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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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LocalReAlloc
The LocalReAlloc function changes the size or the attributes of a specified local memory
object. The size can increase or decrease.
HLOCAL LocalReAlloc(
HLOCAL hMem,
| // handle of local memory object
| UINT uBytes,
| // new size of block
| UINT uFlags
| // how to reallocate object
| );
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Parameters
hMem
Identifies the local memory object to be reallocated. This handle is returned
by either the LocalAlloc or LocalReAlloc function.
uBytes
Specifies the new size, in bytes, of the memory block. If this parameter is
zero and the uFlags parameter specifies the LMEM_MOVEABLE flag, the function returns a handle to
a memory object that is marked as discarded. If uFlags specifies the LMEM_MODIFY flag, this parameter is ignored.
uFlags
Specifies how to reallocate the local memory object. If the LMEM_MODIFY flag
is specified, this parameter modifies the attributes of the memory object, and
the uBytes parameter is ignored. Otherwise, this parameter controls the reallocation of
the memory object.
The LMEM_MODIFY flag can be combined with either or both of the following
flags:
| Allocates discardable memory if the LMEM_MODIFY flag is also specified. This
flag is ignored, unless the object was previously allocated as movable or the
LMEM_MOVEABLE flag is also specified.
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| You cannot combine LMEM_MOVEABLE with LMEM_MODIFY to change a fixed memory
object into a movable one. The function returns an error if an application
attempts this.
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If uFlags does not specify LMEM_MODIFY, this parameter can be any combination of the
following flags:
| If uBytes is zero, discards a previously movable and discardable memory block. If the
object's lock count is not zero or the block is not movable and discardable, the
function fails.
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| If uBytes 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
in 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 LocalLock function. To get the new address of the memory block, use LocalLock.
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| Prevents memory from being compacted or discarded to satisfy the allocation
request.
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| 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 LocalReAlloc reallocates a movable object, the return value is the handle of the memory
object. To convert the handle to a pointer, use the LocalLock function.
If LocalReAlloc 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.
See Also
LocalAlloc, LocalFree, LocalLock
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