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- Apple II
- File Type Notes
- _____________________________________________________________________________
- Developer Technical Support
-
-
- File Type: $CA (202)
- Auxiliary Type: Reserved
-
- Full Name: Finder Icons File
- Short Name: Icons
-
- Written by: Matt Deatherage July 1989
-
- Files of this type and auxiliary type contain icons.
- _____________________________________________________________________________
-
- The Apple IIGS Finder keeps the icons it uses in files of type $CA. The
- Finder searches for these files in a directory named Icons on each volume
- mounted. Each icon contains information not only describing the icon and its
- mask (both regular and "small icon" sizes), but also information to match the
- icon to files from their file type, auxiliary type, and filename.
-
- The Finder first attempts to load the file Finder.Icons from the Icons
- directory on the boot disk, stopping with a fatal error if it is not present
- (this file contains icons for devices as well as the icon to match files with
- no other icon). It then loads other icon files from that directory, and then
- from other disks.
-
- The format of icon files is as follows:
-
- +000 iBlkNext Long When loaded by the Finder, this is the
- handle to the next icon file (a linked
- list terminated by zero). On disk, this
- field should be zero.
- +004 iBlkID Word ID number of this type of icon file. This
- field must be $0001 for the Finder to
- recognize the icon file.
- +006 iBlkPath Long When loaded by the Finder, this is the
- handle to the pathname of this icon file.
- On disk, this field should be zero.
- +010 iBlkName 16 Bytes A 16-byte String of the name of the icon
- file.
- +026 iBlkIcons IconData A list of Icon Data records.
-
- The format of Icon Data records is as follows:
-
- +000 iDataLen Word The length of this Icon Data record. A
- value of zero in this field terminates the
- list of Icon Data records.
- +002 iDataBoss 64 Bytes The pathname of the
- application that owns this icon. If this
- String has non-zero length, and the file
- this icon is associated with is a document
- (not an application, folder, device, or
- trash can), the Finder attempts to launch
- a file with this pathname when this icon
- is opened or printed. This string should
- be empty for non-documents. This is a
- full pathname, and most developers
- creating icons will wish to set this to
- the full pathname of the application on
- the shipping disk.
- +066 iDataName 16 Bytes A 16-byte String containing a
- file name. Files on disk must match the
- specification of this string or this icon
- will not be displayed for the files. The
- asterisk (*) serves as a wildcard
- character. For example, the string *.ASM
- matches all filenames ending with the
- characters .ASM.
- +082 iDatatype Word File type associated with this icon.
- Files on disk must have this file type for
- this icon to be displayed. A file type of
- $0000 in this field matches any file type
- on disk. As an example, an application
- icon would want to have the filename of
- the application in the iDataName field and
- the file type $00B3 (GS/OS Application) in
- this field. Without the file type
- specification, the icon would show up for
- any file with the application's file name,
- including a folder on a hard disk in which
- the user has placed the application.
- +084 iDataAux Word Auxiliary type associated with this icon.
- Similar to the file type field, a value of
- $0000 here matches any auxiliary type on
- disk.
- +086 iDataBig Icon The normal size icon image data.
- iDataSmall Icon The small size icon image data.
-
- The format of Icon records is the same as that listed in the QuickDraw II
- Auxiliary chapter of the Apple IIGS Toolbox Reference Manual. Previous icon
- structure documentation stated the iconType field of the Icon record (also
- known as the imType field) had to be zero. This is no longer true; the Finder
- respects color icons (bit 15 of iconType set) by not coloring the icon in
- funny ways, even if the user asks for it. The Finder still does this if bit
- 15 of iconType says the icon is a black-and-white icon.
-
-
- Further Reference
- _____________________________________________________________________________
- o Apple IIGS Toolbox Reference, Volume 2
- o Apple IIGS Icon Editor