PRB: FreeResource Required for Locked Resources on Macintosh

• Microsoft Visual C++, Macintosh Cross-Development Addon, versions 2.0, 4.0, 4.0b

SYMPTOMS

Not calling FreeResource may cause Macintosh applications to leak memory.

CAUSE

Resources on the Macintosh are fairly similar to Windows resources, but there are a few differences.

In Win32 applications, resources do not have to be locked or freed. On Macintosh platforms, however, calling LockResource does actually lock a memory block in the heap. Not calling FreeResource causes that block to remain locked.

RESOLUTION

To avoid memory leaks and heap fragmentation, FreeResource must be used on the Macintosh when a resource loaded using LoadResource is no longer needed.

REFERENCES

Macintosh Porting Guide: Resource Differences

Additional query words: FreeResource LockResource UnlockResource memory leak heap fragmentation

Keywords : kbMAC kbMFC kbVC kbDSupport MacPrgIss
Version : MACINTOSH:2.0,4.0,4.0b
Platform : MACINTOSH
Issue type : kbprb