新手求助关于UDP异步通信接收的问题

liuyemeixin1 2016-12-20 11:16:20

主要功能是上位机管理设备通信,上位机一台,连接网口转串口设备,类似于交换机性质,设备通过串口连接到交换机,上位机通过网口连接控制,交换机上每个串口都会分配一个IP地址.设备最多可能到100台左右.
同步通信点对点已调试接收好,但考虑到设备数量多,UDP同步接收可能会造成通信阻塞,于是打算采用异步收发.
问题有2,
1.查询设备状态,由上位机进行广播,由于设备限制,设备收到查询信息后就直接反馈当前设备状态到主机,这样主机通信会不会阻塞?
2.异步发送调试通过,但接收始终接收不到数据.代码如下:

 

        public frmMain mainForm;

        private static Thread ClientRecThread;

        bool bReceiving = false;

        private UdpClient recvUdpClient=null;

        private UdpClient sendUdpClient=null;

        IPEndPoint remoteIPE = null;

        IPEndPoint localIPE = null;

        private ManualResetEvent sendDone = new ManualResetEvent(false);

        private ManualResetEvent recvDone = new ManualResetEvent(false);

        UdpState udpRecvState = null;

        UdpState udpSendState = null;

        public UdpClientClass(string strLocalIp,  int nLocalPort,string strTargetIp,int nTargetPort,string strNetMask,string strGateWay)

        {                  

            localIPE = new IPEndPoint(IPAddress.Any, nLocalPort);

            remoteIPE = new IPEndPoint(IPAddress.Parse(strTargetIp), nTargetPort);



            recvUdpClient = new UdpClient(localIPE);

            sendUdpClient = new UdpClient();



            udpRecvState = new UdpState();            

            udpRecvState.ipEndPoint = localIPE;

            udpRecvState.udpclient = recvUdpClient;



            udpSendState = new UdpState();            

            udpSendState.ipEndPoint = remoteIPE;

            sendUdpClient.Connect(udpSendState.ipEndPoint);

            udpSendState.udpclient = sendUdpClient;            

            StartLisnProc();

        }



     private void StartLisnProc()

        {

            bReceiving = true;

            ClientRecThread = new Thread(new ThreadStart(RecvData));

            ClientRecThread.IsBackground = true;

            ClientRecThread.Start();

        }

        private void RecvData()

        {

            while(bReceiving)

            {

                lock (this)

                {

                    IAsyncResult iar = recvUdpClient.BeginReceive(new AsyncCallback(asycRecvCallback), udpRecvState);

                    recvDone.WaitOne();

                }

            }

        }

     private void asycRecvCallback(IAsyncResult iar)

        {

            UdpState udpState = iar.AsyncState as UdpState;

            if (iar.IsCompleted)

            {

                byte[] recvBytes = udpState.udpclient.EndReceive(iar, ref udpRecvState.ipEndPoint);

                string strRecv = ByteToString(recvBytes);

                if (recvBytes.Length > 0)

                {

                    mainForm.UpdateState(strRecv, recvBytes.Length);

                }

                recvDone.Set();

            }

        }

IAsyncResult iar = recvUdpClient.BeginReceive(new AsyncCallback(asycRecvCallback), udpRecvState);
程序运行到这里后等待信号,数据到来之后始终跳转不到回调函数里.如果把recvUdpClient换为sendUdpClient就可以跳转到回调函数里,这样就接收不到其他设备的数据.请问大神问题出在什么地方啊?急

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