SetIconCacheProc
Handle theCache ; handle to icon cache theProc.
should have the following format:
This function should return either the icon data to be used to draw or nil to
signify that this entry in the icon cache does not exist. See
Drawing Icons with System 7 for more on icon caches.
This routine is not currently documented in MPW header files (hence, it is
not in any THINK C or THINK Pascal header file either). The information
given above comes from Macintosh Technical Note #306. This tech. note
also gives the inline glue for the call as follows:
= {0x303C, 0x041C, 0xABC9};