IMallocSpy::PreGetSize
Called just prior to invoking
IMalloc::GetSize.
PreGetSize(
void * pRequest,
| //Pointer the caller is passing to IMalloc::GetSize
|
BOOL fSpyed
| //TRUE if allocation done while this spy was active
|
);
|
|
Parameters
pRequest
The pointer the caller is passing to
IMalloc::GetSize
fSpyed
TRUE if the allocation was done while the spy was active.
Return Value
Pointer to the actual allocation for which the size is to be determined.
Comments
The
PreGetSize method receives as its
pRequest parameter the pointer the caller is passing to
IMalloc::GetSize. It must then return a pointer to the actual allocation, which is then passed
to
PostGetSize as the
pRequest parameter.
The size determined by
IMalloc::GetSize is then passed to
IMallocSpy::PostGetSize as
cbActual.
Note The size determined by
IMalloc::GetSize is the value returned by the Win32 API
HeapSize. On Windows NT, this is the size originally requested. On Windows95, memory
allocations are done on eight-byte boundaries. For example, a memory allocation
request of 27 bytes on Windows NT would return an allocation of 32 bytes and
GetSize would return 27. On Windows95, the same request would return an allocation of
28 bytes and
GetSize would return 28. Implementors of
IMallocSpy::PostGetSize cannot assume, for example, that if
cbActual is sizeof(debug_header), that the value is the actual size of the user's
allocation.
See Also
IMalloc::GetSize,
IMallocSpy::PostGetSize,
CoRegisterMallocSpy,
CoRevokeMallocSpy
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