protected unsafe void EnableActionGetFreeFormQueryCapabilities()
        {
            iCallbackGetFreeFormQueryCapabilities = new CallbackGetFreeFormQueryCapabilities(DoGetFreeFormQueryCapabilities);
            IntPtr ptr = GCHandle.ToIntPtr(iGch);

            DvServiceUpnpOrgContentDirectory3EnableActionGetFreeFormQueryCapabilities(iHandle, iCallbackGetFreeFormQueryCapabilities, ptr);
        }
 static extern void DvServiceUpnpOrgContentDirectory3EnableActionGetFreeFormQueryCapabilities(uint aHandle, CallbackGetFreeFormQueryCapabilities aCallback, IntPtr aPtr);