COM: CoMarshalInterface problem.

9 Nov 2006 22:51:02 -0800

I have server side application with the method AddClient( IUnknown*
pUnkClient ).
The client is simple comobject.
When inside function AddClient I call pair:
CoMarshalInterface/CoUnmarshalInterface - count of references increases
in 3. Later client comobject become destroyed only when CoUninitialize
is called in the server. If in function AddClient I call pair:
CoMarshalInterThreadInterfaceInStream/CoGetInterfaceAndReleaseStream -
everything work ok.

I can't understand why this behaviour occurs.
Please, review Method1 in function AddClient and let me know, where am

My function AddClient. There are 2 methods inside:
HRESULT AddClient( IUnknown* pUnkClient )
// Method 1 -- increase client counter in 3; client object is destroyed

in CoUninialize of the server
        CComPtr<IStream> pMStream1;
        HRESULT hr = CreateStreamOnHGlobal(NULL, TRUE, &pMStream1);
        CComPtr<IUnknown> spOutUnk1;
        hr = CoMarshalInterface(pMStream1, IID_IUnknown, pUnkClient,
                IID_IUnknown, (void**)&spOutUnk1 );

// Method 2 - client counter keep it's counter value.
        CComPtr<IStream> pMStream2;
        CComPtr<IDispatch> spOutUnk2;
                pUnkClient, &pMStream2);
        CoGetInterfaceAndReleaseStream( pMStream2.Detach(),
                IID_IUnknown, (void**)&spOutUnk1 );

Thanks a lot for any help!

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