PRB: FreeResource Required for Locked Resources on Macintosh (199517)


The information in this article applies to:

  • Microsoft Visual C++, Macintosh Cross-Development Addon 2.0
  • Microsoft Visual C++, Macintosh Cross-Development Addon 4.0
  • Microsoft Visual C++, Macintosh Cross-Development Addon 4.0b
This article was previously published under Q199517

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
Modification Type:MajorLast Reviewed:10/24/2003
Keywords:kbNoUpdate kbprb KB199517
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