IMallocSpy ZDU_T4

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

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

When an implementation of IMallocSpy is registered with CoRegisterMallocSpySX_AGF, OLE calls the pair of IMallocSpy methods around the corresponding IMallocOCJ0KK method. You would not make direct calls to IMallocSpy methods. The OLE SDK contains a sample implementation of IMallocSpy. The call to the pre-method through the return from the corresponding post-method is guaranteed to be thread-safe in multi-threaded operations.

Methods in Vtable Order

IUnknown1NEM0LU Methods	Description
QueryInterface2Y54585	Returns pointers to supported interfaces.
AddRef1SHW0SS	Increments reference count.
ReleaseDUW01A	Decrements reference count.

IMallocSpy Methods	Description
PreAllocIOU.4F	Called before invoking IMalloc::Alloc1THWWZM, and may extend or modify the allocation to store debug information.
PostAllocU43KGH	Called after invoking IMalloc::Alloc.
PreFree135_MA.	Called before invoking IMalloc::Free62NW.NT.
PostFree4250_PW	Called after invoking IMalloc::Free.
PreRealloc2JYZ0VE	Called before invoking IMalloc::Realloc5HRJV..
PostRealloc.G4YCT	Called after invoking IMalloc::Realloc.
PreGetSize16C21PP	Called before invoking IMalloc::GetSize65AX.OK.
PostGetSize7BOOAT	Called after invoking IMalloc::GetSize.
PreDidAlloc1F9V9XU	Called before invoking IMalloc::DidAlloc4NPHFW.
PostDidAllocY3I08H	Called after invoking IMalloc::DidAlloc.
PreHeapMinimizeAHAS5P	Called before invoking IMalloc::DidAlloc4NPHFW.
PostHeapMinimizeK52SM1	Called after invoking IMalloc::HeapMinimize329F535.