Using GlobalFlags() to Test for GMEM_DISCARDABLE

ID: Q45704

The information in this article applies to:

Microsoft Windows Software Development Kit (SDK) versions 3.0, 3.1

SUMMARY

When testing for GMEM_DISCARDABLE, do not use the following:


   if(GlobalFlags(hMem) == GMEM_DISCARDABLE)

Instead, use the following:


   if(GlobalFlags(hMem) & GMEM_DISCARDABLE)

This is necessary because GlobalFlags() returns a one, i.e., 0x0100, rather than 0x0F00 if the object is discardable. It is also possible that the return value could be 0x0800 or 0x0400 or 0x0200. These cases are also taken care of with the bitwise AND.

Additional query words: 3.00 3.10

Keywords : kb16bitonly
Version : WINDOWS:3.0,3.1
Platform : WINDOWS
Issue type :