Memory Freeing Problem

[Siddhartha]

IStream *pStream;

Please don't use raw interface pointers.

This is better written as -

CComQIPtr <IStream> pStream;

...You will not have to worry about reference counting - the smart pointer will release for you when it goes out of scope.

::CreateStreamOnHGlobal(NULL,TRUE,&pStream);

Check return values for success.

the memory is keep increase after each call and nothing is freed,

Where did you see this memory "increase"?

pStream->Release();

If you use the smart pointer, you comment this line out.

I also tried to use GlobalFree(pStream), and GlobalFree(&pStream) with no avail. memory keep rasing after each call

Naturally to no avail. GlobalFree accepts a HGLOBAL and not an interface pointer. You are lucky worse things didn't happen.

Anyways, you don't need to do this.

Reason:

CreateStreamOnHGlobal -

If the caller sets the fDeleteOnRelease parameter to FALSE, then the caller must also free the hGlobal after the final release. If the caller sets the fDeleteOnRelease parameter to TRUE, the final release will automatically free the hGlobal as shown in the following code excerpt.