whose descriptor record consists of the two keyword-specified descriptor
records shown in the following table.

ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
ΓöéKeyword     ΓöéDescriptor type       ΓöéData                      Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöékeyAEIndex  ΓöétypeLongInteger       ΓöéOffset of requested       Γöé
Γöé            Γöé                      Γöéelement in group of       Γöé
Γöé            Γöé                      Γöéelements that pass a test Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé            ΓöétypeAbsoluteOrdinal   ΓöékAEFirst                  Γöé
Γöé            Γöé                      ΓöékAEMiddle                 Γöé
Γöé            Γöé                      ΓöékAELast                   Γöé
Γöé            Γöé                      ΓöékAEAny                    Γöé
Γöé            Γöé                      ΓöékAEAll                    Γöé
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Γöé            ΓöétypeWhoseRange        ΓöéWhose range descriptor    Γöé
Γöé            Γöé                      Γöérecord                    Γöé
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ΓöékeyAETest   ΓöétypeCompDescriptor    ΓöéComparison descriptor     Γöé
Γöé            Γöé                      Γöérecord                    Γöé
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Γöé            ΓöétypeLogicalDescriptor ΓöéLogical descriptor record Γöé
ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

A whose descriptor record is never created directly by an application. The OSA
Event Manager creates a whose descriptor record whenever an object specifier
record of key form formTest is used to describe the container for elements
described by an object specifier record of key form formAbsolutePosition or
formRange, with some exceptions as noted in this section.

For example, the first figure in section Key Data for a Test shows four object
specifier records that show the container hierarchy for the first row that
meets a test in the table "MyAddresses" of the database "WaveDB." The top two
object specifier records in that figure use the key forms formAbsolutePosition
and formTest to describe elements in a container. When it receives these two
object specifier records, the OSA Event Manager collapses them into one, as
shown in the following figure. It then calls the application's object-counting
function to find out how many objects of class cRow the table contains and the
object-comparison function to test the rows in the table until it finds the
first row that passes the test.

If the elements to be tested are described by an object specifier record of key
form formAbsolutePosition or formRange but are not of the same object class as
their container, the OSA Event Manager cannot collapse the existing object
specifier records into a whose descriptor record. Instead, the OSA Event
Manager creates a whose descriptor record as if a third object specifier record
of key form formAbsolutePosition and kAEAll were inserted between the object
specifier record for the container and that for the tested elements. For
example, the OSA Event Manager would interpret a request for "character 1 of
word whose first letter = 'a'" as "character 1 of every word whose first letter
= 'a'."

When an object specifier record of key form formTest is used to describe the
container for elements described by an object specifier record of key form
formRange, the OSA Event Manager will, under certain conditions, coerce the
corresponding range descriptor record to a whose range descriptor record, which
is a coerced AE record of typeWhoseRange. The data for a whose range descriptor
record consists of two keyword-specified descriptor records with the descriptor
types and data shown in the following table.

ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
ΓöéKeyword             ΓöéDescriptor type     ΓöéData                Γöé
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ΓöékeyAEWhoseRangeStartΓöétypeLongInteger     ΓöéOffset of beginning Γöé
Γöé                    Γöé                    Γöéof range            Γöé
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Γöé                    ΓöétypeAbsoluteOrdinal ΓöékAEFirst            Γöé
Γöé                    Γöé                    ΓöékAEMiddle           Γöé
Γöé                    Γöé                    ΓöékAELast             Γöé
Γöé                    Γöé                    ΓöékAEAny              Γöé
Γöé                    Γöé                    ΓöékAEAll              Γöé
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ΓöékeyAEWhoseRangeStop ΓöétypeLongInteger     ΓöéOffset of end of    Γöé
Γöé                    Γöé                    Γöérange               Γöé
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Γöé                    ΓöétypeAbsoluteOrdinal ΓöékAEFirst            Γöé
Γöé                    Γöé                    ΓöékAMiddle            Γöé
Γöé                    Γöé                    ΓöékAELast             Γöé
Γöé                    Γöé                    ΓöékAEAny              Γöé
Γöé                    Γöé                    ΓöékAEAll              Γöé
ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

A whose range descriptor record describes the absolute position of the boundary
elements, within the set of all elements that pass a test, that identify the
beginning and end of the desired range.

The OSA Event Manager coerces a range descriptor record to a whose range
descriptor record if the specified container and its elements are of the same
class, if the container for the specified range of elements is a group of OSA
event objects that pass a test, and if the boundary objects in the original
range descriptor record meet these conditions:

     Both boundary objects are of the same object class as the OSA event
      objects in the range they specify.

     The object specifier record for each boundary object specifies its
      container with a descriptor record of descriptor type
      typeCurrentContainer.

     The object specifier record for each boundary object specifies a key form
      of formAbsolutePosition.

 If these conditions are not met, the OSA Event Manager does not create a whose
 range descriptor record. Instead, as described earlier in this section, the
 OSA Event Manager creates a whose descriptor record as if the original request
 specified every element that passed the test.

 If your application sets the kAEIDoWhose flag in the callbackFlags parameter
 of AEResolve, you should provide object accessor functions that can handle
 formWhose. These functions should coerce the whose descriptor record specified
 as key data for an object specifier record to an AE record and extract the
 data from the AE record by calling the AEGetKeyPtr and AEGetKeyDesc functions.
 If the keyword-specified descriptor record with the keyword keyAEIndex
 specifies descriptor type typeWhoseRange, your object accessor function must
 also coerce that descriptor record to an AE record and extract the data. Your
 object accessor function should then attempt to locate the requested objects
 and, if successful, return a token that identifies them.

 If your application sets the kAEIDoWhose flag and attempts to resolve every
 whose descriptor record it receives, the OSA Event Manager does not attempt to
 resolve object specifier records of any key form. The object-counting and
 object-comparison functions are never called, and your application is solely
 responsible for determining the formats and types of all tokens.


ΓòÉΓòÉΓòÉ 7.5. Writing Object Callback Functions ΓòÉΓòÉΓòÉ

If an OSA event parameter consists of an object specifier record, your handler
for the OSA event typically calls AEResolve to begin the process of locating
the requested OSA event object or objects. In turn, AEResolve calls object
accessor functions and, if necessary, object callback functions provided by
your application.

Every application that supports OSA event objects should provide object
accessor functions that can locate OSA event objects belonging to any of the
supported object classes. For an overview of the way AEResolve calls object
accessor functions to locate OSA event objects described by object specifier
records, see Resolving Object Specifier Records.

In addition to object accessor functions, your application can provide up to
seven object callback functions:

     An object-counting function counts the number of elements of a specified
      class in a specified container, so that the OSA Event Manager can
      determine how many elements it must examine to find the element or
      elements that pass a test. Your application must provide one
      object-counting function to handle object specifier records that specify
      tests. (See Writing an Object-Counting Function.)

     An object-comparison function compares one element either to another
      element or to a descriptor record and returns either TRUE or FALSE. Your
      application must provide one object-comparison function to handle object
      specifier records that specify tests. (See Writing an Object-Comparison
      Function.)

     A token disposal function disposes of a token after your application
      calls the AEDisposeToken function. If your application does not provide a
      token disposal function, the OSA Event Manager uses the AEDisposeDesc
      function instead. Your application must provide a token disposal function
      if it requires more than a call to AEDisposeDesc to dispose of one of its
      tokens. This is true, for example, if your application supports marking
      by modifying its own data structures.

     An error callback function gives the OSA Event Manager an address to
      which to write the descriptor record it is currently working with if an
      error occurs while AEResolve is attempting to resolve an object specifier
      record. Your application is not required to provide an error callback
      function.

     Three marking callback functions are used by the OSA Event Manager to get
      a mark token from your application, to mark specific OSA event objects,
      and to pare down a group of marked OSA event objects. Your application
      must provide all three marking functions if it supports marking. (See
      Writing Marking Callback Functions.)

 To make your object callback functions available to the OSA Event Manager, use
 the AESetObjectCallbacks function:


  myErr = AESetObjectCallbacks ((OSLCompareUPP)MyCompareObjects,
                 (OSLCountUPP)MyCountObjects,
                 (OSLDisposeUPP)MyDisposeToken,
                 (OSLGetMarkUPP)MyGetMarkToken,
                 (OSLMarkUPP)MyMark,
                 (OSLAdjustMarksUPP)MyAdjustMarks,
                 (OSLGetErrUPP)MyGetErrDesc);

 Each parameter to the AESetObjectCallbacks function consists of either a
 pointer to the corresponding application-defined function or NULL if no
 function is provided. The AESetObjectCallbacks function sets object callback
 functions that are available only to your application. To set system object
 callback functions, which are available to all applications and processes
 running on the same computer, use the AEInstallSpecialHandler function.

 To handle object specifier records that specify tests, your application must
 provide an object-counting function and an object-comparison function. The OSA
 Event Manager calls your application's object-counting function to determine
 the number of OSA event objects in a specified container that need to be
 tested. The OSA Event Manager calls your application's object-comparison
 function when it needs to compare one OSA event object to either another OSA
 event object or to a value in a descriptor record.

 If your application does not provide a token disposal function, the OSA Event
 Manager uses the AEDisposeDesc function to dispose of tokens. This function
 does the job as long as disposing of tokens involves nothing more than simply
 disposing of a descriptor record. Otherwise, you need to provide custom token
 disposal function. For example, suppose the data field of a token descriptor
 record contains a handle to a block that in turn contains references to
 storage for the OSA event object referred to by the token. In this case, the
 application can provide a token disposal function that performs the tasks
 required to dispose of the token and any associated structures.

 Whenever more than one OSA event object passes a test, AEResolve can either
 return a list of tokens or make use of a target application's ability to mark
 its own objects. Sometimes a list of tokens can become unmanageably large. For
 example, if a Get Data event asks for the names and addresses of all customers
 with a specified zip code who have purchased a specified product, the object
 accessor function that locates all the customers with the specified zip code
 might return a list of many thousands of tokens; the elements identified by
 those tokens would then have to be tested for the specified product. However,
 if your application uses some method of marking objects, you can choose simply
 to mark the requested objects rather than returning a list of tokens. Writing
 Marking Callback Functions describes how to do this. If your application
 supports marking by modifying its own data structures, you must provide a
 token disposal function.

 When one of your application's OSA event handlers calls the AEResolve
 function, the handler should pass a value in the callbackFlags parameter that
 specifies whether your application supports whose descriptor records or
 provides marking callback functions. You can add the following constants, as
 appropriate, to provide a value for the callbackFlags parameter:


  #define  kAEIDoMinimum  0x0000;  /*Does not handle whose tests or */
                    /* provide marking callbacks*/
  #define  kAEIDoWhose   0x0001;  /*Supports key form formWhose*/
  #define  kAEIDoMarking  0x0004;  /*Provides marking functions*/

 For example, this code instructs the OSA Event Manager to call any marking
 functions previously set with the AESetObjectCallbacks function while
 resolving the object specifier record in the objectSpecifier parameter:


  AEDesc  objectSpecifier;
  AEDesc  resultToken;
  OSErr  myErr;

  myErr = AEResolve(&objectSpecifier, kAEIDoMarking, &resultToken);

 If any of the marking callback functions are not installed, AEResolve returns
 the error errAEHandlerNotFound.

 Important:  If your application does not specify kAEIDoWhose, the OSA Event
             Manager attempts to resolve all object specifier records of key
             form formTest. To do so, the OSA Event Manager uses your
             application's object-counting and object-comparison functions, and
             returns a token of type typeAEList.

             If your application does specify kAEIDoWhose, the OSA Event
             Manager does not attempt to resolve object specifier records of
             any key form. In this case, the object-counting and
             object-comparison functions are never called; your application
             determines the formats and types of all tokens; and your
             application must interpret whose descriptor records created by the
             OSA Event Manager during the resolution of object specifier
             records. For more information, see Handling Whose Tests.


ΓòÉΓòÉΓòÉ 7.5.1. Writing an Object-Counting Function ΓòÉΓòÉΓòÉ

To handle object specifier records that specify tests, your application should
provide an object-counting function (unless it specifies kAEIDoWhose as just
described). Your object-counting function should be able to count the number of
elements of a given object class in a given container. For example, if your
application supports OSA event objects that belong to the object class cText in
the Text suite, your application should provide an object-counting function
that can count OSA event objects of each element class listed in the definition
of cText in the OSA Event Registry: Standard Suites. In this case, your
application should provide an object-counting function that can count the
number of words, items, or characters in a text object.

You specify your object-counting function with the AESetObjectCallbacks
function. Whenever it is resolving an object specifier record and it requires a
count of the number of elements in a given container, the OSA Event Manager
calls your object-counting function.

Here is the declaration for a sample object-counting function:


OSErr MyCountObjects (DescType desiredClass, DescType containerClass,
           const AEDesc *containerToken, long *result);

The OSA Event Manager passes the following information to your object-counting
function: the object class ID of the OSA event objects to count, the object
class of their container, and a token identifying their container. (The
container class can be useful if you want to use one token type for several
object classes.) Your object-counting function uses this information to count
the number of OSA event objects of the specified object class in the specified
container. After counting the OSA event objects, your application should return
the noErr result code and, in the result parameter, the number of OSA event
objects counted.

The following code fragment shows an application-defined function,
MyCountObjects, that counts the number of objects for any object class
supported by the application.


OSErr APIENTRY MyCountObjects(DescType desiredClass,
               DescType containerClass,
               const AEDesc *containerToken,
               long *result)
{
  OSErr myErr = noErr;

  *result = 0;

  switch(desiredClass)
  {
   case cWindow:
     if(containerClass == typeNull)
     {
      /* count the number of windows */
      HWND hwnd = MyGetFrontWindow();
      while( hwnd != NULL)
      {
        ++result;
        hwnd = MyGetNextWindow(hwnd);
      }
     }
     break;
   case cWord:
     /* count the number of words in the container */
     myErr = MyCountWords(containerClass, containerToken, result);
     break;
   case cParagraph:
     /* count the number of paragraphs in the container */
     myErr = MyCountParagraphs(containerClass, containerToken, result);
     break;
   default:
     /* this app does not support any other object classes */
     myErr = kObjectClassNotFound;
     break;
  }
  return myErr;
}


ΓòÉΓòÉΓòÉ 7.5.2. Writing an Object-Comparison Function ΓòÉΓòÉΓòÉ

To handle object specifier records that specify tests, your application should
provide an object-comparison function (unless it specifies kAEIDoWhose). Your
object-comparison function should be able to compare one OSA event object to
another OSA event object or to another descriptor record.

You specify your object-comparison function with the AESetObjectCallbacks
function. Whenever it is resolving object specifier records and needs to
compare the value of an OSA event object with another object or with data, the
OSA Event Manager calls your object-comparison function.

Here is the declaration for a sample object-comparison function:


OSErr MyCompareObjects (DescType comparisonOperator, const AEDesc *theObject,
            AEDesc *objectOrDescToCompare, BOOL *result);

The OSA Event Manager passes the following information to your
object-comparison function: a comparison operator that specifies how the two
objects should be compared, a token for the first OSA event object, and either
a token that describes the OSA event object to compare or a descriptor record.

It is up to your application to interpret the comparison operators it receives.
The meaning of comparison operators differs according to the OSA event objects
being compared, and not all comparison operators apply to all object classes.
After successfully comparing the OSA event objects, your object-comparison
function should return the noErr result code and, in the result parameter, a
Boolean value specifying TRUE if the result of the comparison is true and FALSE
otherwise. If for any reason your comparison function is unable to compare the
specified OSA event objects, it should return the result code
errAEEventNotHandled; then the OSA Event Manager will try an alternative method
of comparing the OSA event objects, such as calling the equivalent system
object-comparison function, if one exists.

Your object-comparison function should be able to compare an OSA event object
belonging to any object class with another OSA event object. Your function
should also be able to compare two OSA event objects with different object
classes, if appropriate. For example, an object-comparison function for a
word-processing application might be asked to compare the First Name column of
a specified row in a table with the first word on a specified page-that is, to
compare an OSA event object of object class cColumn with an OSA event object of
object class cWord. You must decide what kinds of comparisons make sense for
your application.

The OSA Event Registry: Standard Suites defines standard comparison operators.
Here is a list of the constants that correspond to these comparison operators:


#define kAEBeginsWith        0x74776762  /*  "bgwt" */
#define kAEContains         0x746E6F63  /*  "cont" */
#define kAEEndsWith         0x73646E65  /*  "ends" */
#define kAEEquals          0x2020203D  /*  "=  " */
#define kAEGreaterThan       0x2020203E  /*  ">  " */
#define kAEGreaterThanEquals    0x20203D3E  /*  "=>  " */
#define kAELessThan         0x2020203C  /*  "<  " */
#define kAELessThanEquals      0x20203D3C  /*  "=<  " */

The comparison operators always relate the first operand to the second. For
example, the constant kAEGreaterThan means that the object-comparison function
should determine whether or not the value of the first operand is greater than
the value of the second operand. For more information, see
AECreateCompDescriptor function.

The following figure shows an application-defined function, MyCompareObjects,
that compares two OSA event objects of any object class supported by the
application.

OSErr MyCompareObjects (DescType comparisonOperator, AEDesc theObject,
            AEDesc objectOrDescToCompare, BOOL result)
{
  OSErr   myErr;
  result = FALSE;

  switch (comparisonOperator) {
   case kAEEquals:
     /*compare two objects for equivalence*/
     myErr = MyCompEquals(theObject, objectOrDescToCompare, result);
     return (myErr);
     break;
   case kAEGreaterThan:
     /*compare two objects for greater than*/
     myErr = MyCompGreaterThan(theObject, objectOrDescToCompare, result);
     return (myErr);
     break;
   case kAELessThan:
     /*compare two objects for less than*/
     myErr = MyCompLessThan(theObject, objectOrDescToCompare, result);
     return (myErr);
     break;
   default:
     /*this app does not support any other comparison operators*/
     return (errAEEventNotHandled);
     break;
  }
}

The MyCompareObjects function calls a separate application-defined routine for
each comparison operator. In each case, the application-defined routine that
actually performs the comparison can compare an OSA event object with either
another OSA event object or with a descriptor record's data. If for any reason
the comparison cannot be performed, the MyCompareObjects function returns the
result code errAEEventNotHandled.


ΓòÉΓòÉΓòÉ 7.5.3. Writing Marking Callback Functions ΓòÉΓòÉΓòÉ

Marking callback functions allow applications such as databases that can mark
their own objects to take advantage of that capability when resolving object
specifier records. Instead of returning a list of tokens for a group of OSA
event objects that pass a test, your application can simply mark the OSA event
objects and return a token that identifies how they have been marked. In this
way, you can speed the resolution of complex object specifier records and
reduce the amount of memory you need to allocate for tokens.

The use of marking callback functions is optional and usually makes sense if
(a) you can reasonably expect that the tokens created in the process of
resolving some object specifier records might not all fit in memory at once or
(b) your application already uses a marking mechanism. If you want the OSA
Event Manager to use marking callback functions provided by your application,
you must add the kAEIDoMarking constant to the value of the callbackFlags
parameter for the AEResolve function. If, for any reason, your application
cannot mark a requested set of OSA event objects, it should return
errAEEventNotHandled as the result code, and the OSA Event Manager will attempt
to continue resolving the object specifier record by some other method, such as
using a system marking function, if one exists.

If your application supports marking callback functions, it must provide three
functions with declarations that match these examples:


OSErr MyGetMarkToken (AEDesc containerToken, DescType containerClass,
           AEDesc Result)

OSErr MyMark (AEDesc theToken, AEDesc markToken, long markCount);

OSErr MyAdjustMarks (long newStart, long newStop, AEDesc markToken);

For more detailed information about these sample declarations, see Object
Callback Functions.

To resolve a given object specifier record with the aid of the marking callback
functions provided by your application, the OSA Event Manager first calls your
application's mark token function (MyGetMarkToken), passing a token that
identifies the container of the elements to be marked in the containerToken
parameter and the container's object class in the containerClass parameter. The
mark token function returns a mark token. A mark token, like other tokens, can
be a descriptor record of any type; however, unlike other tokens, it identifies
the way your application marks OSA event objects during the current session
while resolving a single test. A mark token does not identify a specific OSA
event object; rather, it allows your application to associate a group of
objects with a marked set.

After it receives the mark token, the OSA Event Manager can call your
application's object-marking function (MyMark) repeatedly to mark specific OSA
event objects. The OSA Event Manager passes the following information to your
marking function: in the theToken parameter, a token for the object to be
marked (obtained from the appropriate object accessor function); in the
markToken parameter, the current mark token; and in the markCount parameter,
the mark count. The mark count indicates the number of times the OSA Event
Manager has called the marking function for the current mark token. Your
application should associate the mark count with each OSA event object it
marks.

When the OSA Event Manager needs to identify either a range of elements or the
absolute position of an element in a group of OSA event objects that pass a
test, it can use your application's mark-adjusting function (MyAdjustMarks) to
unmark objects that it has previously marked. For example, suppose an object
specifier record specifies "any row in the table 'MyCustomers' for which the
City column is 'Miami'". The OSA Event Manager first uses the appropriate
object accessor routine to locate all the rows in the table for which the City
column is "Miami" and calls the application's marking function repeatedly to
mark them. It then generates a random number between 1 and the number of rows
it found that passed the test and calls the application's mark-adjusting
function to unmark all the rows whose mark count does not match the randomly
generated number. If the randomly chosen row has a mark count value of 5, the
OSA Event Manager passes the mark-adjusting function 5 in both the newStart
parameter and the newStop parameter, and the current mark token in the
markToken parameter. The newStart and newStop parameters identify the beginning
and end of the new set of marked objects that the mark-adjusting function will
create by unmarking those previously marked objects not included in the new
set.

When the OSA Event Manager calls your mark-adjusting function, your application
must dispose of any data structures that it may have created to mark the
previously marked objects. The OSA Event Manager calls your mark-adjusting
function only once for a given mark token.

A mark token is valid until the OSA Event Manager either disposes of it (by
calling AEDisposeToken) or returns it as the result of the AEResolve function.
If the final result of a call to the AEResolve function is a mark token, the
OSA event objects currently marked for that mark token are those specified by
the object specifier record passed to AEResolve, and your application can
proceed to do whatever the OSA event has requested. Note that your application
is responsible for disposing of a final mark token with a call to
AEDisposeToken, just as for any other final token.

If your application supports marking, it should also provide a token disposal
function. When the OSA Event Manager calls AEDisposeToken to dispose of a mark
token that is not the final result of a call to AEResolve, the subsequent call
to your token disposal function lets you know that you can unmark the OSA event
objects marked with that mark token. A call to AEDisposeDesc to dispose of a
mark token (which would occur if you did not provide a token disposal function)
would leave the objects marked.


ΓòÉΓòÉΓòÉ 7.6. Creating Object Specifier Records ΓòÉΓòÉΓòÉ

If your application creates and sends OSA events that require the target
application to locate OSA event objects, your application must create object
specifier records for those events. This section describes how to use the four
keyword-specified descriptor records described in Descriptor Records Used in
Object Specifier Records, to specify the object class ID, container, key form,
and key data for an object specifier record.

Because the internal structure of an object specifier record is nearly
identical to the internal structure of an AE record, it is possible to use
AECreateList, AEPutPtr, and AEPutKeyDesc, to add the four keyword-specified
descriptor records to an AE record, then use AECoerceDesc to coerce the AE
record to a descriptor record of type typeObjectSpecifier. However, it is
usually preferable to use the AECreateObjSpecifier function to accomplish the
same goal. The AECreateObjSpecifier function adds the keyword-specified
descriptor records directly to an object specifier record, thus eliminating
several steps that are required if you create an AE record first. The
instructions that follow make use of AECreateObjSpecifier.

To specify the class ID for an object specifier record, your application can
specify the appropriate class ID value as the desiredClass parameter for the
AECreateObjSpecifier function, which uses it to create a keyword-specified
descriptor record with the keyword keyAEDesiredClass as part of an object
specifier record.

To specify the container for an object specifier record, your application must
create a keyword-specified descriptor record with the keyword keyAEContainer
that fully describes the container of the OSA event object. Because this
container is usually another OSA event object, the container is usually
specified by another object specifier record.

To specify the complete container hierarchy of an OSA event object, your
application must create a series of nested object specifier records, starting
with the object specifier record for the OSA event object whose container is
outermost. With the exception of this first object specifier record, each
object specifier record specifies another object specifier record in the chain
as a container.

For example, the figure in section Object Class shows a series of nested object
specifier records that specify the first row of a table named "Summary of
Sales" in a document named "Sales Report." The logical organization of the same
object specifier records is summarized in the following table.

ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
ΓöéKeyword                ΓöéDescriptor type        ΓöéData                   Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöékeyAEDesiredClass      ΓöétypeType               ΓöécRow                   Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöékeyAEContainer         ΓöétypeObjectSpecifier    Γöé(see indented record)  Γöé
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Γöé  keyAEDesiredClass    Γöé  typeType             Γöé  cTable               Γöé
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Γöé  keyAEContainer       Γöé  typeOjectSpecifier   Γöé  (see indented record)Γöé
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Γöé    keyAEDesiredClass  Γöé    typeType           Γöé    cDocument          Γöé
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Γöé    keyAEContainer     Γöé    typeNull           Γöé    Data handle is NULLΓöé
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Γöé    keyAEKeyForm       Γöé    typeEnumerated     Γöé    formName           Γöé
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Γöé    keyAEKeyData       Γöé    typeChar           Γöé    "Sales Report"     Γöé
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Γöé  keyAEKeyForm         Γöé  typeEnumerated       Γöé  formName             Γöé
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Γöé  keyAEKeyData         Γöé  typeChar             Γöé  "Summary of Sales"   Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöékeyAEKeyForm           ΓöétypeEnumerated         ΓöéformAbsolutePosition   Γöé
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ΓöékeyAEKeyData           ΓöétypeLongInteger        Γöé1                      Γöé
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Note:  The format used in the previous table and similar tables throughout this
       chapter does not show the structure of nested object specifier records
       as they exist within an OSA event. Instead, this format shows what you
       would obtain after calling AEGetKeyDesc repeatedly to extract the object
       specifier records from an OSA event record.

When you call AEGetKeyDesc to extract a null descriptor record, AEGetKeyDesc
returns a descriptor record of type AEDesc with a descriptor type of typeNull
and a data handle whose value is 0.

 To specify the default container for an object specifier record (such as the
 container for the document in the previous table), you can use AECreateDesc to
 create a null descriptor record, which you can then pass in the theContainer
 parameter of the AECreateObjSpecifier function. The AECreateObjSpecifier
 function uses the null descriptor record to create a keyword-specified
 descriptor record with the keyword keyAEContainer as part of an object
 specifier record.

 The object specifier record that specifies the default container is always the
 first record you create in a series of nested object specifier records that
 specifies the complete container hierarchy for an OSA event object. Each one
 in the series uses the previously created object specifier record to specify
 its container. As with the null descriptor record, you can pass an object
 specifier record as the theContainer parameter to the AECreateObjSpecifier
 function, which uses it to create a keyword-specified descriptor record with
 the keyword keyAEContainer.

 To specify the key form for an object specifier record, your application can
 specify a key form constant as the keyForm parameter to the
 AECreateObjSpecifier function, which uses it to create a keyword-specified
 descriptor record with the keyword keyAEKeyForm as part of an object specifier
 record. The standard key forms for object specifier records are summarized in
 the table in section Key Data.

 For example, the key form for the object specifier records in the previous
 table that specify the document and the table is formName. In other words, the
 key data identifies the document and the table by their names. Similarly, the
 key form for the object specifier record in the previous table that specifies
 the first row in the table is formAbsolutePosition. In other words, the key
 data identifies the position of the row compared to other rows in the same
 container.

 To specify the key data for an object specifier record, your application must
 create a keyword-specified descriptor record with the keyword keyAEKeyData
 whose data handle refers to the appropriate data for the specified key form.
 You can use AECreateDesc, AECreateCompDescriptor, AECreateLogicalDescriptor,
 and related functions to create the descriptor record, which you can then pass
 in the keyData parameter of the AECreateObjSpecifier function. The
 AECreateObjSpecifier function uses this descriptor record to create a
 keyword-specified descriptor record with the keyword keyAEKeyData as part of
 an object specifier record.


ΓòÉΓòÉΓòÉ 7.6.1. Creating a Simple Object Specifier Record ΓòÉΓòÉΓòÉ

This section shows how to use the AECreateObjSpecifier function to create the
object specifier record shown in the table in section Creating Object Specifier
Records. The AECreateObjSpecifier function creates the necessary
keyword-specified descriptor records for the class ID, container, key form, and
key data and returns the resulting object specifier record as a descriptor
record of type typeObjectSpecifier.

The following code fragment shows how the AECreateObjSpecifier function creates
an object specifier record from parameters that an application specifies.

  DescType  desiredClass;
  AEDesc   myObjectContainer;
  DescType  myKeyForm;
  AEDesc   myKeyDataDesc;
  BOOL    disposeInputs;
  AEDesc   myObjSpecRec;
  OSErr   myErr;

desiredClass = cRow;
myObjectContainer = MyGetContainer;
myKeyForm = formAbsolutePosition;
myKeyDataDesc = MyGetKeyData;
disposeInputs = TRUE;

/*create an object specifier record*/
myErr = AECreateObjSpecifier(desiredClass, &myObjectContainer, myKeyForm,
               &myKeyDataDesc, disposeInputs, &myObjSpecRec);

The code shown in the previous code fragment demonstrates how an application
might use the AECreateObjSpecifier function to create four keyword-specified
descriptor records as part of a descriptor record of type typeObjectSpecifier.
The AECreateObjSpecifier function returns a result code of noErr if the object
specifier record was successfully created. The object specifier record returned
in the myObjSpecRec parameter describes an OSA event object of the class
specified by the desiredClass parameter, located in the container specified by
the myObjectContainer parameter, with the key form specified by the myKeyForm
parameter and key data specified by the myKeyDataDesc parameter.

You can specify TRUE in the disposeInputs parameter if you want the
AECreateObjSpecifier function to dispose of the descriptor records you created
for the myObjectContainer and myKeyDataDesc parameters. If you specify FALSE,
then your application is responsible for disposing of these leftover descriptor
records.

The following code fragment shows an application-defined function that uses
AECreateObjSpecifier to create an object specifier record for the first row in
the table named "Summary of Sales" in the document "Sales Report," then uses
the object specifier record returned in the myObjSpecRec parameter as the
direct parameter for a Get Data event.

OSErr MyRequestRowFromTarget (AEAddressDesc targetAddress, OSAEvent reply)
{
  DescType  desiredClass;
  DescType  myKeyForm;
  AEDesc   myObjectContainer;
  AEDesc   myObjSpecRec;
  AEDesc   myKeyDataDesc;
  long    keyData;
  OSAEvent  theOSAEvent;
  OSErr   myErr;
  OSErr   ignoreErr;

  /*initialize (set to null descriptor records) the two descriptor */
  /* records that must eventually be disposed of*/
  MyInit2DescRecs(myObjSpecRec, theOSAEvent);
  desiredClass = cRow; /*specify the class specify container for the row*/

  myErr = MyCreateTableContainer(myObjectContainer,
          "Summary of Sales", "Sales Report");
  if (myErr == noErr) {
   myKeyForm = formAbsolutePosition;  /*specify the key form*/
   keyData = 1;             /*specify the key data for row*/
   myErr = AECreateDesc(typeLongInteger, &keyData, sizeof(keyData),
              &myKeyDataDesc);
   if (myErr == noErr)
     /*create the object specifier record*/
     myErr = AECreateObjSpecifier(desiredClass, myObjectContainer,
                   myKeyForm, myKeyDataDesc, TRUE,
                   myObjSpecRec);
   if (myErr == noErr)
     /*myObjSpecRec now describes an OSA event object, and will become */
     /* direct parameter of a Get Data event; first create Get Data */
     /* event*/
     myErr = AECreateOSAEvent(kAECoreSuite, kAEGetData, &targetAddress,
                 kAutoGenerateReturnID, kAnyTransactionID,
                 &theOSAEvent);

   if (myErr == noErr)
     /* add myObjSpecRec as the direct parameter of the Get */
     /* Data event */
     myErr = AEPutParamDesc(&theOSAEvent, keyDirectObject, &myObjSpecRec);

   if (myErr == noErr)
     myErr = AESend(&theOSAEvent, &reply, kAEWaitReply + kAENeverInteract,
            kAENormalPriority, 120, NULL, NULL);
  }
  ignoreErr = AEDisposeDesc(&myObjSpecRec);
  ignoreErr = AEDisposeDesc(&theOSAEvent);
  return (myErr);
}

The MyRequestRowFromTarget function shown in the previous code fragment
specifies the class ID as cRow, indicating that the desired OSA event object is
a row in a table. It uses the application-defined function
MyCreateTableContainer to create an object specifier record for the table that
contains the row, passing "Summary of Sales" and "Sales Report" as the second
and third parameters to identify the name of the table and the name of the
document that contains the table. (The next section explains how to construct
the MyCreateTableContainer function.) It then specifies the key form as the
constant formAbsolutePosition, which indicates that the key data specifies the
position of the row within its container; sets the keyData variable to 1,
indicating the first row, and uses AECreateDesc to create a descriptor record
for the key data; and uses AECreateObjSpecifier to create the object specifier
record that describes the desired word.

The desired row is now fully described by the myObjSpecRec variable, which
contains a descriptor record of type typeObjectSpecifier that contains the
three nested object specifier records shown in the table in section Creating
Object Specifier Records. After using AECreateOSAEvent to create a Get Data
event, the MyRequestRowFromTarget function uses the AEPutParamDesc function to
add the myObjSpecRec variable to the Get Data event as a direct parameter, then
uses AESend to send the Get Data event.

Note that the MyRequestRowFromTarget function begins by using the
application-defined function MyInit2DescRecs to set myObjSpecRec and
theOSAEvent to null descriptor records. These two functions must be disposed of
whether the function is successful or not. By setting them to null descriptor
records, the function can dispose of them at the end regardless of where an
error may have occurred.


ΓòÉΓòÉΓòÉ 7.6.1.1. Specifying the Container Hierarchy ΓòÉΓòÉΓòÉ

Because the container for an object specifier record usually consists of a
chain of other object specifier records that specify the container hierarchy,
your application must create all the object specifier records in the chain,
starting with the record for the outermost container. The following two code
fragments demonstrate how to use the AECreateObjSpecifier function to create
the first two object specifier records in such a chain: the records for a
document and a table.

OSErr MyCreateDocContainer (AEDesc myDocContainer, char docName[NAMESIZE])
{
  AEDesc  myDocDescRec;
  AEDesc  nullDescRec;
  OSErr  myErr;

  /*create a descriptor record for the name of the document*/
  myErr = AECreateDesc(typeChar, &docName, strlen(docName), &myDocDescRec);
  if (myErr == noErr)   /*create a null descriptor record*/
   myErr = AECreateDesc(typeNull, NULL, 0, &nullDescRec);
  if (myErr == noErr)   /*reate an object specifier record to specify the */
              /* document object*/
   myErr = AECreateObjSpecifier(cDocument, nullDescRec, formName,
                  myDocDescRec, TRUE, myDocContainer);
   return (myErr);
}

The function MyCreateDocContainer in The previous code fragment creates an
object specifier record that identifies a document by name. It starts by using
the AECreateDesc function to create two descriptor records: one of type
typeChar for the name of the document, and one of type typeNull for the null
descriptor record that specifies the default container (because the document is
not contained in any other OSA event object). These two descriptor records can
then be used as parameters for the AECreateObjSpecifier function, which returns
an object specifier record (that is, a descriptor record of type
typeObjectSpecifier) in the myDocContainer variable. The object specifier
record specifies an OSA event object of the object class cDocument in the
container specified by the nullDescRec variable with a key form of formName and
the key data specified by the myDocDescRec variable. This object specifier can
be used by itself to specify a document, or it can be used to specify the
container for another OSA event object.

The following code fragment shows an application-defined function,
MyCreateTableContainer, that creates an object specifier record describing a
table contained in a document.

OSErr MyCreateTableContainer (AEDesc myTableContainer,
               char tableName[NAMESIZE],
               char docName[NAMESIZE])
{
  AEDesc  myDocDescRec;
  AEDesc  myTableDescRec;
  OSErr  myErr;

  /*create a container for the document*/
  myErr = MyCreateDocContainer(myDocDescRec, docName);
  if (myErr == noErr) {
   /*create the table container, first specify the descriptor record */
   /* for the key data*/
   myErr = AECreateDesc(typeChar, &tableName[1],
              strlen(tableName), &myTableDescRec);
   if (myErr == noErr)
     myErr = AECreateObjSpecifier(cTable, myDocDescRec, formName,
                   myTableDescRec, TRUE, myTableContainer);
  }
  return (myErr);
}

The function MyCreateTableContainer in the previous code fragment starts by
using the function MyCreateDocContainer from the second code fragment above to
create an object specifier record that identifies the table's container-the
document in which the table is located. Then it uses the AECreateDesc function
to create a descriptor record for the key data-a name that, when combined with
the key form formName, will identify the table in the document. The object
specifier record for the document and the descriptor record specifying the
table's name are passed to the function AECreateObjSpecifier. It returns an
object specifier record in the myTableContainer parameter that specifies an OSA
event object of the object class cTable in the container specified by the
MyDocDescRec variable with a key form of formName and the key data specified by
the myTableDescRec variable. This object specifier record can be used by itself
to specify a table, or it can be used to specify the container for another OSA
event object.

The second code fragment in section Creating Object Specifier Records uses the
MyCreateTableContainer function shown in the previous code fragment to specify
the container hierarchy illustrated in the table in section Creating Object
Specifier Records. The nested object specifier records shown in that table use
the key forms formName and formRelativePosition. You can create key data for
the key forms formPropertyID, formUniqueID, and formRelativePosition using
similar techniques.


ΓòÉΓòÉΓòÉ 7.6.1.2. Specifying a Property ΓòÉΓòÉΓòÉ

The key form formPropertyID allows your application to specify key data
identifying a property of the object specified as a container. For example, an
object specifier record that identifies the font property of a word specifies
cProperty as the class ID, an object specifier record for the word as the
property's container, formPropertyID as the key form, and the constant pFont as
the key data.

Note that an object specifier record that identifies a property does not
include a value for the property, such as Palatino. The value of a property is
returned or set as a parameter of an OSA event. For example, an application
that sends a Get Data event to get the pFont property of a word receives a
value such as Palatino in the keyAEResult parameter of the reply event, and an
application that sends a Set Data event to change the pFont property of a word
specifies a font in the keyAEData parameter of the Set Data event.

To specify the key data for a key form of formPropertyID, your application must
create a descriptor record of typeType whose data consists of a constant
specifying a property. You can use AECreateDesc to create a descriptor record
that specifies the constant for a property, then use AECreateObjSpecifier to
add the descriptor record to an object specifier record as a keyword-specified
descriptor record with the keyword keyAEKeyData.

For more information about object specifier records that specify a property,
see Key Data for a Property ID.


ΓòÉΓòÉΓòÉ 7.6.1.3. Specifying a Relative Position ΓòÉΓòÉΓòÉ

The key form formRelativePosition allows your application to specify key data
identifying an element or a set of elements that are immediately before or
after the specified container. For example, if the container is a table, you
could use a key form of formRelativePosition to specify the paragraph before or
after the table.

To specify the key data for a key form of formRelativePosition, your
application must create a descriptor record of typeEnumerated whose data
consists of a constant specifying either the element after (kAENext) or the
element before (kAEPrevious) the specified container.

You can use AECreateDesc to create a descriptor record that specifies one of
these constants, then use AECreateObjSpecifier to add it to an object specifier
record as a keyword-specified descriptor record with the keyword keyAEKeyData.

For more information about object specifier records that specify a relative
position, see Key Data for Relative Position.


ΓòÉΓòÉΓòÉ 7.6.2. Creating a Complex Object Specifier Record ΓòÉΓòÉΓòÉ

This section describes how to create object specifier records that specify a
test or a range. You can specify the object class ID for these object specifier
records the same way you would for any other object specifier record. When you
create the other three keyword-specified descriptor records, however, you can
use additional OSA Event Manager routines and descriptor types to specify any
combination of OSA event objects.


ΓòÉΓòÉΓòÉ 7.6.2.1. Specifying a Test ΓòÉΓòÉΓòÉ

The key form formTest allows your application to specify key data that
identifies one or more elements in the specified container that pass a test. To
do so, your application must construct several interconnected descriptor
records that specify comparisons and, if necessary, logical expressions.

For example, to specify "the first row in which the First Name column equals
'John' and the Last Name column equals 'Chapman' in the table 'MyAddresses' of
the database 'WaveDB,'" your application must construct an object specifier
record whose key data describes a logical expression that applies the logical
operator AND to two separate comparisons for each row: a comparison of the
First Name column to the word "John" and a comparison of the Last Name column
to the word "Chapman."

The logical organization of the data for the object specifier record that
specifies this test is summarized in the following two tables. (It is also
illustrated in the figures in section Key Data for a Test). The listings in the
remainder of this section demonstrate how to create this object specifier
record. For general information about the organization of key data for a test,
see Key Data for a Test.

The following table describes the object specifier record for the first row
that meets a test in the table named "MyAddresses."

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ΓöéKeyword                ΓöéDescriptor type              ΓöéData                     Γöé
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ΓöékeyAEDesiredClass      ΓöétypeType                     ΓöécRow                     Γöé
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ΓöékeyAEContainer         ΓöétypeObjectSpecifier          Γöé(see indented record)    Γöé
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Γöé  keyAEDesiredClass    Γöé  typeType                   Γöé  cRow                   Γöé
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Γöé  keyAEContainer       Γöé  typeObjectSpecifier        Γöé  (see indented record)  Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé    keyAEDesiredClass  Γöé    typeType                 Γöé    cTable               Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé    keyAEContainer     Γöé    typeObjectSpecifier      Γöé    (see indented record)Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé      keyAEDesiredClassΓöé      typeType               Γöé      cDatabase          Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé      keyAEContainer   Γöé      typeNull               Γöé      Data handle is NULLΓöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé      keyAEKeyForm     Γöé      typeEnumerated         Γöé      formName           Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé      keyAEKeyData     Γöé      typeChar               Γöé      "WaveDB"           Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé    keyAEKeyForm       Γöé    typeEnumerated           Γöé    formName             Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé    keyAEKeyData       Γöé    typeChar                 Γöé    "MyAddresses"        Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé  keyAEKeyForm         Γöé  typeEnumerated             Γöé  formTest               Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé  keyAEKeyData         Γöé  typeLogicalDescriptor      Γöé  (see table in section  Γöé
Γöé                       Γöé                             ΓöéSpecifying a Test)       Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöékeyAEKeyForm           ΓöétypeEnumerated               ΓöéformAbsolutePosition     Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöékeyAEKeyData           ΓöétypeLongInteger              Γöé1                        Γöé
ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

The following table describes the logical descriptor record which specifies a
test.

ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
ΓöéKeyword                ΓöéDescriptor type              ΓöéData                     Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöékeyAELogicalOperator   ΓöétypeEnumerated               ΓöékAEAnd                   Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöékeyAELogicalTerms      ΓöétypeAEList                   Γöé(see indented records)   Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé                       Γöé  typeCompDescriptor         Γöé  (see indented record)  Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé    keyAECompOperator  Γöé    typeType                 Γöé    kAEEquals            Γöé
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Γöé      keyAEKeyForm     Γöé      typeEnumerated         Γöé      formName           Γöé
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Γöé    keyAEObject2       Γöé    typeChar                 Γöé    "John"               Γöé
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Γöé    typeType           Γöé    kAEEquals                Γöé    keyAEObject1         Γöé
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Γöé                       Γöé    typeObjectSpecifier      Γöé    (see indented record)Γöé
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Γöé      keyAEDesiredClassΓöé      typeType               Γöé      cColumn            Γöé
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Γöé      keyAEContainer   Γöé      typeObjectBeingExaminedΓöé      Data handle is NULLΓöé
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Γöé      keyAEKeyForm     Γöé      typeEnumerated         Γöé      formName           Γöé
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Γöé      keyAEKeyData     Γöé      typeChar               Γöé      "Last Name"        Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé    keyAEObject2       Γöé    typeChar                 Γöé    "Chapman"            Γöé
ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

Because both the database and the table shown in The second table above are
specified by name, it would be convenient to have an application-defined
routine that creates an object specifier record that uses the key form
formName. The MyCreateFormNameObjSpecifier function shown in the following code
fragment can be used for this purpose.

OSErr MyCreateFormNameObjSpecifier (DescType class, AEDesc container,
                  char keyDataName[NAMESIZE],
                  AEDesc resultObjSpecRec)
{
  AEDesc  keyDataDescRec;
  OSErr  myErr;

  myErr = AECreateDesc(typeChar, &keyDataName[1],
            strlen(keyDataName), &keyDataDescRec);
  if (myErr == noErr)
   myErr = AECreateObjSpecifier(class, container, formName, keyDataDescRec,
                  TRUE, resultObjSpecRec);
  return (myErr);
}

The MyCreateFormNameObjSpecifier function shown in the previous code fragment
returns, in the resultObjSpecRec parameter, an object specifier record that
describes an OSA event object of the class specified by the class parameter,
located in the container specified by the container parameter, with the key
form formName and key data specified by the keyDataName parameter. This
function is used in the code three code fragments below to create object
specifier records that use the key form formName for the database and the
table.

The nested object specifier records shown in the previous table specify "the
rows in which the First Name column equals 'John' and the Last Name column
equals 'Chapman.'" To identify the rows that pass this test, the OSA Event
Manager needs to evaluate two comparisons: the comparison of each row of the
First Name column to the word "John," and the comparison of each row of the
Last Name column to the word "Chapman."

The OSA Event Manager uses the information in comparison descriptor records to
compare the specified elements in a container, one at a time, either to another
OSA event object or to the data associated with a descriptor record. The two
comparison descriptor records you need to create for this example are
summarized in the previous table.

You can use the AECreateCompDescriptor function to create a comparison
descriptor record, or you can create an AE record and use AECoerceDesc to
coerce it to a comparison descriptor record. The following code fragment shows
an example of an application-defined routine that creates an object specifier
record and a descriptor record of typeChar, then uses the
AECreateCompDescriptor function to add them to a comparison descriptor record.

OSErr MyCreateComparisonDescRec (AEDesc compDesc, char colName[NAMESIZE],
                 char name[NAMESIZE])
{
  AEDesc  logicalContainer, colNameDesc, nameDesc;
  AEDesc  myObjectExaminedContainer;
  OSErr  myErr;

  /* create the object specifier record for keyAEObject1; */
  /* first create container */
  /* create key data */
  myErr = AECreateDesc(typeObjectBeingExamined, NULL, 0,
            &myObjectExaminedContainer);
  if (myErr == noErr)
   /* now create the object specifier record */
   myErr = AECreateDesc(typeChar, &colName[1],
              strlen(colName), &colNameDesc);
  if (myErr == noErr)
    myErr = AECreateObjSpecifier(cColumn, &myObjectExaminedContainer,
                  &formName, colNameDesc, TRUE,
                  &logicalContainer);
  if (myErr == noErr)
   /* create the descriptor record for keyAEObject2 */
   myErr = AECreateDesc(typeChar, &name[1], strlen(name), &nameDesc);
  if (myErr == noErr)
   /* create the first logical term (comp descriptor record) */
   myErr = AECreateCompDescriptor(kAEEquals, &logicalContainer,
                  &nameDesc, TRUE, compDesc);
  return (myErr);
}

The MyCreateComparisonDescRec function takes two strings and uses them to
create a comparison descriptor record. The string passed in the colName
parameter specifies the name of the column whose contents should be compared to
the string passed in the name parameter. First, the MyCreateComparisonDescRec
function uses AECreateDesc to create a descriptor record of
typeObjectBeingExamined, which is returned in the myObjectExaminedContainer
variable. Next, AECreateDesc creates a descriptor record of descriptor type
typeChar, whose data consists of the string in the variable colName, and which
is returned in the variable colNameDesc. The code then passes the variables
myObjectExaminedContainer and colNameDesc to the AECreateObjSpecifier function,
which uses them to create an object specifier record, returned in the
logicalContainer variable, that becomes the keyword-specified descriptor record
with the keyword keyAEObject1.

Next, the MyCreateComparisonDescRec function uses AECreateDesc and the name
parameter to create the descriptor record for keyAEObject2, which AECreateDesc
returns in the nameDesc variable. Finally, the code passes the constant
kAEEquals, the variable logicalContainer, and the variable nameDesc to the
AECreateCompDescriptor function, which creates a comparison descriptor record
that allows the OSA Event Manager (with the help of object-comparison functions
provided by the server application) to determine whether the specified column
in the row currently being checked equals the specified string.

You can use the MyCreateComparisonDescRec function to create both the
descriptor records of type typeCompDescriptor shown in the previous table.
These descriptor records provide two logical terms for a logical descriptor
record. The entire logical descriptor record corresponds to the logical
expression "the First Name column equals 'John' AND the Last Name column equals
'Chapman.'"

You can use the AECreateLogicalDescriptor function to create a logical
descriptor record, or you can create an AE record and use the AECoerceDesc
function to coerce it to a comparison descriptor record. The following code
fragment shows an application-defined function that adds two comparison
descriptor records to a descriptor list, then uses the
AECreateLogicalDescriptor function to create a logical descriptor record whose
logical terms are the two comparison descriptor records.

OSErr MyCreateLogicalDescRec (AEDesc compDesc1, AEDesc compDesc2,
               DescType logicalOperator, AEDesc logicalDesc)
{
  AEDescList logicalTermsList;
  OSErr myErr;

  /* create a logical descriptor record that contains two */
  /* comparison descriptor records */
  /* first create a list */
  myErr = AECreateList(NULL, 0, FALSE, &logicalTermsList);
  if (myErr == noErr)
    myErr = AEPutDesc(&logicalTermsList, 1, &compDesc1);
  if (myErr == noErr)
    myErr = AEPutDesc(&logicalTermsList, 2, &compDesc2);
  if (myErr == noErr)
    myErr = AEDisposeDesc(&compDesc1);
  if (myErr == noErr)
    myErr = AEDisposeDesc(&compDesc2);
  if (myErr == noErr)
    myErr = AECreateLogicalDescriptor(&logicalTermsList, logicalOperator,
                     TRUE, &logicalDesc);
  return (myErr);
}

The following code fragment uses the application-defined functions shown in the
previous three code fragment to build the object specifier record illustrated
in the previous two tables.

OSErr MyCreateObjSpecRec (AEDesc theResultObj)
{
  AEDesc nullContainer;
  AEDesc databaseContainer;
  AEDesc tableContainer;
  AEDesc compDesc1;
  AEDesc compDesc2;
  AEDesc logicalTestDesc;
  AEDesc rowTestContainer;
  AEDesc rowOffset;
  OSErr  myErr;

  /* create a null container */
  myErr = AECreateDesc(typeNull, NULL, 0, &nullContainer);
  /* create a container for the database */
  if (myErr == noErr)
   myErr = MyCreateFormNameObjSpecifier(cDatabase, nullContainer,
                      "WaveDB", databaseContainer);
  if (myErr == noErr)
   /*create a container for the table*/
   myErr = MyCreateFormNameObjSpecifier(cTable, databaseContainer,
                      "MyAddresses", tableContainer);
  /* create a container for the row--an object specifier record that */
  /* specifies a test (the row whose First Name column = "John" and */
  /* Last Name column = "Chapman") */
  /* create the first comparison descriptor record */
  if (myErr == noErr)
   myErr = MyCreateComparisonDescRec(compDesc1, "First Name", "John");
  /* create the second comparison descriptor record */
  if (myErr == noErr)
   myErr = MyCreateComparisonDescRec(compDesc2, "Last Name", "Chapman");
  /* create the logical descriptor record*/
  if (myErr == noErr)
   myErr = MyCreateLogicalDescRec(compDesc1, compDesc2, kAEAND,
                   logicalTestDesc);
  /* now cr4ate the object specifier record that specifies the test */
  if (myErr == noErr)
   myErr = AECreateObjSpecifier(cRow, &tableContainer, &formTest,
                  logicalTestDesc, TRUE, &rowTestContainer);
  /* create the object specifier record for the OSA event object */
  /* first, create the descriptor record for the key data */
  if (myErr == noErr)
    myErr = AECreateOffsetDescriptor (1, &rowOffset);
  /* now create the object specifier record */
  if (myErr == noErr)
   myErr = AECreateObjSpecifier(cRow, &rowTestContainer,
                  &formAbsolutePosition, rowOffset,
                  TRUE, &theResultObj);
  return (myErr);
}

The MyCreateObjSpecRec function shown in the previous code fragment begins by
using AECreateDesc to create a null descriptor record, then uses the
MyCreateFormNameObjSpecifier function (shown in the first code fragment in this
section) to specify the default container for the database named "WaveDB." The
code then calls the MyCreateFormNameObjSpecifier function again, this time
passing the object specifier record for WaveDB to specify the container for the
table "MyAddresses." The next two calls are both to the
MyCreateComparisonDescRec function (shown in the second code fragment in this
section), which creates the comparison descriptor records that allow the OSA
Event Manager to compare the First Name column and Last Name column to the
names "John" and "Chapman," respectively. The next call passes these two
comparison descriptor records to the MyCreateLogicalDescRec function (shown in
the third code fragment in this section) in the compDesc1 and compDesc2
variables.

Now all the components of the logical descriptor record are ready to assemble.
The next call, to AECreateObjSpecifier, specifies the logical descriptor record
in the logicalTestDesc variable as the key data for the object specifier record
that specifies the test. A call to the OSA Event Manager routine
AECreateOffsetDescriptor then creates an offset descriptor record that contains
the integer 1. Finally, the code passes the offset descriptor record to the
AECreateObjSpecifier function in the rowOffset variable to create the final
object specifier record, which describes the requested row as the first row
that passes the test.

The AECreateOffsetDescriptor function creates a descriptor record of type
typeLongInteger that can be used as the key data with a key form of
formAbsolutePosition to indicate an element's offset within its container. A
positive integer indicates an offset from the beginning of the container (the
first element has an offset of 1), and a negative integer indicates an offset
from the end of the container (the last element has an offset of -1). Using
AECreateOffsetDescriptor accomplishes the same thing as setting a variable to
an integer and passing the variable to AECreateDesc to create a descriptor
record of type typeLongInteger.


ΓòÉΓòÉΓòÉ 7.6.2.2. Specifying a Range ΓòÉΓòÉΓòÉ

The key form formRange allows your application to specify key data that
identifies a range of elements in the specified container. To do so, your
application must first create a range descriptor record. The OSA Event Manager
uses a range descriptor record to identify the two OSA event objects that
specify the beginning and end of a range of elements.

For example, an object specifier record for a range of text in a document could
specify the table named "Summary of Sales" as the first boundary object and the
figure named "Best-Selling Widgets for 1996" as the second boundary object for
a range that consists of all the text between the table and the figure. Any
word processor that keeps track of the relative positions of text, tables, and
figures should be capable of supporting such a request.

The following table summarizes the logical organization of the data for the
object specifier record that specifies this range. For general information
about the organization of data within a range descriptor record, see Key Data
for a Range.

ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
ΓöéKeyword             ΓöéDescriptor type       ΓöéData                    Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöékeyAERangeStart     ΓöétypeObjectSpecifier   Γöé(see indented record)   Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé  keyAEDesiredClass Γöé  typeType            Γöé  cTable                Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé  keyAEContainer    Γöé  typeCurrentContainerΓöé  Data handle is NULL   Γöé
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Γöé  keyAEKeyForm      Γöé  typeEnumerated      Γöé  formName              Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé  keyAEKeyData      Γöé  typeChar            Γöé  "Summary of Sales"    Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöékeyAERangeStop      ΓöétypeObjectSpecifier   Γöé(see indented record)   Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé  keyAEDesiredClass Γöé  typeType            Γöé  cFigure               Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé  keyAEContainer    Γöé  typeCurrentContainerΓöé  Data handle is NULL   Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé  keyAEKeyForm      Γöé  typeEnumerated      Γöé  formName              Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé  keyAEKeyData      Γöé  typeChar            Γöé  "Best-Selling Widgets Γöé
Γöé                    Γöé                      Γöéfor 1996"               Γöé
ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

You can use the AECreateRangeDescriptor function to create a range descriptor
record, or you can create an AE record and use AECoerceDesc to coerce it to a
range descriptor record. The following code fragment provides an example of an
application-defined routine that creates two object specifier records, then
uses the AECreateRangeDescriptor function to add them to a range descriptor
record.

The container for the boundary objects in the range descriptor record created
by the following code fragment is the same as the container for the range
itself. The object specifier record for the range's container is added to an
object specifier record of key form formRange at the same time that the range
descriptor record is added as key data. The container for the two boundary
objects can therefore be specified in the range descriptor record by a
descriptor record of type typeCurrentContainer whose data handle has the value
NULL. The OSA Event Manager interprets this as a placeholder for the range's
container when it is resolving the range descriptor record.

OSErr MyCreateRangeDescriptor (AEDesc rangeDescRec)
{
  AEDesc  rangeStart;
  AEDesc  rangeEnd;
  AEDesc  currentContainer;
  AEDesc  tableNameDescRec;
  AEDesc  figureNameDescRec;
  OSErr  myErr;

  /* create the object specifier record for the start of the range */
  /* (the table named "Summary of Sales" in 'MyDoc' document) */

  /*create a descriptor record of type typeCurrentContainer*/
  myErr = AECreateDesc(typeCurrentContainer, NULL, 0, ¤tContainer);

  /* create the object specifier record */
  if (myErr == noErr)
   myErr = MyCreateNameDescRec(tableNameDescRec, "Summary of Sales");
  if (myErr == noErr)
   myErr = AECreateObjSpecifier(cTable, ¤tContainer, &formName,
                  tableNameDescRec, FALSE, &rangeStart);

  myErr = AEDisposeDesc(&tableNameDescRec);
  /* create the object specifier record for the end of the range */
  /* (the figure named "Best-Selling Widgets..." in "MyDoc") */
  if (myErr == noErr)
   myErr = MyCreateNameDescRec(figureNameDescRec,
                 "Best-Selling Widgets for 1996");

  if (myErr == noErr)
   myErr = AECreateObjSpecifier(cFigure, ¤tContainer, &formName,
                  figureNameDescRec, TRUE, &rangeEnd);

  /* now create the range descriptor record */
  if (myErr == noErr)
   myErr = AECreateRangeDescriptor(&rangeStart, &rangeEnd, TRUE, &rangeDescRec);

  return (myErr);
}

After creating a descriptor record of type typeCurrentContainer and a
descriptor record for the first table's name, the previous code fragment uses
the AECreateObjSpecifier function to create an object specifier record that
identifies the beginning of the range. The parameters to AECreateObjSpecifier
specify that the beginning of the range is an OSA event object of the object
class cTable in the current container, with a key form of formName and key data
that identifies the table by name. A second call to AECreateObjSpecifier
creates the object specifier record that identifies the end of the range-an OSA
event object of the cFigure object class in the current container, with a key
form of formName and key data that identifies the figure by name. Finally, the
code in the previous code fragment uses the AECreateRangeDescriptor function to
create the range descriptor record, using the two previously created object
specifier records to specify the beginning and end of the range.


ΓòÉΓòÉΓòÉ 7.7. Reference to Resolving and Creating Object Specifier Records ΓòÉΓòÉΓòÉ

This section describes the OSA Event Manager routines your application can use
to resolve and create object specifier records. It also describes
application-defined object accessor functions and object callback functions
that your application can provide for use by the OSA Event Manager in resolving
object specifier records.

The first section, Data Structures Used in Object Specifier Records, summarizes
the descriptor types and associated data that can be used in an object
specifier record. Routines for Resolving and Creating Object Specifier Records
describes the OSA Event Manager routines you use to initialize the Object
Support Library, resolve object specifier records, set and manipulate object
accessor functions, deallocate memory for tokens, and create object specifier
records. Application-Defined Routines describes the object accessor functions
and object callback functions that a server application can provide.


ΓòÉΓòÉΓòÉ 7.7.1. Data Structures Used in Object Specifier Records ΓòÉΓòÉΓòÉ

The data for object specifier records can be specified using a variety of
descriptor records and descriptor types. These are described in detail in
Descriptor Records Used in Object Specifier Records and summarized in the
following table.

ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
ΓöéKeyword                      ΓöéDescriptor type         ΓöéData                Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöékeyAEDesiredClass            ΓöétypeType                ΓöéObject class ID     Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöékeyAEContainer               ΓöétypeObjectSpecifier     ΓöéObject specifier    Γöé
Γöé                             Γöé                        Γöérecord              Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé                             ΓöétypeNull                ΓöéData handle is NULL.Γöé
Γöé                             Γöé                        ΓöéSpecifies the       Γöé
Γöé                             Γöé                        Γöédefault container atΓöé
Γöé                             Γöé                        Γöéthe top of the      Γöé
Γöé                             Γöé                        Γöécontainer hierarchy.Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé                             ΓöétypeObjectBeingExamined ΓöéData handle is NULL.Γöé
Γöé                             Γöé                        ΓöéSpecifies the       Γöé
Γöé                             Γöé                        Γöécontainer for       Γöé
Γöé                             Γöé                        Γöéelements that are   Γöé
Γöé                             Γöé                        Γöétested one at a     Γöé
Γöé                             Γöé                        Γöétime; used only withΓöé
Γöé                             Γöé                        ΓöéformTest.           Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé                             ΓöétypeCurrentContainer    ΓöéData handle is NULL.Γöé
Γöé                             Γöé                        ΓöéSpecifies a         Γöé
Γöé                             Γöé                        Γöécontainer for an    Γöé
Γöé                             Γöé                        Γöéelement that        Γöé
Γöé                             Γöé                        Γöédemarcates one      Γöé
Γöé                             Γöé                        Γöéboundary in a range.Γöé
Γöé                             Γöé                        ΓöéUsed only with      Γöé
Γöé                             Γöé                        ΓöéformRange.          Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöékeyAEKeyForm                 ΓöétypeEnumerated          ΓöéformPropertyID      Γöé
Γöé                             Γöé                        ΓöéformName            Γöé
Γöé                             Γöé                        ΓöéformUniqueID        Γöé
Γöé                             Γöé                        ΓöéformAbsolutePositionΓöé
Γöé                             Γöé                        ΓöéformRelativePositionΓöé
Γöé                             Γöé                        ΓöéformTest            Γöé
Γöé                             Γöé                        ΓöéformRange           Γöé
Γöé                             Γöé                        ΓöéformWhose           Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöékeyAEKeyData                 Γöé                        Γöé(see indented key   Γöé
Γöé                             Γöé                        Γöéforms)              Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé  for formPropertyID         ΓöétypeType                ΓöéProperty ID for an  Γöé
Γöé                             Γöé                        Γöéelement's property  Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé  for formName               ΓöétypeChar or other text  ΓöéElement's name      Γöé
Γöé                             Γöétype                    Γöé                    Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé  for formUniqueID           ΓöéAny appropriate type    ΓöéElement's unique ID Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé  for formAbsolutePosition   ΓöétypeLongInteger         ΓöéOffset from         Γöé
Γöé                             Γöé                        Γöébeginning (positive)Γöé
Γöé                             Γöé                        Γöéor end (negative) ofΓöé
Γöé                             Γöé                        Γöécontainer           Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé                             ΓöétypeAbsoluteOrdinal     ΓöékAEFirst            Γöé
Γöé                             Γöé                        ΓöékAEMiddle           Γöé
Γöé                             Γöé                        ΓöékAELast             Γöé
Γöé                             Γöé                        ΓöékAEAny              Γöé
Γöé                             Γöé                        ΓöékAEAll              Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé  for formRelativePosition   ΓöétypeEnumerated          ΓöékAENext kAEPrevious Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé  for formTest               ΓöétypeCompDescriptor      Γöé(see tables in      Γöé
Γöé                             ΓöétypeLogicalDescriptor   Γöésection Key Data forΓöé
Γöé                             Γöé                        Γöéa Test)             Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé  for formRange              ΓöétypeRangeDescriptor     Γöé(see table in       Γöé
Γöé                             Γöé                        Γöésection Key Data forΓöé
Γöé                             Γöé                        Γöéa Range)            Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé  for formWhose              ΓöétypeWhoseDescriptor     Γöé(see table in       Γöé
Γöé                             Γöé                        Γöésection Handling    Γöé
Γöé                             Γöé                        ΓöéWhose Tests)        Γöé
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ΓòÉΓòÉΓòÉ 7.7.2. Routines for Resolving and Creating Object Specifier Records ΓòÉΓòÉΓòÉ

This section describes routines for initializing the Object Support Library,
resolving object specifier records, setting and manipulating object accessor
functions, deallocating memory for tokens, and creating object specifier
records.


ΓòÉΓòÉΓòÉ 7.7.2.1. Setting Object Accessor Functions and Object Callback Functions ΓòÉΓòÉΓòÉ

The OSA Event Manager provides two routines that allow you to specify the
object accessor functions and object callback functions provided by your
application. The AEInstallObjectAccessor function adds an entry for an object
accessor function to either the application's object accessor dispatch table or
the system object accessor dispatch table. The AESetObjectCallbacks function
allows you to specify the object callback functions to be called for your
application.


ΓòÉΓòÉΓòÉ 7.7.2.2. Getting, Calling, and Removing Object Accessor Functions ΓòÉΓòÉΓòÉ

The OSA Event Manager provides three functions that allow you to get, call, and
remove object accessor functions that you have installed in either the system
or application object accessor dispatch table with the AEInstallObjectAccessor
function. The AEGetObjectAccessor and AECallObjectAccessor functions get and
call object accessor functions installed in the dispatch table you specify, and
AERemoveObjectAccessor removes an installed function.


ΓòÉΓòÉΓòÉ 7.7.2.3. Resolving Object Specifier Records ΓòÉΓòÉΓòÉ

If an OSA event parameter consists of an object specifier record, your handler
for the event typically calls the AEResolve function to begin the process of
resolving the object specifier record.


ΓòÉΓòÉΓòÉ 7.7.2.4. Deallocating Memory for Tokens ΓòÉΓòÉΓòÉ

Whenever the AEResolve function returns a final token to your event handler as
the result of the resolution of an object specifier record passed to AEResolve,
your application can call the AEDisposeToken function to deallocate the memory
used by the token.


ΓòÉΓòÉΓòÉ 7.7.2.5. Creating Object Specifier Records ΓòÉΓòÉΓòÉ

The OSA Event Manager provides five functions that you can use to create some
of the components of an object specifier record or to assemble an object
specifier record:

     The AECreateOffsetDescriptor function creates an offset descriptor
      record, which specifies the position of an element in relation to the
      beginning or end of its container.

     The AECreateCompDescriptor function creates a comparison descriptor
      record, which specifies how to compare one or more OSA event objects with
      either another OSA event object or a descriptor record.

     The AECreateLogicalDescriptor function creates a logical descriptor
      record, which specifies a logical operator and one or more logical terms
      for the OSA Event Manager to evaluate.

     The AECreateRangeDescriptor function creates a range descriptor record,
      which specifies a series of consecutive elements in the same container.

     The AECreateObjSpecifier function assembles an object specifier record,
      which identifies one or more OSA event objects, from other descriptor
      records.

 Instead of using these functions, you can create the corresponding descriptor
 records yourself using the AECreateDesc function, add them to an AE record
 using other OSA Event Manager routines, and coerce the AE record to a
 descriptor record of type typeObjectSpecifier. However, in most cases it is
 easier to use the functions listed in this section.

 All of these functions except for AECreateOffsetDescriptor include a
 disposeInputs parameter. If the value of this parameter is TRUE, the function
 automatically disposes of any descriptor records you have provided as
 parameters to the function. If the value is FALSE, the application must
 dispose of the records itself. A value of FALSE may be more efficient for some
 applications because it allows them to reuse descriptor records.

 For more information about these functions and examples of their use, see
 Creating Object Specifier Records.


ΓòÉΓòÉΓòÉ 7.7.3. Application-Defined Routines ΓòÉΓòÉΓòÉ

The AEResolve function performs tasks that are required to resolve any object
specifier record, such as parsing its contents, keeping track of the results of
tests, and handling memory management. When necessary, AEResolve calls
application-defined functions to perform tasks that are unique to the
application, such as locating a specific OSA event object in the application's
data structures or counting the number of OSA event objects in a container.

AEResolve can call two kinds of application-defined functions:

     Object accessor functions locate OSA event objects. Every application
      that supports simple object specifier records must provide one or more
      object accessor functions.

     Object callback functions perform other tasks that only an application
      can perform, such as counting, comparing, or marking OSA event objects.
      You can provide up to seven object callback functions, depending on the
      needs of your application.

 This section provides model declarations for the object accessor functions and
 object callback functions that your application can provide.


ΓòÉΓòÉΓòÉ 7.7.3.1. Object Accessor Functions ΓòÉΓòÉΓòÉ

You must provide one or more object accessor functions that can locate all the
element classes and properties listed in the OSA Event Registry: Standard
Suites for the object classes supported by your application. This section
provides the routine declaration for an object accessor function.


ΓòÉΓòÉΓòÉ 7.7.3.1.1. MyObjectAccessor ΓòÉΓòÉΓòÉ


Object accessor functions locate OSA event objects of a specified object class
in a container identified by a token of a specified descriptor type.

Syntax

#define INCL_OSA

#include <os2.h>

OSErr MyObjectAccessor (DescType desiredClass, const AEDesc *containerToken,
            DescType containerClass, DescType keyForm,
            const AEDesc *keyData, AEDesc *theToken,
            long *theRefcon)

Parameters

 desiredClass (DescType) - input
     The object class of the desired OSA event objects.

 containerToken (const AEDesc *) - input
     A token that specifies the container of the desired OSA event objects.

 containerClass (DescType) - input
     The object class of the container.

 keyForm (DescType) - input
     The key form specified by the object specifier record being resolved.

 keyData (const AEDesc *) - input
     The key data specified by the object specifier record being resolved.

 theToken (AEDesc *) - input
     The token returned by the MyObjectAccessor function.

 theRefcon (long *) - input
     A reference constant that the OSA Event Manager passes to the object
     accessor function each time it is called.

 Returns

 rc (OSErr) - returns
     Return code.

     noErr                         No error.

     errAEEventNotHandled          The object-accessor function is unable to
                                   locate the requested OSA event objects.

 Remarks

 Each object accessor function provided by your application should either find
 elements of a specified object class or find properties of an OSA event
 object. The AEResolve function uses the object class ID of the specified OSA
 event object and the descriptor type of the token that identifies the object's
 container to determine which object accessor function to call. To install an
 object accessor function either in your application's object accessor dispatch
 table or in the system object accessor dispatch table, use the
 AEInstallObjectAccessor function.

 Special Considerations

 If the OSA Event Manager receives the result code errAEEventNotHandled after
 calling an object accessor function, it attempts to use other methods of
 locating the requested objects, such as calling an equivalent system object
 accessor function. Thus, an object accessor function that cannot locate a
 requested object should return errAEEventNotHandled. This allows the OSA Event
 Manager to try other object accessor functions that may be available.


ΓòÉΓòÉΓòÉ 7.7.3.2. Object Callback Functions ΓòÉΓòÉΓòÉ

If an OSA event parameter consists of an object specifier record, your handler
for the OSA event typically calls AEResolve to begin the process of locating
the requested OSA event objects. The AEResolve function in turn calls object
accessor functions and, if necessary, object callback functions provided by
your application when it needs the information they can provide.

This section provides declarations for the seven object callback functions that
your application can provide: the object-counting function (MyCountObjects),
object-comparison function (MyCompareObjects), token disposal function
(MyDisposeToken), error callback function (MyGetErrorDesc), mark token function
(MyGetMarkToken), object-marking function (MyMark), and mark-adjusting function
(MyAdjustMarks).

For information about writing and installing object callback functions, see
Writing Object Callback Functions.


ΓòÉΓòÉΓòÉ 7.7.3.2.1. MyCountObjects ΓòÉΓòÉΓòÉ


If you want the OSA Event Manager to help your application resolve object
specifier records of key form formTest (and if your application does not
specify kAEIDoWhose function) you should provide an object-counting function
and an object-comparison function. An object-counting function counts the
number of OSA event objects of a specified class in a specified container.

Syntax

#define INCL_OSA

#include <os2.h>

(OSErr MyCountObjects (DescType desiredClass, DescType containerClass,
            const AEDesc *theContainer, long *result)

Parameters

 desiredClass (DescType) - input
     The object class of the OSA event objects to be counted.

 containerClass (DescType) - input
     The object class of the container for the OSA event objects to be counted.

 theContainer (const AEDesc *) - input
     A token that identifies the container for the OSA event objects to be
     counted.

 result (long *) - input
     Your object-counting function should return, in this parameter, the number
     of OSA event objects of the specified class in the specified container.

 Returns

 rc (OSErr) - returns
     Return code.

     noErr                         No error.

     errAEEventNotHandled          The object-counting function is unable to
                                   count the specified OSA event objects.

 Remarks

 The OSA Event Manager calls your object-counting function when, in the course
 of resolving an object specifier record, the manager requires a count of the
 number of OSA event objects of a given class in a given container.

 Special Considerations

 If the OSA Event Manager receives the result code errAEEventNotHandled after
 calling an object-counting function, it attempts to use other methods of
 counting the specified objects, such as calling an equivalent system
 object-counting function. Thus, an object-counting function that cannot count
 the specified objects should return errAEEventNotHandled. This allows the OSA
 Event Manager to try other object-counting functions that may be available.


ΓòÉΓòÉΓòÉ 7.7.3.2.2. MyCompareObjects ΓòÉΓòÉΓòÉ


If you want the OSA Event Manager to help your application resolve object
specifier records of key form formTest (and if your application does not
specify kAEIDoWhose function), you should provide an object-counting function
and an object-comparison function. After comparing one OSA event object to
another or to the data for a descriptor record, an object-comparison function
should return TRUE or FALSE in the result parameter.

Syntax

#define INCL_OSA

#include <os2.h>

OSErr MyCompareObjects (DescType comparisonOperator, const AEDesc *theObject, AEDesc *objectOrDescToCompare,
            BOOL *result)

Parameters

 comparisonOperator (DescType) - input
     The comparison operator.

     See the AECreateCompDescriptor function for standard comparison operators
     at the time of publication of this book. The current version of the OSA
     Event Registry: Standard Suites lists all the constants for comparison
     operators.

 theObject (const AEDesc *) - input
     A token.

 objectOrDescToCompare (AEDesc *) - input
     A token or some other descriptor record that specifies either an OSA event
     object or a value to compare to the OSA event object specified by the
     object parameter.

 result (BOOL *) - input
     Your object-comparison function should return, in this parameter, a
     Boolean value that indicates whether the values of the object and
     objectOrDescToCompare parameters have the relationship specified by the
     comparisonOperator parameter (TRUE) or not (FALSE).

 Returns

 rc (OSErr) - returns
     Return code.

     noErr                         No error.

     errAEEventNotHandled          The object-comparison function is unable to
                                   compare the specified OSA event objects.

 Remarks

 The OSA Event Manager calls your object-comparison function when, in the
 course of resolving an object specifier record, the manager needs to compare
 an OSA event object with another or with a value.

 It is up to your application to interpret the comparison operators it
 receives. The meaning of comparison operators differs according to the OSA
 event objects being compared, and not all comparison operators apply to all
 object classes.

 Special Considerations

 If the OSA Event Manager receives the result code errAEEventNotHandled after
 calling an object-comparison function, it attempts to use other methods of
 comparison, such as calling an equivalent system object-comparison function.
 Thus, an object-comparison function that cannot perform a requested comparison
 should returnerrAEEventNotHandled. This allows the OSA Event Manager to try
 other object-comparison functions that may be available.


ΓòÉΓòÉΓòÉ 7.7.3.2.3. MyDisposeToken ΓòÉΓòÉΓòÉ


If your application requires more than a call to the AEDisposeDesc function to
dispose of a token, or if it supports marking callback functions, you must
provide one token disposal function. A token disposal function disposes of a
specified token.

Syntax

#define INCL_OSA

#include <os2.h>

OSErr MyDisposeToken (AEDesc *unneededToken)

Parameters

 unneededToken (AEDesc *) - input
     The token to dispose of.

 Returns

 rc (OSErr) - returns
     Return code.

     noErr                         No error.

     errAEEventNotHandled          The object-comparison function is unable to
                                   compare the specified OSA event objects.

 Remarks

 The OSA Event Manager calls your token disposal function whenever it needs to
 dispose of a token. It also calls your disposal function when your application
 calls the AEDisposeToken function. If your application does not provide a
 token disposal function, the OSA Event Manager calls AEDisposeDesc instead.

 Your token disposal function must be able to dispose of all of the token types
 used by your application.

 If your application supports marking, a call to MyDisposeToken to dispose of a
 mark token lets your application know that it can unmark the objects marked
 with that mark token.

 Special Considerations

 If the OSA Event Manager receives the result code errAEEventNotHandled after
 calling a token disposal function, it attempts to dispose of the token by some
 other method, such as calling an equivalent system token disposal function if
 one is available or, if that fails, by calling AEDisposeDesc. Thus, a token
 disposal function that cannot dispose of a token should return
 errAEEventNotHandled. This allows the OSA Event Manager to try other token
 disposal functions that may be available.


ΓòÉΓòÉΓòÉ 7.7.3.2.4. MyGetErrorDesc ΓòÉΓòÉΓòÉ


If you want to find out which descriptor record is responsible for an error
that occurs during a call to the AEResolve function, you can provide an error
callback function. An error callback function returns a pointer to an address.
The OSA Event Manager uses this address to store the descriptor record it is
currently working with if an error occurs during a call to AEResolve.
Syntax

#define INCL_OSA

#include <os2.h>

OSErr MyGetErrorDesc (DescPtr *DescPtr)

Parameters

 errDescPtr (DescPtr *) - input
     A pointer to an address.

 Returns

 rc (OSErr) - returns
     Return code.

     noErr                         No error.

 Remarks

 Your error callback function simply returns an address. Shortly after your
 application calls AEResolve, the OSA Event Manager calls your error callback
 function and writes a null descriptor record to the address returned,
 overwriting whatever was there previously. If an error occurs during the
 resolution of the object specifier record, the OSA Event Manager calls your
 error callback function again and writes the descriptor record-often an object
 specifier record-to the address returned. If AEResolve returns an error during
 the resolution of an object specifier record, this address contains the
 descriptor record responsible for the error.

 Normally you should maintain a single global variable of type AEDesc whose
 address your error callback function returns no matter how many times it is
 called. Be careful if you use any other method. When recovering from an error,
 the OSA Event Manager never writes to the address you provide unless it
 already contains a null descriptor record. Thus, if you do not maintain a
 single global variable as just described, you should write null descriptor
 records to any addresses passed by your error callback function that are
 different from the addresses returned the first time your function is called
 after a given call to AEResolve.

 If the result code returned by the MyGetErrorDesc function has a nonzero
 value, the OSA Event Manager continues to resolve the object specifier record
 as if it had never called the error callback function.


ΓòÉΓòÉΓòÉ 7.7.3.2.5. MyGetMarkToken ΓòÉΓòÉΓòÉ


If your application supports marking, you must provide one mark token function.
A mark token function returns a mark token.
Syntax

#define INCL_OSA


#include <os2.h>

OSErr MyGetMarkToken (const AEDesc *containerToken, DescType containerClass,
           AEDesc *result)

Parameters

 containerToken (const AEDesc *) - input
     The OSA event object that contains the elements to be marked with the mark
     token.

 containerClass (DescType) - input
     The object class of the container that contains the objects to be marked.

 result (AEDesc *) - input
     Your mark token function should return a mark token in this parameter.

 Returns

 rc (OSErr) - returns
     Return code.

     noErr                         No error.

     errAEEventNotHandled          The mark token function is unable to return
                                   a mark token; if the OSA Event Manager gets
                                   this result, it attempts to get a mark token
                                   by calling the equivalent system marking
                                   callback function.

 Remarks

 To get a mark token, the OSA Event Manager calls your mark token function.
 Like other tokens, the mark token returned can be a descriptor record of any
 type; however, unlike other tokens, a mark token identifies the way your
 application will mark OSA event objects during the current session while
 resolving a single object specifier record that specifies the key form
 formTest.

 A mark token is valid until the OSA Event Manager either disposes of it (by
 calling AEDisposeToken) or returns it as the result of the AEResolve function.
 If the final result of a call to AEResolve is a mark token, the OSA event
 objects currently marked for that mark token are those specified by the object
 specifier record passed to AEResolve, and your application can proceed to do
 whatever the OSA event has requested. Note that your application is
 responsible for disposing of a final mark token with a call to AEDisposeToken,
 just as for any other final token.

 If your application supports marking, it should also provide a token disposal
 function modeled after the token disposal function. When the OSA Event Manager
 calls AEDisposeToken to dispose of a mark token that is not the final result
 of a call to AEResolve, the subsequent call to your token disposal function
 lets you know that you can unmark the OSA event objects marked with that mark
 token. A call to AEDisposeDesc to dispose of a mark token (which would occur
 if you did not provide a token disposal function) would go unnoticed.


ΓòÉΓòÉΓòÉ 7.7.3.2.6. MyMark ΓòÉΓòÉΓòÉ


If your application supports marking, you must provide one object-marking
function. An object-marking function marks a specific OSA event object.
Syntax

#define INCL_OSA


#include <os2.h>

OSErr MyMark (const AEDesc *theToken, const AEDesc *markToken,
       long *markCount)

Parameters

 theToken (const AEDesc *) - input
     The token for the OSA event object to be marked.

 markToken (const AEDesc *) - input
     The mark token used to mark the OSA event object.

 markCount (long *) - input
     The number of times this function has been called for the current mark
     token (that is, the number of OSA event objects that have so far passed
     the test, including the element to be marked).

 Returns

 rc (OSErr) - returns
     Return code.

     noErr                         No error.

     errAEEventNotHandled          This function is unable to mark the
                                   specified OSA event object; if the OSA Event
                                   Manager gets this result, it attempts to
                                   mark the object by calling the equivalent
                                   system object-marking function.

 Remarks

 To mark an OSA event object using the current mark token, the OSA Event
 Manager calls the object-marking function provided by your application. In
 addition to marking the specified object, your MyMark function should record
 the mark count for each object that it marks. The mark count recorded for each
 marked object allows your application to determine which of a set of marked
 tokens pass a test, as described in the next section for the MyAdjustMarks
 function.


ΓòÉΓòÉΓòÉ 7.7.3.2.7. MyAdjustMarks ΓòÉΓòÉΓòÉ


If your application supports marking, you must provide one mark-adjusting
function. A mark-adjusting function adjusts the marks made with the current
mark token.
Syntax


#define INCL_OSA

#include <os2.h>

OSErr MyAdjustMarks (long newStart, long newStop, const AEDesc *markToken)

Parameters

 newStart (long) - input
     The mark count value (provided when the MyMark callback routine was called
     to mark the object) for the first object in the new set of marked objects.

 newStop (long) - input
     The mark count value (provided when the MyMark callback routine was called
     to mark the object) for the last object in the new set of marked objects.

 markToken (const AEDesc *) - input
     The mark token for the marked objects.

 Returns

 rc (OSErr) - returns
     Return code.

     noErr                         No error.

     errAEEventNotHandled          The MyMark function is unable to mark the
                                   specified OSA event object; if the OSA Event
                                   Manager gets this result, it attempts to
                                   mark the object by calling the equivalent
                                   system object-marking function.

 Remarks

 When the OSA Event Manager needs to identify either a range of elements or the
 absolute position of an element in a group of OSA event objects that pass a
 test, it can use your application's mark-adjusting function to unmark objects
 previously marked by a call to your marking function. For example, suppose an
 object specifier record specifies "any row in the table 'MyCustomers' for
 which the City column is 'Miami.'" The OSA Event Manager first uses the
 appropriate object accessor function to locate all the rows in the table for
 which the City column is "Miami" and calls the application's marking function
 repeatedly to mark them. It then generates a random number between 1 and the
 number of rows it found that passed the test and calls the application's
 mark-adjusting function to unmark all the rows whose mark count does not match
 the randomly generated number. If the randomly chosen row has a mark count
 value of 5, the OSA Event Manager passes the value 5 to the mark-adjusting
 function in both the newStart parameter and the newStop parameter, and passes
 the current mark token in the markToken parameter. When the OSA Event Manager
 calls your MyAdjustMarks function, your application must dispose of any data
 structures that it created to mark the previously marked objects.


ΓòÉΓòÉΓòÉ 7.8. Summary of Resolving and Creating Object Specifier Records ΓòÉΓòÉΓòÉ

The following table summarizes the methods used to resolve and create object
specifier records.

ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
ΓöéFunction Name            ΓöéDescription                        Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAECallObjectAccessor     ΓöéInvokes one of your application's  Γöé
Γöé                         Γöéobject accessor functions.         Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéAECreateCompDescriptor   ΓöéCreates a comparison descriptor    Γöé
Γöé                         Γöérecord.                            Γöé
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ΓöéAECreateLogicalDescriptorΓöéCreates a logical descriptor       Γöé
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ΓöéAEResolve                ΓöéResolves an object specifier recordΓöé
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ΓòÉΓòÉΓòÉ 8. Introduction to Scripting ΓòÉΓòÉΓòÉ

Many of the examples shown in this chapter are in the AppleScript language.
AppleScript is not currently available on OS/2. Examples are also shown in the
Object REXX language.

This chapter provides an overview of the tasks involved in making your
application scriptable and recordable. This chapter also introduces some of the
ways your application can use the Component Manager and scripting components to
manipulate and execute scripts. The three chapters that follow provide detailed
information, including sample code, about the topics introduced in this
chapter.

Interapplication Communication describes the Open Scripting Architecture (OSA)
and its relationship to the OSA Event Manager and other parts of the IAC
architecture. If your application supports the appropriate core and
functional-area events defined in the OSA Event Registry: Standard Suites, you
can make it scriptable (that is, capable of responding to OSA events sent by
scripting components) by providing an OSA event terminology extension (aete)
resource. This chapter describes some of the tasks involved in making your
application scriptable and introduces the aete resource.

This chapter also introduces OSA event recording and the use of the standard
scripting component routines to manipulate and execute scripts. Recording OSA
Events describes in detail how to make your application recordable, and
Scripting Components describes how to use the standard scripting component
routines.

To use this chapter or any of the chapters that follow, you should be familiar
with OSA Events and Responding to OSA Events. If you plan to make your
application recordable, you should also read Creating and Sending OSA Events
and Resolving and Creating Object Specifier Records.

If you are developing a scripting component, you should provide support for the
standard scripting component routines described in ComponentManager.

This chapter begins with an overview of scripts and scripting components. The
rest of the chapter describes how the OSA makes it possible to do the
following:

     Make your application scriptable
     Make your application recordable
     Have your application manipulate and execute scripts


ΓòÉΓòÉΓòÉ 8.1. About Scripts and Scripting Components ΓòÉΓòÉΓòÉ

A script is any collection of data that, when executed by the appropriate
program, causes a corresponding action or series of actions. The Open Scripting
Architecture (OSA) provides a standard mechanism that allows users to control
multiple applications with scripts written in a variety of scripting languages.
Each scripting language has a corresponding scripting component. Each scripting
component supports the standard scripting component routines described in
Scripting Components.

When a scripting component executes a script, it performs the actions described
in the script, including sending OSA events to applications if necessary. Like
other components that use the Component Manager, scripting components can
provide their own routines in addition to the standard routines that must be
supported by all components of the same type.

Scripting components typically implement a text-based scripting language based
on OSA events. For example, the Object REXX component implements Object REXX, a
user scripting language provided by IBM as part of OS/2.

Other scripting components may support the standard scripting component
routines in different ways. Scripting components need not implement a
text-based scripting language, or even one that is based on OSA events. For
example, specialized scripting components can play sounds, execute
applications, or perform almost any other action when they execute scripts.

This chapter describes three ways that you can take advantage of the OSA:

     You can make your application scriptable, or capable of responding to OSA
      events sent to it by a scripting component. An application is scriptable
      if it

        -  Responds to the appropriate standard OSA events as described in
           Responding to OSA Events.

        -  Provides an OSA event terminology extension (aete) resource
           describing the OSA events that your application supports and the
           user terminology that corresponds to those events. The aete resource
           allows scripting components to interpret scripts correctly and send
           the appropriate OSA events to your application during script
           execution.

     You can make your application recordable-that is, capable of sending OSA
      events to itself to report user actions to the OSA Event Manager for
      recording purposes. After a user has turned on recording for a particular
      scripting component, the scripting component receives a copy of every
      subsequent OSA event that any application on the local computer sends to
      itself. The scripting component records such events in the form of a
      script.

     You can have your application manipulate and execute scripts with the aid
      of a scripting component. To do so, your application must:

        -  Use the Component Manager to open a connection with the appropriate
           component.

        -  Use the standard scripting component routines described in Scripting
           Components to record, edit, compile, save, load, or execute scripts.

 Users of scriptable applications can execute scripts to perform tasks that
 might otherwise be difficult to accomplish, especially repetitive or
 conditional tasks that involve multiple applications. For example, a user can
 execute an Object REXX script to locate database records with specific
 characteristics, create a series of graphs based on those records, import the
 graphs into a page-layout document, and send the document to a remote computer
 on the network via electronic mail. When a user executes such a script, the
 scripting component attempts to perform the actions the script describes,
 including sending OSA events when necessary.

 To respond appropriately to the OSA events sent to it by the scripting
 component, the database application in this example must be able to locate
 records with specific characteristics so that it can identify and return the
 requested data. These characteristics are described by an object specifier
 record that is part of an OSA event supported by the application. Also, the
 other applications involved must support OSA events that manipulate the data
 in the ways described in the script. Each application in this example must
 also provide an aete resource describing the OSA events that the application
 supports and the user terminology that corresponds to those events, so that
 the scripting component can interpret the script correctly.

 Even with little or no knowledge of a particular scripting language, users of
 applications that are recordable as well as scriptable can record simple
 scripts. More knowledgeable users may also wish to record their actions as
 scripts with recordable applications and then edit or combine scripts as
 needed.

 An application that uses scripting components to manipulate and execute
 scripts need not be scriptable; however, if it is scriptable, it can execute
 scripts that control its own behavior. In other words, it can perform tasks by
 means of scripts and allow users to modify those scripts to suit their own
 needs.

 The next three sections provide an overview of the way scripting components
 can interact with applications.


ΓòÉΓòÉΓòÉ 8.1.1. Script Editors and Script Files ΓòÉΓòÉΓòÉ

A script editor is an application that allows users to record, edit, save, and
execute scripts. For example, the Object REXX component uses the services of
the Script Editor application.

Users with some knowledge of a text based scripting language, such as Object
REXX, can use the Script Editor to modify recorded scripts or write their own
scripts. The Script Editor provides entry-level scripting capabilities, but it
is not intended for intensive script development. Users who wish to write
complex scripts may replace Script Editor with more sophisticated editors that
provide specialized debugging and development tools.


ΓòÉΓòÉΓòÉ 8.1.2. Scripting Components and Scriptable Applications ΓòÉΓòÉΓòÉ

Scripting components control the behavior of scriptable applications by means
of OSA events. For example, when the Object REXX component executes the
scripting script it sends the OSA events shown in the following figure to
trigger the actions described by the script. The client application in this
example would most commonly be a script editor but could also be any other
application that uses standard scripting component routines to manipulate and
execute scripts.

As described in OSA Events, a client application is any application that uses
OSA events to request a service or information. A client application that
executes a script does not send the corresponding OSA events itself; instead,
it uses scripting component routines to manipulate and execute the script. The
scripting component sends OSA events when necessary to trigger the actions
described in the script. Similarly, a scriptable application that responds to
the OSA events sent by a scripting component can be considered the server
application for those OSA events.

When a scripting component evaluates a script, it attempts to perform all the
actions described in the script, including sending OSA events when necessary.
In the example shown in the previous figure, the scripting component first
performs the action described in the first tell statement:


sw = .scriptableapp~connect("WaveWriter")
totals = sw document["Sales Chart"] table["Summary of Sales"]~copy()

To perform this action, the Object REXX component sends a Get Data event to the
WaveWriter application requesting the data from the specified table. The
WaveWriter application returns the data to the Object REXX component in a
standard reply OSA event, and the Object REXX component sets the value of the
variable Totals to the data returned by WaveWriter.

Then the Object REXX component performs the action described in the second tell
statement:


sc = .scriptableapp~connect("WaveCharter")
sc [document["Sales Chart"] chart[1]]~copy(totals))

In this case, the Object REXX component sends a Set Data event to the
WaveCharter application that sets the specified chart to the value of the
variable Totals.

Both WaveWriter and WaveCharter are server applications for the OSA events sent
by the Object REXX component, because they are performing services in response
to requests made by the client application via the script.

To send the appropriate OSA events to a scriptable application while executing
a script, a scripting component must obtain information about the nature of
that application's support for OSA events and the human-language terminology to
associate with those events. A scriptable application provides this information
in the form of an OSA event terminology extension (aete) resource. A scripting
component uses both the aete resource provided by a scriptable application and
the OSA event user terminology (aeut) resource provided by the scripting
component itself to obtain the information it needs to execute a script that
controls that application.

See Making Your Application Scriptable for an overview of the tasks you should
perform to make your application scriptable and a more detailed description of
the aete and aeut resources. See Making Your Application Recordable for an
overview of the tasks you should perform if you want your application to be
recordable as well as scriptable.


ΓòÉΓòÉΓòÉ 8.1.3. Scripting Components and Applications That Execute Scripts ΓòÉΓòÉΓòÉ

To store and execute scripts as a client application, your application must
first establish a connection with a scripting component registered with the
Component Manager on the same computer. Each scripting component can manipulate
and execute scripts written in the corresponding scripting language when your
application calls the standard scripting component routines.

Your application can use scripting component routines to:

     Obtain a handle to a script in a form that can be saved, and load the
      script again when necessary

     Allow users to modify scripts that have been previously saved

     Compile and execute scripts

     Redirect OSA events to script contexts

     Supply application-defined functions for use by scripting components

     Control the recording process directly, turning recording off and on and
      saving the recorded script for use by your application

 Note:  The Object REXX scripting component does not currently support script
 contexts, event handling, or recording.

 Your application can perform these tasks as a client application regardless of
 whether it is scriptable or recordable. If your application is scriptable,
 however, it can execute scripts that control its own behavior, thus acting as
 both the client application and the server application for the corresponding
 OSA events. For example, your application can allow users to associate a
 script with a custom menu command that performs a series of routine actions on
 a selected object, sets preferences, or automates other actions within your
 application.

 You can also use scripting component routines to execute scripts that perform
 tasks for your application with the aid of other applications. For example, a
 user of a word-processing application might be able to attach a script to a
 specific word so that the application executes the script whenever that word
 is double-clicked. Such a script could trigger OSA events that cause other
 applications to look up and display related information, play a movie, perform
 a calculation, play a voice annotation, and so on.

 Your application can associate a script with either OSA event objects or
 application-defined objects. Almost any user action can be used to trigger
 such a script: choosing a menu command, clicking a button, tabbing from one
 table cell to another, and so on. The script can be executed directly by the
 application when it detects a triggering action; or, if the script is
 associated with an OSA event object in the form of a script context, it can be
 executed automatically when a specified OSA event performs an action on that
 object.

 The rest of this section describes one way that an application could execute
 such a script. Suppose a forms application allows users to create custom forms
 that can include scripts associated with specific fields on the form. These
 scripts are executed when the user presses Enter or Tab in the appropriate
 field. For the purposes of this example, it does not matter whether a field
 with which a script is associated is an OSA event object (which can be
 described in an object specifier record) or some other application-defined
 object (which cannot be described in an object specifier record).

 A company could use the forms application to create a custom order form for
 taking telephone orders. If the customer has ordered from the company before,
 the user can quickly retrieve the customer's address from the company database
 by typing the customer's name in a field and pressing the Tab key. In
 response, the application executes the script associated with the field. The
 script might look like this:


  set custName to field "Customer Name"

  tell application WaveDB
     copy the first record in the table MyAddresses
       whose cell "Customer Name" = custName to Address
  end tell

  set field "Street" to item 2 of Address
  set field "City" to item 3 of Address
  set field "Zip" to item 4 of Address

 To execute such a script (or to manipulate it any other way, such as when the
 form is first created), the forms application must previously have established
 a connection with the appropriate scripting component. When the user enters a
 customer name and presses Tab, the forms application calls scripting component
 routines to execute the script. As shown in the following figure, the
 scripting component first sends the forms application a Get Data event that
 requests the contents of the "Customer Name" field and sets the variable
 custName to that value. It then sends WaveDB a Get Data event that requests
 the appropriate address information and copies it to the variable Address.
 (The replies to the Get Data events are not shown in the following figure).
 Finally, the scripting component sends the forms application a Set Data event
 that copies the address information from the variable Address to the
 appropriate fields.

 The scripting component needs to maintain the binding of the variables
 custName and Address throughout execution of the script. Scripting components
 can bind variables with the aid of a script context, which is a script that
 maintains context information for the execution of other scripts. An
 application specifies a script context when it executes a script. The forms
 application in the following figure provides a context for the scripting
 component to use whenever it executes a script associated with a button.

 In the example shown in the previous figure, the application executes the
 script directly when the cursor is in the appropriate field and the user
 presses Tab or Enter. Your application can also associate such a script with
 an object in the form of a script context, so that the script context is
 executed whenever a specified OSA event acts on the field. Using a Script
 Context to Handle an OSA Event describes this approach in more detail.

 See Manipulating and Executing Scripts for an overview of methods your
 application can use to save and load script data, compile source data, and
 perform other useful tasks with scripting component routines. Scripting
 Components provides full implementation details, including sample code and
 human interface guidelines for associating scripts with objects.


ΓòÉΓòÉΓòÉ 8.2. Making Your Application Scriptable ΓòÉΓòÉΓòÉ

To make your application scriptable, you need to:

     Define a hierarchy of OSA event objects within your application that you
      want client applications to be able to identify-that is, which objects
      can be contained by other OSA event objects in your application, which
      properties each kind of object can have, and so on

     Write OSA event handlers, object accessor functions, and other routines
      required to implement the OSA events and related object classes that you
      want to support

     Create an aete resource

 OSA Events, Responding to OSA Events, and Resolving and Creating Object
 Specifier Records describe how to perform the first two tasks. The extent to
 which scripts can control your application depends mainly on the extent of
 your application's support for OSA events. For example, if your application
 does not provide the OSA event handlers and object accessor functions required
 to locate and manipulate windows, users will not be able to use scripts to
 control your application's windows. Although you should use the definitions in
 the OSA Event Registry: Standard Suites whenever possible, you have
 considerable freedom to extend or limit your implementation of the standard
 OSA events according to the needs of your application.

 The OSA makes it possible to design new kinds of applications that always
 operate in the background and can be controlled only by means of scripts. For
 example, it is possible to design a simple telecommunications program that can
 log on to a network, send and receive text files created by another
 application, and perform other basic operations in response to scripts without
 providing any other form of user interface. Such an application would not need
 to support OSA events that control window movement or menus; instead, it would
 need to support only those OSA events that execute its basic
 telecommunications operations.

 At the other extreme, some applications allow users to arrange windows,
 palettes, and dialog boxes on their screen in many different ways, or to
 customize menus or other aspects of the presentation of information. If such
 an application can respond to scripts that control windows, dialog boxes,
 specialized preferences, and other aspects of the presentation of information,
 it can allow users who might not otherwise explore those capabilities to take
 advantage of them. For example, a naive user could execute a script that sets
 up a powerful word processor with the appropriate menus, window and palette
 arrangement, and formatting templates for a particular task, such as producing
 a company newsletter.

 Scripting components use aeut and aete resources to associate OSA event codes
 supported by your application with corresponding human-language terms used in
 scripts that control your application. Each scripting component supplies an
 aeut resource, and each scriptable application provides an aete resource. The
 next section introduces the aeut and aete resources.


ΓòÉΓòÉΓòÉ 8.3. About OSA Event Terminology Resources ΓòÉΓòÉΓòÉ

As explained in OSA Events, applications can support different combinations of
the standard suites of OSA events. Applications can also extend the definitions
of individual OSA events and object classes, or define custom OSA events and
object classes. Scripting components use the OSA event user terminology
resources, aeut and aete, to associate the IDs, keywords, and other codes used
in OSA events with the corresponding human-language terms used in scripts that
control your application.

The OSA event user terminology (aeut) resource contains terminology information
for all the standard suites of OSA events defined in the OSA Event Registry:
Standard Suites. The resource consists of a sequence of concatenated arrays
that map human-language names to each of the following:

     ID defined for each suite
     OSA events defined for each suite
     Parameters defined for each OSA event
     OSA event object classes defined for each suite
     Properties defined for each object class
     Elements defined for each object class
     Key forms defined for each element class
     Comparison operators defined for each suite
     Values for enumerators defined for each suite

 An aete resource has the same format as the aeut resource but serves a
 different purpose. Each scriptable application must include its own aete
 resource describing which of the standard suites listed in the aeut resource
 it supports and other application-specific information. Since the
 human-language equivalents for the standard suites are defined in the aeut
 resource, applications that support standard suites without any modifications
 do not have to define such equivalents; instead, they can simply list, in the
 aete resource, the suites they support. The scripting component associates the
 standard suites listed in the aete resource with the corresponding OSA event
 descriptions in its aeut resource.

 Applications can also use the aete resource to describe extensions to the
 standard suites, such as additional parameters for standard OSA events,
 additional properties and element classes for the standard OSA event object
 classes, and additional key forms for each element class. Information about
 such extensions must be included in the appropriate arrays of the aete
 resource, along with the equivalent human-language terms. Similarly, an
 application can use the aete resource to describe the parts of each standard
 suite it supports (if it does not support the entire suite) and any custom OSA
 events or OSA event object classes defined by the application.

 Scripting components can use the information in the aete and aeut resources in
 a variety of ways. The next section describes how the Object REXX component
 uses these resources when it executes or records a script. OSA Event
 Terminology Resources describes how to create an aete resource for your
 application.


ΓòÉΓòÉΓòÉ 8.3.1. How Object REXX Uses Terminology Information ΓòÉΓòÉΓòÉ

The Object REXX component uses the information in aete resources to construct
OSA events from Object REXX statements.

This section describes how the Object REXX component uses the information in
the aeut and aete resources, not how it obtains that information. For a
description of the methods available to scripting components for loading
information from terminology resources, see Dynamic Loading of Terminology
Information.

The following figure shows how the Object REXX component uses information from
the aeut resource and an application's aete resource to execute a script
consisting of Object REXX statements. When a user executes the script from a
script editor, the Object REXX component translates the script, using
information from the aeut resource and the application's aete resource to map
application-specific terms in the script with the equivalent OSA events and OSA
event parameters. The Object REXX component evaluates each expression and
performs actions or sends OSA events as appropriate.

For example, to execute the following:


objspec = document["Sales Report"] chart[1]
app[objspec]~print()

the Object REXX component uses the aeut resource and the OS/2 application's
aete resource to associate the terms used in the script with the Print OSA
event, the object class for charts, and the object class for documents. When
the Object REXX component executes the statement, it creates and sends a Print
event whose direct parameter is an object specifier record that the OS/2
application can resolve as the specified chart. The OS/2 application then
handles the OSA event by printing the chart as requested.

Note that although The previous figure shows only one OSA event generated as a
result of executing a script, the scripting component could also send a series
of OSA events to several different applications, depending on the content of
the script.

A recordable application generally needs to be able to send itself a subset of
the OSA events that it can handle as a scriptable application. A recordable
event is an OSA event that any recordable application sends to itself while
recording is turned on for the local computer (with the exception of events
that the application explicitly identifies as not for recording purposes). For
example, after a user turns on recording from the script editor application,
the OSA Event Manager sends copies of all recordable events to the script
editor. A scripting component previously selected by the user handles each
copied event for the script editor by translating the event and recording the
translation as part of a script. When a scripting component executes a recorded
script, it sends the corresponding OSA events to the applications in which they
were recorded.

Every scripting component can choose to support recordable events sent to a
recording process (such as a script editor) by receiving them and translating
them into useable forms. For example, as shown in the following figure the
scripting component uses information from the aeut resource and the
application's aete resource to translate the events into the appropriate
human-language terms and display them as scripting statements in the script
editor window. When the user opens a recorded script in the script editor and
chooses to execute the script, the scripting component sends the OSA events to
the OS/2 application, just as in the previous figure.

For example, if the user copies a chart from one document to another and the
OS/2 application performs this task by sending itself OSA events, the
equivalent source statements in the recorded script would reproduce this action
when the script was executed.

To produce these statements, the scripting component uses information from the
aeut resource and the application's aete resource to translate the events sent
by the recordable application. The scripting component then sends this
equivalent source data to the script editor for display to the user. After
completing a recording session, the user can edit and save the resulting script
and execute it again at any time.

As shown in the previous two figures, the scripting component uses information
it obtains from the aeut and aete resources when it is creating and recording
scripts. Other scripting components might use the same information during
compile or decompile, or in other ways that are specific to each component.


ΓòÉΓòÉΓòÉ 8.3.2. Dynamic Loading of Terminology Information ΓòÉΓòÉΓòÉ

When a scripting component needs information about the user terminology defined
in your application's aete resource, it sends a Get AETE event to your
application. If your application does not handle the Get AETE event, the
scripting component reads the terminology information it needs directly from
your application's aete resource.

Your application does not need to handle the Get AETE event unless it provides
separate aete resources for plug-in components. If your application does
provide separate plug-in components, the Get AETE event allows it to gather
terminology information from the aete resources for the components that are
currently running and add that information to the reply event.

If your application handles the Get AETE event, you must also provide a
scripting size resource. A scripting size resource is a resource of type scsz
that provides information about an application's capabilities and preferences
for use by scripting components.

To take advantage of dynamic loading, your application must be running. Note
that if your application does not provide a handler for the Get AETE event, the
scripting component can obtain terminology information directly from your
application's aete resource even if your application is not running.


ΓòÉΓòÉΓòÉ 8.4. Making Your Application Recordable ΓòÉΓòÉΓòÉ

If you decide to make your application scriptable, you can also make it
recordable. A recordable application is an application that uses OSA events to
report user actions to the OSA Event Manager for recording purposes. A
recordable event is any OSA event that a recordable application sends to itself
while recording is turned on for the local computer (with the exception of
events sent with the kAEDontRecord flag set in the sendMode parameter of the
AESend function).

When a user turns on recording by clicking the Record button in the Script
Editor application, the OSA Event Manager sends copies of all subsequent
recordable events to Script Editor. The scripting component handles each copied
event for Script Editor by translating it into compiled expressions and
recording the compiled expressions as part of a script. (the second figure in
section How Object REXX Uses Terminology Information shows how the scripting
component uses the aete and aeut resources when it records a script.) The user
can view the equivalent decompiled source data in Script Editor while the
script is being recorded. When a user executes a recorded script, the scripting
component sends the corresponding OSA events to the applications in which they
were recorded.

Applications generally have two parts: the code that implements the
application's user interface and the code that actually performs the work of
the application when the user manipulates the interface. One way to make your
application recordable is to separate these two parts of your application,
using OSA events to connect user actions with the work your application
performs. This is called factoring your application. In a fully factored
application, almost all tasks are carried out in response to OSA events. The
application translates low-level events that result in significant actions into
recordable OSA events and then sends them to itself.

Factoring your application is the recommended method of making your application
recordable. However, it is also possible for your application to report user
actions by means of OSA events even though it actually performs those actions
by some means other than OSA events. You can indicate that you want the OSA
Event Manager to record events in this manner, without executing them, by
adding the constant kAEDontExecute to the sendMode parameter of the AESend
function.

Before you decide how to map the user's potential actions to recordable OSA
events supported by your application, you need to answer these questions:

     What are the significant (that is, undoable) actions a user can perform
      with your application that you want to record?

     Which actions can you execute by means of OSA events, and which actions
      should cause OSA events to be sent but not executed?

     How do you want to record actions that can be described in a scripting
      language in several different ways?

 For example, if your application is a word processor, the user's selection of
 a range of text should probably not generate an OSA event, because users often
 select various different pieces of text before deciding to do something to the
 selection. However, if a user changes the font of a selection, a recordable
 word processor should generate a corresponding OSA event so that the scripting
 component can record the change.

 In general, a recordable application should generate OSA events for any user
 action that the user could reverse by choosing Undo. A recordable application
 can usually handle a greater variety of OSA events than it can record, because
 it must record the same action the same way every time even though OSA events
 might be able to trigger that action in several different ways.

 For more information about recordable applications, factoring, and the OSA
 Event Manager's recording mechanism, see Recording OSA Events. For a
 description of the role of the aete and aeut resources when the Object REXX
 component records a script, see How Object REXX Uses Terminology Information.


ΓòÉΓòÉΓòÉ 8.5. Manipulating and Executing Scripts ΓòÉΓòÉΓòÉ

Your application can use scripting component routines to manipulate and execute
scripts written in any scripting language based on the OSA. This section
describes how scripting components use script data and summarizes some of the
tasks your application can perform by calling the standard scripting component
routines.

Your application can manipulate and execute scripts regardless of whether it is
scriptable or recordable. However, if your application is scriptable, you can
easily make it capable of manipulating and executing scripts that control its
own behavior. For example, the forms application shown in the figure in section
Scripting Components and Applications That Execute Scripts uses standard
scripting component routines to execute a script whenever the cursor is in the
appropriate field and the user presses Enter or Tab. Applications can also use
scripting component routines to allow users to edit, recompile, save, and load
such scripts in order to adapt them to their own purposes.

Before using any scripting component routines, your application must open a
connection with at least one scripting component. After opening a connection
with a component, your application receives a component instance that it can
use as the first parameter for any scripting component routine. You can use the
Component Manager to establish a connection with the generic scripting
component or to establish an explicit connection with any other scripting
component. Your application can open connections with different scripting
components under different circumstances and, if necessary, simultaneously.

To manipulate or execute scripts written in any scripting language based on the
OSA, your application can open a connection with the generic scripting
component. The generic scripting component in turn attempts to open connections
dynamically with the appropriate scripting component for a given script. If
your application opens a connection with the generic scripting component, it
can load and execute scripts created by any scripting component that is
registered with the Component Manager on the current computer. The generic
scripting component also provides routines that allow you to determine which
scripting component created a particular script and to perform other useful
tasks when you are using multiple scripting components.

To manipulate and execute scripts written in a single scripting language only,
your application can open an explicit connection with the scripting component
for that language. In this case your application can load and execute only
those scripts that were created by that component; however, your application
can also take advantage of additional routines and other special capabilities
provided by the component.

After your application has established a connection with the appropriate
scripting component for an existing script, it can use the standard scripting
component routines to execute scripts. A script that has not yet been compiled
consists of source data, or statements in a scripting language. Before
executing source data, your application must use scripting component routines
to compile it so that the scripting component can keep track of it in memory
and execute it.

Scripting components can refer to at least three kinds of script data in
memory:

     A compiled script consists of compiled code that an application can
      decompile into source data or execute using the standard scripting
      component routines.

     A script value consists of an integer, a string, a Boolean value,
      constants, PICT data, or any other fixed data returned or used by a
      scripting component in the course of executing a script.

     A script context maintains context information for the execution of other
      scripts. A script context can also contain executable statements in a
      scripting language. Like a compiled script, a script context can be
      decompiled as source data.

      For example, a script context can contain user-defined handlers for
      specific OSA events. A script context that contains such handlers or
      other executable statements is called a script object. They consist of
      script statements and have no corresponding entry in OSA event dispatch
      tables.

 Scripting components keep track of script data in memory by means of script
 IDs of type OSAID.


  typedef unsigned long OSAID;

 A scripting component assigns a script ID to a compiled script or script
 context whenever the component creates or loads the corresponding script data.
 The scripting component routines that compile, load, and execute scripts all
 return script IDs, and you must pass valid script IDs to many of the other
 routines that manipulate scripts.

 Applications most commonly use scripting component routines to:

     Compile source data and execute the resulting compiled script, so that a
      user can create a new script and execute it immediately from within the
      application

     Get a handle to script data in a form that can be saved, and load and
      execute the script data again when necessary

     Allow users to modify a script, then recompile and save the script

     Redirect OSA events to script contexts

 The remainder of this section provides an overview of the scripting component
 routines you can use to perform these tasks.

 Your application can also use scripting component routines to:

     Get information about scripts

     Get information about scripting components

     Coerce script values to descriptor records and vice versa

     Set a resume dispatch function and alternative send, create, and Active
      functions for use by a scripting component

     Control the recording process directly, turning recording off and on and
      saving the recorded script for use by your application

 Scripting Components provides detailed information about using the scripting
 component routines.


ΓòÉΓòÉΓòÉ 8.5.1. Compiling, Saving, Modifying, and Executing Scripts ΓòÉΓòÉΓòÉ

This section introduces some of the scripting component functions your
application can use to compile, save, modify, and execute scripts.

To create and execute a script using the Script Editor application, a user can
type the script, then press the Run button to execute it. Your application can
provide similar capabilities by using these functions to compile source data
and execute the resulting compiled script:

     The OSACompile function takes a descriptor record with a handle to source
      data (usually text) and a script ID. If you specify kOSANullScript
      instead of an existing script ID, OSACompile returns a script ID for the
      new compiled script, which you can then pass to the OSAExecute function.

     The OSAExecute function takes a script ID for a compiled script and a
      script ID for a script context, executes the script, and returns a script
      ID for the resulting script value.

 The binding of any global variables in the compiled script is determined by
 the script context whose script ID you pass to OSAExecute. If you pass
 kOSANullScript instead of the script ID for a script context, the scripting
 component provides its own default context. If you want to provide your own
 script context rather than using the scripting component default context, you
 can use either OSACompile or OSAMakeContext to create a script context, which
 you can load and store just like a compiled script.

 After creating a script and trying it out, a user may want to save it for
 future use. Your application should normally save its scripts as script data
 rather than source data, so that it can reload and execute the data without
 recompiling it. Before saving script data, you must first call the OSAStore
 function to get a handle to the data in the form of a descriptor record. You
 can then save the data to disk.

 To allow a user to reload and execute a previously compiled and saved script,
 your application can call these functions:

     The OSALoad function takes a descriptor record that contains a handle to
      the saved script data and returns a script ID for the compiled script.

     The OSAExecute function takes a script ID for a compiled script and a
      script ID for a script context, executes the script, and returns a script
      ID for the resulting script value.

 In most cases you will want to allow users to modify saved scripts and save
 them again. To allow a user to modify and save a compiled script, your
 application can call these functions:

     The OSAGetSource function takes a script ID and returns a descriptor
      record with a handle to the equivalent source data.

     The OSACompile function takes a descriptor record with a handle to source
      data and a script ID, and returns the same script ID updated so that it
      refers to the modified and recompiled script.

     The OSAStore function takes a script ID and returns a copy of the
      corresponding script data in the form of a storage descriptor record.

 You can pass the script ID for the compiled script to be modified to the
 OSAGetSource function, which returns a descriptor record with a handle to the
 equivalent source data. Your application can then present the source data to
 the user for editing. When the user has finished editing the source data, you
 can pass the modified source data and the original script ID to the OSACompile
 function to update the script ID so that it refers to the modified and
 recompiled script. Finally, to obtain a handle to the modified script data so
 you can save it in a resource or write it to the data fork of a document, you
 can pass the script ID for the modified compiled script to the OSAStore
 function.

 If your application has no further use for a compiled script or a resulting
 script value after successfully loading, saving, compiling, or executing a
 script, you can use the OSADispose function to release the memory assigned to
 them. The OSADispose function takes a script ID and releases the memory
 assigned to the corresponding script data. A script ID is no longer valid
 after the memory associated with it has been released. This means, for
 example, that a scripting component may assign a different script ID to the
 same compiled script each time you load it, and that a scripting component may
 reuse a script ID that is no longer associated with a specific script.

 Using Scripting Component Routines provides more information about the
 standard scripting component routines described in this section.


ΓòÉΓòÉΓòÉ 8.5.2. Using a Script Context to Handle an OSA Event ΓòÉΓòÉΓòÉ

One way to associate a script with an object is to associate a script context
with a specific OSA event object-that is, with any object in your application
that can be identified by an object specifier record. When an OSA event acts on
an OSA event object with which a script context is associated, your application
attempts to use the script context to handle the OSA event. This approach can
be useful if you want to associate many different scripts with many different
kinds of objects.

The following figure illustrates one way that an application can use a script
context to handle an OSA event. This example shows how you can use a general
OSA event handler to provide initial processing for all OSA events received by
your application. If an OSA event acts on an object with which a script context
is associated, the general handler attempts to use the script context to handle
the event.

The WaveWriter application in the following figure associates script contexts
with geometric shapes such as circles or squares. These script contexts can
contain one or more user-defined handlers for specific OSA events. For example,
the script context shown in the following figure is associated with a circle
and contains a handler of this form:


move (x, y)
  continue move (current y position)

This handler exists only as scripting statements in the script context and does
not have an entry in WaveWriter's OSA event dispatch table. WaveWriter does
have its own standard OSA event handlers installed in its OSA event dispatch
table. When WaveWriter receives a Move event that acts on the circle with which
this script context is associated, WaveWriter uses the handler in the script
context to modify its own standard handling of the event. The rest of this
section describes how this works.

The MyGeneralOSAEventHandler function in the previous figure is installed in
WaveWriter's special handler dispatch table. Thus, MyGeneralOSAEventHandler
provides initial processing for all OSA events received by WaveWriter. When it
receives an OSA event, MyGeneralOSAEventHandler checks whether a script context
is associated with the object on which the event acts. If so,
MyGeneralOSAEventHandler passes the event and a script ID for the script
context to the OSADoEvent function. If not, MyGeneralOSAEventHandler returns
errAEEventNotHandled, which causes the OSA Event Manager to look for the
appropriate handler in WaveWriter's OSA event dispatch table.

The OSADoEvent function looks for a handler in the specified script context
that can handle the specified event. If the script context does not include an
appropriate handler, OSADoEvent returns errAEEventNotHandled. If the script
context includes an appropriate handler (in this example, a handler that begins
on move), OSADoEvent attempts to use the handler to handle the event.

When it encounters the continue statement during execution of the on move
handler shown in the previous figure, the scripting component calls
WaveWriter's resume dispatch function. A resume dispatch function takes an OSA
event and invokes the application's default handler for that event directly,
bypassing the application's special handler dispatch table and the
MyGeneralOSAEventHandler handler (or its equivalent). In this case, the
scripting component uses WaveWriter's default Move handler to move the circle
to a different location than the one specified in the original Move event. The
location specified by (x, current y position) has the same horizontal
coordinate as the location specified by the original event, but specifies the
circle's original vertical coordinate (the circle's original y position), thus
constraining motion to a horizontal direction.

The scripting component calls the resume dispatch function as soon as it
encounters a continue statement during script execution. For example, if the
handler in the previous figure contained additional indented statements after
the continue statement, the scripting component would proceed with the
execution of those statements after calling the resume dispatch function
successfully.

A script context can modify the event and use the default OSA event handler to
execute the modified event, as in this example; or it can override the default
handler completely, performing some completely different action; or it can
perform some action and then pass the original event to the application's
default handler to be handled in the usual way. Script contexts associated with
OSA event objects thus provide a way for users to modify or override the way an
application responds to a particular OSA event that manipulates those objects.

A general OSA event handler can use the OSAExecuteEvent function instead of
OSADoEvent to execute a script context. The main difference between these
functions is that OSAExecuteEvent returns the script ID for the resulting
script value, whereas OSADoEvent returns a reply event.

To create a script context, pass the source data for the scripting-language
statements you want the script context to contain to OSACompile with the
modeFlags parameter set to kOSACompileIntoContext. The resulting script context
is identical to a script context returned by the OSAMakeContext function,
except that it contains compiled statements.

Using a Script Context to Handle an OSA Event describes this method of
executing a script in more detail.


ΓòÉΓòÉΓòÉ 9. OSA Event Terminology Resources ΓòÉΓòÉΓòÉ

This chapter describes the resource structure used by both the aeut and aete
resources and explains how to create an aete resource for your application. It
also explains how applications that support additional plug-in modules, each
with its own aete resource, can write a handler for the Get AETE event that
collects the aete resources from the modules that are currently running.

Before you read this chapter, you should read Introduction to Scripting and the
chapters about the OSA Event Manager that are relevant to your application.

The first section in this chapter describes how the Object REXX component
interprets Object REXX statements that trigger OSA events. The first section
also explains how to define both OSA events and the corresponding user
terminology for your application in a way that translates easily into Object
REXX statements. If you implement OSA events so that they translate into
logical and useful Object REXX scripts, your implementation will probably work
well with other scripting components that resemble Object REXX.

The next two sections describe how to do the following:

     Create an aete resource
     Handle the Get AETE event

 For details about the structure of the data in an aeut resource and an scsz
 resource, see Reference to OSA Event Terminology Resources.


ΓòÉΓòÉΓòÉ 9.1. Defining Terminology for Use by the Object REXX Component ΓòÉΓòÉΓòÉ

You should keep two principles in mind when you are defining the OSA event
object hierarchy and corresponding terminology for your application:

     Avoid defining new OSA events unless absolutely necessary. For example,
      instead of defining a custom Find event, use the Get Data event with
      whose tests. (For more information about whose tests, see Resolving and
      Creating Object Specifier Records.)

     Use existing object classes or, if you must define your own, define them
      in a general fashion.

 This section describes how the terms you specify in your application's aete
 resource are used in Object REXX instructions that control your application.
 Before you implement the OSA event object hierarchy for your application, try
 out your proposed user terminology in Object REXX instructions that use the
 standard syntax forms described here. This will help you discover some of the
 advantages and disadvantages of both your proposed object hierarchy and the
 human-language terminology you are planning to use.

 Some Object REXX instructions, such as DO, IF, and SAY keyword instructions,
 are executed directly by the Object REXX component and do not correspond to
 OSA events. Others trigger OSA events when the Object REXX component evaluates
 them. For example, the <<, >>, and == methods of the Object Specifier class
 correspond to the OSA operators "begins with", "ends with", and "contains",
 respectively.

 In this chapter, the term script means a Object REXX program. The Object REXX
 component interprets the terms used in scripts according to rules the Object
 REXX language defines. See the Object REXX Reference for OS/2 for details.

 Within a Object REXX script, you can use a scriptable application proxy object
 to send events to a scriptable application.

 Specifically, to trigger OSA events you:

   1. Create a scriptable application proxy object (with the CONNECT class
      method of the ScriptableApp class; ScriptableApp Class provides details)

   2. If necessary, code the information for an object reference. (An object
      reference is usually the first parameter, the direct parameter, of an
      event message.  Object Specifier class provides details about this.)

   3. Send event messages (Sending Events describes this.)


ΓòÉΓòÉΓòÉ 9.2. Sending Events ΓòÉΓòÉΓòÉ

In general, the syntax for Object REXX instructions that trigger OSA events
follows this pattern:


ΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇ
    ΓööΓöÇresult=ΓöÇΓöÿ

ΓöÇΓöÇproxyΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇ~event(ΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇ)ΓöÇΓöÇ;ΓöÇΓöÇΓöÇΓöÇ
         ΓööΓöÇ[direct_parameter]ΓöÇΓöÿ         ΓööΓöÇadditional_parametersΓöÇΓöÿ

 result
    The information the event returns. Object REXX converts this string to a
    list or directory object.

 proxy
    An instance of the ScriptableApp class. (See ScriptableApp Class for more
    information.)

 direct_parameter
    An optional Object Specifier object that further defines the target of the
    event within the application. (See Object Specifier class for information.)

 event
    The message to send to the scriptable application.

 additional_parameters
    An Object REXX directory identifying any additional information needed to
    process the event. In the application's aete resource, a label (string)
    identifies any additional_parameters. These are optional and can be
    specified in any order. The directory index should match the label that
    identifies the parameter in the dictionary. The directory value is the
    value for the parameter.


ΓòÉΓòÉΓòÉ 9.3. ScriptableApp Class ΓòÉΓòÉΓòÉ

A scriptable application proxy object is an instance of the Object REXX
ScriptableApp class. Within a Object REXX script, you can use a scriptable
application proxy object to send events to a scriptable application.

The CONNECT class method creates a proxy object and connects it to a scriptable
application. This connection gives you access to the scriptable application's
aete resource. You can send messages to the proxy object to control the
application, using events, objects, and properties defined in the dictionary.

Note:  Only one scriptable application can be connected at a time.

The ScriptableApp class is a subclass of the Object Class.


ΓòÉΓòÉΓòÉ 9.3.1. CONNECT ΓòÉΓòÉΓòÉ


ΓöÇΓöÇCONNECT(application_name)ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇ

This class method returns an instance of the ScriptableApp class that
represents the specified scriptable application or returns the NIL object if
the connection is unsuccessful.

 application_name
    The scriptable application.

 The scriptable application you have connected remains connected until you
 disconnect it (with the DISCONNECT class method) or until you connect to
 another scriptable application. If you connect to a scriptable application
 while already connected to another scriptable application, the Object REXX
 component implicitly disconnects the first application before connecting the
 second application.

 The variable initialized before the connection is not changed, even if its
 name conflicts with a name in the dictionary. That is, only uninitialized
 variables are used when building references to objects (see Object Specifier
 class). The DISCONNECT class method, which follows, includes an example.


ΓòÉΓòÉΓòÉ 9.3.2. DISCONNECT ΓòÉΓòÉΓòÉ


ΓöÇΓöÇDISCONNECTΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇ

This class method returns 0 if successful in disconnecting the currently
connected scriptable application. Otherwise returns 1.

Variables that contain references to objects are dropped (become uninitialized)
if the application is disconnected.

Some examples follow.


ΓòÉΓòÉΓòÉ 9.3.2.1. Examples ΓòÉΓòÉΓòÉ


font = 'This variable is initialized'

/* The following line creates a proxy for the Lotus 1-2-3** ScriptableApp  */
Lotus123 = .ScriptableApp~connect('lotus123')

say font                  /* Output is 'This variable...' */
rc = .ScriptableApp~disconnec         /* Disconnects   */


ΓòÉΓòÉΓòÉ 9.4. Object Specifier class ΓòÉΓòÉΓòÉ

In applications, objects can contain other objects (for example, a paragraph
contains words). An object contained in another object is called an element. A
word is an element of a paragraph.

Using an Object REXX concatenation method indicates that the object to the
right of the concatenation operator is an element of the object to the left of
the operator. You can use the blank (" ") or the || concatenation operator.

The Object Specifier class defines concatenation methods.

An object reference identifies an object in an application. It is usually the
first parameter, the direct_parameter, of an event message.


ΓöÇΓöÇobject_classΓöÇΓöÇ[ΓöÇΓöñ reference_type Γö£ΓöÇ]ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇ


   ΓöîΓöÇ concatenation_operator ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
ΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇ
     ΓööΓöÇobject_classΓöÇΓöÇ[ΓöÇΓöñ reference_type Γö£ΓöÇ]ΓöÇΓöÿ

ΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇ
   ΓööΓöÇconcatenation_operatorΓöÇΓöÇproperty_referenceΓöÇΓöÇ;ΓöÇΓöÿ


reference_type:

Γö£ΓöÇΓöÇΓö¼ΓöÇpropertyΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
   Γö£ΓöÇobject_class[string]ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
   Γö£ΓöÇobject_class[ID id_number]ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
   Γö£ΓöÇobject_class[ΓöÇΓö¼ΓöÇpositionΓöÇΓö¼ΓöÇ]ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
   Γöé               Γö£ΓöÇFIRSTΓöÇΓöÇΓöÇΓöÇΓöñ                                   Γöé
   Γöé               Γö£ΓöÇMIDDLEΓöÇΓöÇΓöÇΓöñ                                   Γöé
   Γöé               Γö£ΓöÇLASTΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ                                   Γöé
   Γöé               Γö£ΓöÇANYΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ                                   Γöé
   Γöé               ΓööΓöÇALLΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ                                   Γöé
   Γö£ΓöÇobject_class[ΓöÇΓö¼ΓöÇBEFOREΓöÇΓö¼ΓöÇobject_reference]ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
   Γöé               ΓööΓöÇAFTERΓöÇΓöÇΓöÿ                                     Γöé
   Γö£ΓöÇobject_class[ΓöÇΓö¼ΓöÇΓö¼ΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇtermΓöÇΓö¼ΓöÇ<ΓöÇΓöÇΓö¼ΓöÇtermΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇ]ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
   │               │ └─к─┘       ├─>──┤                │          │
   Γöé               Γöé             Γö£ΓöÇ<=ΓöÇΓöñ                Γöé          Γöé
   Γöé               Γöé             Γö£ΓöÇ>=ΓöÇΓöñ                Γöé          Γöé
   Γöé               Γöé             Γö£ΓöÇ=ΓöÇΓöÇΓöñ                Γöé          Γöé
   Γöé               Γöé             Γö£ΓöÇ<<ΓöÇΓöñ                Γöé          Γöé
   Γöé               Γöé             Γö£ΓöÇ>>ΓöÇΓöñ                Γöé          Γöé
   Γöé               Γöé             ΓööΓöÇ==ΓöÇΓöÿ                Γöé          Γöé
   Γöé               ΓöéΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ Γöé          Γöé
   Γöé               ΓööΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇtermΓöÇΓö¼ΓöÇ<ΓöÇΓöÇΓö¼ΓöÇtermΓöÇΓö¼ΓöÇ&ΓöÇΓö¼ΓöÇΓö┤ΓöÇΓöÿ          Γöé
   │                   └─к─┘       ├─>──┤      └─|─┘              │
   Γöé                               Γö£ΓöÇ<=ΓöÇΓöñ                         Γöé
   Γöé                               Γö£ΓöÇ>=ΓöÇΓöñ                         Γöé
   Γöé                               Γö£ΓöÇ=ΓöÇΓöÇΓöñ                         Γöé
   Γöé                               Γö£ΓöÇ<<ΓöÇΓöñ                         Γöé
   Γöé                               Γö£ΓöÇ>>ΓöÇΓöñ                         Γöé
   Γöé                               ΓööΓöÇ==ΓöÇΓöÿ                         Γöé
   ΓööΓöÇobject_class[ΓöÇΓö¼ΓöÇnumberΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇ,ΓöÇΓö¼ΓöÇnumberΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇ]ΓöÇΓöÇΓöÿ
                   Γö£ΓöÇFIRSTΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ   Γö£ΓöÇFIRSTΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
                   Γö£ΓöÇLASTΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ   Γö£ΓöÇLASTΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
                   Γö£ΓöÇMIDDLEΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ   Γö£ΓöÇMIDDLEΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
                   ΓööΓöÇobject_referenceΓöÇΓöÿ   ΓööΓöÇobject_referenceΓöÇΓöÿ

 object_class
    The name of an object class that the application's dictionary defines.
    (Examples of object classes are document, paragraph, and table.)

 reference_type
    The type of object that object_class is. The application's dictionary lists
    the reference_types that the object_class supports. The reference_type can
    be one of the following. (Note that object classes do not have to support
    all of these types.)

    Property
            An object's property. The property is the name of the property.

            Example:


                        theFont = word[1] font;  /* "font" is the property */

    Name
            The name of an object. The string is the name of the object.

            Example:


                        my_shoes = table['my shoes'];  /* 'my shoes' is the string */

    Identifier
            The unique identifier of an object within the container or
            application. The id_number is an integer that uniquely identifies
            the object.

            Example:


                        window.17 = window[id 17]  /* the id_number is 17 */

    Position
            The position of an object within the container. The position is the
            position of the object within the container. A positive integer is
            the offset from the first element in the container. A negative
            integer is an offset from the last element.

            FIRST          The first element in the container.
            MIDDLE         The middle element in the container.
            LAST           The last element in the container.
            ANY            Any element in the container, such as any odd number
                           or any even number.
            ALL            All elements in the container.

            Example:


                        any_word = paragraph[2] word[ANY]
                        /* "2" and "ANY" are positions */

    Relative Position
            The next or previous object relative to a base container.

            BEFORE                The target object precedes the
                                  object_reference.
            AFTER                 The target object follows the
                                  object_reference.
            object_reference      The reference object that the target object
                                  precedes or follows.

            Example:


                        the_paragraph = document[1] paragraph[after table[1]];
                        /* The object_reference is "table" */

    Test
            An object or list of objects whose properties or elements match the
            specified test criteria or filter.

            term      A term used in a comparison.
            <         "less than".
            >         "greater than".
            <=        "less than or equal to".
            >=        "greater than or equal to".
            =         "equal to".
            <<        The OSA operator "begins with".
            >>        The OSA operator "ends with".
            ==        The OSA operator "contains".
            &         Logical AND.
            |         Logical OR.

            Note:  A special predefined object it is used to iterate over each
            successive object.

            Examples:


                        theWord = word[font='Helvetica' & it << 'A']
                        /* Tests for word in Helvetica font that begins with A */

                        firstSea = document[1] word[it = 'Sea' first]
                        /* Tests for first word that contains 'Sea' */

    Range
            All objects between the two boundary objects.

            number                An integer identifying the number of the
                                  element in the container.
            FIRST                 The first element in the container.
            MIDDLE                The middle element in the container.
            LAST                  The last element in the container.
            object_reference      A boundary object.

            Examples:


                        six_words = word[3, 8]
                        /* Provides list of 6 words (between word 3 and word 8) */

                        theText = document[1] text[word]1], paragraph[1]];
                        /* Provides first word of first paragraph of document 1    */
                        /* The boundary objects are not the same type in this example */

    Object properties (variables) are attributes or characteristics of the
    object. For example, an object of class word has a length property that is
    set to the number of characters in the word.

 property_reference
    A property of the object to the left of the concatenation_operator. It
    identifies a property of the containing object reference.

    For example:


        theFont = word[1] font;


ΓòÉΓòÉΓòÉ 9.5. Structure of OSA Event Terminology Resources ΓòÉΓòÉΓòÉ

The following table summarizes the resource structure used by both the aeut and
aete resources. Each asterisk (*) in the table indicates the beginning of an
array. Each array can contain any number of items, including both additional
arrays and specific definitions (Γûá).

ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
Γöé  Γûá Template version                                        Γöé
Γöé  Γûá Language code                                           Γöé
Γöé  * Array of suites:                                        Γöé
Γöé      Γûá Suite information                                   Γöé
Γöé      * Array of events:                                    Γöé
Γöé          Γûá Event information (including information about  Γöé
Γöé              the direct parameter)                         Γöé
Γöé          * Array of other parameters:                      Γöé
Γöé              Γûá Parameter information                       Γöé
Γöé      * Array of classes:                                   Γöé
Γöé          Γûá Class description                               Γöé
Γöé          * Array of properties:                            Γöé
Γöé              Γûá Property information                        Γöé
Γöé          * Array of elements:                              Γöé
Γöé              Γûá Element information                         Γöé
Γöé              * Array of key forms:                         Γöé
Γöé                  Γûá Key form information                    Γöé
Γöé      * Array of comparison operators:                      Γöé
Γöé          Γûá Comparison operator information                 Γöé
Γöé      * Array of enumerations:                              Γöé
Γöé          Γûá Enumeration information                         Γöé
Γöé          * Array of enumerators:                           Γöé
Γöé              Γûá Enumerator information                      Γöé
ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

The following code fragment shows the resource type declaration in Rez format
for the aeut resource, which can also serve as a template for an aete resource.
(Rez is a resource compiler available with the MPW programming environment.)
For complete descriptions of all the fields shown in the following code
fragment, see Reference to OSA Event Terminology Resources.

type 'aeut' {
   hex byte;                /*major version in binary-coded */
                       /* decimal (BCD)*/
   hex byte;                /*minor version in BCD*/
   integer  Language, english = 0, japanese = 11; /*language code*/
   integer  Script, roman = 0;       /*script code*/
   integer = $$Countof(Suites);
   array Suites {
     pstring;              /*human-language name of suite*/
     pstring;              /*suite description*/
     align word;             /*alignment*/
     literal longint;          /*suite ID*/
     integer;              /*suite level*/
     integer;              /*suite version*/
     integer = $$Countof(Events);
     array Events {
        pstring;            /*human-language name of event*/
        pstring;            /*event description*/
        align word;          /*alignment*/
        literal  longint;       /*event class*/
        literal  longint;       /*event ID*/
        literal  longint noReply = 'null'; /*reply type */
        pstring;            /*reply description*/
        align word;          /*alignment*/
        boolean  replyRequired,    /*if the reply is*/
            replyOptional;    /* required*/
        boolean  singleItem,      /*if the reply must be a list*/
            listOfItems;
        boolean  notEnumerated,    /*if the type is enumerated*/
            enumerated;
        boolean  reserved;       /*these 13 bits are reserved;*/
        boolean  reserved;       /*set them to "reserved"*/
        boolean  reserved;
        boolean  reserved;
        boolean  reserved;
        boolean  reserved;
        boolean  reserved;
        boolean  reserved;
        boolean  reserved;
        boolean  reserved;
        boolean  reserved;
        boolean  reserved;
        boolean  reserved,       /*if event is verb event or nonverb */
            nonVerbEvent;     /*event; used by Japanese dialect*/
        literal longint  noParams = 'null'; /*direct param type*/
        pstring;            /*direct param description*/
        align word;          /*alignment*/
        boolean  directParamRequired, /*if the direct param is required*/
            directParamOptional;
        boolean  singleItem,      /*if the param must be a list*/
            listOfItems;
        boolean  notEnumerated,    /*if the type is enumerated*/
            enumerated;
        boolean  doesntChangeState,  /*if the event changes server's state */
            changesState;
        boolean  reserved;       /*these 12 bits are reserved;*/
        boolean  reserved;       /*set them to "reserved"*/
        boolean  reserved;
        boolean  reserved;
        boolean  reserved;
        boolean  reserved;
        boolean  reserved;
        boolean  reserved;
        boolean  reserved;
        boolean  reserved;
        boolean  reserved;
        boolean  reserved;
        integer = $$Countof(OtherParams);
        array OtherParams {
         pstring;          /*human-language name for parameter*/
         align word;         /*alignment*/
         literal longint;      /*parameter keyword*/
         literal longint;      /*parameter type*/
         pstring;          /*parameter description*/
         align word;         /*alignment*/
         boolean  required,     /*if param is required*/
              optional;
         boolean  singleItem,    /*if the param must be a list*/
              listOfItems;
         boolean  notEnumerated,   /*if the type is enumerated */
              enumerated;
         boolean  isNamed,      /*indicates if this should be the */
              isUnnamed;     /* unnamed parameter; only one */
                       /* parameter can be so marked; set to */
                       /* reserved if not required*/
         boolean  reserved;     /*these 9 bits are reserved ; */
         boolean  reserved;     /*set them to "reserved"*/
         boolean  reserved;
         boolean  reserved;
         boolean  reserved;
         boolean  reserved;
         boolean  reserved;
         boolean  reserved;
         boolean  reserved;
         boolean  notFeminine,   /*feminine; set to reserved if not */
              feminine;     /*required*/
         boolean  notMasculine,   /*masculine; set to reserved if not */
              masculine;    /*required*/
         boolean  singular,
              plural;      /*plural*/
        }
     }
     integer = $$Countof(Classes);
     array Classes {
       pstring;            /*human-language name for class*/
       align word;          /*alignment*/
       literal longint;        /*class ID*/
       pstring;            /*class description*/
       align word;          /*alignment*/
       integer = $$Countof(Properties);
       array Properties {
        pstring;          /*human-language name for property*/
        align word;         /*alignment*/
        literal longint;      /*property ID*/
        literal longint;      /*property class*/
        pstring;          /*property description*/
        align word;         /*alignment*/
        boolean  reserved;     /*reserved*/
        boolean  singleItem,    /*if the property must be a list */
             listOfItems;
        boolean  notEnumerated,   /*if the type is enumerated*/
             enumerated;
        boolean  readOnly,     /*can only read it*/
             readWrite;     /*can read or write it*/
        boolean  reserved;     /*these 9 bits are reserved;*/
        boolean  reserved;     /*set them to "reserved"*/
        boolean  reserved;
        boolean  reserved;
        boolean  reserved;
        boolean  reserved;
        boolean  reserved;
        boolean  reserved;
        boolean  reserved;
        boolean  notFeminine,    /*feminine; set to reserved if not */
             feminine;     /*required*/
        boolean  notMasculine,   /*masculine; set to reserved if not */
             masculine;     /*required*/
        boolean  singular,
             plural;      /*plural*/
      }
      integer = $$Countof(Elements);
      array Elements {
        literal longint;       /*element class*/
          integer = $$Countof(KeyForms);
          array KeyForms {    /*list of key forms*/
            literal longint
            formAbsolutePosition = 'indx',
            formName = 'name'; /*key form ID*/
          }
        }
     }
     integer = $$Countof(ComparisonOps);
     array ComparisonOps {
        pstring;           /*human-language name for*/
                      /* comparison operator*/
        align word;         /*alignment*/
        literal longint;       /*comparison operator ID*/
        pstring;           /*comparison operator description*/
        align word;         /*alignment*/
     }
     integer = $$Countof(Enumerations);
     array Enumerations {       /*list of enumerations*/
        literal longint;       /*enumeration ID*/
        integer = $$Countof(Enumerators);
        array Enumerators {     /*list of enumerators*/
          pstring;        /*human-language name for enumerator*/
          align word;       /*alignment*/
          literal longint;    /*enumerator ID*/
          pstring;        /*enumerator description*/
          align word;       /*alignment*/
        }
     }
   }
}


ΓòÉΓòÉΓòÉ 9.6. Creating an OSA Event Terminology Extension Resource ΓòÉΓòÉΓòÉ

Scriptable applications must include an OSA event terminology extension (aete)
resource. You use an aete resource to inform scripting components about the
extent of your application's support for the standard OSA event suites, any
custom OSA events or OSA event objects defined by your application, and the
corresponding human-language terms for use in scripts that control your
application.

The format of the aete resource is identical to that of the aeut resource,
although it serves a different purpose. The aeut resource maps human-language
names to IDs, keywords, and other codes used in the OSA events described by the
current edition of the OSA Event Registry: Standard Suites. The aete resource
for an application uses the same format to accomplish the following:

     Indicate when a set of definitions for a particular suite included in the
      aeut resource is supported in its entirety by the application. For
      example, an application can indicate that it supports all of the aeut
      resource definitions for the Required and Core suites simply by
      identifying the suite as a whole in its aete resource; the detailed
      information for each standard suite does not need to be repeated.

     Describe extensions, if any, to the definitions included in the aeut
      resource, such as additional parameters for standard OSA events,
      additional properties and element classes for standard object classes,
      and additional key forms for each element class. For example, an
      application can indicate that it supports all of the definitions for the
      Required and Core suites included in the aeut resource, an additional
      parameter for one of the core events defined in the aeut resource, and an
      additional property for one of the core object classes defined in the
      aeut resource.

     Describe the standard OSA events and object classes that belong to suites
      the application does not support in their entirety.

     Describe the application's custom suite-that is, the application's custom
      OSA events and object classes, if any.

 By specifying a suite ID, suite level, and suite version, your application can
 indicate that it supports an entire suite. Because the aeut resource provided
 by each scripting component lists the human-language terms for all the
 standard suites, you do not have to repeat this information if you support a
 suite in its entirety. If you support a subset of a standard suite, you must
 list all the OSA events, OSA event parameters, object classes, and so on and
 equivalent human-language terms for the parts of the suite your application
 does support.

 You can include at most one aete resource per application or per module. The
 language code for this resource must match the language code of the language
 for which you are developing your application. Applications that support
 additional modules with their own aete resources must provide an scsz resource
 and handle the Get AETE event as described in Handling the Get AETE Event.

 Important:  Each human-language term supported by an application should
 correspond to a unique OSA event ID, keyword, or other code in either the
 application's aete resource or the aeut resource. For example, since the aeut
 resource defines "size" as the human-language equivalent for the property
 identified by the four-character code ptsz (the pPointSize property of text
 objects), an application's aete resource must not define "size" as the
 human-language equivalent for some other part of an OSA event or object class.
 However, more than one human-language term can correspond to the same OSA
 event ID or code. For example, an application's aete resource can define a
 second human-language term, "point size," that corresponds to the OSA event
 identifier ptsz.

 The previous section, Structure of OSA Event Terminology Resources, describes
 the basic format used by both the aeut and aete resources.

 The sections that follow provide examples of aete resources.


ΓòÉΓòÉΓòÉ 9.6.1. Supporting Standard Suites without Extensions ΓòÉΓòÉΓòÉ

To indicate that your application supports a standard suite in its entirety,
without any extensions, your aete resource needs to provide only the
information that identifies the suite. For example, the following code fragment
shows the Rez input for an aete resource provided by an application that
supports the entire Required and Core suites with no omissions or extensions.

Every aete resource must provide the major and minor version numbers for the
content of the resource (1 and 0 in the following code fragment) and the
language code (English in the following code fragment). For each suite that an
application supports in its entirety, without extensions, the aete resource
provides only the name, suite description, suite ID, suite level (1 for all
current suites), and suite version (1 for all current suites). If the aete
resource provides an empty string as the human-language name for such a suite,
a scripting component uses the name provided for the corresponding suite by the
aeut resource. If an application does not extend or omit any of the definitions
in a standard suite, a scripting component can get the rest of the information
about the suite-its event and object class definitions, comparison operators,
and enumerated groups-from the aeut resource. The corresponding arrays in the
aete resource can therefore be left empty.

Note that the Rez input for resources does not include the align word fields
shown in the aeut resource type declaration in the previous code fragment. Rez
takes care of word alignment automatically.

resource aete (0, "JustTwoSuites") {
   1, /*major version in BCD*/
   0, /*minor version in BCD*/
   english, /*language code*/
   roman, /*script code*/
   {   /*array Suites: 2 elements*/
     /*[1]*/
     "", /*human-language name for suite; */
       /* aeut supplies "Required Suite"*/
     "Events that every application should support", /*suite description*/
     kAERequiredSuite, /*suite code*/
     1, /*suite level*/
     1, /*suite version*/
     {   /*array Events: 0 elements*/
     },
     {   /*array Classes: 0 elements*/
     },
     {   /*array ComparisonOps: 0 elements*/
     },
     {   /*array Enumerations: 0 elements*/
     },
     /*[2]*/
     "", /*human-language name for suite; */
       /* aeut supplies "Core Suite"*/
     "Suite that applies to all applications", /*suite description*/
     kAECoreSuite, /*suite code*/
     1, /*suite level*/
     1, /*suite version*/
     {   /*array Events: 0 element*/
     },
     {   /*array Classes: 0 elements*/
     },
     {   /*array ComparisonOps: 0 elements*/
     },
     {   /*array Enumerations: 0 elements*/
     }
   }
}


ΓòÉΓòÉΓòÉ 9.6.2. Extending the Standard Suites ΓòÉΓòÉΓòÉ

If, like the aete resource shown in the figure in section Supporting Standard
Suites without Extensions, your application's aete resource indicates that you
support an entire standard suite, the scripting component automatically makes
use of all the terminology for that suite provided by its aeut resource. For
this reason, you can easily extend the definitions for a suite that your
application supports in its entirety: just provide arrays in the aete resource
for the definitions not already included in the aeut resource. For example, if
you are extending the definition of an event to support a single additional
parameter, you should provide an array of parameters that includes one item:
the description of the new parameter. Similarly, if you are not extending the
contents of a particular array, you do not need to include the array in the
aete resource.

Although an array of descriptions in an aete resource need not include
descriptions that are already provided by the aeut resource, you must include
information that defines the position of the array in relation to the other
information in the aete resource. As the table in section Structure of OSA
Event Terminology Resources shows, you can nest the arrays in an aete resource
within other arrays: for example, an array of parameters is part of the
description of an event, and the event description is, in turn, part of the
array of event descriptions for a suite.

To add a description of a single new parameter to the definition of an OSA
event in a suite that your application supports in its entirety, you need to
provide:

     An array of parameters containing one element: the description of the new
      parameter
     Information that identifies the event definition to which you are adding
      the parameter
     Information that identifies the suite containing the event

 The following code fragment illustrates how this works. This Rez input adds
 two new parameters ("number of copies" and "print quality") to the Print
 Documents event in the Required suite, one enumeration (three values for the
 "print quality" parameter of the Print Documents event) to the Required suite,
 and a new property ("first indent") to the cParagraph class in the Text suite.
 It also adds a plural synonym for the cParagraph class: the word "paragraphs."

  #define keyMyNumberOfCopies  'numc'
  #define keyMyPrintQuality   'prtq'
  #define typePrintQuality   'pqen'
  #define kFast         'fast'
  #define kNormal        'nrml'
  #define kHighQuality     'hiql'
  #define pFirstIndent     'indt'

  resource 'aete' (0, "SuiteExtensions") {
     1, /*major version in BCD*/
     0, /*minor version in BCD*/
     english, /*language code*/
     roman, /*script code*/
     {   /*array Suites: 3 elements*/
       /*[1]*/
       "", /*human-language name for suite; */
         /* 'aeut' supplies "Required Suite"*/
       "Events that every application should support", /*suite description*/
       kAERequiredSuite, /*suite code*/
       1, /*suite level*/
       1, /*suite version*/
       {   /*array Events: 1 element*/
          /*[1]*/
          "", /*human-language name for event; */
            /* 'aeut' supplies "Print Documents"*/
          "Print the specified list of documents", /*event description*/
          kCoreEventClass, /*event class*/
          kAEPrintDocuments, /*event ID*/
          noReply, /*reply type*/
          "", /*reply description*/
          replyOptional, /*reply is optional*/
          singleItem, /*reply must be single item*/
          notEnumerated, /*type is not enumerated*/
          reserved, /*these 13 bits are reserved*/
          reserved,
          reserved,
          reserved,
          reserved,
          reserved,
          reserved,
          reserved,
          reserved,
          reserved,
          reserved,
          reserved,
          reserved,
          typeAlias,       /*direct parameter type*/
          "List of documents to print", /*direct parameter description*/
          directParamRequired,  /*direct parameter is required*/
          listOfItems,      /*direct parameter must be list*/
          notEnumerated,     /*type is not enumerated*/
          doesntChangeState,   /*event does not change server's state*/
          reserved,       /*these 12 bits are reserved*/
          reserved,
          reserved,
          reserved,
          reserved,
          reserved,
          reserved,
          reserved,
          reserved,
          reserved,
          reserved,
          reserved,
          {   /*array OtherParams: these fields describe the additional */
            /* parameters Number of Copies and Print Quality to the */
            /* standard Print Documents event*/
            /*[1]*/
            "number of copies", /*human-language name for parameter*/
            keyMyNumberOfCopies, /*parameter keyword*/
            typeShortInteger, /*parameter type*/
            "Number of copies to print", /*parameter description*/
            optional, /*parameter is optional*/
            singleItem, /*parameter must be single item*/
            notEnumerated, /*type is not enumerated*/
            reserved, /*these 13 bits are reserved*/
            reserved,
            reserved,
            reserved,
            reserved,
            reserved,
            reserved,
            reserved,
            reserved,
            reserved,
            reserved,
            reserved,
            reserved,
            /*[2]*/
            "print quality",   /*human-language name for parameter*/
            keyMyPrintQuality,  /*parameter keyword*/
            typePrintQuality,   /*parameter type*/
            "The quality of the printing",  /*parameter description*/
            optional,       /*parameter is optional*/
            singleItem,      /*parameter must be single item*/
            enumerated,      /*type is enumerated*/
            reserved,       /*these 13 bits are reserved*/
            reserved,
            reserved,
            reserved,
            reserved,
            reserved,
            reserved,
            reserved,
            reserved,
            reserved,
            reserved,
            reserved,
            reserved
          }
       },
       {   /*array Classes: 0 elements*/
       },
       {   /*array ComparisonOps: 0 elements*/
       },
       {   /*array Enumerations: 1 element*/
          /*these fields add the 'pqen' enumeration to the Required suite*/
          /*[1]*/
          typePrintQuality, /*enumeration ID*/
          {   /*array Enumerators: 3 elements*/
            /*[1]*/
            "Fast", /*enumerator name*/
            kFast, /*enumerator ID*/
            "Print as quickly as possible",  /*enumerator description */
            /*[2]*/
            "Normal", /*enumerator name*/
            kNormal, /*enumerator ID*/
            "Print at normal speed", /*enumerator description */
            /*[3]*/
            "High-Quality", /*enumerator name*/
            kHighQuality, /*enumerator ID*/
            "Print at highest quality possible" /*enumerator description */
          }
       },
       /*[2]*/
       "", /*human-language name for suite; */
         /* 'aeut' supplies "Core Suite"*/
       "Suite that applies to all applications", /*suite description*/
       kAECoreSuite, /*suite code*/
       1, /*suite level*/
       1, /*suite version*/
       {   /*array Events: 0 elements*/
       },
       {   /*array Classes: 0 elements*/
       },
       {   /*array ComparisonOps: 0 elements*/
       },
       {   /*array Enumerations: 0 elements*/
       },
       /*[3]*/
       "", /*human-language name for suite; */
         /* 'aeut' supplies "Text Suite"*/
       "A set of basic classes for text processing", /*suite description*/
       kAETextSuite, /*suite code*/
       1, /*suite level*/
       1, /*suite version*/
       {   /*array Events: 0 elements*/
       },
       {   /*array Classes: 1 element*/
          /*[1]*/
          "paragraph", /*human-language name for class*/
          cParagraph, /*class ID*/
          "A paragraph", /*class description*/
          {   /*array Properties: 1 element*/
            /*[1]*/
            "first indent",   /*human-language name for property*/
            pFirstIndent,    /*property ID*/
            cLongInteger,    /*property class*/
            "First indent of paragraph in points",/*property description*/
            reserved,      /*reserved*/
            singleItem,     /*property is single item*/
            notEnumerated,    /*type is not enumerated*/
            readWrite,      /*property can be modified*/
            reserved,      /*these 12 bits are reserved*/
            reserved,
            reserved,
            reserved,
            reserved,
            reserved,
            reserved,
            reserved,
            reserved,
            reserved,
            reserved,
            reserved
          },
          {   /*array Elements: 0 elements*/
          },
          "paragraphs", /*human-language name for class*/
          cParagraph        , /*class ID*/
          "Every paragraph", /*class description*/
          {   /*array Special Properties: 1 element*/
            /*[1]*/
            "", /*human-language name for property*/
            kAESpecialClassProperties,  /*property ID*/
            cType,            /*property class*/
            "",             /*property description*/
            reserved,          /*reserved*/
            singleItem,         /*property is single item*/
            notEnumerated,        /*type is not enumerated*/
            readOnly,          /*property cannot be modified*/
            reserved,          /*these 11 bits are reserved*/
            reserved,
            reserved,
            reserved,
            reserved,
            reserved,
            reserved,
            reserved,
            reserved,
            reserved,
            reserved,
            plural   /*human-language name is plural form*/
          },
          {   /*array Elements: 0 elements*/
          },
       },
       {   /*array ComparisonOps: 0 elements*/
       },
       {   /*array Enumerations: 0 elements*/
       }
     }
  }

 In the previous code fragment, the possible values for the "print quality"
 parameter belong to an enumeration. This is indicated by the term enumerated
 in the parameter description. For this reason, the parameter type field
 contains the ID for the enumeration-typePrintQuality.

 The previous code fragment also adds a plural synonym for "paragraph" to the
 array of classes: the word "paragraphs." Note that this is listed as if it
 were an additional class, except that it also specifies cParagraph as the
 class ID. The first property listed for the synonym has property ID
 kAESpecialClassProperties. This property describes characteristics of the
 class as a whole; the last flag bit for this property is set to plural,
 indicating that the term paragraphs is a plural term for the specified class.
 This property must always be the first property listed for a class. For more
 information about the kAESpecialClassProperties property, see Property Data.

 An enumeration is described only by its ID; its declaration does not include a
 name or description field. However, a name, value, and description must be
 provided for each of the enumerators in an enumeration.

 You can use the method illustrated in the following figure only to add to the
 definitions of OSA events and OSA event object classes, not to support subsets
 of them. For example, to support only a subset of the parameters of an OSA
 event or only some of the elements or properties of an existing object class,
 you must list all the definitions from that suite that you do support. The
 next section provides more information about how to do this.

 Human-language names for OSA events, object classes, and so on (including
 extensions) can include both uppercase and lowercase letters and spaces. For
 comparison purposes, case does not matter. However, note that the
 human-language names defined in the following figure are all lowercase. This
 convention ensures that scripts in which these terms appear will not have
 capital letters in unexpected places.

 Scripting components that get identifiers or strings from user terminology
 resources are free to change the identifiers or strings as necessary
 (eliminating spaces, converting identifiers to all uppercase or lowercase, or
 changing the identifiers altogether) to meet the requirements of a particular
 task.


ΓòÉΓòÉΓòÉ 9.6.3. Supporting Subsets of Suites ΓòÉΓòÉΓòÉ

Your application is not required to support all the definitions in a suite. If
you wish to support a subset of the definitions in one or more standard suites,
you can collect individual definitions from any number of suites in a
placeholder suite whose suite ID is the application's signature or typeWildCard
(****). When you support a subset of a suite, you must provide all the
definitions you want to support in your aete resource.


ΓòÉΓòÉΓòÉ 9.6.4. Supporting New Suites ΓòÉΓòÉΓòÉ

If your application defines its own custom OSA events or other OSA event
constructs, you should include a separate suite section for the suite in the
aete resource. You should use your application's signature for both the suite
ID and the class ID of all events in the suite.


ΓòÉΓòÉΓòÉ 9.7. Handling the Get AETE Event ΓòÉΓòÉΓòÉ

A scripting component sends the Get AETE event to an application when it needs
information about the user terminology specified by the application. For
example, the Object REXX component sends the Get AETE event when it first
attempts to compile a tell statement that specifies a particular application.
If your application does not handle the Get AETE event, the scripting component
reads the terminology information it needs directly from your application's
aete resource. Applications that support additional plug-in modules, each with
its own aete resource, must provide an scsz resource and a handler for the Get
AETE event that collects the aete resources from the modules that are currently
running.

If your application does provide separate plug-in modules, the Get AETE event
allows it to gather information from the aete resources for the modules that
are currently running and return the terminology information along with your
application's built-in terminology information to the scripting component in
the reply event.

Here is a summary of the structure of a Get AETE event:

Get AETE-Get an application's aete resource

 Event class                   kASObject REXXClass

 Event ID                      kGetAETE

 Required parameter

   Keyword:                    keyDirectObject

   Descriptor type:            typeInteger

   Data:                       Language code

 Required reply parameter

   Keyword:                    keyDirectObject

   Descriptor type:            typeAEList or typeAETE

   Data:                       The application's terminologies

 Description                   Sent by a scripting component to an application
                               when the scripting component needs information
                               about the application's user terminology

 Your application cannot handle the Get AETE event unless it is running. If
 your application does not provide a handler for the Get AETE event, the
 scripting component can obtain terminology information directly from your
 application's aete resource even if your application is not running.

 If your application handles the Get AETE event, it must also provide a
 scripting size resource. A scripting size resource is a resource of type scsz
 that provides information about an application's capabilities for use by
 scripting components. It allows your application to declare whether it needs
 the Get AETE event and to specify preferences for the sizes of the portion of
 your application's heap used by a scripting component. For information about
 the scsz resource, see Scripting Size Resource.

 A handler for the Get AETE event should perform the following tasks:

     Obtain the language code specified by the event.

     Create a descriptor list to hold the aete resources.

     Collect the aete resources from all the application's plug-in modules
      that are currently running, including the application itself, and add
      them to the list.

     Add the list to the reply OSA event.

 The following code fragment provides an example of a handler for the Get AETE
 event.

  OSErr MyGetAETE (OSAEvent theAE, OSAEvent theReply, long refCon)
  {
  AEDescList    theList;
  DescType     returnedType;
  Size       actualSize;
  INT       languageCode;
  OSErr      myErr;

    myErr = errAEEventNotHandled;
    languageCode = 0;

    /* if a reply was not requested, then do not handle */
    if (theReply.dataHandle == NULL)
     return (myErr);

    /* get the language code that Object REXX is requesting so that */
    /* this function can return the aete of a specified language */
    myErr = AEGetParamPtr(&theAE, keyDirectObject, typeLongInteger, &returnedType,
               &languageCode, sizeof(long), &actualSize);
    if (myErr != noErr)
     return (myErr);

    /* create a list */
    myErr = AECreateList(NULL, 0, FALSE, &theList);
    if (myErr != noErr)
     return (myErr);

    /* get the requested 'aete' resources and put in the list--the */
    /* MyGrabAETE application-defined function does this */
    /* your code should iterate all of your installed code */
    /* extensions and add the aete for each that matches the */
    /* language code requested */
    myErr = MyGrabAETE(languageCode, theList);
    if (myErr != noErr) {
     myErr = AEDisposeDesc(&theList);
     return (myErr);
    }

    /* add list to reply OSA event */
    myErr = AEPutParamDesc(&theReply, keyDirectObject, &theList);
    myErr = AEDisposeDesc(&theList);
    return (myErr);
  }

 The MyGetAETE handler in the previous code fragment begins by setting the
 function result to errAEEventNotHandled. The function is set to this result if
 for any reason the handler does not successfully handle the event, so that a
 system handler provided by the scripting component can at least read the
 terminology information directly from the application's own aete resource. The
 handler in the previous code fragment then checks the language code specified
 by the event. After checking to make sure the reply exists, the handler
 creates a list and uses the application-defined function MyGrabAETE to collect
 all the appropriate terminology information and append it to the list. The
 MyGetAETE handler then adds the list to the reply event.


ΓòÉΓòÉΓòÉ 9.8. Reference to OSA Event Terminology Resources ΓòÉΓòÉΓòÉ

The figure in section Structure of OSA Event Terminology Resources shows the
complete resource type declaration in Rez format for the aeut resource. The
same resource structure is used by both the aeut and aete resources. The
following figure shows the format of a compiled aeut or aete resource.

Anaeutoraeteresourcecontainsthefollowing :

     Header containing the version and language code of the template and a
      count of the number of suites the resource describes

     Variable number of suite descriptions

 The sections that follow describe the content of the header and each suite
 description in detail.


ΓòÉΓòÉΓòÉ 9.8.1. Header Data for an OSA Event Terminology Resource ΓòÉΓòÉΓòÉ

The header for an aeut or aete resource specifies the version of its contents,
the language of the human-language equivalents contained in the resource, a
script code, and a count of the number of suites the resource describes. The
following figure shows the header format.

Theheadercontainsthefollowingitems :

     The major version number of the content of the resource in binary-coded
      decimal (the major version number for the first release of the aeut
      resource is 1). The major and minor versions describe the content of the
      resource, not its template. You can use these fields to provide version
      numbers for the content of your application's aete resource.

     The minor version number of the template in binary-coded decimal (the
      minor version number for the first release of the aeut resource is 0).

     The language code for the resource. This code must be the same as the
      resource ID for the resource.

     The script code for the resource.

     A count of the number of suites described by the resource.


ΓòÉΓòÉΓòÉ 9.8.2. Suite Data for an OSA Event Terminology Resource ΓòÉΓòÉΓòÉ

Each item in the array of suites for an aeut or aete resource includes
information about the suite ID, level, and version and four arrays that specify
the events, object classes, comparison operators, and enumerations for that
suite. The following figure shows the format of this suite data.

The data for each suite consists of the following items:

     The human-language name of the suite. This is a Pascal string that can
      include any characters, including uppercase and lowercase letters and
      spaces. If the aete resource specifies the name as an empty string, the
      scripting component looks up, in its aeut resource, the suite name and
      other suite data that correspond to the specified suite ID, suite level,
      and suite version. This strategy simplifies specification of an entire
      suite and facilitates localization, because the human-language name is
      provided by the aeut resource.

      If the aete resource specifies a name other than the name provided by the
      aeut resource for the same suite ID, suite level, and suite version, the
      scripting component uses the new name with the same suite data from the
      aeut resource. Unless you are defining a custom suite, you should specify
      an empty string for the name of a suite.

     A human-language description of the suite. This is a Pascal string that
      can include any characters. When the resource description is compiled,
      the resource compiler pads the string and aligns the next field on a word
      boundary.

     A four-character ID that distinguishes the suite from all other suites
      defined in either the aeut or aete resources. This value is normally the
      same as the event class for the OSA events in the suite.

      If the aete resource specifies a standard suite name but a suite ID that
      is different from the suite ID for the standard suite of that name
      described in the aeut resource, the scripting component uses the new
      suite ID with the standard suite data for the specified name. In general,
      you should use the standard suite ID for any standard suite that you
      support.

      If your application uses a custom suite, you should use your
      application's signature as the event class for the events in the suite
      and, in addition, as its suite ID. When you register your application's
      signature with Developer Technical Support, the corresponding event class
      is automatically registered for your application, and only you can
      register events that belong to that event class. For information about
      registering OSA events, contact the OSA Event Registrar.

     The level and version of the suite. For the first version of any suite,
      the level is usually 1 (indicating that it is the suite that contains the
      most basic definitions) and the version is 1 (the version of this suite
      level). More advanced suites (such as a suite for performing more
      sophisticated text manipulation than the current Text suite allows) will
      have level numbers greater than 1. All currently defined suites have a
      level of 1 and a version of 1.

     A count of the events defined for this suite and an array of event
      definitions.

     A count of the object classes defined for this suite and an array of
      class definitions.

     A count of the comparison operators defined for this suite and an array
      of comparison operator definitions.

     A count of the enumerations defined for this suite and an array of
      enumeration definitions.


ΓòÉΓòÉΓòÉ 9.8.2.1. Event Data ΓòÉΓòÉΓòÉ

Each item in the array of events for a suite specified in an aeut or aete
resource includes information about the event, the reply, and the direct
parameter, and an array that specifies the additional parameters for the event.
The following figure shows the format of this event data.

The data for each event consists of the following items:

     The human-language name of the event. This is a Pascal string that can
      include any characters, including uppercase and lowercase letters and
      spaces. If the aete resource specifies the name as an empty string, the
      scripting component looks up, in its aeut resource, the event name and
      other event data that correspond to the specified event class and event
      ID. This strategy facilitates localization, since the human-language name
      is provided by the aeut resource. In this case, the scripting component
      will use the standard data from the aeut resource for the event plus the
      data provided by the aete resource for any additional parameters.

      If the aete resource specifies a name other than the name provided by the
      aeut resource for the same event class and event ID, the scripting
      component uses the new name with the same suite data from the aeut
      resource. You should specify an empty string for the name of any standard
      event that your application lists explicitly in its aete resource.

     A human-language description of the event. This is a Pascal string that
      can include any characters. When the resource description is compiled,
      the resource compiler pads the string and aligns the next field on a word
      boundary.

     The four-character event class for the event. If the aete resource
      specifies a standard event name and an event class other than the event
      class for the equivalent standard event, the scripting component uses the
      new event class with the standard event data for the specified name. You
      should specify the standard event class for any standard event that your
      application lists explicitly in its aete resource.

     The four-character event ID for the event. If the aete resource specifies
      a standard event name and an event ID other than the event ID for the
      equivalent standard event, the scripting component uses the new event ID
      with the standard event data for the specified name. You should specify
      the standard event ID for any standard event that your application lists
      explicitly in its aete resource.

     A four-character descriptor type for the direct parameter of the reply.
      If the event never needs a reply, or if the reply does not include a
      direct parameter, this value must be typeNull. Otherwise, the meaning of
      this field varies according to the values of two of the flags that
      follow. One flag specifies whether the parameter is a list (singleItem or
      listOfItems), and the other specifies whether the values for the
      parameter are enumerated (enumerated or notEnumerated):

        -  If the parameter is not a list and its values are not enumerated,
           this value is the descriptor type for the direct parameter.

        -  If the parameter is a list and its values are not enumerated, this
           value is the descriptor type for each of the items in the list. (If
           not all the items in the list are of the same descriptor type, the
           flag specifying whether the value is a list must have the value
           singleItem, and the value of this field must be typeAEList.)

        -  If the parameter is not a list and its values are enumerated, this
           value is the four-character code for the enumeration defined in
           either the aete or aeut resource that contains the allowable values
           for the parameter. (If the values are enumerated but the enumeration
           is not defined in either the aete or aeut resource, the flag
           specifying whether the parameter's values are enumerated must have
           the value notEnumerated, and the value of this field must be
           typeEnumerated.)

        -  If the parameter is a list and its values are enumerated, this value
           is the four-character code for the enumeration defined in the same
           resource that contains the allowable values for all of the items in
           the list. All items in the list must have one of these enumerated
           values.

     A human-language description of the direct parameter of the reply. This
      is a Pascal string that can include any characters. Although the reply
      may include other parameters, only the direct parameter of the reply is
      described here. When the resource description is compiled, the resource
      compiler aligns the string on a word boundary.

     Flags that specify the following as Boolean values:

        -  Whether the direct parameter of the reply is required
           (replyRequired) or optional (replyOptional).

        -  Whether the direct parameter of the reply is a single item
           (singleItem) or a list of items (listOfItems). (See the earlier
           description of the reply event's four-character descriptor type for
           information about how this value changes the meaning of the reply
           type.)

        -  Whether named constants, called enumerators, are specified as the
           only valid values for the direct parameter of the reply (enumerated
           or notEnumerated). (See the earlier description of the
           four-character descriptor type for the reply event's direct
           parameter for information about how this value changes the meaning
           of the direct parameter type.) For information about specifying
           enumerators, see Enumeration and Enumerator Data.

        -  Following 5 bits are reserved for future use. The values of these
           bits must be set to reserved.

        -  Following 7 bits are reserved for future use as dialect-specific
           flags. The values of these bits must be set to reserved.

        -  Whether the event is a nonverb event (nonVerbEvent). This bit is
           used by dialects that make this distinction. For all other dialects,
           set the value of this bit to reserved.

     A four-character descriptor type for the direct parameter of the event.
      If the event never has a direct parameter, this value must be typeNull.
      Otherwise, the meaning of this field varies according to the values of
      two of the flags that follow. One flag specifies whether the parameter is
      a list (singleItem or listOfItems), and the other specifies whether the
      values for the parameter are enumerated (enumerated or notEnumerated):

        -  If the parameter is not a list and its values are not enumerated,
           this value is the descriptor type for the direct parameter.

        -  If the parameter is a list and its values are not enumerated, this
           value is the descriptor type for each of the items in the list. (If
           not all the items in the list are of the same descriptor type, the
           flag specifying whether the value is a list must have the value
           singleItem, and the value of this field must be typeAEList.)

        -  If the parameter is not a list and its values are enumerated, this
           value is the four-character code for the enumeration defined in
           either the aete or aeut resource that contains the allowable values
           for the parameter. (If the values are enumerated but the enumeration
           is not defined in either the aete or aeut resource, the flag
           specifying whether the parameter's values are enumerated must have
           the value notEnumerated, and the value of this field must be
           typeEnumerated.)

        -  If the parameter is a list and its values are enumerated, this value
           is the four-character code for the enumeration defined in the same
           resource that contains the allowable values for all of the items in
           the list. The values of the items in the list must all be one of
           these enumerated values.

     A human-language description of the direct parameter. This is a Pascal
      string that can include any characters. When the resource description is
      compiled, the resource compiler pads the string and aligns the next field
      on a word boundary.

     Flags that specify the following as Boolean values:

        -  Whether the direct parameter of the event is required
           (directParamRequired) or optional (directParamOptional).

        -  Whether the direct parameter of the event is a single item
           (singleItem) or a list of items (listOfItems). (See the earlier
           description of the direct parameter's four-character descriptor type
           for information about how this value changes the meaning of the
           direct parameter type.)

        -  Whether named constants, called enumerators, are specified as the
           only valid values for the direct parameter (enumerated or
           notEnumerated). (See the earlier description of the direct
           parameter's four-character descriptor type for information about how
           this value changes the meaning of the direct parameter type.) For
           information about specifying enumerators, see Enumeration and
           Enumerator Data.

        -  Whether receiving this event changes (changesState) or does not
           change (doesntChangeState) the internal state of the receiving
           application. Events that only get information do not change the
           state of the application, whereas events such as Cut and Move do.

        -  Following 4 bits are reserved for future use. The values of these
           bits must be set to reserved.

        -  Following 8 bits are reserved for future use as dialect-specific
           flags. The values of these bits must be set to reserved.

     A count of the additional parameters described for this event and an
      array of additional parameter definitions.


ΓòÉΓòÉΓòÉ 9.8.2.1.1. Additional Parameter Data ΓòÉΓòÉΓòÉ

Each item in the array of additional parameters for an event specified in an
aeut resource includes information about a single additional parameter. The
following figure shows the format of additional parameter data in an aeut or
aete resource.

Thedataforeachadditionalparameterconsistsofthefollowingitems :

     The human-language name of the parameter. This is a Pascal string that
      can include any characters, including uppercase and lowercase letters and
      spaces. When the resource description is compiled, the resource compiler
      pads the string and aligns the next field on a word boundary.

      If the aete resource specifies the name of an additional parameter as an
      empty string, the scripting component looks up, in its aeut resource, the
      parameter name and other parameter data that correspond to the specified
      parameter keyword. If the aete resource specifies a name other than the
      name provided by the aeut resource for the same parameter keyword, the
      scripting component uses the new name with the same parameter data from
      the aeut resource. You should specify an empty string for the name of any
      standard additional parameter that you list explicitly in an aete
      resource.

     The four-character keyword for the parameter. If the aete resource
      specifies a standard parameter name and a parameter keyword other than
      the keyword for the equivalent standard parameter, the scripting
      component uses the new parameter keyword with the standard parameter data
      for the specified name. You should specify the standard parameter keyword
      for any standard additional parameter that you list explicitly in an aete
      resource.

     A four-character descriptor type for the parameter. The meaning of this
      field varies according to the values of two of the flags that follow. One
      flag specifies whether the parameter is a list (singleItem or
      listOfItems), and the other specifies whether the values for the
      parameter are enumerated (enumerated or notEnumerated):

        -  If the parameter is not a list and its values are not enumerated,
           this value is the descriptor type for the direct parameter.

        -  If the parameter is a list and its values are not enumerated, this
           value is the descriptor type for each of the items in the list. (If
           not all the items in the list are of the same descriptor type, the
           flag specifying whether the value is a list must have the value
           singleItem, and the value of this field must be typeAEList.)

        -  If the parameter is not a list and its values are enumerated, this
           value is the four-character code for the enumeration defined in
           either the aete or aeut resource that contains the allowable values
           for the parameter. (If the values are enumerated but the enumeration
           is not defined in either the aete or aeut resource, the flag
           specifying whether the parameter's values are enumerated must have
           the value notEnumerated, and the value of this field must be
           typeEnumerated.)

        -  If the parameter is a list and its values are enumerated, this value
           is the four-character code for the enumeration defined in the same
           resource that contains the allowable values for all of the items in
           the list. The values of the items in the list must all be one of
           these enumerated values.

     A human-language description of the parameter. This is a Pascal string
      that can include any characters. When the resource description is
      compiled, the resource compiler pads the string and aligns the next field
      on a word boundary.

     Flags that specify the following as Boolean values:

        -  Whether the parameter is required (required) or optional (optional).

        -  Whether the parameter is a single item (singleItem) or a list of
           items (listOfItems). (See the earlier description of the additional
           parameter's four-character descriptor type for information about how
           this value changes the meaning of the parameter type.)

        -  Whether named constants, called enumerators, are specified as the
           only valid values for the parameter (enumerated or notEnumerated).
           (See the earlier description of the parameter's four-character
           descriptor type for information about how this value changes the
           meaning of the parameter type.) For information about specifying
           enumerators, see Enumeration and Enumerator Data.

        -  Whether the parameter is the event's only unnamed parameter
           (isUnNamed) or is named (isNamed). This bit is used by dialects such
           as Object REXX Japanese that make this distinction. For all other
           dialects, set the value of this bit to reserved.

        -  Following 4 bits are reserved for future use. The values of these
           bits must be set to reserved.

        -  Following 8 bits are reserved for future use as dialect-specific
           flags. The values of these bits must be set to reserved.

      Extending the Standard Suites includes sample Rez input for an aete
      resource that adds new parameters to a standard OSA event.


ΓòÉΓòÉΓòÉ 9.8.2.2. Object Class Data ΓòÉΓòÉΓòÉ

Each item in the array of object classes for a suite includes information about
the class and arrays that specify the properties and elements for that class.
The following figure shows the format of the object class data in an aeut or
aete resource.

The data for each object class consists of the following items:

     The human-language name of the object class. This is a Pascal string that
      can include any characters, including uppercase and lowercase letters and
      spaces. When the resource description is compiled, the resource compiler
      pads the string and aligns the next field on a word boundary.

      If the aete resource specifies the name of an object class as an empty
      string, the scripting component looks up, in its aeut resource, the class
      name and other object class data that correspond to the specified class
      ID. If the aete resource specifies a name other than the name provided by
      the aeut resource for the same class ID, the scripting component uses the
      new name with the same object class data from the aeut resource. You
      should specify an empty string for the name of any standard object class
      that you list explicitly in an aete resource.

     The four-character class ID for the object class. If the aete resource
      specifies a standard object class name and a class ID other than the
      class ID for the equivalent standard object class, the scripting
      component uses the new class ID with the standard object class data for
      the specified name. You should specify the standard class ID for any
      standard object class that you list explicitly in an aete resource.

     A human-language description of the class. This is a Pascal string that
      can include any characters. When the resource description is compiled,
      the resource compiler pads the string and aligns the next field on a word
      boundary.

     A count of the properties described for this class and an array of
      property definitions.

     A count of the element classes described for this class and an array of
      element class definitions.

 To define characteristics of an object class (for instance, whether an object
 of that class is a single item or a list of items, whether it is singular or
 plural, and so on), your application's aete resource must define a special
 property of property ID kAESpecialClassProperties as the first property in the
 array of properties. Because object class data does not include flag bits, the
 flag bits of this property are used to specify attributes for the class to
 which the property belongs. The next section describes how this property is
 defined and used.


ΓòÉΓòÉΓòÉ 9.8.2.2.1. Property Data ΓòÉΓòÉΓòÉ

Each item in the array of properties for an object class includes information
about a single property. The following figure shows the format of the property
data in an aeut or aete resource.

The data for each property consists of the following items:

     The human-language name of the property. This is a Pascal string that can
      include any characters, including uppercase and lowercase letters and
      spaces. When the resource description is compiled, the resource compiler
      pads the string and aligns the next field on a word boundary.

      If the aete resource specifies the name of a property as an empty string,
      the scripting component looks up, in its aeut resource, the property name
      and other property data that correspond to the specified property ID. If
      the aete resource specifies a name other than the name provided by the
      aeut resource for the same property ID, the scripting component uses the
      new name with the same property data from the aeut resource. You should
      specify an empty string for the name of any standard property that you
      list explicitly in an aete resource.

     The four-character property ID for the property. If the aete resource
      specifies a standard property name and a property ID other than the
      property ID for the equivalent standard property, the scripting component
      uses the new property ID with the standard property data for the
      specified name. You should specify the standard property ID for any
      standard property that you list explicitly in an aete resource.

     A four-character class ID for the object class to which the property
      belongs. The meaning of this field varies according to the values of two
      of the flags that follow. One flag specifies whether the property is a
      list (singleItem or listOfItems), and the other specifies whether the
      values for the parameter are enumerated (enumerated or notEnumerated):

        -  If the property is not a list and its values are not enumerated,
           this value is the class ID for the property.

        -  If the property is a list and its values are not enumerated, this
           value is the class ID for each of the items in the list. (If not all
           the items in the list are of the same descriptor type, the flag
           specifying whether the value is a list must have the value
           singleItem, and the value of this field must be cAEList.)

        -  If the property is not a list and its values are enumerated, this
           value is the four-character code for the enumeration defined in
           either the aete or aeut resource that contains the allowable values
           for the property. (If the values are enumerated but the enumeration
           is not defined in either the aete or aeut resource, the flag
           specifying whether the property's values are enumerated must have
           the value notEnumerated, and the value of this field must be
           typeEnumerated.)

        -  If the parameter is a list and its values are enumerated, this value
           is the four-character code for the enumeration defined in the same
           resource that contains the allowable values for all of the items in
           the list. The values of the items in the list must all be one of
           these enumerated values.

     A human-language description of the property. This is a Pascal string
      that can include any characters. When the resource description is
      compiled, the resource compiler pads the string and aligns the next field
      on a word boundary.

     Flags that specify the following as Boolean values:

        -  The first bit is reserved for future use. Its value must be set to
           reserved.

        -  Whether the property is a single item (singleItem) or a list of
           items (listOfItems). (See the earlier description of the property's
           four-character class ID for information about how this value changes
           the meaning of the class ID.)

        -  Whether named constants, called enumerators, are specified as the
           only valid values for the property (enumerated or notEnumerated).
           (See the earlier description of the property's four-character class
           ID for information about how this value changes the meaning of the
           class ID.) For information about specifying enumerators, see
           Enumeration and Enumerator Data.

        -  Whether the property's value can (readWrite) or cannot (readOnly) be
           set by the Set Data OSA event.

        -  Following 4 bits are reserved for future use.

        -  Following 5 bits are reserved for future use as dialect-specific
           flags.

        -  Whether the human-language name of the property is feminine
           (feminine) or not (notFeminine). This bit is used by dialects such
           as the Object REXX French dialect that make this distinction. For
           all other dialects, set the value of this bit to reserved.

        -  Whether the human-language name of the property is masculine
           (masculine) or not (notMasculine). This bit is used by dialects such
           as Object REXX French that make this distinction. For all other
           dialects, set the value of this bit to reserved.

        -  Whether the human-language name of the property is singular
           (singular) or plural (plural). This bit is used by dialects such as
           Object REXX French that make this distinction. If you set this bit
           to reserved, the scripting component will assign it the value
           singular.

 Extending the Standard Suites includes sample Rez input for an aete resource
 that adds a new property to a standard object class. The array of properties
 in an aeut resource begins with a definition of a special property that
 describes characteristics of the class as a whole using the flags in the
 definition of that property. A property used in this way to define
 characteristics of a class must be defined first in the array of properties
 for that class and must specify kAESpecialClassProperties (c@#!) as the
 property ID, cType as the property class, and an empty string for the property
 name and property description. If you do not define such a property for a
 class in your application's aete resource, the scripting component will assign
 that class the default values specified by the first constant for each flag
 bit in the Rez declaration for the aeut resource. (See the figure in section
 Structure of OSA Event Terminology Resources for the aeut resource type
 declaration.)


ΓòÉΓòÉΓòÉ 9.8.2.2.2. Element Class Data ΓòÉΓòÉΓòÉ

Each item in the array of elements for an object class includes information
about a single element class and an array of key forms for that element class.
The following figure shows the format of the object class data in an aeut or
aete resource.

The following statements are included for each element class in the array of
element classes for an object class:

     The four-character class ID for the element's object class.

     A count of key forms that apply to elements of this class within objects
      of the class for which these element classes are defined, followed by an
      array of key forms. Each item in the array must be a value from a special
      kfrm enumeration. (The aeut resource includes enumerators for the
      standard key forms defined in the OSA Event Registry: Standard Suites; an
      aete resource can contain kfrm enumerators for additional key forms that
      are specific to an application. For information about defining
      enumerators and enumerations, see Enumeration and Enumerator Data.) The
      enumerators for a kfrm enumeration can include indx (for the key form
      formAbsolutePosition), name (for the key form formName), ID (for the key
      form formUniqueID), prop (for the key form formPropertyID), rang (for the
      key form formRange), rele (for the key form formRelativePosition), and
      test (for the key form formTest).

 No names or descriptions are provided for element classes, because elements
 are specified by their object classes, and the declaration of each object
 class includes the name and description of the class.


ΓòÉΓòÉΓòÉ 9.8.2.3. Comparison Operator Data ΓòÉΓòÉΓòÉ

Each item in the array of comparison operators for a suite includes information
about a single comparison operator. The following figure shows the format of
the comparison operator data in an aeut or aete resource.

Note:  The Object REXX component currently does not use information about
comparison operators. Other scripting components may use this information.

The data for each comparison operator consists of the following items:

     The human-language name of the comparison operator. This is a Pascal
      string that can include any characters, including uppercase and lowercase
      letters and spaces. When the resource description is compiled, the
      resource compiler pads the string and aligns the next field on a word
      boundary.

      If the aete resource specifies the name of a comparison operator as an
      empty string, the scripting component looks up, in its aeut resource, the
      comparison operator name and other comparison operator data that
      correspond to the specified comparison operator ID. If the aete resource
      specifies a name other than the name provided by the aeut resource for
      the same comparison operator ID, the scripting component uses the new
      name with the same comparison operator data from the aeut resource. You
      should specify an empty string for the name of any standard comparison
      operator that you list explicitly in an aete resource.

     The four-character comparison operator ID for the property. If the aete
      resource specifies a standard comparison operator name and a comparison
      operator ID other than the comparison operator ID for the equivalent
      standard comparison operator, the scripting component uses the new
      comparison operator ID with the standard comparison operator data for the
      specified name. You should specify the standard comparison operator ID
      for any standard comparison operator that you list explicitly in an aete
      resource.

     A human-language description of the comparison operator. This is a Pascal
      string that can include any characters. When the resource description is
      compiled, the resource compiler pads the string and aligns the next field
      on a word boundary.

 Extending the Standard Suites includes sample Rez input for an aete resource
 that adds a comparison operator to a standard suite.


ΓòÉΓòÉΓòÉ 9.8.2.4. Enumeration and Enumerator Data ΓòÉΓòÉΓòÉ

Each item in the array of enumerations for a suite includes information about a
single enumeration and an array of enumerators for that enumeration.

The following figure shows the format of the enumeration data in an aeut or
aete resource.

The data for each enumeration consists of the following items:

     Four-character enumeration ID

     Count of constants, known as enumerators, that specify the allowable
      values for the enumeration and an array of enumerators

 The following figure shows the format of the enumerator data.

 The data for each enumerator consists of the following items:

     The human-language name of the enumerator. This is a Pascal string that
      can include any characters, including uppercase and lowercase letters and
      spaces. When the resource description is compiled, the resource compiler
      pads the string and aligns the next field on a word boundary. If the aete
      resource specifies the name of an enumerator as an empty string, the
      scripting component looks up, in its aeut resource, the enumerator name
      and other enumerator data that correspond to the specified enumerator ID.
      If the aete resource specifies a name other than the name provided by the
      aeut resource for the same enumerator ID, the scripting component uses
      the new name with the same enumerator data from the aeut resource. You
      should specify an empty string for the name of any standard enumerator
      that you list explicitly in an aete resource.

     The four-character enumerator ID for the enumerator. If the aete resource
      specifies a standard enumerator name and an enumerator ID other than the
      enumerator ID for the equivalent standard enumerator, the scripting
      component uses the new enumerator ID with the standard enumerator data
      for the specified name. You should specify the standard enumerator ID for
      any standard enumerator that you list explicitly in an aete resource.

     A human-language description of the enumerator. This is a Pascal string
      that can include any characters. When the resource description is
      compiled, the resource compiler pads the string and aligns the next field
      on a word boundary.

 Extending the Standard Suites includes sample Rez input for an aete resource
 that specifies an enumeration and an array of enumerators.


ΓòÉΓòÉΓòÉ 9.8.3. Scripting Size Resource ΓòÉΓòÉΓòÉ

If your application handles the Get AETE event, you must provide a scripting
size resource. A scripting size resource is an unsigned short value with bit
flag definitions that provides information about an application's capabilities
for use by scripting components. The following flag settings are available:

 kLaunchToGetTerminology    This bit indicates whether the aete resource of an
                            application is dynamic and configured by the
                            application when it is launched (for example, the
                            application supports add-on tools which are
                            optionally loaded during initialization).

                            If this bit is set, a scripting component or
                            application must launch the application and issue a
                            Get AETE event to obtain the application's aete
                            resource. Otherwise, the application's aete
                            resource can be read directly.

 kAlwaysSendSubject         When this bit is set, scripting components and
                            other applications that sent events to this
                            application must include a subject attribute in the
                            event.


ΓòÉΓòÉΓòÉ 10. Recording OSA Events ΓòÉΓòÉΓòÉ

This chapter describes the general characteristics of a recordable application
and provides some examples of how to factor your application for recording. It
also provides guidelines to help you decide which user actions to record and
how to record them.

Before you read this chapter, you should read the Introduction to Scripting. To
factor your application, you must know how to respond to OSA events, create and
send OSA events, and resolve and create object specifier records. For
comprehensive information about implementing OSA events, see the OSA Events,
Responding to OSA Events, Creating and Sending OSA Events, and Resolving and
Creating Object Specifier Records.

The first three sections in this chapter provide the following:

     Description of the basic requirements for recordable applications
     Examples of how to begin factoring your application
     Guidelines for what to record

 The fourth section describes how OSA event recording works. You need to read
 it only if you are developing a script editor, an application that can
 initiate recording, or a scripting component.


ΓòÉΓòÉΓòÉ 10.1. About Recordable Applications ΓòÉΓòÉΓòÉ

A recordable application is an application that uses OSA events to report user
actions to the OSA Event Manager for recording purposes. One way to do this is
to separate the code that implements your application's user interface from the
code that actually performs work when the user manipulates the interface. This
is called factoring your application. A factored application translates
low-level events generated by the user into recordable OSA events that the
application sends to itself to perform tasks.

A recordable event is any OSA event that any recordable application sends to
itself while recording is turned on for the local computer, with the exception
of events that are sent with the kAEDontRecord flag set in the sendMode
parameter of AESend. A recording process is any process (for example, the
Script Editor application) that can turn recording on and off and can receive
and record recordable OSA events.

After OSA event recording has been turned on by a recording process, the OSA
Event Manager sends that process copies of all recordable OSA events on the
local computer. For example, when a user presses the Record button in the
Script Editor application, it calls a scripting component routine to turn on
recording for the Object REXX component (or any other scripting component).
While recording is on, the OSA Event Manager sends Script Editor copies of all
subsequent recordable OSA events, which Script Editor records (with the aid of
the scripting component) in the form of a compiled script. After turning off
recording from Script Editor, the user can edit or execute the recorded script.

Although factoring your application is the recommended method of making your
application recordable, it is also possible to report user actions by means of
OSA events only when OSA event recording is turned on, even though the
application may respond to those actions by some means other than OSA events.
In effect, the application uses OSA events to describe user actions without
actually using the events to perform the action. To indicate that you want the
OSA Event Manager to send a copy of a recordable event to the recording process
without actually sending the event to your application, add the constant
kAEDontExecute to the sendMode parameter of the AESend function.

Even in a factored application, it may not always be possible to send an OSA
event that actually executes the task initiated by the user. For example, if
the user types some text, it is more practical to use standard routines to draw
the text than to send a separate OSA event each time the user presses a key. In
this case, the application can draw the text as it is typed in the most
convenient manner available; then, when the user finishes typing a sequence of
characters-by clicking the mouse button while the cursor is somewhere else in
the document or performing some other action-the application can create an OSA
event that corresponds to the typing and add the constant kAEDontExecute to the
sendMode parameter when it sends the OSA event.

If your application needs to know when OSA event recording is turned on and
off, it should install handlers for the Recording On and Recording Off events.

Recording On-perform actions associated with beginning of recording session

 Event class    kCoreEventClass

 Event ID       kAENotifyStartRecording

 Parameters     None

 Description    Sent by the OSA Event Manager to all running processes on the
                local computer to inform them that recording has been turned on

 Recording Off-perform actions associated with end of recording session

 Event class    kCoreEventClass

 Event ID       kAENotifyStopRecording

 Parameters     None

 Description    Sent by the OSA Event Manager to all running processes on the
                local computer to inform them that recording has been turned
                off

 When a recording process turns on recording, the OSA Event Manager sends all
 running processes on the local computer a Recording On event. When a user
 turns off recording, the OSA Event Manager sends all running processes the
 Recording Off event with the kAEWaitReply flag set. If an application has
 stored some data (for instance, keystrokes) that needs to be recorded as an
 OSA event, this is the last chance to send an event for recording purposes. If
 your application needs to know which recording process has turned recording on
 or off, it can check the keyOriginalAddressAttr attribute of the Recording On
 or Recording Off event for the address of the recording process.

 Factoring your application is the recommended method of making your
 application recordable because it guarantees that any action a user can
 perform via your application's user interface can also be accomplished via OSA
 events. Factoring also allows you to avoid duplicating code within your
 application. Instead of using one piece of code to respond to some user action
 within your application, and another piece of code to respond to the
 equivalent OSA event, you can use the same code to respond to the OSA event,
 whether it is sent by your application in response to a user action, by some
 other application, or by a scripting component in the course of executing a
 script.

 The next section provides some examples of how to go about factoring your
 application. Regardless of how you factor your application, making it
 recordable requires you to make decisions about the most useful methods of
 recording user actions that can be described in several different ways in
 scripts. If a user moves a window, for example, the window can be described in
 the corresponding recorded script as window 1, or the window named Fred, or
 the first window. Although OSA permits recording at a high level and thus
 avoids many of the problems users encounter with applications that record
 low-level events such as keystrokes and mouse clicks, scripting components
 cannot predict what information a user cares about in a given situation.
 Therefore, a recordable application should send OSA events that correspond to
 the simplest possible statements in a scripting language. The section What to
 Record provides some general guidelines for making these kinds of decisions.

 How OSA Event Recording Works describes the OSA Event Manager's recording
 mechanism in more detail, including the role of the Recording On and Recording
 Off events.


ΓòÉΓòÉΓòÉ 10.2. Factoring Your Application for Recording ΓòÉΓòÉΓòÉ

The recommended way to make your application recordable, or capable of sending
OSA events to itself whenever a user performs a significant action, is to
factor the code that controls your application's user interface from the code
that responds to the user's manipulation of the interface. A fully factored
application translates user actions into OSA events that the application sends
to itself to initiate tasks.

The examples that follow demonstrate how to factor code that responds to
relatively simple user actions such as creating a new document or moving a
window. They are intended only to illustrate the general approach you should
take; many of the decisions you will need to make while factoring will be
unique to your application. What to Record provides guidelines for deciding
which user actions to record and how to record them.

If you are factoring an existing application, it is usually a good idea to
begin with the required OSA events and any other OSA events that you plan to
send in order to execute commands in the File menu. You can then proceed to
other menu commands and mouse actions. If you are designing a new application
and want to make it recordable, you should build factoring into every aspect of
your application design.


ΓòÉΓòÉΓòÉ 10.2.1. Factoring the Quit Command and the New Command ΓòÉΓòÉΓòÉ

This section demonstrates how to factor two File menu commands:  Quit and New.

When the user chooses a menu command, an application first determines which one
was chosen and then performs the action associated with that command. For
example, when a user chooses Quit from the File menu, an application that is
not factored simply calls an application-defined WM_QUIT message. Because Quit
Application is one of the required OSA events, it is relatively easy for most
applications that support OSA events to factor the code that responds to the
Quit command.

After a factored application has determined that the user has chosen the Quit
command, it sends the Quit Application event to itself by calling its
MyDoMenuQuit routine.


void MyDoMenuQuit ()
{
  OSErr  myErr;
  myErr = MySendAEQuit();  /* handle any errors*/
}

The MyDoMenuQuit routine, in turn, calls the MySendAEQuit routine, shown in the
following code fragment, which creates the Quit Application event and sends it.

OSErr MySendAEQuit (DescType saveOpt)
{
  OSAEvent  myOSAEvent, defReply;
  OSErr   myErr, ignoreErr;

  /* create Quit event */
  myErr = AECreateOSAEvent(kCoreEventClass, kAEQuitApplication,
              &gSelfAddrDesc, kAutoGenerateReturnID,
              kAnyTransactionID, &myOSAEvent);
   if (myErr == noErr) {
     /* add optional parameter that specifies whether this app */
     /* should prompt user if window is dirty */
     myErr = AEPutParamPtr(&myOSAEvent, keyAESaveOptions, typeEnumerated,
                &saveOpt, sizeof(saveOpt));
   }
   if (myErr = noErr) {
     /*send event */
     myErr = AESend(&myOSAEvent, &defReply, kAENoReply, kAENormalPriority,
             kAEDefaultTimeOut, NULL, NULL);
   }
   ignoreErr = AEDisposeDesc(&myOSAEvent);

   return (myErr);
}

After the application receives the Quit Application event, the MyHandleQuit
handler shown in the following code fragment performs all the actions
associated with that event, such as saving any open documents. (Note that your
application should call the ExitToShell procedure from the main event loop, not
from your handler for the Quit Application event.)

OSErr MyHandleQuit (OSAEvent theOSAEvent, OSAEvent reply, LONG handlerRefcon)
{
  BOOL    userCanceled;
  DescType  saveOpt, returnedType;
  Size    actSize;
  OSErr    myErr;

  /* check for missing required parameters */
  myErr = MyGotRequiredParams(theOSAEvent);
  if (myErr == noErr) {
   /* pick up optional save parameter */
   saveOpt = kAEAskUser;   /* the default */
   myErr = AEGetParamPtr(&theOSAEvent, keyAESaveOptions, typeEnumerated,
              &returnedType, &saveOpt, sizeof(saveOpt), &actSize);
   if (myErr == errAEDescNotFound)
     myErr = noErr;
   return (myErr);
   if (myErr == noErr) {
     userCanceled = MyPrepareToTerminate(saveOpt);
     if (userCanceled)
       return (kUserCanceled);
   }
  }
  else
   return (myErr);
}

If recording has been turned on for a scripting component (for example, after a
user clicks the Record button in the Script Editor application) and the user
quits the application, the OSA Event Manager automatically sends the scripting
component a copy of the Quit Application event sent by the MySendAEQuit
routine. The scripting component records the event in a compiled script. When a
user executes the recorded script, the scripting component sends the same Quit
Application event to the application, which calls the MyHandleQuit function and
responds to the event just as if the user had chosen Quit from the File menu.

After you have factored the commands associated with required OSA events for an
existing application, you can move on to the other commands in the File menu,
such as New. After a factored application has determined that the user has
chosen New, it calls its MyDoMenuNew routine, which sends the Create Element
event to the application.


void MyDoMenuNew ()
{
  myErr = OSErr;

  myErr = MySendAECreateElement(gNullDesc, cDocument);
  /* handle any errors */
}

The container for the new element is the application's default container,
specified by a null descriptor record, and the desired class is cDocument. The
MyDoMenuNew routine in turn calls the MySendAECreateElement routine shown in
the following code fragment, which creates the OSA event and sends it.

OSErr MySendAECreateElement (AEDesc cont, DescType elemClass)
{
   OSAEvent  myOSAEvent, defReply;
   OSErr   myErr, ignoreErr;

   /* create Create Element event */
   myErr = AECreateOSAEvent(kCoreEventClass, kAECreateElement,
               &gSelfAddrDesc, kAutoGenerateReturnID,
               kAnyTransactionID, &myOSAEvent);
   if (myErr == noErr)
     /* add parameter that specifies insertion location for the */
     /* new element */
     myErr = AEPutParamDesc(&myOSAEvent, keyAEInsertHere, &cont);
   if (myErr == noErr)
     /* add parameter that specifies new element's object class */
     myErr = AEPutParamPtr(&myOSAEvent, keyAEObjectClass, typeType,
                &elemClass, sizeof(elemClass));
   if (myErr == noErr)
     /* send the event */
     myErr = AESend(&myOSAEvent, &defReply, kAENoReply+kAECanInteract,
             kAENormalPriority, kAEDefaultTimeOut, NULL, NULL);
   ignoreErr = AEDisposeDesc(&myOSAEvent);  /*must dispose of event */
   return (myErr);
}

For the purposes of this example, the routine shown in the previous code
fragment sends only the required parameters and can only create a new active
window with the default name. After the application receives the Create Element
event, its MyHandleCreateElement handler performs the requested action, as
shown in the following code fragment. In this case, it creates a new active
window with a default title.

OSErr MyHandleCreateElement (OSAEvent theOSAEvent, OSAEvent reply,
               long handlerRefCon)
{
   AEDesc   myCont;
   DescType  returnedType, newElemClass;
   Size    actSize;
   DescType  contClass;
   WindowPtr  window;
   OSErr    myErr;

   /* get the parameters out of the event */
   /* first get the direct parameter, which specifies insertion */
   /* location for new window--that is, frontmost window */
   myErr = AEClearDesc(&myCont);
   myErr = AEGetParamDesc(&theOSAEvent, keyAEInsertHere, typeWildCard,
              &myCont);
   if (myErr == noErr)
     /* get the other required parameter, which specifies class */
     /* cDocument when MyHandleCreateElement creates a new window */
     myErr = AEGetParamPtr(&theOSAEvent, keyAEObjectClass,
                typeType, &returnedType, &newElemClass,
                sizeof(newElemClass), &actSize);
   if (myErr == noErr)
     myErr = MyGotRequiredParams(&theOSAEvent);

   if (myErr == noErr) {
     /*check container and class, just to make sure*/
     if ((myCont.descriptorType != typeNull) || (newElemClass != cDocument))
        myErr = kWrongContainerOrElement;
     else
        /*MyNewWindow creates a new window with a default name */
        /* and returns a pointer to it in the window parameter*/
        myErr = MyNewWindow(window);
   }
   myErr = AEDisposeDesc(&myCont);
   /*if your app sends a reply in response to the Create Element */
   /* event, then set up the reply event as appropriate*/

   return (myErr);
}

If recording has been turned on for a scripting component (for example, after a
user clicks the Record button in the Script Editor application), the OSA Event
Manager automatically sends the scripting component a copy of the Create
Element event sent by the MySendAECreateElement routine. The scripting
component records the OSA event as a statement in a compiled script. When a
user executes the recorded script, the scripting component sends the same
Create Element event to the application, which calls its MyHandleCreateElement
handler and responds to the event just as if the user had chosen New from the
File menu.


ΓòÉΓòÉΓòÉ 10.2.2. Sending OSA Events without Executing Them ΓòÉΓòÉΓòÉ

If an application is fully factored, it carries out almost all the tasks a user
can perform by sending itself OSA events in the manner illustrated by the
listings in the preceding sections. However, in some cases it may not be
practical to send an OSA event that actually executes a task performed by the
user.

For example, if the user drags a window by its title bar from one position to
another, it is inefficient to send a series of OSA events that move the window
through a series of positions until the user releases the mouse button. Until
the user releases the mouse button, it is not possible to send a single OSA
event that drags the window to the new position, because the new position is
not yet known. When the WM_WINDOWPOSCHANGED message is received, the window has
already been dragged to its new position, and its window record has been
updated.

At this point your application can send itself the Set Data event that performs
the same action; but to avoid repeating the action that was just performed with
DragWindow, you should add the kAEDontExecute constant to the sendMode
parameter of the AESend function when you send the event. The OSA Event Manager
then sends the Set Data event to the recording process, if any, but does not
send it to the application.

The following example shows a code fragment from a window procedure that
illustrates this approach. The window procedure calls an application-defined
routine, MyCreateAESetWindowPos, and the AESend function to create and send a
Set Data OSA event that sets the window position to the new location. However,
because the window has already been moved, there is no need to execute the Set
Data event. To send the event for recording purposes without actually executing
it, the MyDoDragWindow routine adds the kAEDontExecute constant to the sendMode
parameter of the AESend function when it sends the Set Data event.


MRESULT EXPENTRY ClientWndProc(HWND hwnd, ULONG  msg, MPARAM mp1, MPARAM
mp2)
{
  switch(msg)
  {
   ...
  case WM_WINDOWPOSCHANGED:
     {
      PSWP pswp = (PSWP)PVOIDFROMMP(mp1); /* window position struct
ptr */

      if(pswp->fl & SWP_MOVE)  /* It is a window drag operation */
      {
        LONG   windowIndex;
        POINTL  newOrigin;
        OSAEvent theOSAEvent, theReply;

        newOrigin.x = pswp->x;
        newOrigin.y = pswp->y;
        MyGetWindowIndex(hwnd, &windowIndex);
        MyCreateAESetWindowPos(windowIndex, &newOrigin, &theOSAEvent);
        AESend(&theOSAEvent,
           &theReply,
           kAENoReply + kAECanInteract + kAEDontExecute,
           kAENormalPriority,
           kAEDefaultTimeout);
      }
      return WinDefWindowProc(hwnd, msg, mp1, mp2);
     }
     break;
   default:
     return WinDefWindowProc(hwnd, msg, mp1, mp2);
     break;
  }
}

If recording has been turned on and the user moves a window, the OSA Event
Manager automatically sends the scripting component a copy of the Set Data
event sent by the client window procedure but does not send the event to the
application. The scripting component records the event as a statement in a
compiled script. When a user executes the recorded script, the scripting
component sends the same Set Data event to the application. The application's
handler for the Set Data event then changes the position of the window.


ΓòÉΓòÉΓòÉ 10.3. What to Record ΓòÉΓòÉΓòÉ

Factoring an application involves making decisions about which user actions
generate OSA events, about the content of those events, and about when to send
events for recording purposes. For example, the preceding section describes how
an application should generate an OSA event that corresponds to a change in the
position of a window. Other actions can be more complicated to define in terms
of OSA events. This section provides general guidelines for deciding which user
actions should generate OSA events and how those events should be defined.

When the user records a series of actions as a script, playing the recorded
script back later in exactly the same circumstances must produce exactly the
same result. If the circumstances at execution time are similar but not exactly
the same as when the script was recorded, the script should also work
correctly. However, certain differences will always lead to unexpected results
or cause execution to fail.

The goal of these guidelines is to help you create scripts that will work
correctly in the largest number of circumstances with the fewest post-recording
changes by the user. To accomplish this goal, a recordable application should
send itself OSA events that describe as specifically as possible the user's
actions in the application's domain without making guesses about the user's
intentions.

The way your application uses OSA events to record a user's actions depends in
part on the kind of script being recorded. From the user's perspective, there
are at least three kinds of scripts:

     A script application. The icons for these files appear in the Desktop,
      for example, in the OSA Menu Items folder or the Startup Items folder.

     A script that functions like a menu command, usually acting on the
      current selection in the current application, and stored either as a
      compiled script file that appears in the Desktop or as a script stored
      within an application or one of its documents.

     A script that is "embedded" in an application-that is, explicitly
      associated with something in a document, such as a field in a form, a
      cell or row of a spreadsheet, or a button.

 The recording guidelines in the sections that follow apply to the recording of
 scripts that function like menu commands and scripts that are embedded in an
 application. Because such scripts are executed under a user's direct control,
 the user expects their execution to cause something to happen, possibly
 changing the current selection, the Clipboard, or the active window.

 The execution of a script application, however, may cause a scripting
 component to send events to one or more applications intermittently without
 the user's knowledge. If the script in a script application refers to the
 current selection, the Clipboard, or the active window, its execution may
 interfere with other tasks being performed by the user or tasks performed
 during the execution of other scripts. To create a script application and
 ensure that it works correctly when executed, a scripter may need to modify
 the script after it has been recorded.

 For example, to eliminate references to the Clipboard, a scripter can use a
 script variable as a user-defined Clipboard and convert Cut, Copy, and Paste
 statements to appropriate combinations of Move, Copy, New, and Delete
 statements, while supplying the previously defined selection as the argument.
 It may also be necessary to convert a description such as "the front document"
 to a specific file name or a variable.


ΓòÉΓòÉΓòÉ 10.3.1. Recording User Actions ΓòÉΓòÉΓòÉ

Two general guidelines apply to the recording of all user actions:

     Send OSA events that correspond to simple statements in a script rather
      than compound statements.

     Do not record superfluous actions.

 In most cases, if the user performs several related actions, your application
 should send OSA events for each action rather than saving the actions and
 creating an event that combines them.

 For example, if the user selects some text, cuts it, and then pastes it
 somewhere else, your application should send itself four events that
 correspond to these actions:

   1. Select the text
   2. Cut
   3. Set the insertion point
   4. Paste

 Thus, if the user selects characters 5 through 20 of the frontmost document,
 chooses the Cut command from the Edit menu, places the insertion point after
 character 72, and chooses the Paste command, your application should send the
 following events:

     A Select event (event class kAEMiscStandards, event ID kAESelect) with
      this direct parameter:

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            Γöé      keyAEContainer       Γöé      typeCurrentContainer Γöé    No data                Γöé
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            Γöé      keyAEKeyForm         Γöé      typeEnumerated       Γöé    formAbsolutePosition   Γöé
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            Γöé      keyAEKeyData         Γöé      typeLongInteger      Γöé    20                     Γöé
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     A Cut event (event class kAEMiscStandards, event ID kAECut)

     A Select event with this direct parameter:

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            ΓöéKeyword                    ΓöéDescriptor type            ΓöéData                       Γöé
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            Γöé    keyAEDesiredClass      Γöé    typeType               Γöé    cChar                  Γöé
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            Γöé      keyAEKeyForm         Γöé      typeEnumerated       Γöé      formAbsolutePosition Γöé
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            Γöé      keyAEKeyData         Γöé      typeLongInteger      Γöé      1                    Γöé
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     A Paste event

 Note:  The format used for the direct parameters in this example and
        throughout this chapter does not show the structure of the direct
        parameters as they exist within the OSA events. Instead, this format
        shows what you would obtain after calling AEGetKeyDesc repeatedly to
        extract the nested descriptor records from the OSA events.

 When you call AEGetKeyDesc to extract the descriptor record that specifies an
 application's default container, AEGetKeyDesc returns a descriptor record of
 type AEDesc with a descriptor type of typeNull and a data handle whose value
 is 0.

 The first Select event in this example sets the application's pSelection
 property (that is, the current selection) to the objects identified by the
 object specifier record in the direct parameter-characters 5 through 20. The
 second Select event places the insertion point after the object identified by
 the object specifier in the direct parameter-after character 72.

 You could also interpret these four actions as a single Move event that simply
 moves characters 5 through 20 to after character 72. A user could write such a
 statement in a script, but for recording purposes four separate events
 correspond more precisely to the user's actions. For example, if the user
 performed another paste operation after the first four actions, a Move event
 would not produce the correct results.

 It is equally important for a recordable application not to send superfluous
 events. For example, your application should not send an event every time the
 user makes a selection. Instead, it should keep track of the most recent
 selection made. When the user performs some action on the selection, the
 application should send an event that sets the selection followed by the event
 that corresponds to the action taken by the user. However, if the user does
 not perform an action on the selection, the application should not send an
 event.

 Important:  If something is already selected when recording begins, your
 application should not record that selection. Subsequent user actions should
 be recorded assuming that there is a selection. By not recording the current
 selection, you allow the user to record scripts that work, without further
 modification, much like menu commands that operate on the current selection.

 The example just discussed assumes that the application has multiple
 documents. In such an application, document 1 is always the document in the
 frontmost window. The examples that follow are simplified, as if they were
 generated by an application like TeachText that can have only one document
 open at a time and can therefore locate objects such as characters in the
 default container. For more complex applications that locate text in cells,
 documents, and other containers, you must specify additional containers, as
 appropriate.


ΓòÉΓòÉΓòÉ 10.3.2. Recording the Selection of Text Objects ΓòÉΓòÉΓòÉ

When your application needs to record a selection that the user has made by
dragging through a range of text, it should send itself a Select event that
selects a range of characters. For example, a Select event with this direct
parameter selects characters 80 through 764:

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Γöé      keyAEKeyData         Γöé      typeLongInteger      Γöé      80                   Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé    keyAERangeStop         Γöé    typeObjectSpecifier    Γöé    (see indented record)  Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé      keyAEDesiredClass    Γöé      typeType             Γöé      cChar                Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé      keyAEContainer       Γöé      typeCurrentContainer Γöé      No data              Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé      keyAEKeyForm         Γöé      typeEnumerated       Γöé      formAbsolutePosition Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé      keyAEKeyData         Γöé      typeLongInteger      Γöé      764                  Γöé
ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

It is sufficient to record such a text selection as a range of characters.
However, recording selections in other units can make the corresponding scripts
easier to read. If you decide to record text selections in other units, keep
these guidelines in mind:

     Use the largest whole unit that completely describes the selection.
     Do not mix units.
     Use units appropriate to the method of selection.
     Use logical units rather than units that vary with reformatting.
     Do not try to guess the user's intentions.

 The rest of this section provides examples of how to apply these guidelines.

 If you do record text selections in units other than characters, record each
 selection in terms of the largest whole unit that completely describes the
 selection. For example, suppose the user selects characters 115 through 170 by
 dragging. Further, suppose the selected characters are exactly the same as
 words 33 through 50 and also the same as paragraph 2. In this case your
 application should send itself a Select event with this direct parameter:

  ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
  ΓöéKeyword                    ΓöéDescriptor type            ΓöéData                       Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöékeyDirectObject            ΓöétypeObjectSpecifier        Γöé(see indented record)      Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé  keyAEDesiredClass        Γöé  typeType                 Γöé  cParagraph               Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé  keyAEContainer           Γöé  typeNull                 Γöé  No data                  Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé  keyAEKeyForm             Γöé  typeEnumerated           Γöé  formAbsolutePosition     Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé  keyAEKeyData             Γöé  typeLongInteger          Γöé  2                        Γöé
  ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

 However, if the selected characters do not match a larger unit exactly-for
 example, if paragraph 2 is larger than the selection or the selection is a
 portion of two paragraphs-use the largest unit available, in this case words.

 For example, a Select event with this direct parameter selects word 33 through
 word 45:

  ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
  ΓöéKeyword                    ΓöéDescriptor type            ΓöéData                       Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöékeyDirectObject            ΓöétypeObjectSpecifier        Γöé(see indented record)      Γöé
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  Γöé  keyAEDesiredClass        Γöé  typeType                 Γöé  cText                    Γöé
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 Do not mix units. You should not send OSA events that define selections like
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 Instead, define selections as simply as possible; for example, character 45 in
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  Γöé  keyAEDesiredClass        Γöé  typeType                 Γöé  cWord                    Γöé
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  Γöé  keyAEContainer           Γöé  typeNull                 Γöé  No data                  Γöé
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  Γöé  keyAEKeyForm             Γöé  typeEnumerated           Γöé  formAbsolutePosition     Γöé
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  Γöé  keyAEKeyData             Γöé  typeLongInteger          Γöé  5                        Γöé
  ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

 If the user double-clicks word 5 and then extends the selection through word
 9, your application should send a Select event with this direct parameter:

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  ΓöéKeyword                    ΓöéDescriptor type            ΓöéData                       Γöé
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  Γöé  keyAEDesiredClass        Γöé  typeType                 Γöé  cText                    Γöé
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  Γöé  keyAEContainer           Γöé  typeNull                 Γöé  No data                  Γöé
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  Γöé  keyAEKeyForm             Γöé  typeEnumerated           Γöé  formRange                Γöé
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  Γöé      keyAEContainer       Γöé      typeCurrentContainer Γöé      No data              Γöé
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  Γöé      keyAEKeyForm         Γöé      typeEnumerated       Γöé      formAbsolutePosition Γöé
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  Γöé      keyAEKeyData         Γöé      typeLongInteger      Γöé      5                    Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé    keyAERangeStop         Γöé    typeObjectSpecifier    Γöé    (see indented record)  Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé      keyAEDesiredClass    Γöé      typeType             Γöé      cWord                Γöé
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  Γöé      keyAEContainer       Γöé      typeCurrentContainer Γöé      No data              Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé      keyAEKeyForm         Γöé      typeEnumerated       Γöé      formAbsolutePosition Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé      keyAEKeyData         Γöé      typeLongInteger      Γöé      9                    Γöé
  ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

 If your application supports selection of a paragraph, for example by clicking
 the left margin, triple-clicking, or some other action, your application
 should send a Select event that selects the paragraph. For example, a Select
 event with this direct parameter selects paragraph 2:

  ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
  ΓöéKeyword                    ΓöéDescriptor type            ΓöéData                       Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöékeyDirectObject            ΓöétypeObjectSpecifier        Γöé(see indented record)      Γöé
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  Γöé  keyAEDesiredClass        Γöé  typeType                 Γöé  cParagraph               Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé  keyAEContainer           Γöé  typeNull                 Γöé  No data                  Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé  keyAEKeyForm             Γöé  typeEnumerated           Γöé  formAbsolutePosition     Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé  keyAEKeyData             Γöé  typeLongInteger          Γöé  2                        Γöé
  ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

 If your application supports the selection of other units (for instance,
 cells, rows, and columns in a spreadsheet; embedded graphics in a word
 processor; or buttons) and if users can select a range of such units, your
 application should record using those units when appropriate. For example, a
 Select event with this direct parameter selects row 5 through row 23:

  ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
  ΓöéKeyword                    ΓöéDescriptor type            ΓöéData                       Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöékeyDirectObject            ΓöétypeObjectSpecifier        Γöé(see indented record)      Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé  keyAEDesiredClass        Γöé  typeType                 Γöé  cRow                     Γöé
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  Γöé  keyAEContainer           Γöé  typeNull                 Γöé  No data                  Γöé
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  Γöé  keyAEKeyForm             Γöé  typeEnumerated           Γöé  formRange                Γöé
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  Γöé  keyAEKeyData             Γöé  typeRangeDescriptor      Γöé  (see indented record)    Γöé
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  Γöé    keyAERangeStart        Γöé    typeObjectSpecifier    Γöé    (see indented record)  Γöé
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  Γöé      keyAEDesiredClass    Γöé      typeType             Γöé      cRow                 Γöé
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  Γöé      keyAEContainer       Γöé      typeCurrentContainer Γöé      No data              Γöé
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  Γöé      keyAEKeyForm         Γöé      typeEnumerated       Γöé      formAbsolutePosition Γöé
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  Γöé      keyAEKeyData         Γöé      typeLongInteger      Γöé      5                    Γöé
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  Γöé    keyAERangeStop         Γöé    typeObjectSpecifier    Γöé    (see indented record)  Γöé
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  Γöé      keyAEDesiredClass    Γöé      typeType             Γöé      cRow                 Γöé
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  Γöé      keyAEContainer       Γöé      typeCurrentContainer Γöé      No data              Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé      keyAEKeyForm         Γöé      typeEnumerated       Γöé      formAbsolutePosition Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé      keyAEKeyData         Γöé      typeLongInteger      Γöé      23                   Γöé
  ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

 A Select event with this direct parameter selects the second PICT image:

  ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
  ΓöéKeyword                    ΓöéDescriptor type            ΓöéData                       Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöékeyDirectObject            ΓöétypeObjectSpecifier        Γöé(see indented record)      Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé  keyAEDesiredClass        Γöé  typeType                 Γöé  cPICT                    Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé  keyAEContainer           Γöé  typeNull                 Γöé  No data                  Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé  keyAEKeyForm             Γöé  typeEnumerated           Γöé  formAbsolutePosition     Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé  keyAEKeyData             Γöé  typeLongInteger          Γöé  2                        Γöé
  ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

 When the user chooses a Select All command, your application should send a
 Select event with this direct parameter to select the contents of the
 document:

  ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
  ΓöéKeyword                    ΓöéDescriptor type            ΓöéData                       Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöékeyDirectObject            ΓöétypeObjectSpecifier        Γöé(see indented record)      Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé  keyAEDesiredClass        Γöé  typeType                 Γöé  cProperty                Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé  keyAEContainer           Γöé  typeNull                 Γöé  No data                  Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé  keyAEKeyForm             Γöé  typeEnumerated           Γöé  formPropertyID           Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé  keyAEKeyData             Γöé  typeLongInteger          Γöé  pContents                Γöé
  ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

 Units that vary with reformatting, such as lines and pages in a text document,
 are not as useful as logical units that describe the data more precisely.
 Whenever possible, use logical units such as character, word, paragraph,
 section, and so on.

 Do not try to guess the user's intentions. For example, if a selection can be
 described as either "word 14" or as "the third bold word in paragraph 3," use
 the simpler description. If you guess the user's intentions, you will be wrong
 often enough to cause the user to distrust the recording process.


ΓòÉΓòÉΓòÉ 10.3.3. Recording Insertion Points ΓòÉΓòÉΓòÉ

The insertion point and a selection are synonymous in the Macintosh Operating
System. However, scripting languages need a way of specifying a zero-width
selection. Sometimes the best way to specify an insertion location is in
relation to another object; for example, "after word 5." This section describes
recommended methods of specifying an insertion point in a recordable event.

The insertion point can be specified in OSA events by either an insertion
location descriptor record (typeInsertionLocation) or an object specifier
record (typeObjectSpecifier) that specifies the class cInsertionLoc and the key
form formRelativePosition. The Move, Clone, and Create events accept an
insertion location descriptor record; other events, including Select and Set
Data, require an object specifier record.

Five constants can be used to describe an insertion point in relation to an
object or container:

 Constant         Corresponding Insertion Point

 kAEReplace       The specified object will be replaced if not qualified by one
                  of the other phrases

 kAEBefore        Just before the specified object (either type
                  typeObjectSpecifier or type typeInsertionLocation)

 kAEAfter         Just after the specified object (either type
                  typeObjectSpecifier or type typeInsertionLocation)

 kAEBeginning     In the specified container and before all other elements of
                  the same class in that container (type typeInsertionLocation
                  only)

 kAEEnd           In the specified container and after all other elements of
                  the same class in that container

 For more information about the way Object REXX uses insertion location
 descriptor records, see Defining Terminology for Use by the Object REXX
 Component and the OSA Event Registry: Standard Suites. The rest of this
 section provides examples of object specifier records used to specify
 insertion points.

 Users usually insert objects after some other object. So, unless the insertion
 point is clearly at the beginning or end of a container or identifies an
 object to be replaced, use the constant kAEAfter to record the location.

 For example, if the user places the insertion point after character 2, your
 application should send a Select event with this direct parameter:

  ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
  ΓöéKeyword                    ΓöéDescriptor type            ΓöéData                       Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöékeyDirectObject            ΓöétypeObjectSpecifier        Γöé(see indented record)      Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé  keyAEDesiredClass        Γöé  typeType                 Γöé  cInsertionLoc            Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé  keyAEContainer           Γöé  typeObjectSpecifier      Γöé  (see indented record)    Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé    keyAEDesiredClass      Γöé    typeType               Γöé    cChar                  Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé    keyAEContainer         Γöé    typeNull               Γöé    No data                Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé    keyAEKeyForm           Γöé    typeEnumerated         Γöé    formAbsolutePosition   Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé    keyAEKeyData           Γöé    typeLongInteger        Γöé    2                      Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé  keyAEKeyForm             Γöé  typeEnumerated           Γöé  formRelativePosition     Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé  keyAEKeyData             Γöé  typeEnumerated           Γöé  kAEAfter                 Γöé
  ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

 If the selection is not 0 characters wide, the user is replacing the selection
 with another object, so you can specify the location simply as the object
 specifier record for the object to be replaced.

 If the user clicks the white space after a paragraph somewhere in the middle
 of the document, defining the insertion point becomes more complex because
 different applications deal with this situation in different ways. Some place
 the insertion point at the end of the current paragraph, while others place
 the insertion point at the beginning of the next paragraph. Depending on the
 way your application handles this situation, you should use an object
 specifier record that specifies either kAEBeginning or kAEEnd.

 Remember that the Select event requires an object specifier record. Thus, if
 you want to place the insertion point at the beginning of a paragraph, use an
 object specifier record that specifies a location just before the first item
 of the paragraph, rather than an insertion location descriptor record.

 For example, a Select event with this direct parameter places the insertion
 point just before the first item of paragraph 3:

  ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
  ΓöéKeyword                    ΓöéDescriptor type            ΓöéData                       Γöé
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  ΓöékeyDirectObject            ΓöétypeObjectSpecifier        Γöé(see indented record)      Γöé
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  Γöé  keyAEDesiredClass        Γöé  typeType                 Γöé  cInsertionLoc            Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé  keyAEContainer           Γöé  typeObjectSpecifier      Γöé  (see indented record)    Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé    keyAEDesiredClass      Γöé    typeType               Γöé    cItem                  Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé    keyAEContainer         Γöé    typeObjectSpecifier    Γöé    (see indented record)  Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé      keyAEDesiredClass    Γöé      typeType             Γöé      cParagraph           Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé      keyAEContainer       Γöé      typeNull             Γöé      No data              Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé      keyAEKeyForm         Γöé      typeEnumerated       Γöé      formAbsolutePosition Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé      keyAEKeyData         Γöé      typeLongInteger      Γöé      3                    Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé    keyAEKeyForm           Γöé    typeType               Γöé    formAbsolutePosition   Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé    keyAEKeyData           Γöé    typeLongInteger        Γöé    1                      Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé  keyAEKeyForm             Γöé  typeEnumerated           Γöé  formRelativePosition     Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé  keyAEKeyData             Γöé  typeEnumerated           Γöé  kAEPrevious              Γöé
  ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

 If the user clicks the left edge of the first line in a paragraph, thus
 setting the insertion point before the beginning of the paragraph, you should
 use a similar strategy. However, this is the only situation in which you
 should use kAEPrevious.

 When the insertion point is at the end of a document record, use an object
 specifier record that specifies the location after the last item in the
 document.

 For example, a Select event with this direct parameter places the insertion
 point just after the last item in a document:

  ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
  ΓöéKeyword                    ΓöéDescriptor type            ΓöéData                       Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöékeyDirectObject            ΓöétypeObjectSpecifier        Γöé(see indented record)      Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé  keyAEDesiredClass        Γöé  typeType                 Γöé  cInsertionLoc            Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé  keyAEContainer           Γöé  typeObjectSpecifier      Γöé  (see indented record)    Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé    keyAEDesiredClass      Γöé    typeType               Γöé    cItem                  Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé    keyAEContainer         Γöé    typeNull               Γöé    No data                Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé    keyAEKeyForm           Γöé    typeEnumerated         Γöé    formAbsolutePosition   Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé    keyAEKeyData           Γöé    typeLongInteger        Γöé    -1                     Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé  keyAEKeyForm             Γöé  typeEnumerated           Γöé  formRelativePosition     Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé  keyAEKeyData             Γöé  typeEnumerated           Γöé  kAENext                  Γöé
  ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

 A Select event with this direct parameter places the insertion point just
 after the last item in paragraph 3:

  ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
  ΓöéKeyword                    ΓöéDescriptor type            ΓöéData                       Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöékeyDirectObject            ΓöétypeObjectSpecifier        Γöé(see indented record)      Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé  keyAEDesiredClass        Γöé  typeType                 Γöé  cInsertionLoc            Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé  keyAEContainer           Γöé  typeObjectSpecifier      Γöé  (see indented record)    Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé    keyAEDesiredClass      Γöé    typeType               Γöé    cParagraph             Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé    keyAEContainer         Γöé    typeNull               Γöé    No data                Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé    keyAEKeyForm           Γöé    typeEnumerated         Γöé    formAbsolutePosition   Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé    keyAEKeyData           Γöé    typeLongInteger        Γöé    3                      Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé  keyAEKeyForm             Γöé  typeEnumerated           Γöé  formRelativePosition     Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé  keyAEKeyData             Γöé  typeEnumerated           Γöé  kAENext                  Γöé
  ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ


ΓòÉΓòÉΓòÉ 10.3.4. Recording Typing ΓòÉΓòÉΓòÉ

In general, to record typing your application should send itself a Set Data
event that sets the contents of the selection. The data should be unstyled
text. When your application handles the Set Data event, it should apply the
styles that prevail at the insertion point. If your application supports styled
text, you need to decide how to apply styles to new text and how to record
style changes to selected text. Follow these general guidelines for recording
typing:

     When the user sets an insertion point and types new text, use the styles
      defined for the text just before the insertion location.

     When a user selects text and changes its style, apply the changes to the
      selection.

     If a user types or pastes new text into a selection, place the insertion
      point after the new text.

 The rest of this section provides examples of how to apply these guidelines.

 Suppose the user sets an insertion point and then types something. Your
 application should use the style, font, size, and other characteristics of the
 text just before the insertion point for the new text, and it should record
 only the new characters inserted. For example, to place the insertion point
 after word 30 and insert the text "This is the new text," your application can
 send a Select event followed by a Set Data event:

     A Select event with this direct parameter places the insertion point
      after word 30:

            ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
            ΓöéKeyword                    ΓöéDescriptor type            ΓöéData                       Γöé
            Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
            ΓöékeyDirectObject            ΓöétypeObjectSpecifier        Γöé(see indented record)      Γöé
            Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
            Γöé  keyAEDesiredClass        Γöé  typeType                 Γöé  cInsertionLoc            Γöé
            Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
            Γöé  keyAEContainer           Γöé  typeObjectSpecifier      Γöé  (see indented record)    Γöé
            Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
            Γöé    keyAEDesiredClass      Γöé    typeType               Γöé    cWord                  Γöé
            Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
            Γöé    keyAEContainer         Γöé    typeNull               Γöé    No data                Γöé
            Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
            Γöé    keyAEKeyForm           Γöé    typeEnumerated         Γöé    formAbsolutePosition   Γöé
            Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
            Γöé    keyAEKeyData           Γöé    typeLongInteger        Γöé    30                     Γöé
            Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
            Γöé  keyAEKeyForm             Γöé  typeEnumerated           Γöé  formRelativePosition     Γöé
            Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
            Γöé  keyAEKeyData             Γöé  typeEnumerated           Γöé  kAENext                  Γöé
            ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

     A Set Data event (event class kAECoreSuite, event ID kAESetData) with
      these parameters (keyDirectObject and keyAEData) sets the selection to
      the new text:

            ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
            ΓöéKeyword                    ΓöéDescriptor type            ΓöéData                       Γöé
            Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
            ΓöékeyDirectObject            ΓöétypeObjectSpecifier        Γöé(see indented record)      Γöé
            Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
            Γöé  keyAEDesiredClass        Γöé  typeType                 Γöé  cProperty                Γöé
            Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
            Γöé  keyAEContainer           Γöé  typeObjectSpecifier      Γöé  (see indented record)    Γöé
            Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
            Γöé    keyAEDesiredClass      Γöé    typeType               Γöé    cProperty              Γöé
            Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
            Γöé    keyAEContainer         Γöé    typeNull               Γöé    No data                Γöé
            Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
            Γöé    keyAEKeyForm           Γöé    typeEnumerated         Γöé    formPropertyID         Γöé
            Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
            Γöé    keyAEKeyData           Γöé    typeLongInteger        Γöé    pSelection             Γöé
            Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
            Γöé  keyAEKeyForm             Γöé  typeEnumerated           Γöé  formPropertyID           Γöé
            Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
            Γöé  keyAEKeyData             Γöé  typeType                 Γöé  pContents                Γöé
            Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
            ΓöékeyAEData                  ΓöétypeChar                   Γöé"This is the new text"     Γöé
            ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

      Notice that the Select event in this example causes your application to
      set its pSelection property (the current selection) to the location
      specified by the object specifier record in the direct parameter-that is,
      after word 30. The Set Data event then sets the contents of the selection
      to a text string. The pContents property specified by the object
      specifier record in the direct parameter of the Set Data event represents
      the contents of the selection, and the text string in the keyAEData
      parameter is the text to which the selection's contents is to be set.

      At this stage, the insertion point is after word 35-the last word added
      by typing. If the user now selects one of the new words, say word 34, and
      changes the style to boldface and the font to Helvetica, send a Select
      event and two Set Data events to record the action:

     A Select event with this direct parameter selects word 34:

            ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
            ΓöéKeyword                    ΓöéDescriptor type            ΓöéData                       Γöé
            Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
            ΓöékeyDirectObject            ΓöétypeObjectSpecifier        Γöé(see indented record)      Γöé
            Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
            Γöé  keyAEDesiredClass        Γöé  typeType                 Γöé  cWord                    Γöé
            Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
            Γöé  keyAEContainer           Γöé  typeNull                 Γöé  No data                  Γöé
            Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
            Γöé  keyAEKeyForm             Γöé  typeEnumerated           Γöé  formAbsolutePosition     Γöé
            Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
            Γöé  keyAEKeyData             Γöé  typeLongInteger          Γöé  34                       Γöé
            ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

     A Set Data event with these parameters sets the style of the selection to
      boldface:

            ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
            ΓöéKeyword                    ΓöéDescriptor type            ΓöéData                       Γöé
            Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
            ΓöékeyDirectObject            ΓöétypeObjectSpecifier        Γöé(see indented record)      Γöé
            Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
            Γöé  keyAEDesiredClass        Γöé  typeType                 Γöé  cProperty                Γöé
            Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
            Γöé  keyAEContainer           Γöé  typeObjectSpecifier      Γöé  (see indented record)    Γöé
            Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
            Γöé    keyAEDesiredClass      Γöé    typeType               Γöé    cProperty              Γöé
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            ΓöékeyAEData                  ΓöétypeEnumerated             ΓöékAEBold                    Γöé
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     A Set Data event with these parameters sets the font of the selection to
      Helvetica:

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            Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
            Γöé  keyAEKeyForm             Γöé  typeEnumerated           Γöé  formPropertyID           Γöé
            Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
            Γöé  keyAEKeyData             Γöé  typeType                 Γöé  pFont                    Γöé
            Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
            ΓöékeyAEData                  ΓöétypeChar                   Γöé"Helvetica"                Γöé
            ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

 After these three events are sent, word 34 remains selected. Thus, subsequent
 user actions upon the same selection do not require your application to send
 an additional event to set the selection. Your application should maintain the
 selection as long as the selected text is not replaced. If the user types or
 pastes new text into the selection, your application should place the
 insertion point after the new text.

 Such a strategy might result in a series of events like these:

     A Set Data event with these parameters sets the contents of a selection
      to "More new text":

            ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
            ΓöéKeyword                    ΓöéDescriptor type            ΓöéData                       Γöé
            Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
            ΓöékeyDirectObject            ΓöétypeObjectSpecifier        Γöé(see indented record)      Γöé
            Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
            Γöé  keyAEDesiredClass        Γöé  typeType                 Γöé  cProperty                Γöé
            Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
            Γöé  keyAEContainer           Γöé  typeObjectSpecifier      Γöé  (see indented record)    Γöé
            Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
            Γöé    keyAEDesiredClass      Γöé    typeType               Γöé    cProperty              Γöé
            Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
            Γöé    keyAEContainer         Γöé    typeNull               Γöé    No data                Γöé
            Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
            Γöé    keyAEKeyForm           Γöé    typeEnumerated         Γöé    formPropertyID         Γöé
            Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
            Γöé    keyAEKeyData           Γöé    typeLongInteger        Γöé    pSelection             Γöé
            Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
            Γöé  keyAEKeyForm             Γöé  typeEnumerated           Γöé  formPropertyID           Γöé
            Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
            Γöé  keyAEKeyData             Γöé  typeType                 Γöé  pContents                Γöé
            Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
            ΓöékeyAEData                  ΓöétypeChar                   Γöé"More new text"            Γöé
            ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

     Two Paste events paste the contents of the Clipboard twice after the new
      text.


ΓòÉΓòÉΓòÉ 10.3.5. Recording the Selection of Nontext Objects ΓòÉΓòÉΓòÉ

The selection of nontext objects differs from the selection of text objects
mainly in the way a recordable application specifies the objects. For example,
if the user is working in a table or spreadsheet and selects row 5, column 3,
your application can send a Select event with this direct parameter:

ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
ΓöéKeyword                    ΓöéDescriptor type            ΓöéData                       Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöékeyDirectObject            ΓöétypeObjectSpecifier        Γöé(see indented record)      Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé  keyAEDesiredClass        Γöé  typeType                 Γöé  cRow                     Γöé
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Γöé  keyAEContainer           Γöé  typeObjectSpecifier      Γöé  (see indented record)    Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé    keyAEDesiredClass      Γöé    typeType               Γöé    cColumn                Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé    keyAEContainer         Γöé    typeNull               Γöé    No data                Γöé
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Γöé    keyAEKeyForm           Γöé    typeEnumerated         Γöé    formAbsolutePosition   Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé    keyAEKeyData           Γöé    typeLongInteger        Γöé    3                      Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé  keyAEKeyForm             Γöé  typeEnumerated           Γöé  formAbsolutePosition     Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé  keyAEKeyData             Γöé  typeLongInteger          Γöé  5                        Γöé
ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

When recording a range of cells, use a range of rows through a range of
columns.

For example, if the user selects row 5 column 3 through row 6 column 4, specify
columns 3 through 4 of rows 5 through 6 by sending a Select event with this
direct parameter:

ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
ΓöéKeyword                    ΓöéDescriptor type            ΓöéData                        Γöé
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ΓöékeyDirectObject            ΓöétypeObjectSpecifier        Γöé(see indented record)       Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé  keyAEDesiredClass        Γöé  typeType                 Γöé  cRow                      Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé  keyAEContainer           Γöé  typeObjectSpecifier      Γöé  (see indented record)     Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé    keyAEDesiredClass      Γöé    typeType               Γöé    cColumn                 Γöé
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Γöé      keyAEKeyData         Γöé      typeLongInteger      Γöé      5                     Γöé
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Γöé      keyAEDesiredClass    Γöé      typeType             Γöé      cRow                  Γöé
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In some drawing and layout applications, users are used to dealing with
insertion points at specific locations rather than relative to other objects.
For example, setting an insertion point in a recordable drawing application
might cause the application to send itself a Select event that places the
insertion location at (235, 330)-that is, the location defined by a vertical
coordinate of 235 and a horizontal coordinate of 330. A Select event that does
this could have this direct parameter:

ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
ΓöéKeyword                    ΓöéDescriptor type            ΓöéData                       Γöé
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ΓöékeyDirectObject            ΓöétypeObjectSpecifier        Γöé(see indented record)      Γöé
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Γöé  keyAEDesiredClass        Γöé  typeType                 Γöé  cInsertionLocation       Γöé
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Γöé  keyAEContainer           Γöé  typeNull                 Γöé  No data                  Γöé
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Γöé  keyAEKeyForm             Γöé  typeEnumerated           Γöé  formAbsolutePosition     Γöé
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Γöé  keyAEKeyData             Γöé  typeAEList               Γöé  (see indented record)    Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé                           Γöé    typeLongInteger        Γöé    235                    Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
Γöé                           Γöé    typeLongInteger        Γöé    330                    Γöé
ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

Notice that the key data corresponds to an application's extension of the
standard interpretation of key form formAbsolutePosition.

To set a selection that consists of noncontiguous objects, an application
should send events that correspond to statements like these:


select {╨║
   row 5 thru 6 of column 3 thru 4, ╨║
   row 22 of column 6}

select {circle 2, rectangle 12, text frame 2}

select {file "Guidelines", file "Test Results"}


ΓòÉΓòÉΓòÉ 10.3.6. Identifying Objects ΓòÉΓòÉΓòÉ

The way a recordable application identifies objects can involve assumptions
about the user's criteria for selecting those objects. In general, such
assumptions should be avoided. Follow these guidelines for identifying objects:

     If you are not absolutely certain of the user's criteria for selecting an
      object, identify the object by name.

     If the object does not have a name, identify it by index.

     Determine the index based on the order in which a user would see the
      objects when reading a document.

     Identify windows and open documents on which actions are taken as the
      frontmost window or document.

 The rest of this section provides examples of how to apply these guidelines.

 Suppose a user is working with an electronic mail application that permits a
 variety of sorting methods for messages received. If the user is currently
 looking at messages sorted by date and then deletes the second message in the
 list, that message should be identified by name rather than by date. Use an
 object's name in any situation where it is not completely clear which
 identifying criteria the user had in mind.

 Suppose a user has used the application's Find command to locate all messages
 created on a certain date. In this case, it might be appropriate to identify
 "every message whose creation date..." in the corresponding OSA event.
 However, if the user did not ask for all messages created on that date, you
 cannot be sure whether the user really wanted every message or only a
 particular one. For instance, perhaps the user could not remember the name,
 but only an approximate date. In this case a recordable application should
 identify the message by name.

 Just as names are more specific and usually more desirable than whose tests,
 names are usually more specific and more readable than identifiers or indices.
 However, some objects may not have a name, only some other identifier or an
 index. Even though an identifier is more specific than an index, a logically
 defined index of position is more readable and is therefore recommended. For
 example, if a document contains unnamed illustrations, the user is more likely
 to identify a figure by index (order from the beginning of the file) than
 identifier (such as order created).

 Suppose a document contains two figures that appear at first glance to be side
 by side, except that the right one is slightly taller and therefore begins
 higher on the page than the left one. In cases such as this, your application
 should determine the index based on the order in which the user would see the
 objects when reading a document. For Roman script systems, this means reading
 from left to right and from top to bottom. In the example just described, the
 leftmost, shorter figure would have a lower figure number than the rightmost,
 taller one.

 When your application needs to refer to a window or a document, it should
 identify the object with an object specifier record that corresponds to the
 first, or front, window:

  ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
  ΓöéKeyword                    ΓöéDescriptor type            ΓöéData                       Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöékeyDirectObject            ΓöétypeObjectSpecifier        Γöé(see indented record)      Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé  keyAEDesiredClass        Γöé  typeType                 Γöé  cWindow                  Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé  keyAEContainer           Γöé  typeNull                 Γöé  No data                  Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé  keyAEKeyForm             Γöé  typeEnumerated           Γöé  formAbsolutePosition     Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé  keyAEKeyData             Γöé  typeLongInteger          Γöé  1                        Γöé
  ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

 This strategy allows users to record scripts that will work on any window,
 regardless of its name. Similarly, events that act on an open document should
 identify it as "document 1."

 It is usually possible to describe objects in several different ways. If an
 object has a unique name, use that. For example, instead of an object
 specifier record that describes "column number 7," use one that describes "the
 column named 'March'":

  ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
  ΓöéKeyword                    ΓöéDescriptor type            ΓöéData                       Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  ΓöékeyDirectObject            ΓöétypeObjectSpecifier        Γöé(see indented record)      Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé  keyAEDesiredClass        Γöé  typeType                 Γöé  cColumn                  Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé  keyAEContainer           Γöé  typeNull                 Γöé  No data                  Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé  keyAEKeyForm             Γöé  typeEnumerated           Γöé  formName                 Γöé
  Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
  Γöé  keyAEKeyData             Γöé  typeLongInteger          Γöé  "March"                  Γöé
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 It may be that such an object could also be described in a more complex
 manner, such as picture 1 of paragraph 302 of chapter 2. But complex
 descriptions like this should be used only as a last resort if no simpler name
 is available.

 In general, be as specific as possible when you identify a selection in a
 recordable event. The user can generalize, as necessary, by editing the
 recorded script.


ΓòÉΓòÉΓòÉ 10.3.7. Moving the Selection during Recording ΓòÉΓòÉΓòÉ

If recording is turned on and the user makes a selection, performs some action,
and then makes a different selection, your application must make a decision:
should it record the second selection in absolute terms or relative to the
first selection? That is, should the corresponding script statement be:


select insertion location before paragraph 5

or


select insertion location before paragraph after selection

Both statements may be appropriate under different conditions. But suppose that
the user had selected paragraph 3 and now selects paragraph 12 or picture 3.
Relative addressing does not make sense in these situations because the
distance involved is too great or the unit is different. When you cannot be
sure of the user's intent, you should use absolute addressing. You can safely
use relative addressing only when the user moves the selection or insertion
point by only one unit, as with the arrow keys.

Even the use of the arrow keys does not guarantee that you can use relative
addressing. For example, suppose that the user has selected cell 5 of row 2 in
a spreadsheet and then presses the Left Arrow key three times. In this case, it
is best to send OSA events equivalent to the statement


select cell 3 of row 2

rather than the statements


select the cell before selection
select the cell before selection
select the cell before selection

Using relative addressing in certain circumstances may minimize the amount of
editing that the user must do after recording a script. However, recordable
applications are not required to use relative addressing.


ΓòÉΓòÉΓòÉ 10.3.8. Recording Interactions with Dialog Boxes ΓòÉΓòÉΓòÉ

When executing scripts, users normally do not want to see dialog boxes.
Therefore, your application should record information specified by the user in
dialog boxes rather than sending events that would cause the dialog boxes to
appear during script execution.

For example, suppose a user chooses the Close command and the standard save
changes dialog box appears. If the user then clicks Save, your application
should send a Close event that corresponds to a statement like this:


close document "MyDoc" saving Yes

Any settings in a dialog box that the user does not change (such as the range
of pages to print in a Print dialog box) should not be recorded.


ΓòÉΓòÉΓòÉ 10.4. How OSA Event Recording Works ΓòÉΓòÉΓòÉ

Scripting components use the OSA Event Manager's recording mechanism to allow a
recording process such as the Script Editor application to control recording
into scripts. Script editors and applications that provide their own recording
capabilities can take advantage of the recording mechanism via standard
scripting component routines.

This section describes how scripting components use OSA event recording. You
need to read this section if you are developing a scripting component or a
script-editing application, or if you want your application to initiate and
control OSA event recording. For information about using the standard scripting
component routines to turn recording off and on, see Recording Scripts.

When a user turns on recording for a recording process (for example, by
clicking the Record button in Script Editor), the recording process calls a
scripting component routine (OSAStartRecording) to turn recording on. The
scripting component responds by sending a Start Recording event to the
recording process (or any running process on the local computer that has been
registered with the OSA Event Manager using the AEInit function).

Start Recording-begin sending copies of recordable events to recording process.

 Event class    kCoreEventClass

 Event ID       kAEStartRecording

 Parameters     None

 Description    Sent by a scripting component to the recording process (or to
                any running process on the local computer that has been
                registered with the OSA Event Manager using the AEInit
                function), but handled by the OSA Event Manager. The OSA Event
                Manager responds by turning on recording and sending a
                Recording On event to all running processes on the local
                computer that have been registered with the OSA Event Manager
                using the AEInit function.

                This event must be addressed using a process ID (PID); it
                should never be sent to an address specified as
                kCurrentProcess.

 The recording process should not handle the Start Recording event. Instead,
 the OSA Event Manager handles it by sending a Recording On event to all
 running processes on the local computer that have been registered with the OSA
 Event Manager using the AEInit function and sending copies of all subsequent
 recordable events to the recording process. (The Recording On event is
 described in section About Recordable Applications.)

 If an application that supports OSA events is launched on a computer for which
 recording is turned on, the OSA Event Manager will also send it a Recording On
 event for each recording process that is currently recording.

 The recording process receives recordable events by means of a Receive
 Recordable Event handler-that is, a handler installed in the OSA event
 dispatch table for event class kCoreEventClass and event ID
 kAENotifyRecording. Scripting components install this handler on behalf of a
 recording process when recording is first turned on and remove the handler
 when recording is turned off. Much like a handler for event class typeWildCard
 and event ID typeWildCard, the Receive Recordable Event handler handles all
 recordable events sent to the recording process by the OSA Event Manager. Any
 other OSA events received by the recording process are dispatched in the usual
 manner. The Receive Recordable Event handler handles recordable events by
 recording them in the script specified by the recording process's call to
 OSAStartRecording.

 Receive Recordable Event-receive and record a copy of a recordable event.

 Event class    kCoreEventClass

 Event ID       kAENotifyRecording

 Parameters     Same as OSA event being recorded

 Description    Wildcard event class and event ID handled by a recording
                process in order to receive and record copies of recordable
                events sent to it by the OSA Event Manager. Scripting
                components install a handler for this event on behalf of a
                recording process when recording is turned on and remove the
                handler when recording is turned off.

 Whenever the Receive Recordable Event handler receives a recordable event, the
 scripting component sends your application a Recorded Text event. The Recorded
 Text event contains the decompiled source data for the recorded event in the
 form of styled text. For a description of the Recorded Text event, see
 Recording Scripts.

 When a user turns off recording (for example, by clicking Script Editor's Stop
 button), the recording process calls a scripting component routine
 (OSAStopRecording) to turn recording off. The scripting component responds by
 sending a Stop Recording event to the recording process (or any running
 process on the local computer that has been registered with the OSA Event
 Manager using the AEInit function).

 Stop Recording-stop sending copies of recordable events to recording process

 Event class kCoreEventClass

 Event ID    kAEStopRecording

 Parameters  None

 Description Sent by a scripting component to the recording process (or to any
             running process on the local computer that has been registered
             with the OSA Event Manager using the AEInit function), but handled
             by the OSA Event Manager. The OSA Event Manager responds by
             sending a Recording Off event to all running processes on the
             local computer.

             This event must be addressed using a process ID (PID); it should
             never be sent to an address specified as kCurrentProcess.

 Like the Start Recording event, the Stop Recording event is handled by the OSA
 Event Manager. The OSA Event Manager responds by sending a Recording Off event
 to all running processes on the local computer that have been registered with
 the OSA Event Manager using the AEInit function. (The Recording Off event is
 described in section About Recordable Applications.)

 Recording continues, and the recording process may continue to receive
 recordable events, until the OSA Event Manager has notified all running
 processes that recording has been turned off for that recording process. The
 OSA Event Manager sends the Recording Off event with the kAEWaitReply flag set
 to all running processes that have been registered with the OSA Event Manager
 using the AEInit function. If an application has stored some data (for
 instance, keystrokes) that needs to be recorded as an OSA event, this is the
 last chance for the application to send the event for recording purposes.
 Recording stops only after the OSA Event Manager returns a reply for the Stop
 Recording event.

 The OSA Event Manager supports multiple simultaneous recording processes. A
 Stop Recording event sent for one of them does not affect the others. If your
 application needs to know which of several recording processes has turned
 recording on or off, it can check the keyOriginalAddressAttr attribute of the
 Recording On or Recording Off event for the address of the recording process.

 If the OSA Event Manager does not receive a Stop Recording event for a
 recording process that quits unexpectedly, the applications being recorded do
 not find out immediately. When it attempts to send a copy of a recordable
 event to a recording process that is no longer active, the OSA Event Manager
 sends a Recording Off event to all running processes that have been registered
 with the OSA Event Manager using the AEInit function on behalf of that
 recording process and specifies the address for that process in the
 keyOriginalAddressAttr attribute. If a recording process that quits is the
 only actively recording process, recording stops completely after the OSA
 Event Manager has informed all running processes that have been registered
 with the OSA Event Manager using the AEInit function that recording has been
 turned off.


ΓòÉΓòÉΓòÉ 11. Scripting Components ΓòÉΓòÉΓòÉ

This chapter describes how your application can use the Component Manager and
scripting components to manipulate and execute scripts.

Before you read this chapter, you should read Introduction to Scripting and the
chapters about the OSA Event Manager that are relevant to your application.

Your application can use the standard scripting component data structures and
routines described in this chapter to manipulate scripts written in any
scripting language based on the Open Scripting Architecture (OSA). Your
application need not be scriptable or recordable to use these routines.
However, if your application is scriptable, you can easily make it capable of
manipulating and executing scripts that control its own behavior.

The first section in this chapter describes how to establish a connection with
a scripting component. The next two sections provide:

     Examples of how to use the standard scripting component routines
     Information for developers of scripting components

 The section Scripting Components Reference describes, in addition to the
 standard scripting component routines, routines provided by the Object REXX
 component, routines provided by the generic scripting component, and routines
 called by scripting components.


ΓòÉΓòÉΓòÉ 11.1. Connecting to a Scripting Component ΓòÉΓòÉΓòÉ

To manipulate and execute scripts written in different scripting languages,
your application can use Component Manager methods either to open a connection
with each corresponding scripting component individually or to open a single
connection with the generic scripting component. The generic scripting
component, in turn, attempts to open connections dynamically with the
appropriate scripting component for each script. By opening a connection with
the generic scripting component, your application can load and execute scripts
created by any scripting component that is registered with the Component
Manager on the current computer.

In general, you should use the generic scripting component to execute and
manipulate existing scripts and a specific scripting component when you create
new scripts. When you call OSACompile or OSAStartRecording, the generic
scripting component examines the script ID to determine which scripting
component to use. If, instead of a script ID, you pass the constant
kOSANullScript to these routines, the generic scripting component uses its
current default scripting component. Each instance of the generic scripting
component has its own default scripting component. From the user's point of
view, the default scripting component corresponds to the scripting language
selected in the Script Editor application when the user first creates a new
script.

The generic scripting component provides routines you can use to get and set
the default scripting component, determine which scripting component created a
particular script, and perform other useful tasks when you are using multiple
scripting components. See the section Generic Scripting Component Routines for
descriptions of these routines.

You can use the Component Manager method OpenComponent to open a connection to
a scripting component you specify with the component identifier returned by the
FindNextComponent function. You can also use the OpenDefaultComponent function
to open a scripting component without calling the FindNextComponent function.

The OpenComponent and OpenDefaultComponent functions return a component
instance. This value identifies your application's connection to a component.
You must supply this value whenever you call a standard scripting component
method.

Note:  Your application may maintain several connections to a single component,
or it may have connections to several components at the same time. Because some
scripting components can execute only one script at a time per component
instance, a multithreaded application must provide a separate component
instance for each script that it compiles or executes while it is
simultaneously executing other scripts.

The Component Manager type code for scripting components that support the
routines described in this chapter is osa, and the subtype code for the generic
scripting component is scpt.


#define kOSAComponentType            0x2061736F  /*  "osa " */
#define kOSAGenericScriptingComponentSubtype  0x74706373  /*  "scpt" */

You can open a connection to a scripting component by calling the
OpenDefaultComponent function, which returns a component instance. For example,
this code opens a connection with the generic scripting component and stores
the returned value in an application-defined variable:


/* Get Component Manager */
ComponentManager *cmgr = newComponentManager;

/* open connection to generic scripting component */
OSAScriptingComponent *gScriptingComponent;

gScriptingComponent = cmgr->OpenDefaultComponent(ev, kOSAComponentType,
           kOSAGenericscriptingComponentSubtype);

The generic scripting component in turn opens connections with other scripting
components as necessary. The generic scripting component provides routines you
can use to get instances of other scripting components when you want to use
component-specific routines.

It is also possible to open an explicit connection directly with a specific
scripting component such as Object REXX:


/* open connection to Object REXX component*/
ComponentInstance gScriptingComponent

gScriptingComponent = cmgr->OpenDefaultComponent(ev, kOSAComponentType,
                         kObject REXXSubtype);

The scripting component routines described in this chapter include eight groups
of optional routines that scripting components can support. If necessary, you
can use the FindNextComponent function and other Component Manager routines to
find a scripting component that supports a specific group of routines or to
determine whether a particular scripting component supports a specific group of
routines.

When you call FindNextComponent, you can provide, in a component description
record (a data structure of type ComponentDescription), information about the
scripting component you wish to find. The flag bits in the componentFlags field
of a component description record provide this information. To find a scripting
component that supports a specific group of optional routines, you can specify
one or more of these constants in the componentFlags field:


#define kOSASupportsCompiling         0x0002
#define kOSASupportsGetSource         0x0004
#define kOSASupportsAECoercion        0x0008
#define kOSASupportsAESending         0x0010
#define kOSASupportsRecording         0x0020
#define kOSASupportsConvenience        0x0040
#define kOSASupportsDialects         0x0080
#define kOSASupportsEventHandling       0x0100

The routines that correspond to these constants are described in Optional
Scripting Component Routines.

Note:  Although the generic scripting component supports all the scripting
component routines represented by these flags, the support it can actually
provide depends on the individual components with which it opens connections.

The following code fragment shows how you can use these flags and the
FindNextComponent function to locate a scripting component with specific
characteristics. The componentFlags field of the component description record
passed to FindNextComponent specifies the flags kOSASupportsCompiling and
kOSASupportsGetSource. Because the componentFlagsMask field also specifies
these flags, the FindNextComponent function locates a scripting component that
supports these routines, regardless of whether or not it supports any others.
The FindNextComponent function returns a component identifier that you can then
use to get more information about the component or to open it.

OSAError MyConnectToScripting(Environment *ev, OSAScriptingComponent **sc)
{
 ComponentDescription descr, descr2;
 Component       comp;
 OSErr         myErr;
 ComponentManager   *cmgr = new ComponentManager;

  /* fill in the fields of the component description record  */
  /* first specify component type, subtype, and manufacturer */
  descr.componentType = kOSAComponentType; /* must be scripting component */
  descr.componentSubType = (OSType)0;    /* any OSA component matching spec */
  descr.componentManufacturer = (OSType)0; /* do not care about manufacturer */

  /* specify component flags and flags mask */
  descr.componentFlags = kOSASupportsCompiling || kOSASupportsGetSource;
  descr.componentFlagsMask = kOSASupportsCompiling || kOSASupportsGetSource;

  /* locate and open the specified component */
  myErr = cmgr->FindNextComponent(ev, 0, &descr, &descr2); /* 0 indicates all */
                           /* registered components */
                           /* will be searched */
  if(myErr)
   return (kComponentNotFound);

  /* check whether the found component is the generic scripting component; */
  /* if so, skip it and find the next matching component */
  if(descr2.componentSubType == kOSAGenericScriptingComponentSubtype)
   myErr = cmgr->FindNextComponent(ev, &descr2, &descr, &descr2);

  if(myErr)
   return (kComponentNotFound);
  else
  {
   *sc = (OSAScriptingComponent *) cmgr->OpenComponent(ev, &descr2);
   if(*sc == 0)
    return (kComponentNotFound);
   else
    return (noErr);

  }
}

Because the generic scripting component supports all the standard scripting
component routines, the MyConnectToScripting function in the previous code
fragment checks whether the found component is the generic scripting component
and, if so, skips it. If for any reason FindNextComponent cannot locate and
open a scripting component that supports the specified routines,
MyConnectToScripting returns the application-defined constant
kComponentNotFound.


ΓòÉΓòÉΓòÉ 11.2. Using Scripting Component Routines ΓòÉΓòÉΓòÉ

The following sections describe how to use some of the standard scripting
component routines to manipulate and execute scripts from within your
application. For an overview of these routines, see Manipulating and Executing
Scripts.

The first section describes how to compile and execute source data for a
script. The remaining sections describe how you can use scripting component
routines to:

     Get a handle to a compiled script and save the data as a resource
     Load and execute a previously saved and compiled script
     Load, modify, recompile, and save a compiled script
     Redirect OSA events to handlers in script contexts
     Supply a resume dispatch function
     Supply an alternative active function
     Supply alternative send and create functions
     Record OSA events in compiled scripts and display equivalent source data
      to the user


ΓòÉΓòÉΓòÉ 11.2.1. Compiling and Executing Source Data ΓòÉΓòÉΓòÉ

This section describes how you can use scripting component routines to obtain
source data from users, compile the source data, and execute the compiled
script. To create and execute a script using the Script Editor application, a
user can type the script, then click the Run button to execute it. Your
application can provide similar capabilities.

To allow users to write a new script and then execute it, your application must
use scripting component routines to compile and execute the source data. To
compile source data in a new script with a new script ID, pass the constant
kOSANullScript (rather than an existing script ID) in the
ppreviousAndResultingScriptID parameter of the OSACompile function. This causes
OSACompile to return a new script ID in the same parameter.

To execute a compiled script, your application must specify, in addition to the
script ID for the compiled script, a script context: either the corresponding
scripting component's default context or a script ID for the global context
created by that scripting component. Script contexts maintain state information
for the execution of scripts. Your application can use script contexts to
control the binding of variables used in scripts that it executes. For example,
if your application saves its own global context and reuses it every time a
script is executed, the binding of variables used in the script is maintained
after the user restarts the computer. If your application does not specify a
script context, the Object REXX component uses a single default context
whenever it executes the script. A scripting component's default context binds
the variables used in the script only until the user quits the application.

To specify a scripting component's default context, pass the constant
kOSANullScript in the contextID parameter of the OSAExecute function; to
specify some other global context, pass its script ID in the contextID
parameter.

The MyDoNewScript procedure in the following code fragment allows a user to
type a script in the appropriate scripting language, then compiles the script,
executes the compiled script using a global context provided by the
application, and displays the result to the user.

The MyDoNewScript procedure begins by calling the OSAScriptingComponentName
function to obtain the name of the scripting component specified by the
presultingScriptingComponentName parameter. This name is passed to the
application-defined function MyGetUserScriptText.

Note:  If you are using the generic scripting component, you can use the
OSAGetDefaultScriptingComponent function to get the subtype code for the
default scripting component (that is, the scripting component used by the
generic scripting component for new scripts). You can then get an instance of
the default scripting component by passing its subtype code to
OSAGetScriptingComponent. Finally, you can pass that instance to
OSAScriptingComponentName to obtain the default scripting component's name. For
more information about the default scripting component and routines you can use
with the generic scripting component, see Generic Scripting Component Routines.

The MyGetUserScriptText function displays the name of the scripting language to
use in a script-editing window or message box that allows the user to type and
execute a new script. After it obtains the source data for the new script, the
MyDoNewScript procedure sets the scriptID parameter to kOSANullScript. The
procedure then passes the source data and script ID to the OSACompile function.
When the script ID passed to OSACompile is kOSANullScript, OSACompile returns,
in the same parameter, a new script ID for the resulting compiled script. The
MyDoNewScript procedure then passes the new script ID to the OSAExecute
function.

In addition to a component instance and the script ID for the compiled script
to be executed, OSAExecute takes a script ID for a script context and a
parameter that contains the mode flags, if any, for script execution. In the
following code fragment, the script ID passed to OSAExecute for the script
context is gContext, a global context provided by the application. The constant
kOSAModeNull in the next parameter indicates that no mode flags are set for
script execution.

 OSAError MyDoNewScript (Environment *ev, OSAScriptingComponent *sc)
 {
  AEDesc    componentName, scriptText, resultText;
  OSAID    scriptID, resultID;
  OSAError   myOSAErr, ignoreErr;

  /* get the scripting component's name so you can show */
  /* the user which scripting language to use  */
  myOSAErr = sc->OSAScriptingComponentName(ev, componentName);
  if (myOSAErr == noErr) {
   /* get the user's script text, then compile it */
   MyGetUserScriptText(componentName, scriptText);

   /* to create a new compiled script using the user's script */
   /* text, pass kOSANullScript to OSACompile as the script ID */
   /* for the script to be compiled */
   scriptID = kOSANullScript;
   myOSAErr = sc->OSACompile(ev, &scriptText, kOSAModeNull,
              scriptID);
   ignoreErr = AEDisposeDesc(&scriptText);
  }
  if (myOSAErr == noErr) {
   /* execute the script in a global context */
   myOSAErr = sc->OSAExecute(ev, scriptID, gContext, kOSAModeNull,
                resultID);
   ignoreErr = sc->OSADispose(ev, scriptID);
   if (myOSAErr == noErr) {
     /* convert the script value returned by OSAExecute to */
     /* text that can be displayed to the user */
     myOSAErr = sc->OSADisplay(ev, resultID, typeChar, kOSAModeNull,
                  resultText);
     ignoreErr = sc->OSADispose(ev, resultID);
     /* show result to user */
     MyShowUserResult(resultText);
     ignoreErr = AEDisposeDesc(&resultText);
   }
  }
  if (myOSAErr == errOSAScriptError)
   MyGetScriptErrorInfo();
}

If script execution is successful, the MyDoNewScript procedure passes the
script ID for the resulting script value to the OSADisplay function and calls
the MyShowUserResult procedure to display the script value to the user. It also
disposes of the script data for the compiled script. If OSAExecute or
OSACompile returns the result code errOSAScriptError, the MyDoNewScript
procedure calls the MyGetScriptErrorInfo procedure shown in the following code
fragment, which uses the OSAScriptError function to obtain more information
about the error.

Whenever a scripting component routine returns the result code
errOSAScriptError, you can use OSAScriptError to obtain more information about
the error. The selector parameter of the OSAScriptError function is a constant
that specifies the kind of error information to be returned, and the
desiredType parameter is the descriptor type for the descriptor record in which
the additional error information will be returned.

The MyGetScriptErrorInfo procedure in the following code fragment calls
OSAScriptError three times: once to obtain an error number for either a system
error or a scripting component error, once to obtain a text description of the
error, and once to obtain error-range information. Finally, the
MyGetScriptErrorInfo procedure extracts the starting and ending positions of
the error range in the source data and calls the application-defined procedure
MyIndicateError to display the error information to the user. Note that your
application is responsible for disposing of any descriptor records that are
created.

You should use the OSACompile and OSAExecute functions, as shown in the
previous code fragment,, if you expect the user to execute the compiled script
several times or manipulate it in some other way. If you want to compile and
execute a script just one time and do not need to keep the compiled script in
memory after it has been executed, you can use either OSACompileExecute or
OSADoScript if these functions are supported by the scripting component you
specify.

The OSACompileExecute function takes a component instance, a descriptor record
for the source data to be compiled and executed, a context ID, and a mode flags
parameter. It executes the resulting compiled script, disposes of the compiled
script, and returns the script ID for the resulting script value.

The OSADoScript function takes a component instance, a descriptor record for
source data, a context ID, a text descriptor type, and a mode flags parameter.
It compiles and executes the script, returns a descriptor record for the text
that corresponds to the resulting script value, and disposes of both the
compiled script and the script value.

OSAError MyGetScriptErrorInfo (Environment *ev, OSAScriptingComponent *sc)
{

Handle    errorMessage;
INT      startPos, endPos;
AEDesc    desc, recordDesc;
DescType   actualType;
Size     actualSize;
Ptr      scriptErr;
OSErr     myErr, ignoreErr;
OSAError   myOSAErr;

  myOSAErr = sc->OSAScriptError(ev, kOSAErrorNumber, typeShortInteger, desc);
  myErr = AEGetDescData(&desc, &actualType, scriptErr,
             sizeof(scriptErr), &actualSize);
  ignoreErr = AEDisposeDesc(&desc);
  myOSAErr = sc->OSAScriptError(ev, kOSAErrorMessage, typeChar, desc);
  errorMessage = desc.dataHandle;
  myOSAErr = sc->OSAScriptError(ev, kOSAErrorRange, typeOSAErrorRange, desc);
  myErr = AECoerceDesc (&desc, typeAERecord, &recordDesc);
  ignoreErr = AEDisposeDesc(&desc);
  myErr = AEGetKeyPtr(&recordDesc, keySourceStart, typeShortInteger,
            &actualType, &startPos, sizeof(startPos),
            &actualSize);
  myErr = AEGetKeyPtr(&recordDesc, keySourceEnd, typeShortInteger,
            &actualType, &endPos, sizeof(endPos),
            &actualSize);
  ignoreErr = AEDisposeDesc(&recordDesc);
  MyIndicateError(scriptErr, errorMessage, startPos, endPos);
  /* add your own error checking */
}


ΓòÉΓòÉΓòÉ 11.2.2. Saving Script Data ΓòÉΓòÉΓòÉ

After creating a new script (or after modifying a previously saved script), a
user may want to save it.

Important:  Your application should usually save scripts as script data rather
than source data, so that it can reload and execute the data without compiling
it.

Before saving script data, your application can use the OSAStore function to
obtain a handle to the data. The OSAStore function takes four input parameters:
a component instance that identifies a connection with a scripting component, a
script ID for the script data to be stored, a desired descriptor type for the
descriptor record to be returned, and a parameter that contains mode flags for
use by individual scripting components. It returns a descriptor record for the
script data in the presultingScriptData parameter.

The sections that follow describe the storage formats used by OSAStore and the
resource and file types for script data.


ΓòÉΓòÉΓòÉ 11.2.2.1. Storage Formats for Script Data ΓòÉΓòÉΓòÉ

The descriptor record returned by OSAStore can be either a generic storage
descriptor record or a component-specific storage descriptor record:

     A generic storage descriptor record is a special kind of descriptor
      record of type typeOSAGenericStorage that can be used to store script
      data created by any scripting component.

     A component-specific storage descriptor record is a descriptor record
      whose descriptor type is the scripting component subtype value for the
      scripting component that created the script data.

 The following figure illustrates the logical arrangement of a generic storage
 descriptor record. The descriptor type for a generic storage descriptor record
 is always typeOSAGenericStorage, and the data referred to by the descriptor
 record's handle is always followed by a trailer containing the subtype value
 for the scripting component that created the script data.

 The following figure illustrates the logical arrangement of a
 component-specific storage descriptor record. The descriptor type for a
 component-specific storage descriptor record is the subtype value for the
 scripting component that created the script data, and the data referred to by
 the descriptor record's handle consists of the script data only, with no
 trailer.

 In most cases, it is safest to request a handle to script data in the form of
 a generic storage descriptor record, regardless of the scripting component
 subtype you pass to the OSAStore function.

 If the presence of the trailer in a generic storage descriptor record does not
 interfere with the script data, that data may be used for a wide variety of
 purposes. However, in some cases adding a trailer to script data may interfere
 with script execution. For example, suppose the data for a generic storage
 descriptor record consists of sound data. If a scripting component attempts to
 play the data from beginning to end as sound data, the trailer will interfere
 with the resulting sound. In this case, an application must open an explicit
 connection with a scripting component that can play sounds before saving the
 data, and then call OSAStore with a desired type that consists of the subtype
 for that scripting component.


ΓòÉΓòÉΓòÉ 11.2.3. Loading and Executing Script Data ΓòÉΓòÉΓòÉ

The figure section Scripting Components and Applications That Execute Scripts
illustrates how an application might execute a script whenever the user presses
the Tab key after entering a customer's name in the "Customer Name" field of an
electronic form. To execute a script in response to some user action, your
application must be able to load and execute the script data for a compiled
script.

This section describes how to load and execute a previously compiled and saved
script. The next section describes how to allow a user to modify a compiled
script.

The OSALoad function takes two input parameters: a descriptor record that
contains a handle to the script data to be loaded; and a parameter that
contains flags for use by individual scripting components. The function
returns, in the presultingScriptID parameter, a script ID for the script data.

When your application calls OSALoad with a component instance that identifies a
connection with the generic scripting component, the generic scripting
component in turn uses a connection with the scripting component that created
the script data (if that component is registered with the Component Manager on
the local computer). If the descriptor record passed to OSALoad is of type
typeOSAGenericStorage, the generic scripting component uses the trailer that
follows the script data to determine which scripting component to open a
connection with. If the descriptor record's type is the subtype value for some
other scripting component, the generic scripting component does not look for a
trailer and uses the descriptor type to identify the scripting component.

When your application calls OSALoad with a component instance that identifies a
connection to any scripting component other than the generic scripting
component, that component can load script data only if it was saved as the data
for a descriptor record whose descriptor type matches the scripting component's
subtype. In this case, however, your application easily can take advantage of
additional routines and other special capabilities provided by that scripting
component.

It is also possible to call OSALoad using the generic scripting component, then
use generic scripting component routines to identify the specific component
associated with the loaded script. This allows you to use component-specific
routines with a script originally loaded by the generic scripting component.
For information about how to do this, see Routines Used by Scripting
Components.

The OSALoad function returns a script ID for the loaded script data. The
generic scripting component always associates the returned script ID with the
scripting component that created the script. In this way, it can use a
connection with that component again whenever the client application passes the
returned script ID to other scripting component routines.

The following code fragment shows a procedure that loads and executes a script.
The MyLoadAndExecute procedure takes a handle to script data that was
previously saved using a generic storage descriptor record, obtains a script ID
for the equivalent compiled script, executes the compiled script in the default
context, and disposes of both the compiled script and the resulting script
value ID. If the OSAExecute function returns a script execution error,
MyLoadAndExecute obtains further information about the error and displays it to
the user.

OSAError MyLoadAndExecute (Environment *ev, OSAScriptingComponent *sc,
              PBYTE scriptData, ULONG size)
{
  AEDesc   scriptDesc;
  OSAID    scriptID, resultID;
  AEDesc   scriptText;
  OSAError  myOSAErr, ignoreErr;

  /*load the script data*/
  MyInitScriptDesc(&.ScriptDesc, scriptData, size);
  myOSAErr = sc->OSALoad(ev, scriptDesc, kOSAModeNull, scriptID);
  if (myOSAErr == noErr) {
   /*execute the resulting compiled script in the default */
   /* context*/
   myOSAErr = sc->OSAExecute(ev, scriptID, kOSANullScript, kOSAModeNull,
                resultID);
   ignoreErr = sc->OSADispose(ev, scriptID);
   ignoreErr = sc->OSADispose(ev, resultID);
  }
  if (myOSAErr == errOSAScriptError)
   MyGetScriptErrorInfo;
}

The OSALoad function in the previous code fragment takes a component instance,
a generic storage descriptor record for the script data to be loaded, and a
parameter that contains the mode flags, if any, for loading the script. In this
case the constant kOSAModeNull indicates that no mode flags are set. The
OSALoad function returns a script ID for the resulting compiled script, which
the MyLoadAndExecute procedure then passes to the OSAExecute formt=extonly
function.

In addition to a component instance and the script ID for the compiled script
to be executed, the OSAExecute function takes a script ID for a context and a
parameter that contains the mode flags, if any, for script execution. In the
previous code fragment, the script ID passed to OSAExecute for the script
context is kOSANullScript, indicating that the scripting component can use its
default context to bind any variables. The constant kOSAModeNull in the
modeFlags parameter indicates that no mode flags are set for script execution.

After disposing of the compiled script and the resulting script value,
MyLoadAndExecute checks the result code returned by OSAExecute. If it is
errOSAScriptError, MyLoadAndExecute calls the MyGetScriptErrorInfo procedure
(see the second code fragment in section Compiling and Executing Source Data),
which in turn uses the OSAScriptError function to obtain more information about
the error.

You can use the OSAExecute and OSAExecute functions as shown in the previous
code fragment if you expect the user to execute the compiled script several
times or manipulate it in some other way. If you want to load and execute a
script just one time and do not need to keep the compiled script in memory
after it has been executed, you can use OSALoadExecute instead of OSALoad,
OSAExecute, and OSADispose. This function takes a component instance, a
descriptor record for the script data to be loaded and executed, a context ID,
and a mode flags parameter. The OSALoadExecute function executes the resulting
compiled script, disposes of the compiled script, and returns the script ID for
the resulting script data.


ΓòÉΓòÉΓòÉ 11.2.4. Modifying and Recompiling a Compiled Script ΓòÉΓòÉΓòÉ

In addition to loading and executing a previously compiled and saved script as
described in the previous section, your application can use the scripting
component routines described in this section to decompile a compiled script,
display the equivalent source data to users for editing, and recompile the
source data after editing is completed. For example, if a user wants to change
the script shown in the figure in section Scripting Components and Applications
That Execute Scripts so that it refers to some other database or looks up other
information in addition to the customer's address, the forms application can
use scripting component routines to display the compiled script to the user and
recompile it after the user has modified it.

You can use the OSAGetSource function to obtain the source data for a compiled
script. The OSAGetSource function takes a component instance, a script ID for
the compiled script, and the desired type of the resulting descriptor record.
If you specify a component instance that identifies a connection with the
generic scripting component, you can use OSAGetSource to get the source data
for any compiled script created by a scripting component that is registered
with the Component Manager on the local computer. If you specify a component
instance that identifies an explicit connection with a scripting component, you
can use OSAGetSource only to get the source data for scripts that were compiled
by that scripting component.

The MyEditGenericScript procedure in the following code fragment shows how you
can use the OSAGetSource function with a component instance that identifies a
connection to the generic scripting component. The MyEditGenericScript function
gets the source data for a compiled script, allows the user to edit it, and
recompiles the script so the original script ID refers to the recompiled script
data.

OSAError MyEditGenericScript (Environment *ev, OSAScriptingComponent *sc,
               OSAID scriptID)
{
AEDesc    scriptText;
OSAError   myOSAErr;
OSErr     ignoreErr;

  /* first get the source data */
  myOSAErr = sc->OSAGetSource(ev, scriptID, typeChar, scriptText);

  /* call the application's primitive text editor */
  MyEditText(&scriptText);

  /*now compile the edited script data in scriptText using */
  /* the scripting component that originally created it; */
  /* passing the original script ID to OSACompile causes */
  /* OSACompile to replace the original script with the new one*/
  myOSAErr = sc->OSACompile(ev, scriptText, kOSAModeNull, scriptID);
  ignoreErr = AEDisposeDesc(&scriptText);
  if (myOSAErr == errOSAScriptError)
   MyGetScriptErrorInfo;
}

After obtaining the source data for the script, the MyEditGenericScript
procedure calls the MyEditText function, which displays the application's own
primitive text editor and allows the user to edit the source data. After the
user has finished editing the script, MyEditGenericScript passes the edited
text and the script ID for the original compiled script to the OSACompile
function, which updates the script ID so that it refers to the modified and
recompiled script. The kOSAModeNull constant passed in the modeFlags parameter
of OSACompile indicates that no mode flags are specified for compilation.

If the OSACompile function returns errOSAScriptError, the MyEditGenericScript
procedure calls the MyGetScriptErrorInfo procedure shown in the second code
fragment in section Compiling and Executing Source Data to obtain information
about the error.

After script data has changed as shown in the previous code fragment, your
application should save the modified script data. The following code fragment
shows how this could be done from a function that loads script data, calls the
MyEditGenericScript procedure shown in the previous code fragment to modify and
recompile the script, then saves the modified script data.

OSAError MyLoadAndModifyScriptData(Environment *ev, OSAScriptingComponent *gsc,
                  PBYTE scriptData, ULONG size)
{
 AEDesc  scriptDesc, storageDescRec;
 OSAID   scriptID;
 OSAError myOSAErr;
 OSErr   ignoreErr;

  AECreateDesc(typeOSAGenericStorage, scriptData, size, &scriptDesc);
  myOSAErr = gsc->OSALoad(ev, &scriptDesc, kOSAModeNull, scriptID);
  MyEditGenericScript(scriptID);
  myOSAErr = gsc->OSAStore(ev, scriptID, typeOSAGenericStorage,
               kOSAModeNull, &storageDescRec);
  MySaveScriptData(&storageDescRec);
  ignoreErr = AEDisposeDesc(&scriptDesc);
  ignoreErr = AEDisposeDesc(&storageDescRec);
}


ΓòÉΓòÉΓòÉ 11.2.5. Using a Script Context to Handle an OSA Event ΓòÉΓòÉΓòÉ

The preceding sections describe how you can load, compile, modify, and execute
scripts under circumstances determined by your application. Your application
can use these techniques to associate a script with an OSA event object or
application object and execute the script when the user manipulates the object
in some way.

Another way to execute a script is to use a script context (called a script
object in Object REXX) to handle an OSA event. To do this, your application
passes both the event and the script context to OSAExecuteEvent or OSADoEvent.
You can also associate script contexts with OSA event objects-that is, objects
in your application that can be identified by object specifier records. If an
OSA event acts on an object with which a script context is associated, your
application attempts to use the script context to handle the OSA event.

For example, the figure in section Using a Script Context to Handle an OSA
Event shows how you can use a general OSA event handler to provide initial
processing for all OSA events received by your application. the following code
fragment shows an example of such a handler.

You install a general OSA event handler like the one in the following code
fragment in your application's special handler dispatch table using the
constant keyPreDispatch:


myErr = AEInstallSpecialHandler(keyPreDispatch, &MyGeneralOSAEventHandler,
                FALSE);

When it receives an OSA event, the MyGeneralOSAEventHandler function in the
following code fragment first extracts the event's direct parameter. It then
calls another application-defined function, MyGetAttachedScript, which checks
whether the direct parameter contains an object specifier record, calls
AEResolve to locate the corresponding OSA event object, and returns a script ID
for any script context attached to that object.

If a script context is associated with the object, MyGeneralOSAEventHandler
passes the script context's script ID and the OSA event to the OSADoEvent
function. Otherwise, MyGeneralOSAEventHandler returns errAEEventNotHandled,
which causes the OSA Event Manager to look for an appropriate handler in the
application's OSA event dispatch table or elsewhere using standard OSA event
dispatching.

The OSADoEvent function in the following code fragment takes a component
instance that identifies a connection with the generic scripting component. (If
it has not already done so, the generic scripting component in turn opens a
connection with the scripting component that created the script context.) In
addition to the component instance, the OSA event, and the script ID for the
script context, OSADoEvent takes a parameter that indicates no mode flags are
set and a VAR parameter that contains any reply OSA event returned as a result
of handling the event.

If the scripting component determines that a script context cannot handle the
specified event (for example, if an Object REXX script context does not include
statements that handle the event), OSADoEvent returns errAEEventNotHandled. If
OSADoEvent attempts to use the script context to handle the event, the function
returns a reply event that contains either the resulting script value or, if an
error occurred, information about the error.

The script context shown in the figure in section Using a Script Context to
Handle an OSA Event contains an Object REXX handler for the Move event. Such
handlers exist only as Object REXX statements in a script context and do not
have corresponding entries in an application's OSA event dispatch table.
However, a handler in a script context can modify or override the actions
performed by an application's standard OSA event handlers installed in its OSA
event dispatch table.

OSErr MyGeneralOSAEventHandler (Environment *ev, OSAEvent event, OSAEvent reply,
                long refcon)
{
AEDesc    dp, resultDesc;
OSAID    scriptID;
OSErr    myErr, ignoreErr;
OSAError   myOSAErr;

  /* get the direct parameter */
  myErr = AEGetParamDesc(&event, keyDirectObject, typeWildCard, &dp);
  /*get script ID for script context attached to object */
  /* specified in direct parameter*/
  if (MyGetAttachedScript(dp, scriptID)) {
   /*execute the handler in the script context handler and, if */
   /* necessary, the default OSA event handler*/
   myOSAErr = sc->OSADoEvent(ev, event, scriptID, kOSAModeNull, reply);
  }
  myOSAErr = errAEEventNotHandled;
  ignoreErr = AEDisposeDesc(&dp);
  return ((OSErr)myOSAErr);
}


ΓòÉΓòÉΓòÉ 11.2.6. Supplying Alternative Create and Send Functions ΓòÉΓòÉΓòÉ

Every scripting component calls a create function whenever it creates an OSA
event during script execution, and a send function whenever it sends an OSA
event. Scripting components that use OSA events during script compilation,
including Object REXX, also call create and send functions during compilation.

Some scripting components may provide routines that allow your application to
set or get the pointers to the create and send functions used by that scripting
component. If your application does not set alternative send and create
functions, the scripting component uses the standard OSA Event Manager
functions AESend and AECreateOSAEvent which it calls with its own default
parameters.

A scripting component that supports the routines you can use to set or get
alternative create and send functions has the kOSASupportsAESending bit set in
its component description record. For more information about using the
Component Manager to find a scripting component that supports specific
routines, see Connecting to a Scripting Component.


ΓòÉΓòÉΓòÉ 11.2.6.1. Alternative Create Functions ΓòÉΓòÉΓòÉ

A scripting component that allows your application to set or get its create
function uses a pointer to identify the current create function.


TYPE OSAActiveProcPtr = ProcPtr;

A pointer of type AECreateOSAEventUPP points to a MyAECreateProc function that
takes the same parameters as the AECreate function plus a reference constant.


OSErr MyAECreateProc (AEEventClass theAEEventClass, AEEventID theAEEventID,
           AEAddressDesc target, int returnID, long transactionID,
           OSAEvent result, long refCon);

Your application can use an alternative create function to gain control over
the creation and addressing of OSA events. This can be useful, for example, if
your application needs to add its own transaction code to the event.

To set an alternative create function, call OSASetCreateProc; to get the
current create function, call OSAGetCreateProc. If you do not set an
alternative create function for a scripting component, it uses the standard OSA
Event Manager function AECreateOSAEvent, which it calls with its own default
parameters.

Your alternative create function can, in turn, call the scripting component's
default create function. To do this, your application can call OSAGetCreateProc
before calling OSASetCreateProc to set the alternative create function and then
call the default create function directly when necessary.


ΓòÉΓòÉΓòÉ 11.2.6.2. Alternative Send Functions ΓòÉΓòÉΓòÉ

A scripting component that allows your application to set or get its send
function uses a pointer to identify the current send function.


TYPE AESendProcPtr = ProcPtr;

A pointer of type AESendProcPtr points to a MyAESendProc function that takes
the same parameters as the AECreate function plus a reference constant.


OSErr MyAESendProc (OSAEvent theOSAEvent, OSAEvent reply, AESendMode sendMode,
          AESendPriority sendPriority, long timeOutInTicks,
          IdleProcPtr idleProc, EventFilterProcPtr filterProc,
          long refCon);

Your application can use an alternative send function to perform almost any
action instead of or in addition to sending OSA events. For example, it can
modify OSA events before sending them, save copies of OSA events before sending
them, or substitute some other specialized mechanism for sending OSA events.

To set an alternative send function, call OSASetSendProc; to get the current
send function, call OSAGetSendProc. If you do not set an alternative send
function for a scripting component, it uses the standard OSA Event Manager
function AESend, which it calls with its own default parameters.

Your alternative send function can, in turn, call the scripting component's
default send function. To do this, your application can call OSAGetSendProc
before calling OSASetSendProc to set the alternative send function and then
call the default send function directly when necessary.

After a scripting component successfully calls a send function, the scripting
component proceeds with script execution. If a call to a send function is not
successful, the scripting component returns errOSAScriptError, and a subsequent
call to OSAScriptError with kOSAErrorNumber in the selector parameter returns
errAEEventNotHandled.

Multithreaded applications need to allow other threads to execute while one
thread is waiting for the response to an OSA event. You can accomplish this by
supplying an idle function for your alternative send function that allows
threads to be switched and by setting the kAEQueueReply flag in the sendMode
parameter of the send function; however, if the call to the send function
specifies the kAENoReply flag, be careful not to override it, because the user
may have explicitly requested that no reply be returned or the aete resource
may indicate that the application cannot reply to that event.

Some scripting components can execute only one script at a time per component
instance. For this reason, a multithreaded application must provide a separate
component instance for each script that it compiles or executes while it is
also compiling or executing other scripts.

You should follow the rules for setting send mode flags described in Creating
and Sending OSA Events when you set flags for the sendMode parameter of an
alternative send function. Keep these additional guidelines in mind:

     If the target application is on the local computer, you can set the
      kAECanInteract and kAECanSwitchLayer flags.

     If the target application is on the local computer and the user has
      requested no reply, set the kAENoReply, kAECanInteract, and
      kAECanSwitchLayer flags.

     If the target application is on a remote computer, set the
      kAENeverInteract flag and do not set the kAECanSwitchLayer flag.


ΓòÉΓòÉΓòÉ 11.2.7. Recording Scripts ΓòÉΓòÉΓòÉ

If you want your application to record OSA events in the form of a compiled
script, or if you are writing a script-editing application like Script Editor,
you can use the OSAStartRecording and OSAStopRecording functions to start and
stop recording into a specified script ID on a single computer. Both functions
take a component instance and a script ID for a compiled script. When your
application calls OSAStartRecording the scripting component identified by the
component instance sends a Start Recording event to your application and
installs a Receive Recordable Event handler in your application's OSA event
dispatch table. When your application calls OSAStopRecording the scripting
component removes the handler.

An application acting as a recording process in this manner should not provide
a handler for the Start Recording event. Instead, the OSA Event Manager
receives the event and responds by sending a Recording On event to all running
processes on the local computer. Thereafter, the OSA Event Manager sends copies
of subsequent recordable events to the recording process, whose previously
installed Receive Recordable Event handler, much like a handler for event class
typeWildCard and event ID typeWildCard, handles those recordable events by
recording them in the compiled script specified in the call to
OSAStartRecording.

Whenever the Receive Recordable Event handler receives a recordable event, the
scripting component sends your application a Recorded Text event. The Recorded
Text event contains the decompiled source data for the recorded event in the
form of styled text.

Recorded Text-append styled text to script editor window.

 Event class         kOSASuite

 Event ID            kOSARecordedText

 Required parameter

   Keyword:          keyDirectObject

   Descriptor type:  typeStyledText or any other text descriptor type

   Data:             Decompiled source data for recorded event

 Description         Sent by a scripting component to a recording process for
                     each event recorded after a call to OSAStartRecording

 If your want your application to display the source data for recorded events
 as they are recorded, you must provide a handler for the Recorded Text event.

 For more information about the Receive Recordable Event handler and OSA event
 recording, see How OSA Event Recording Works.


ΓòÉΓòÉΓòÉ 11.3. Writing a Scripting Component ΓòÉΓòÉΓòÉ

It is possible to create scripting components that execute a variety of
scripts, including scripts that can be "run" in some sense but do not consist
of statements in a scripting language. For example, script data can consist of
an XCMD or even sound data that the appropriate scripting component can trigger
or play back when it executes the script (see Storage Formats for Script Data).

Every scripting component should also:

     Provide a component name in the scripting component's component resource
      that will make sense when displayed to users.

     Support the standard scripting component routines described in Required
      Scripting Component Routines.

     Support some, all, or none of the optional scripting component routines,
      as appropriate for the tasks to be performed by the scripting component.
      These routines are described in Optional Scripting Component Routines.

     Use the three OSA routines OSAGetStorageType, OSAAddStorageType, and
      OSARemoveStorageType to inspect, add, or remove the trailers appended to
      script data in generic storage descriptor records. These routines are
      described in Manipulating Trailers for Generic Storage Descriptor
      Records.

     Send the Get AETE event when necessary. This event is described in
      Handling the Get AETE Event.


ΓòÉΓòÉΓòÉ 11.4. Scripting Components Reference ΓòÉΓòÉΓòÉ

This section describes the standard scripting component data structures and
routines your application can use to manipulate and execute scripts. This
section also describes additional routines provided by the Object REXX
scripting component and three routines called by scripting components.

The first section, Data Structures, describes the principal data types used by
scripting component routines. Required Scripting Component Routines describes
the standard scripting component routines that all scripting components must
support. Optional Scripting Component Routines describes additional standard
scripting component routines that scripting components are not required to
support.

Your application can use the Component Manager to find a scripting component
that supports specific optional routines or to determine whether a particular
scripting component supports a specific group of routines. For information
about how to do this, see Connecting to a Scripting Component.

Generic Scripting Component Routines describes routines you can use to get
instances of specific components and perform other useful tasks when you are
using multiple scripting components. Routines Used by Scripting Components
describes three routines that all scripting components can use to manipulate
trailers for generic storage descriptor records.


ΓòÉΓòÉΓòÉ 11.4.1. Data Structures ΓòÉΓòÉΓòÉ

This section describes the principal data structures and Component Manager type
codes used by the standard scripting component routines. Data structures used
by individual routines are described with the appropriate routines in the
sections that follow.

The Component Manager type code for components that support the standard
scripting component routines is osa , and the subtype code for the generic
scripting component is scpt.


#define kOSAComponentType            0x2061736F  /*  "osa " */
#define kOSAGenericScriptingComponentSubtype  0x74706373  /*  "scpt" */

Because all results returned by the Component Manager are of type OSErr (a long
integer), scripting components also define this type for result codes.


typedef LONG OSErr;

Scripting components keep track of script data in memory by means of script IDs
of type OSAID.


typedef unsigned long OSAID;

A scripting component assigns a script ID when it creates the associated script
data (that is, a compiled script, a script value, a script context, or other
kinds of script data supported by a scripting component) or loads it into
memory. The scripting routines that create, load, compile, and execute scripts
all return script IDs, and your application must pass valid script IDs to the
other routines that manipulate scripts. A script ID remains valid until a
client application calls OSADispose to reclaim the memory used for the
corresponding script data.

If the execution of a script does not result in a value, OSAExecute returns the
constant kOSANullScript as the script ID. If a client application passes
kOSANullScript to the OSAGetSource function instead of a valid script ID, the
scripting component should display a null source description (possibly an empty
text string). If a client application passes kOSANullScript to
OSAStartRecording, the scripting component creates a new compiled script for
editing or recording.


#define kOSANullScript ((OSAID) 0)


ΓòÉΓòÉΓòÉ 11.4.2. Required Scripting Component Routines ΓòÉΓòÉΓòÉ

This section describes the routines that all scripting components must support.
Your application can use these routines to save and load script data, execute
and dispose of scripts, get script information, and manipulate the active
function. Optional Scripting Component Routines describes additional routines
your application can use with scripting components that support them.


ΓòÉΓòÉΓòÉ 11.4.2.1. Saving and Loading Script Data ΓòÉΓòÉΓòÉ

The OSAStore function takes a script ID and returns a copy of the corresponding
script data in the form of a storage descriptor record. You can then save the
script data as a resource or write it to the data fork of a document. The
OSALoad function takes script data in a storage descriptor record and returns a
script ID.


ΓòÉΓòÉΓòÉ 11.4.2.2. Executing and Disposing of Scripts ΓòÉΓòÉΓòÉ

To execute a script, your application must first obtain a valid script ID for a
compiled script or script context. You can use either the OSALoad function
described in the preceding section or the optional OSACompile function to
obtain a script ID.

The OSAExecute function takes a script ID for a compiled script or script
context and returns a script ID for a script value. The OSADisplay function
converts a script value to text that your application can later display to the
user. If the OSAExecute function returns errOSAScriptError, you can use the
OSAScriptError function to get more information about the error.

When your application no longer needs the script data associated with a
specific script ID, you can use the OSADispose function to release the memory
the script data occupies.


ΓòÉΓòÉΓòÉ 11.4.2.3. Setting and Getting Script Information ΓòÉΓòÉΓòÉ

The OSASetScriptInfo function sets various kinds of information about script
data, and the OSAGetScriptInfo function returns information about script data.
The kind of information these functions set or get depends on constants you
pass to the functions.


ΓòÉΓòÉΓòÉ 11.4.2.4. Manipulating the Active Function ΓòÉΓòÉΓòÉ

The OSASetActiveProc and OSAGetActiveProc functions allow your application to
set or to get a pointer to the active function called periodically by the
scripting component during script execution. To get time periodically during
script execution for its own purposes, your application can substitute its own
active function for use by the scripting component. If you do not specify an
active function, the scripting component uses its default active function,
which allows a user to cancel script execution.

The functions described in this section use the following type for pointers to
active functions:


TYPE OSAActiveProcPtr = ProcPtr;


ΓòÉΓòÉΓòÉ 11.4.3. Optional Scripting Component Routines ΓòÉΓòÉΓòÉ

This section describes eight groups of optional routines that scripting
components can support. Your application can use the Component Manager to find
a scripting component that supports a specific group of routines or to
determine whether a particular scripting component supports a specific group of
routines.

To specify one or more groups of routines for the Component Manager, use the
following constants to set the equivalent bits in the componentFlags field of a
component description record:


#define kOSASupportsCompiling         0x0002
#define kOSASupportsGetSource         0x0004
#define kOSASupportsAECoercion        0x0008
#define kOSASupportsAESending         0x0010
#define kOSASupportsRecording         0x0020
#define kOSASupportsConvenience        0x0040
#define kOSASupportsDialects         0x0080
#define kOSASupportsEventHandling       0x0100

Each of these flags identifies one of the groups of routines that are described
in the sections that follow. For information about using these constants to
locate scripting components that support specific groups of optional routines,
see Connecting to a Scripting Component.


ΓòÉΓòÉΓòÉ 11.4.3.1. Compiling Scripts ΓòÉΓòÉΓòÉ

Scripting components can provide three optional routines that get the name of a
scripting component, compile a script, and update a script ID.

To obtain the name of a scripting component in a form that you can coerce to
text, you can use the OSAScriptingComponentName function. The OSACompile
function compiles source data and returns a script ID, and the OSACopyID
function updates the script data associated with one script ID with the script
data associated with another script ID.

A scripting component that supports the routines in this section has the
kOSASupportsCompiling bit set in the componentFlags field of its component
description record.


ΓòÉΓòÉΓòÉ 11.4.3.2. Getting Source Data ΓòÉΓòÉΓòÉ

The OSAGetSource function returns the source data that corresponds to the
script data identified by a script ID. The source data it returns can, in turn,
be passed to OSACompile.

A scripting component that supports the OSAGetSource function has the
kOSASupportsGetSource bit set in the componentFlags field of its component
description record.


ΓòÉΓòÉΓòÉ 11.4.3.3. Coercing Script Values ΓòÉΓòÉΓòÉ

Scripting components can provide support for two optional routines,
OSACoerceFromDesc and OSACoerceToDesc, which coerce data in a descriptor record
to a script value and coerce a script value to data in a descriptor record,
respectively.

A scripting component that supports the routines in this section has the
kOSASupportsAECoercion bit set in the componentFlags field of its component
description record.


ΓòÉΓòÉΓòÉ 11.4.3.4. Manipulating the Create and Send Functions ΓòÉΓòÉΓòÉ

Some scripting components provide routines that allow your application to set
or get pointers to the create and send functions used by the scripting
component when it sends and creates OSA events during script execution. If you
do not set the pointers that specify these functions, the scripting component
uses the standard AECreateOSAEvent and AESend functions with default
parameters.

To gain control over the creation and addressing of OSA events, your
application can provide its own create function for use by scripting
components. To set a new create function, call the OSASetCreateProc function;
to get the current create function, call OSAGetCreateProc.

The send function provided by your application can perform almost any action
instead of or in addition to sending OSA events; for example, it can be used to
facilitate concurrent script execution. To set a new send function, call the
OSASetSendProc function; to get the current send function, call OSAGetSendProc.

The functions described in this section use the following types for pointers to
the create and send functions:


TYPE
    AESendProcPtr = ProcPtr;
    AECreateOSAEventProcPtr = ProcPtr;

For more information about create and send functions, see Supplying Alternative
Create and Send Functions.

Scripting components that support manipulation of the create and send functions
also support the OSASetDefaultTarget function, which allows you to set the
default application to which OSA event are sent.

A scripting component that supports the functions described in this section has
the kOSASupportsAESending bit set in the componentFlags field of its component
description record.


ΓòÉΓòÉΓòÉ 11.4.3.5. Recording Scripts ΓòÉΓòÉΓòÉ

The OSAStartRecording function turns on the OSA Event Manager's recording
mechanism and specifies a script in which subsequent recordable OSA events are
recorded. The scripting component sends the recording process (for example, a
script editor) a Recorded Text event that contains the decompiled equivalent
for each recordable event it receives. The script editor can then display the
decompiled script in a script editor window if a window for that script is
currently open. Recording continues until a call to OSAStopRecording turns
recording off.

Script editors use these routines to allow users to control recording. Any
application can use these routines to provide its own script-recording
interface.

For more information about the OSA event recording mechanism, see Recording OSA
Events. For more information about the Recorded Text event, see Recording
Scripts.

A scripting component that supports the functions described in this section has
the kOSASupportsRecording bit set in the componentFlags field of its component
description record.


ΓòÉΓòÉΓòÉ 11.4.3.6. Executing Scripts in One Step ΓòÉΓòÉΓòÉ

The OSALoadExecute, OSACompileExecute, OSADoScript functions combine the
capabilities of several other scripting component functions so that an
application can execute a script in a single step. You can use these functions
if you know that the script data to be executed will be executed only once.

A scripting component that supports the functions described in this section has
the kOSASupportsConvenience bit set in the componentFlags field of its
component description record.


ΓòÉΓòÉΓòÉ 11.4.3.7. Manipulating Dialects ΓòÉΓòÉΓòÉ

Scripting components that provide several dialects may provide five functions
that allow you to switch between dialects dynamically and get information about
currently available dialects. The codes for specific dialects are provided by
the scripting component.

The OSASetCreateProc function sets the current dialect, and the
OSAGetCreateProc function gets the dialect code for the current dialect. The
OSAAvailableDialectCodeList function returns a list of codes for a scripting
component's dialects. You can pass any of these codes to the OSAGetDialectInfo
function to get information about a specific dialect.

Instead of using the OSAAvailableDialectCodeList and OSAGetDialectInfo
functions, you can use the OSAAvailableDialects function to get a descriptor
list that contains information about all of the currently available dialects
for a scripting component. However, it is usually more convenient to get
information about just one dialect.

A scripting component that supports the functions described in this section has
the kOSASupportsDialects bit set in the componentFlags field of its component
description record.


ΓòÉΓòÉΓòÉ 11.4.3.8. Using Script Contexts to Handle OSA Events ΓòÉΓòÉΓòÉ

The optional routines described in this section allow your application to use
script contexts to handle OSA events. One way to do this is to install a
general OSA event handler in your application's special handler dispatch table.
The general OSA event handler provides initial handling for every OSA event
received by your application. (For an example of such a handler, see Using a
Script Context to Handle an OSA Event.)

The general OSA event handler extracts the event's direct parameter, obtains a
script ID for the script context associated with the object described in the
direct parameter, and passes the OSA event and the script ID to either
OSAExecuteEvent or OSADoEvent. The main difference between these two functions
is that OSAExecuteEvent returns a script ID for the resulting script value,
whereas OSADoEvent returns a reply OSA event that includes either the resulting
script value or information about any errors that occurred.

If the scripting component determines that a script context cannot handle the
specified event (for example, if an Object REXX script context does not include
statements that handle the event), OSAExecuteEvent and OSADoEvent return
errAEEventNotHandled. This causes the OSA Event Manager to look for an
appropriate handler in the application's OSA event dispatch table or elsewhere,
using standard OSA event dispatching. If the scripting component determines
that a script context passed to OSAExecuteEvent or OSADoEvent can handle the
event, the function attempts to use the script context for that purpose.

Script contexts can in turn pass an event to a resume dispatch function with a
statement that is equivalent to an Object REXX continue statement. The
OSASetResumeDispatchProc and OSAGetResumeDispatchProc functions allow your
application to set and get pointers to the resume dispatch function used by a
scripting component. These functions use the following type for a pointer to a
resume dispatch function:


TYPE AEHandlerProcPtr = EventHandlerProcPtr;

A resume dispatch function takes the same parameters as an OSA event handler
and dispatches an event to an application's standard handler for that event.

If you need to create a new, empty script context, you can use the
OSAMakeContext function.

A scripting component that supports the functions described in this section has
the kOSASupportsEventHandling bit set in the componentFlags field of its
component description record.


ΓòÉΓòÉΓòÉ 11.4.4. Generic Scripting Component Routines ΓòÉΓòÉΓòÉ

To manipulate and execute scripts written in different scripting languages,
your application can either open a connection with each corresponding scripting
component individually or open a single connection with the generic scripting
component. For information about how to connect with scripting components, see
Connecting to a Scripting Component.

If you open a connection with the generic scripting component, it in turn
attempts to open connections dynamically with the appropriate scripting
component for each script that it executes or manipulates. To provide this
capability, the generic scripting component must be able to determine which
scripting component created any script ID passed as a parameter to a standard
scripting component routine. Because different scripting components may end up
using the same script ID to refer to different scripts, the generic scripting
component uses its own generic script IDs. The generic scripting component
translates generic scripting IDs into the corresponding component-specific
script IDs and vice versa when necessary.

A generic script ID is a script ID of type GenericID.


TYPE GenericID = OSAID;

You do not need to know in detail how the generic scripting component keeps
track of script IDs. However, you should be aware that the script IDs to which
your application refers when it uses the generic scripting component are not
the same as the script IDs used by scripting components that s actually
manipulate and execute scripts.

If you are writing a script editor or recorder, you must pass the existing
script ID to OSACompile or OSAStartRecording when you are recompiling or
recording into an existing script. This ensures that the script is recompiled
or recorded using the same scripting component that originally created the
script. If instead you pass kOSANullScript to these routines, the new script is
compiled or recorded using the default scripting component. Each instance of
the generic scripting component has its own default scripting component. The
section Getting and Setting the Default Scripting Component which follows,
describes routines provided by the generic scripting component that allow you
to get and set the default scripting component.

The generic scripting component supports the standard scripting component
routines. However, most scripting components also support their own
component-specific routines. You cannot use the generic scripting component to
call a component-specific routine. Instead, you must use an instance of the
specific scripting component that supports the routine.

To facilitate the use of component-specific routines, the generic scripting
component allows you to identify the scripting component that created stored
script data, get an instance of a specified scripting component, and convert
between generic script IDs and component-specific script IDs. The section Using
Component-Specific Routines describes the generic scripting component routines
that allow you to perform these tasks.

Some generic scripting component routines take or return a component subtype of
type ScriptingComponentSelector.


TYPE ScriptingComponentSelector = OSType;

You can use subtype codes of this type to identify specific scripting
components.


ΓòÉΓòÉΓòÉ 11.4.4.1. Getting and Setting the Default Scripting Component ΓòÉΓòÉΓòÉ

The default scripting component for any instance of the generic scripting
component is initially Object REXX, but you can change it if necessary. The
OSAGetDefaultScriptingComponent and OSASetDefaultScriptingComponent functions
allow you to get and set the default scripting component.


ΓòÉΓòÉΓòÉ 11.4.4.2. Using Component-Specific Routines ΓòÉΓòÉΓòÉ

You cannot use the generic scripting component to call a component-specific
routine. Instead, you must use an instance of the specific scripting component
that supports the routine.

To facilitate the use of component-specific routines, the generic scripting
component allows you to identify the scripting component that created stored
script data, get an instance of a specified scripting component, and convert
between generic script IDs and component-specific script IDs.

If you want to identify the scripting component that created a storage
descriptor record but do not want to load the script, use the
OSAGetScriptingComponentFromStored function. When you need to use a specific
scripting component, the OSAGetScriptingComponent function allows you to get a
component instance for that scripting component.

The OSAGenericToRealID and OSARealToGenericID functions allow you to convert
between generic script IDs and component-specific script IDs.


ΓòÉΓòÉΓòÉ 11.4.5. Routines Used by Scripting Components ΓòÉΓòÉΓòÉ

Scripting components can call three routines to manipulate the trailers for
generic storage descriptor records. Writing a Scripting Component provides
general guidelines for writing a scripting component.


ΓòÉΓòÉΓòÉ 11.4.5.1. Manipulating Trailers for Generic Storage Descriptor Records ΓòÉΓòÉΓòÉ

All scripting components must use the OSAGetStorageType, OSAAddStorageType, and
OSARemoveStorageType functions described in this section to add, remove, and
inspect the trailers appended to script data in generic storage descriptor
records.

For more information about generic storage descriptor records, see Saving
Script Data.


ΓòÉΓòÉΓòÉ 11.4.6. Application-Defined Routines ΓòÉΓòÉΓòÉ

Your application can provide alternative active, send, and create functions for
use by scripting components during script execution. All scripting components
support routines that allow you to set and get the current active function
called periodically by the scripting component during script execution. Some
scripting components also support routines that allow you to set and get the
current send and create functions used by the scripting component when it
creates and sends OSA events during script execution.

This section provides the syntax declarations for the active, send, create, and
resume dispatch functions.


ΓòÉΓòÉΓòÉ 11.4.6.1. MyActiveProc ΓòÉΓòÉΓòÉ

Your application can provide an alternative active function that performs
periodic tasks during script compilation.

Syntax


#include <os2.h>

OSErr MyActiveProc (LongInt refCon)

Parameters

 refCon (LongInt) - input
     A reference count.

 Returns

 rc (OSErr) - returns
     Return code.

 Remarks

 Every scripting component calls an active function periodically during script
 compilation and execution and provides routines that allow your application to
 set or get the pointer to the active function. If you do not set an
 alternative active function for a scripting component, it uses its own default
 active function.


ΓòÉΓòÉΓòÉ 11.4.6.2. MyAECreateProc ΓòÉΓòÉΓòÉ

Your application can provide an alternative create function to gain control
over the creation and addressing of OSA event. This can be useful, for example,
if your application needs to add its own transaction code to the event. An
alternative create function takes the same parameters as the AECreateOSAEvent
function plus a reference constant.

Syntax


#include <os2.h>

OSErr MyAECreateProc (AEEventClass theAEEventClass, AEEventID theAEEventID,
           AEAddressDesc target, Integer returnID,
           LongInt transactionID, OSAEvent result,
           LongInt refCon)

Parameters

 theAEEventClass (AEEventClass) - input
     The event class of the OSA event to be creaed.

 theAEEventID (AEEventID) - input
     The event ID of the OSA event to be created.

 target (AEAddressDesc) - input
     The address of the server application.

 returnID (Integer) - input
     The returns ID for the OSA event or kAutoGenerateReturnID if the OSA Event
     Manager assigns a return ID that is unique to the current process.

 transactionID (LongInt) - input
     The transaction ID for the OSA event. A transaction is a sequence of OSA
     events that are sent back and forth between the client and server
     applications, beginning with the client's initial request of a service.
     All OSA events that are part of a trancaction must have the same
     transaction ID.

     This parameter can also be set to kAnyTransactionID if no transaction ID
     is being used.

 result (OSAEvent) - input
     The OSA events that are being created.

 refCon (LongInt) - input
     A reference constant.

 Returns

 rc (OSErr) - returns
     Return code.

 Remarks

 Every scripting component calls a create function whenever it creates an OSA
 event during script execution and provides routines that allow you to set or
 get the pointer to the create function. If you do not set an alternative
 create function for a scripting component, it uses the standard OSA Event
 Manager function AECreateOSAEvent, which it calls with its own default
 parameters.

 For descriptions of the scripting component routines you can use to set or get
 the pointer to a scripting component's create function, see Manipulating the
 Create and Send Functions.

 For information about create functions, see Alternative Create Functions. For
 a discussion of the parameters for the AECreateOSAEvent, function, see
 Creating an OSA Event.


ΓòÉΓòÉΓòÉ 11.4.6.3. MyAESendProc ΓòÉΓòÉΓòÉ

Your application can provide an alternative send function that performs almost
any action instead of or in addition to sending OSA event. For example, before
sending an OSA event, an alternative send function can modify the event or save
a copy of the event. An alternative send function takes the same parameters as
the AESend function plus a reference constant.

Syntax


#include <os2.h>

OSErr MyAESendProc (OSAEvent theOSAEvent, OSAEvent reply,
          AESendMode sendMode, AESendPriority sendPriority,
          LongInt timeOutInTicks, IdleProcPtr idleProc,
          EventFilterProcPtr filterProc, LongInt refCon)

Parameters

 theOSAEvent (OSAEvent) - input
     The OSA event to be sent.

 reply (OSAEvent) - input
     The reply OSA event. This parameter is returned by the AESend method when
     kAEWaitReply flag is specified in the sendMode parameter. If the
     kAEQueueReply flag is specified in the sendMode parameter and the event is
     not going to be directly dispatched, the reply OSA event is received in
     the event queue. If kAENoReply flag is specified, the reply OSA event
     returned by this function is a null-descriptor record. If kAEWaitReply is
     specified in the sendMode parameter, the application is responsible for
     using the AEDisposeDesc method to dispose of the descriptor record
     returned in the reply parameter.

 sendMode (AESendMode) - input
     A flag indicating the appropriate mode.

     These mode flags are divided into five categories. The kAEAlwaysInteract,
     kAECanInteract, and kAENeverInteract flags are used to communicate the
     user interaction preference to the server application, and only one of
     these can be set. The kAECanSwitchLayers flag is used to set the
     application switch mode. The flags kAENoReply, kAEQueueReply, and
     kAEWaitReply specify the reply mode for an OSA event, and only one of
     these can be set. The last flag, kAEWantReceipt, sets the return receipt
     mode.

     If your application is sending an event to itself, you can set the
     kAEDontRecord or the kAEDontExecute flag to prevent the event from being
     recorded or to ask the OSA Event Manager to record the event without your
     application actually receiving it.

     The server is responsible for interrogating the following flags and
     honoring the client's requirements: kAENeverInterace, kAECannotInteract,
     kAEAlwaysInterace, and kAECanSwitchLayers.

     kAEAlwaysInteract
               The server application can interact with the user in response to
               the OSA event-by convention, whenever the server application
               normally asks a user to confirm a decision or interact in any
               other way, even if no additional information is needed from the
               user.

     kAECanInteract
               The server application can interact with the user in response to
               the OSA event-by convention, if the user needs to supply
               information to the server. This flag is the default when an OSA
               event is sent to a local application.

     kAEDontExecute
               Your application is sending an OSA event to itself for recording
               purposes only-that is, you want the OSA Event Manager to send a
               copy of the event to the recording process but you do not want
               your application actually to receive the event.

     kAEDontRecord
               Your application is sending an event to itself but does not want
               the event recorded. When OSA event recording is on, the OSA
               Event Manager records a copy of every event your application
               sends to itself except for those events for which this flag is
               set.

     kAENeverInteract
               The server application should never interact with the user in
               response to the OSA event.

     kAENoReply
               Your application does not want a reply OSA event; the server
               processes your OSA event as soon as it has the opportunity. The
               OSA Event Manager returns immediately from the AESend function.

     kAEQueueReply
               Your application wants a reply OSA event; the reply appears in
               your event queue as soon as the server has the opportunity to
               process and respond to your OSA event. The OSA Event Manager
               returns immediately from the AESend function, except for direct
               dispatched events. Direct dispatched events cause the reply to
               be returned in the reply parameter of this function.

     kAEWaitReply
               Your application wants a reply OSA event and is willing to give
               up the processor while waiting for the reply; for example, if
               the server application is on the same computer as your
               application, your application yields the processor to allow the
               server to respond to your OSA event. The OSA Event Manager
               creates a new thread for the calling process and blocks on this
               thread, waiting for the server to reply.

               The process will continue to receive all messages (events) on
               its message queue.

     kAEWantReceipt
               The sender wants to receive a return receipt for this OSA event
               from the OSA Event Manager. (A return receipt means only that
               the receiving application accepted the OSA event; the OSA event
               may or may not be handled successfully after it is accepted.) If
               the receiving application does not send a returned receipt
               before the request times out, AESend returns errAETimeout as its
               function result.

 sendPriority (AESendPriority) - input
     A flag indicating the send priority. This parameter can be set to one of
     the following values:

     kAENormalPriority
               OSA event is posted at the end of the event queue.

     kAEHighPriority
               OSA event is posted at the front of the event queue.

 timeOutInTicks (LongInt) - input
     The length of time, in ticks, that the client application is willing to
     wait for the reply or return receipt from the server application before
     timing out. This parameter can also be set to one of the constants in the
     following list:

     kAEDefaultTimeout
               The OSA Event Manager provides an appropriate time-out duration.

     kAENoTimeout
               The OSA event never times out.

 idleProc (IdleProcPtr) - input
      Reserved value, must be NULL.

 filterProc (EventFilterProcPtr) - input
      Reserved value, must be NULL.

 refCon (LongInt) - input
     A reference constant.

 Returns

 rc (OSErr) - returns
     Return code.

 Remarks

 Every scripting component calls a send function whenever it sends an OSA event
 during script execution and provides routines that allow you to set or get the
 pointer to the send function. If you do not set an alternative send function
 for a scripting component, it uses the standard OSA Event Manager function
 AESend, which it calls with its own default parameters.

 For descriptions of the scripting component routines you can use to set or get
 the pointer to a scripting component's send function, see Manipulating the
 Create and Send Functions.

 For more information about send functions, see Alternative Send Functions. For
 a description of the parameters for the AESend function, see Sending OSA
 Events.


ΓòÉΓòÉΓòÉ 11.4.6.4. MyResumeDispatch ΓòÉΓòÉΓòÉ

Your application can provide a resume dispatch function that a scripting
component calls during script execution to dispatch OSA event directly to an
application's default handler for an OSA event. A resume dispatch function
takes the same parameters as an OSA event handler.

Syntax


#include <os2.h>

OSError MyResumeDispatch (OSAEvent theOSAEvent, OSAEvent reply, LongInt refCon)

Parameters

 theOSAEvent (OSAEvent) - input
     The OSA event to be dispatched.

 reply (OSAEvent) - input
     The default reply OSA eventt provided by the OSA Event Manager.

 refCon (LongInt) - input
     The reference constant stored in the OSA event dispatch table for the OSA
     event.

 Returns

 rc (OSError) - returns
     Return code.

 Remarks

 If a script specifies that the OSA event should be passed to an application's
 standard handler for that event the scripting component executing the script
 passes the event to the resume dispatch function currently being used by the
 scripting component. The resume dispatch function should dispatch the event
 directly to the application's standard handler for that event. If you use
 script contexts to handle OSA events, you may need to provide a resume
 dispatch function. If you can rely on standard OSA event dispatching to
 dispatch the event correctly, you do not need to provide a resume dispatch
 function. Instead, you can use the OSASetResumeDispatchProc routine to specify
 that the OSA Event Manager should use standard OSA event dispatching instead
 of a resume dispatch function.

 For a discussion of the use of script contexts to handle OSA events, see Using
 a Script Context to Handle an OSA Event.


ΓòÉΓòÉΓòÉ 11.5. Summary of Scripting Components ΓòÉΓòÉΓòÉ

The following table summarizes the methods related to scripting components.

ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
ΓöéFunction Name                      ΓöéDescription              Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSAAddStorageType                  ΓöéAdds a trailer to the    Γöé
Γöé                                   Γöéscript data in a generic Γöé
Γöé                                   Γöéstorage descriptor       Γöé
Γöé                                   Γöérecord.                  Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSAAvailableDialectCodeList        ΓöéObtains a descriptor listΓöé
Γöé                                   Γöécontaining dialect codes Γöé
Γöé                                   Γöéfor each of a scripting  Γöé
Γöé                                   Γöécomponent's currently    Γöé
Γöé                                   Γöéavailable dialects.      Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSAAvailableDialects               ΓöéObtains a descriptor listΓöé
Γöé                                   Γöécontaining information   Γöé
Γöé                                   Γöéabout each of the        Γöé
Γöé                                   Γöécurrently available      Γöé
Γöé                                   Γöédialects for a scripting Γöé
Γöé                                   Γöécomponent.               Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSACoerceFromDesc                  ΓöéObtains the script ID forΓöé
Γöé                                   Γöéa script value that      Γöé
Γöé                                   Γöécorresponds to the data  Γöé
Γöé                                   Γöéin a descriptor record.  Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSACoerceToDesc                    ΓöéCoerces a script value toΓöé
Γöé                                   Γöéa descriptor record of a Γöé
Γöé                                   Γöédesired descriptor type. Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSACompile                         ΓöéCompiles the source data Γöé
Γöé                                   Γöéfor a script and obtains Γöé
Γöé                                   Γöéa script ID for a        Γöé
Γöé                                   Γöécompiled script or scriptΓöé
Γöé                                   Γöécontext.                 Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSACompileExecute                  ΓöéCompiles and executes a  Γöé
Γöé                                   Γöéscript in a single step  Γöé
Γöé                                   Γöérather than calling      Γöé
Γöé                                   ΓöéOSACompile and OSAExecuteΓöé
Γöé                                   Γöéfunctions.               Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSACopyID                          ΓöéUpdates script data afterΓöé
Γöé                                   Γöéediting or recording and Γöé
Γöé                                   Γöéperforms undo or revert  Γöé
Γöé                                   Γöéoperations on script     Γöé
Γöé                                   Γöédata.                    Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSADisplay                         ΓöéConverts a script value  Γöé
Γöé                                   Γöéto text.                 Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSADispose                         ΓöéReclaims the memory      Γöé
Γöé                                   Γöéoccupied by script data. Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSADoEvent                         ΓöéHandles an OSA event withΓöé
Γöé                                   Γöéthe aid of a script      Γöé
Γöé                                   Γöécontext and obtains a    Γöé
Γöé                                   Γöéreply event.             Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSADoScript                        ΓöéHandles an OSA event withΓöé
Γöé                                   Γöéthe aid of a script      Γöé
Γöé                                   Γöécontext and obtains a    Γöé
Γöé                                   Γöéreply event.             Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSAExecute                         ΓöéExecutes a compiled      Γöé
Γöé                                   Γöéscript or a script       Γöé
Γöé                                   Γöécontext.                 Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSAExecuteEvent                    ΓöéHandles an OSA event withΓöé
Γöé                                   Γöéthe aid of a script      Γöé
Γöé                                   Γöécontext and obtains a    Γöé
Γöé                                   Γöéscript ID for the        Γöé
Γöé                                   Γöéresulting script values. Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSAGenericToRealID                 ΓöéConverts a generic scriptΓöé
Γöé                                   ΓöéID to the corresponding  Γöé
Γöé                                   Γöécomponent-specific scriptΓöé
Γöé                                   ΓöéID.                      Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSAGetActiveProc                   ΓöéObtains a pointer to the Γöé
Γöé                                   Γöéactive function that a   Γöé
Γöé                                   Γöéscripting component is   Γöé
Γöé                                   Γöécurrently using.         Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSAGetCreateProc                   ΓöéObtains a pointer to the Γöé
Γöé                                   Γöécreate function that a   Γöé
Γöé                                   Γöéscripting  component is  Γöé
Γöé                                   Γöécurrently using to createΓöé
Γöé                                   ΓöéOSA events.              Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSAGetCurrentDialect               ΓöéObtains the dialect code Γöé
Γöé                                   Γöéfor the dialect currentlyΓöé
Γöé                                   Γöébeing used by a scriptingΓöé
Γöé                                   Γöécomponent.               Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSAGetDefaultScriptingComponent    ΓöéObtains the subtype code Γöé
Γöé                                   Γöéfor the default scriptingΓöé
Γöé                                   Γöécomponent associated withΓöé
Γöé                                   Γöéan instance of the       Γöé
Γöé                                   Γöégeneric scripting        Γöé
Γöé                                   Γöécomponent.               Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSAGetDialectInfo                  ΓöéObtains information aboutΓöé
Γöé                                   Γöéa specified dialect      Γöé
Γöé                                   Γöéprovided by a specified  Γöé
Γöé                                   Γöéscripting component.     Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSAGetResumeDispatchProc           ΓöéObtains the resume       Γöé
Γöé                                   Γöédispatch function        Γöé
Γöé                                   Γöécurrently being used by aΓöé
Γöé                                   Γöéscripting component      Γöé
Γöé                                   Γöéinstance during executionΓöé
Γöé                                   Γöéof an Object REXX        Γöé
Γöé                                   Γöécontinue statement or itsΓöé
Γöé                                   Γöéequivalent.              Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSAGetScriptInfo                   ΓöéObtains information aboutΓöé
Γöé                                   Γöéscript data.             Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSAGetScriptingComponent           ΓöéObtains the instance of aΓöé
Γöé                                   Γöéscripting component for aΓöé
Γöé                                   Γöéspecified subtype.       Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSAGetScriptingComponentFromStored ΓöéObtains the subtype code Γöé
Γöé                                   Γöéfor a scripting componentΓöé
Γöé                                   Γöéthat created a storage   Γöé
Γöé                                   Γöédescriptor record.       Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSAGetSendProc                     ΓöéObtains a pointer to the Γöé
Γöé                                   Γöésend function that a     Γöé
Γöé                                   Γöéscripting component is   Γöé
Γöé                                   Γöécurrently using.         Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSAGetSource                       ΓöéDecompiles the script    Γöé
Γöé                                   Γöédata identified by a     Γöé
Γöé                                   Γöéscript ID and obtains theΓöé
Γöé                                   Γöéequivalent source data.  Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSAGetStorageType                  ΓöéRetrieves the scripting  Γöé
Γöé                                   Γöécomponent subtype from   Γöé
Γöé                                   Γöéthe script trailer       Γöé
Γöé                                   Γöéappended to the script   Γöé
Γöé                                   Γöédata in generic storage  Γöé
Γöé                                   Γöédescriptor record.       Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSALoad                            ΓöéLoads script data.       Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSALoadExecute                     ΓöéLoads script data.       Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSAMakeContext                     ΓöéObtains a script ID for aΓöé
Γöé                                   Γöénew script context.      Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSARealToGenericID                 ΓöéConverts a               Γöé
Γöé                                   Γöécomponent-specific scriptΓöé
Γöé                                   ΓöéID to the corresponding  Γöé
Γöé                                   Γöégeneric script ID.       Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSARemoveStorageType               ΓöéRemoves a trailer from   Γöé
Γöé                                   Γöéthe script data in a     Γöé
Γöé                                   Γöégeneric storage          Γöé
Γöé                                   Γöédescriptor record.       Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSAScriptError                     ΓöéReturns information aboutΓöé
Γöé                                   Γöéerrors that occur during Γöé
Γöé                                   Γöéscript execution.        Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSAScriptingComponentName          ΓöéObtains the name of a    Γöé
Γöé                                   Γöéscripting component.     Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSASetActiveProc                   ΓöéSets the active function Γöé
Γöé                                   Γöéthat a scripting         Γöé
Γöé                                   Γöécomponent calls          Γöé
Γöé                                   Γöéperiodically while       Γöé
Γöé                                   Γöéexecuting a script.      Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSASetCreateProc                   ΓöéSpecifies a create       Γöé
Γöé                                   Γöéfunction that a scriptingΓöé
Γöé                                   Γöécomponent should  use    Γöé
Γöé                                   Γöéinstead of the OSA Event Γöé
Γöé                                   ΓöéManager's                Γöé
Γöé                                   ΓöéAECreateOSAEvent functionΓöé
Γöé                                   Γöéwhen creating OSA events.Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSASetCurrentDialect               ΓöéSpecifies a create       Γöé
Γöé                                   Γöéfunction that a scriptingΓöé
Γöé                                   Γöécomponent should use     Γöé
Γöé                                   Γöéinstead of the OSA Event Γöé
Γöé                                   ΓöéManager's                Γöé
Γöé                                   ΓöéAECreateOSAEvent functionΓöé
Γöé                                   Γöéwhen creating OSA events.Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSASetDefaultScriptingComponent    ΓöéSets the default         Γöé
Γöé                                   Γöéscripting component      Γöé
Γöé                                   Γöéassociated with an       Γöé
Γöé                                   Γöéinstance of the generic  Γöé
Γöé                                   Γöéscripting component.     Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSASetDefaultTarget                ΓöéSets the default target  Γöé
Γöé                                   Γöéapplication for OSA      Γöé
Γöé                                   Γöéevents.                  Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSASetResumeDispatchProc           ΓöéSets the resume dispatch Γöé
Γöé                                   Γöéfunction called by a     Γöé
Γöé                                   Γöéscripting component      Γöé
Γöé                                   Γöéduring execution of an   Γöé
Γöé                                   ΓöéObject REXX continue     Γöé
Γöé                                   Γöéstatement or its         Γöé
Γöé                                   Γöéequivalent.              Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSASetScriptInfo                   ΓöéSets information about   Γöé
Γöé                                   Γöéscript data.             Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSASetSendProc                     ΓöéSpecifies a send functionΓöé
Γöé                                   Γöéthat a scripting         Γöé
Γöé                                   Γöécomponent should use     Γöé
Γöé                                   Γöéinstead of the OSA Event Γöé
Γöé                                   ΓöéManager's AESend functionΓöé
Γöé                                   Γöéwhen sending OSA events. Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSAStartRecording                  ΓöéTurns on OSA event       Γöé
Γöé                                   Γöérecording and records    Γöé
Γöé                                   Γöésubsequent OSA events in Γöé
Γöé                                   Γöéa compiled script.       Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSAStopRecording                   ΓöéTurns off OSA event      Γöé
Γöé                                   Γöérecording.               Γöé
Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ
ΓöéOSAStore                           ΓöéReturns a handle to the  Γöé
Γöé                                   Γöéscript data in the form  Γöé
Γöé                                   Γöéof a storage descriptor  Γöé
Γöé                                   Γöérecord.                  Γöé
ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ