Shorthand Notation for Memory Allocation FlagsLast reviewed: July 22, 1997Article ID: Q72459 |
3.00 3.10
MS-DOS
kbprg
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SUMMARYSome flags have been defined in the WINDOWS.H file [distributed with the Windows Software Development Kit (SDK)] that are designed to be used instead of common flag combinations for memory allocations. Included below is an explanation of these flags:
Global Memory AllocationsThere are two flags defined for global memory allocation: GHND and GPTR. Both are to be used for the wFlags parameter of the GlobalAlloc function.
Flag Definition ---- ---------- GHND (GMEM_MOVEABLE | GMEM_ZEROINIT) GPTR (GMEM_FIXED | GMEM_ZEROINIT) Local Memory AllocationsSimilarly, there are two flags defined for local memory allocation: LHND and LPTR. Both are to be used for the wFlags parameter of the LocalAlloc function:
Flag Definition ---- ---------- LHND (LMEM_MOVEABLE | LMEM_ZEROINIT) LPTR (LMEM_FIXED | LMEM_ZEROINIT)The LPTR flag returns a pointer that can be used immediately (no need to call the LocalLock function); whereas with the GPTR flag, the GlobalLock function still must be used on the handle that is returned. For more information on the GlobalAlloc and LocalAlloc functions, refer to the "Microsoft Windows Software Development Kit Reference Volume 1".
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Additional reference words: 3.00 3.10
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