IMallocSpy

The IMallocSpy interface is a debugging interface that allows application developers to monitor (spy on) memory allocation, detect memory leaks and simulate memory failure.

Caution The IMallocSpy interface is intended to be used only to debug application code under development. Do not ship this interface to retail customers of your application, because it causes severe performance degradation and could conflict with user-installed software to produce unpredictable results.

When to Implement

Implement this interface to debug memory allocation during application development.

When to Use

IMallocSpy methods are called only by OLE; applications do not call them. An application provides an implementation of IMallocSpy (see the OLE SDK for an example); OLE uses this implementation. When an implementation of IMallocSpy is registered with CoRegisterMallocSpy, OLE calls the pair of IMallocSpy methods around the corresponding IMalloc method. The call to the pre-method through the return from the corresponding post-method is guaranteed to be thread-safe.

Methods in Vtable Order

IUnknown Methods	Description
QueryInterface	Returns pointers to supported interfaces.
AddRef	Increments reference count.
Release	Decrements reference count.

IMallocSpy Methods	Description
PreAlloc	Called before invoking IMalloc::Alloc.
PostAlloc	Called after invoking IMalloc::Alloc.
PreFree	Called before invoking IMalloc::Free.
PostFree	Called after invoking IMalloc::Free.
PreRealloc	Called before invoking IMalloc::Realloc.
PostRealloc	Called after invoking IMalloc::Realloc.
PreGetSize	Called before invoking IMalloc::GetSize.
PostGetSize	Called after invoking IMalloc::GetSize.
PreDidAlloc	Called before invoking IMalloc::DidAlloc.
PostDidAlloc	Called after invoking IMalloc::DidAlloc.
PreHeapMinimize	Called before invoking IMalloc::DidAlloc.
PostHeapMinimize	Called after invoking IMalloc::HeapMinimize.

See Also

IMalloc, CoGetMalloc, CoRegisterMallocSpy

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