protected unsafe void EnableActionSetAVTransportURI()
        {
            iCallbackSetAVTransportURI = new CallbackSetAVTransportURI(DoSetAVTransportURI);
            IntPtr ptr = GCHandle.ToIntPtr(iGch);

            DvServiceUpnpOrgAVTransport2EnableActionSetAVTransportURI(iHandle, iCallbackSetAVTransportURI, ptr);
        }
 static extern void DvServiceUpnpOrgAVTransport2EnableActionSetAVTransportURI(uint aHandle, CallbackSetAVTransportURI aCallback, IntPtr aPtr);