如何使用UdpClient进行通讯

应用场景

  最近一个项目因为需要跟客户的欧姆龙PLC进行通讯,客户指定了UDP方式,并且需要一直读取某个地址的值。而之前一直使用的HPSocket的绑定事件机制不是很适合这样的业务场景,因此今天花时间了解了一下System.Net.Sockets.UdpClient,重新写了一个udpclient的通讯功能。

客户端代码

     demo最终效果界面:程序【启动】后会持续的往64地址发送读取指令,比如拍照指令,移动指令等。

 关键代码

        private void ProcessThread()
        {

            while (IsStarted)
            {
                try
                {
                    sendDone.Reset();
                    client.Connect(txtIp.Text,int.Parse(txtPort.Text));
                    //800002006F00006400000101820064000001
                    string orimsgD0 = "800002006F00006400000101820064000001";
                    byte[] msgD0 = strToToHexByte(orimsgD0);
                    client.Send(msgD0, msgD0.Length);
                    client.BeginReceive(EndReceive, client);
                    sendDone.WaitOne();
                    Thread.Sleep(200);
                }
                catch (Exception ex)
                {
                    ShowInfo(ex.Message);
                    IsStarted = false;
                    continue;
                }
            }
        }
        private void EndReceive(IAsyncResult ar)
        {
            try
            {
                var s = ar.AsyncState as UdpClient;
                if (s != null)
                {
                    UdpClient udpClient = s;
                    IPEndPoint ip = null;
                    Byte[] receiveBytes = udpClient.EndReceive(ar, ref ip);
                    string msg = Encoding.UTF8.GetString(receiveBytes);
                    ShowInfo(msg);
                    ShowInfo("处理完成...你继续");                    
                    sendDone.Set();
                }
            }
            catch (Exception ex)
            {
                //处理异常
                ShowInfo(ex.Message);
            }
        }

 希望这篇文章能帮助到大家。

原文地址:https://www.cnblogs.com/liangxiarong/p/12459282.html