protected unsafe void EnableActionGetMediaInfo()
        {
            iCallbackGetMediaInfo = new CallbackGetMediaInfo(DoGetMediaInfo);
            IntPtr ptr = GCHandle.ToIntPtr(iGch);

            DvServiceUpnpOrgAVTransport2EnableActionGetMediaInfo(iHandle, iCallbackGetMediaInfo, ptr);
        }
 static extern void DvServiceUpnpOrgAVTransport2EnableActionGetMediaInfo(uint aHandle, CallbackGetMediaInfo aCallback, IntPtr aPtr);