The CoTaskMemFree function, using the default OLE allocator, frees a block of memory previously allocated through a call to the CoTaskMemAlloc or CoTaskMemRealloc function.
The number of bytes freed equals the number of bytes that were originally allocated or reallocated. After the call, the memory block pointed to by pv is invalid and can no longer be used.
Passing into this function any invalid and, under some circumstances, NULL pointers result in unexpected termination of the application.
To determine whether the platform supports this function, see Determining Supported COM APIs.