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Celestin Apprentice 5
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Mac C Primer V2
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6.1 - MyStarter
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CStarterApp.c
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1991-08-23
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/************************************************************/
/* */
/* CStarterApp Code from Chapter Six of */
/* */
/* *** The Macintosh Programming Primer *** */
/* */
/* Copyright 1990, Dave Mark */
/* */
/* This program demonstrates specific Mac programming */
/* techniques. */
/* */
/************************************************************/
/*****
* CStarterApp.c
*
* Application methods for a typical application.
*
* Copyright © 1990 Symantec Corporation. All rights reserved.
*
*****/
#include "CStarterApp.h"
#include "CStarterDoc.h"
extern OSType gSignature;
/***
* IStarterApp
*
* Initialize the application. Your initialization method should
* at least call the inherited method. If your application class
* defines its own instance variables or global variables, this
* is a good place to initialize them.
*
***/
void CStarterApp::IStarterApp(void)
{
/*CApplication::IApplication(4, 20480L, 2048L);OLD*/
CApplication::IApplication(4, 20480L, 20480L, 20480L);
/* Altered by TCL Demo Weaver 1.0 (2/21/90) */
/* The parameters to IApplication are the number of times to call
MoreMasters, the number of bytes of heap space to reserve for
monitoring low memory situations, and the credit limit for memory
requests.
Four (4) is a reasonable number of MoreMasters calls,
but you should determine a good number for your application
by observing the heap using Lightsbug,
TMON, or Macsbug. Set this parameter to zero, give your
program a rigorous work-out, then look at the heap and count
how many master pointer blocks have been allocated. Master
pointer blocks are nonrelocatable and have a size of $100
(hex). You should call MoreMasters at least this many
times -- add a few extra just to be safe. The purpose of all
this preflighting is to prevent heap fragmentation. You
don't want the Memory Manager to call MoreMasters and
create a nonrelocatable block in the middle of your heap. By
calling MoreMasters at the very beginning of the program,
you ensure that these blocks are allocated in a group at the
bottom of the heap.
The memory reserve is a safeguard for handling low memory
conditions and is used by the GrowMemory method in
CApplication (check there for more comments). In general,
your program should never request a memory block greater
than this reserve size without explicitly checking in
advance whether there is enough free memory to satisfy the
the request.
The credit limit specifies a cut-off level for memory
requests which can tap the memory reserve. Requests larger
than this size will not use the memory reserve when the
system pleads for more memory.
*/
}
/***
* SetUpFileParameters
*
* In this routine, you specify the kinds of files your
* application opens.
*
*
***/
void CStarterApp::SetUpFileParameters(void)
{
inherited::SetUpFileParameters(); /* Be sure to call the default method */
/**
** sfNumTypes is the number of file types
** your application knows about.
** sfFileTypes[] is an array of file types.
** You can define up to 4 file types in
** sfFileTypes[].
**
**/
sfNumTypes = 1;
sfFileTypes[0] = 'TEXT';
/**
** Although it's not an instance variable,
** this method is a good place to set the
** gSignature global variable. Set this global
** to your application's signature. You'll use it
** to create a file (see CFile::CreateNew()).
**
**/
gSignature = '????';
}
/* Altered by TCL Demo Weaver 1.0 (2/21/90) */
/***
* SetUpMenus
*
* Set up menus which must be created at run time, such as a
* Font menu. You can eliminate this method if your application
* does not have any such menus.
*
***/
void CStarterApp::SetUpMenus()
{
inherited::SetUpMenus(); /* Superclass takes care of adding
menus specified in a MBAR id = 1
resource
*/
/* Add your code for creating run-time menus here */
}
/***
* DoCommand
*
* Your application will probably handle its own commands.
* Remember, the command numbers from 1-1023 are reserved.
* The file Commands.h contains all the predefined TCL
* commands.
*
* Be sure to call the default method, so you can get
* the default behvior for standard commands.
*
***/
void CStarterApp::DoCommand(long theCommand)
{
switch (theCommand) {
/* Your commands go here */
default: inherited::DoCommand(theCommand);
break;
}
}
/* Altered by TCL Demo Weaver 1.0 (2/21/90) */
/***
*
* UpdateMenus
*
* Perform menu management tasks
*
***/
void CStarterApp::UpdateMenus()
{
inherited::UpdateMenus(); /* Enable standard commands */
/* Enable the commands handled by your Application class */
}
/***
* Exit
*
* Chances are you won't need this method.
* This is the last chance your application gets to clean up
* things like temporary files before terminating.
*
***/
void CStarterApp::Exit()
{
/* your exit handler here */
}
/***
* CreateDocument
*
* The user chose New from the File menu.
* In this method, you need to create a document and send it
* a NewFile() message.
*
***/
void CStarterApp::CreateDocument()
{
CStarterDoc *theDocument;
theDocument = new(CStarterDoc);
/**
** Send your document an initialization
** message. The first argument is the
** supervisor (the application). The second
** argument is TRUE if the document is printable.
**
**/
theDocument->IStarterDoc(this, TRUE);
/**
** Send the document a NewFile() message.
** The document will open a window, and
** set up the heart of the application.
**
**/
theDocument->NewFile();
}
/***
* OpenDocument
*
* The user chose Open… from the File menu.
* In this method you need to create a document
* and send it an OpenFile() message.
*
* The macSFReply is a good SFReply record that contains
* the name and vRefNum of the file the user chose to
* open.
*
***/
void CStarterApp::OpenDocument(SFReply *macSFReply)
{
CStarterDoc *theDocument;
theDocument = new(CStarterDoc);
/**
** Send your document an initialization
** message. The first argument is the
** supervisor (the application). The second
** argument is TRUE if the document is printable.
**
**/
theDocument->IStarterDoc(this, TRUE);
/**
** Send the document an OpenFile() message.
** The document will open a window, open
** the file specified in the macSFReply record,
** and display it in its window.
**
**/
theDocument->OpenFile(macSFReply);
}