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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| Yes
| Import Library
| kernel32.lib
| Header File
| winbase.h
| Unicode
| No
| Platform Notes
| None
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GlobalReAlloc
The GlobalReAlloc function changes the size or attributes of a specified global memory object.
The size can increase or decrease.
HGLOBAL GlobalReAlloc(
HGLOBAL hMem,
| // handle to the global memory object
| DWORD dwBytes,
| // new size of the block
| UINT uFlags
| // how to reallocate object
| );
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Parameters
hMem
Identifies the global memory object to be reallocated. This handle is returned
by either the GlobalAlloc or GlobalReAlloc function.
dwBytes
Specifies the new size, in bytes, of the memory block. If this parameter is
zero and the uFlags parameter specifies the GMEM_MOVEABLE flag, the function returns the handle
of a memory object that is marked as discarded. If uFlags specifies the GMEM_MODIFY flag, this parameter is ignored.
uFlags
Specifies how to reallocate the global memory object. If the GMEM_MODIFY flag
is specified, this parameter modifies the attributes of the memory object, and
the dwBytes parameter is ignored. Otherwise, this parameter controls the reallocation of
the memory object.
The GMEM_MODIFY flag can be combined with either or both of the following
flags:
Flag
| Meaning
| GMEM_DISCARDABLE
| Allocates discardable memory if the GMEM_MODIFY flag is also specified. This
flag is ignored, unless the object was previously allocated as movable or the
GMEM_MOVEABLE flag is also specified.
| GMEM_MOVEABLE
| Windows NT only: Changes a fixed memory object to a movable memory object if the GMEM_MODIFY
flag is also specified.
|
If this parameter does not specify GMEM_MODIFY, it can be any combination of
the following flags:
Flag
| Meaning
| GMEM_MOVEABLE
| If dwBytes is zero, discards a previously movable and discardable memory block. If the
lock count of the object is not zero or if the block is not movable and
discardable, the function fails.
If dwBytes is nonzero, enables the system to move the reallocated block to a new
location without changing the movable or fixed attribute of the memory object. If the
object is fixed, the handle returned may be different from the handle specified
by the hMem parameter. If the object is movable, the block can be moved without
invalidating the handle, even if the object is currently locked by a previous call to
the GlobalLock function. To get the new address of the memory block, use GlobalLock.
| GMEM_NOCOMPACT
| Prevents memory from being compacted or discarded to satisfy the allocation
request.
| GMEM_ZEROINIT
| Causes the additional memory contents to be initialized to zero if the memory
object is growing in size.
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Return Values
If the function succeeds, the return value is the handle of the reallocated
memory object.
If the function fails, the return value is NULL. To get extended error
information, call GetLastError.
Remarks
If GlobalReAlloc reallocates a movable object, the return value is the handle of the memory
object. To convert the handle to a pointer, use the GlobalLock function.
If GlobalReAlloc reallocates a fixed object, the value of the handle returned is the address
of the first byte of the memory block. To access the memory, a process can
simply cast the return value to a pointer.
If GlobalReAlloc fails, the original memory is not freed, and the original handle and pointer
are still valid.
See Also
GlobalAlloc, GlobalFree, GlobalLock
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