Microsoft KB Archive/99114

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Using GMEM_DDESHARE in Win32 Programming

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Q99114

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The information in this article applies to:


 * Microsoft Win32 Application Programming Interface (API), included with:
 * the operating system: Microsoft Windows NT, versions 3.1, 3.5, 3.51
 * Microsoft Windows 95

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The GMEM_DDESHARE flag remains a legitimate value for GlobalAlloc. This flag can be used to indicate that the memory will be used for one of the following so that the system can optimize the allocation for these special needs:

  DDE OLE 1.0 Clipboard operations However, GlobalAlloc( GMEM_DDESHARE, ...) cannot be used to allocate a block of memory that can be shared between processes. This flag was never intended for this purpose, even under Windows versions 3.0 and 3.1 (3.x). GlobalAlloc( GMEM_DDESHARE, ...) works in this case because all Windows- based applications share the same address space; this is not the case under Windows NT.

All allocations of global shared memory can be used within the process that they are allocated in, but another mechanism is required to share memory between processes.

Additional query words: 3.10 3.50 4.00

Keywords : kbOSWinNT310 kbOSWinNT350 kbOSWinNT351 kbOSWin95

Issue type :

Technology : kbAudDeveloper kbWin32sSearch kbWin32API