    typedef struct IInternalUnknownVtbl
    {
        BEGIN_INTERFACE

        HRESULT ( STDMETHODCALLTYPE *QueryInterface )(
            IInternalUnknown * This,
            /* [in] */ REFIID riid,
            /* [iid_is][out] */ void **ppvObject);

        ULONG ( STDMETHODCALLTYPE *AddRef )(
            IInternalUnknown * This);

        ULONG ( STDMETHODCALLTYPE *Release )(
            IInternalUnknown * This);

        HRESULT ( STDMETHODCALLTYPE *QueryInternalInterface )(
            IInternalUnknown * This,
            /* [in] */ REFIID riid,
            /* [out] */ void **ppv);

        END_INTERFACE
    } IInternalUnknownVtbl;