IMallocSpy::PreFree method (objidl.h)
Performs operations required before calling IMalloc::Free. This method ensures that the pointer passed to Free points to the beginning of the actual allocation.
Syntax
void * PreFree(
[in] void *pRequest,
[in] BOOL fSpyed
);
Parameters
[in] pRequest
A pointer to the block of memory that the caller is passing to Free.
[in] fSpyed
Indicates whether the block of memory to be freed was allocated while the current spy was active.
Return value
The value to be passed to IMalloc::Free.
Remarks
If IMallocSpy::PreAlloc modified the original allocation request passed to IMalloc::Alloc (or IMalloc::Realloc), PreFree must supply a pointer to the actual allocation, which COM will pass to IMalloc::Free. For example, if the PreAlloc/PostAlloc pair attached a header used to store debug information to the beginning of the caller's allocation, PreFree must return a pointer to the beginning of this header so that all of the block that was allocated can be freed.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 2000 Professional [desktop apps only] |
| Minimum supported server | Windows 2000 Server [desktop apps only] |
| Target Platform | Windows |
| Header | objidl.h |