-求解答jrtp create函数-解决方法

m_hWnd = hWnd;    RTPSessionParams sessParams;    double frameRate = 1.0/30.0;    sessParams.SetOwnTimestampUnit(frameRate); //30 video frames per second    sessParams.SetUsePollThread(1); //background thread to call virtual callbacks - set by default, but just to be sure    sessParams.SetMaximumPacketSize(MAX_PACKET_SIZE+12);    RTPUDPv4TransmissionParams transParams;    transParams.SetPortbase(port);    int status = Create(sessParams, &transParams);    if(status < 0)    {        //std::cerr << RTPGetErrorString(status) << std::endl;        string str = RTPGetErrorString(status);        //return  str;            }    SetDefaultPayloadType(96);    SetDefaultMark(false);    SetDefaultTimestampIncrement(10);    RTPTime delay(0.020);