C# WPF上位机实现和下位机TCP通讯

释放双眼,带上耳机,听听看~!

下位机使用北京大华程控电源DH1766-1,上位机使用WPF。实现了电压电流实时采集,曲线显示。上午在公司调试成功,手头没有程控电源,使用TCP服务端模拟。昨天写的TCP服务端正好排上用场。

界面如下:

服务端

服务端实在上篇基础上实现的。需要做如下更改:

while (true)

                          {

                              try

                              {

                                  byte[] bufferDate = new byte[1024];

                                  int realLen = pSocket.Receive(bufferDate);                                   if (realLen <= 0)

                                  {

                                      this.Invoke(addTextDelegate, pSocket.RemoteEndPoint.ToString() + \"退出\\r\\n\");                                       socketList.Remove(pSocket);

                                      //客户端退出的时候会发送一个空字节

                                      pSocket.Shutdown(SocketShutdown.Both);

                                      pSocket.Close();                                       return;

                                  }

                                  string receiveStr = Encoding.Default.GetString(bufferDate, 0, realLen);

                                  switch (receiveStr)

                                  {

                                      case \"MEAS:VOLTage:ALL?\\n\":

                                          proxSocket.Send(Encoding.Default.GetBytes(r.Next(16,25).ToString()+ \",\"+r.Next(16, 25).ToString()+\",\"+ r.Next(16, 25).ToString()));

                                          break;

                                      case \"MEAS:CURR:ALL?\\n\":

                                          proxSocket.Send(Encoding.Default.GetBytes(r.Next(2, 5).ToString() + \",\" + r.Next(2, 5).ToString() + \",\" + r.Next(2, 5).ToString()));

                                          break;

                                      default:

                                          break;

                                  }

                                  this.Invoke(addTextDelegate, receiveStr + \"from\" + pSocket.RemoteEndPoint.ToString() + \"\\r\\n\");

                              }

                              catch (Exception ex)

                              {

                                  this.Invoke(addTextDelegate, pSocket.RemoteEndPoint.ToString() + \"异常退出\\r\\n\");                                   socketList.Remove(pSocket);

                                  pSocket.Shutdown(SocketShutdown.Both);

                                  pSocket.Close();

                                  return;

                              }

                          }

在While循环中加入:

 switch (receiveStr)
{
  case \"MEAS:VOLTage:ALL?\\n\":
  proxSocket.Send(Encoding.Default.GetBytes(r.Next(16,25).ToString()+ \",\"+r.Next(16, 25).ToString()+\",\"+ r.Next(16, 25).ToString()));
  break;
  case \"MEAS:CURR:ALL?\\n\":
  proxSocket.Send(Encoding.Default.GetBytes(r.Next(2, 5).ToString() + \",\" + r.Next(2, 5).ToString() + \",\" + r.Next(2, 5).ToString()));
  break;
  default:
  break;

}

模拟电源,当收到电压查询时,发送16~25中随机数,由于电源是三个通道的,因此发送三个随机数,用逗号隔开。同样收到电流查询,发送2~5之间的随机数。

完整的客户端源码:

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            addTextDelegate = new AddTextDelegate(AddText);
        }
        private AddTextDelegate addTextDelegate;
        private List<Socket> socketList = new List<Socket>();

        public delegate void AddTextDelegate(string text);
        private void AddText(string text)
        {
            txtLog.Text += text;
        }

        Random r = new Random();

        private void btnStart_Click(object sender, EventArgs e)
        {
            //参数:寻址方式    传输数据方式  通信协议
            Socket socket = new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);

            IPAddress iPAddress = IPAddress.Parse(txtIP.Text);

            //创建EndPoint
            IPEndPoint iPEndPoint = new IPEndPoint(iPAddress, int.Parse(txtPort.Text));

            //绑定端口
            socket.Bind(iPEndPoint);

            //开启侦听
            socket.Listen(10);

            txtLog.Text += \"服务启动开启侦听……\\r\\n\";

            Thread thread = new Thread((s) =>
              {
                  Socket serSocket = (Socket)s;
                  while (true)//不断接收客户端连接
                  {
                      this.Invoke(addTextDelegate, \"服务正在等待客户端连接……\\r\\n\");

                      //开始接收客户端的连接
                      //阻塞当前线程,等待客户端连接
                      //客户端连接上之后,服务端自动生成一个socket和连接的客端通信
                      Socket proxSocket = serSocket.Accept();

                      this.Invoke(addTextDelegate, \"客户端连接成功!\\r\\n\" + proxSocket.RemoteEndPoint.ToString());

                      //proxSocket.Send(Encoding.Default.GetBytes(\"连接成功!\"));

                      socketList.Add(proxSocket);//当前通信的socket放到集合中

                      new Thread(p =>
                      {
                          Socket pSocket = (Socket)p;
                          while (true)
                          {
                              try
                              {
                                  byte[] bufferDate = new byte[1024];
                                  int realLen = pSocket.Receive(bufferDate);

                                  if (realLen <= 0)
                                  {
                                      this.Invoke(addTextDelegate, pSocket.RemoteEndPoint.ToString() + \"退出\\r\\n\");

                                      socketList.Remove(pSocket);
                                      //客户端退出的时候会发送一个空字节
                                      pSocket.Shutdown(SocketShutdown.Both);
                                      pSocket.Close();

                                      return;
                                  }
                                  string receiveStr = Encoding.Default.GetString(bufferDate, 0, realLen);
                                  switch (receiveStr)
                                  {
                                      case \"MEAS:VOLTage:ALL?\\n\":
                                          proxSocket.Send(Encoding.Default.GetBytes(r.Next(16,25).ToString()+ \",\"+r.Next(16, 25).ToString()+\",\"+ r.Next(16, 25).ToString()));
                                          break;
                                      case \"MEAS:CURR:ALL?\\n\":
                                          proxSocket.Send(Encoding.Default.GetBytes(r.Next(2, 5).ToString() + \",\" + r.Next(2, 5).ToString() + \",\" + r.Next(2, 5).ToString()));
                                          break;
                                      default:
                                          break;
                                  }
                                  this.Invoke(addTextDelegate, receiveStr + \"from\" + pSocket.RemoteEndPoint.ToString() + \"\\r\\n\");
                              }
                              catch (Exception ex)
                              {
                                  this.Invoke(addTextDelegate, pSocket.RemoteEndPoint.ToString() + \"异常退出\\r\\n\");

                                  socketList.Remove(pSocket);
                                  pSocket.Shutdown(SocketShutdown.Both);
                                  pSocket.Close();
                                  return;
                              }
                          }
                      })
                      { IsBackground = true }.Start(proxSocket);
                  }
              });
            thread.IsBackground = true;
            thread.Start(socket);
           
        }

        private void btnSend_Click(object sender, EventArgs e)
        {
            string str = txtSend.Text;
            byte[] data = Encoding.Default.GetBytes(str);
            foreach (var socket in socketList)
            {
                if (socket != null && socket.Connected)
                {
                    socket.Send(data);
                }
            }
        }
    }

上位机实现客户端功能。具体如下:

1、字段和属性

public readonly IPEndPoint TagetIPEP; public bool IsConnected { get; set; } = false; private Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp) { /*ReceiveTimeout=1000,SendTimeout=1000*/}; private Thread recListenThread; public string ReceiveStr { get; set; } public byte[] ReceiveByte { get; set; } TagetIPEP是服务器地址和端口。 IsConnected是连接的状态,这个比较重要,在发送和接收时,都要更加IsConnected进行,并更新IsConnected。 Socket用于和客户端通讯。 recListenThread是监听客户端消息的线程。 ReceiveStr和ReceiveByte用来存储客户端发来的消息。 2、方法函数 连接方法:

 public bool Connect()
        {
            try
            {
                socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp)
                {
                    //ReceiveTimeout = 1000,
                    //SendTimeout=1000
                };

                //IAsyncResult connResult = socket.BeginConnect(TagetIPEP.Address, TagetIPEP.Port, null, null);
                //connResult.AsyncWaitHandle.WaitOne(5000, true);
                //if (connResult.IsCompleted)
                //{
                socket.Connect(TagetIPEP.Address, TagetIPEP.Port);
                IsConnected = true;
                    //开启接收监听

                    recListenThread = new Thread(() =>
                    {
                        while (true)
                        {
                            try
                            {
                                ReceiveByte = new byte[1024];
                                int realLen = socket.Receive(ReceiveByte);
                                ReceiveStr = Encoding.Default.GetString(ReceiveByte, 0, realLen);
                                ReceiveEvent();
                                if (realLen <= 0)
                                {
                                    if (socket != null && socket.Connected)
                                    {
                                        //服务器退出
                                        IsConnected = false;
                                        Log.WriteLog(\"服务器退出!\");
                                        socket.Shutdown(SocketShutdown.Both);
                                        socket.Close();
                                        MessageBox.Show(\"连接断开!\");
                                    }
                                    return;
                                }
                            }
                            catch (Exception ex)
                            {
                                if (socket != null && socket.Connected)
                                {
                                    IsConnected = false;
                                    Log.WriteLog(\"服务器异常退出!\", ex);
                                    socket.Shutdown(SocketShutdown.Both);
                                    socket.Close();
                                }
                                return;
                            }
                        }
                    })
                    { IsBackground = true };
                    recListenThread.Start();
                    return true;
                //}

            }
            catch (Exception ex)
            {
                Log.WriteLog(TagetIPEP.Address + \"连接失败\", ex);
            }
            return false;
        }

 连接函数返回值为bool类型,根据返回值判断连接是否成功连接。这里每次连接都实例化了一个socket,因为在执行socket.close()后,重新打开会失败,而断线重连会经常用到,没有找到更好的方法,干脆重新实例化socket。连接成功后,开启监听服务端消息的线程。这里使用了一个ReceiveEvent()事件,在接收到消息时会触发这个事件,刷新UI界面。

发送方法:

   public bool Send(string msg)
        {
            byte[] sendMsg = Encoding.Default.GetBytes(msg);
            if (sendMsg.Length > 0&&IsConnected)
            {
                if (socket != null && socket.Connected)
                {
                    try
                    {
                        socket.Send(sendMsg);
                        return true;
                    }
                    catch (Exception ex)
                    {
                        IsConnected = false;
                        Log.WriteLog(\"发送数据失败,目标地址\" + TagetIPEP.Address, ex);
                    }
                }
            }

            return false;

        }

关闭方法:

    public void Close()
        {
            if (socket != null && socket.Connected)
            {
                IsConnected = false;
                recListenThread.Abort();
                Log.WriteLog(\"关闭连接!\");
                socket.Shutdown(SocketShutdown.Both);
                socket.Close();
            }
        }

在出现异常时调用

消息接收事件:

 public event Action ReceiveEvent;

每次接收消息时触发,获取属性ReceiveStr和ReceiveByte的值,刷新UI界面。

完整代码:

public class TCPClient
    {
        public TCPClient(/*IPEndPoint localIPEP,*/IPEndPoint targetIPEP)
        {
            //socket.Bind(localIPEP);
            TagetIPEP = targetIPEP;
           
        }

        public readonly IPEndPoint TagetIPEP;

        public bool IsConnected { get; set; } = false;

        private Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp) { /*ReceiveTimeout=1000,SendTimeout=1000*/};

        public bool Connect()
        {
            try
            {
                socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp)
                {
                    //ReceiveTimeout = 1000,
                    //SendTimeout=1000
                };

                //IAsyncResult connResult = socket.BeginConnect(TagetIPEP.Address, TagetIPEP.Port, null, null);
                //connResult.AsyncWaitHandle.WaitOne(5000, true);
                //if (connResult.IsCompleted)
                //{
                socket.Connect(TagetIPEP.Address, TagetIPEP.Port);
                IsConnected = true;
                    //开启接收监听

                    recListenThread = new Thread(() =>
                    {
                        while (true)
                        {
                            try
                            {
                                ReceiveByte = new byte[1024];
                                int realLen = socket.Receive(ReceiveByte);
                                ReceiveStr = Encoding.Default.GetString(ReceiveByte, 0, realLen);
                                ReceiveEvent();
                                if (realLen <= 0)
                                {
                                    if (socket != null && socket.Connected)
                                    {
                                        //服务器退出
                                        IsConnected = false;
                                        Log.WriteLog(\"服务器退出!\");
                                        socket.Shutdown(SocketShutdown.Both);
                                        socket.Close();
                                        MessageBox.Show(\"连接断开!\");
                                    }
                                    return;
                                }
                            }
                            catch (Exception ex)
                            {
                                if (socket != null && socket.Connected)
                                {
                                    IsConnected = false;
                                    Log.WriteLog(\"服务器异常退出!\", ex);
                                    socket.Shutdown(SocketShutdown.Both);
                                    socket.Close();
                                }
                                return;
                            }
                        }
                    })
                    { IsBackground = true };
                    recListenThread.Start();
                    return true;
                //}

            }
            catch (Exception ex)
            {
                Log.WriteLog(TagetIPEP.Address + \"连接失败\", ex);
            }
            return false;
        }

        public bool Send(string msg)
        {
            byte[] sendMsg = Encoding.Default.GetBytes(msg);
            if (sendMsg.Length > 0&&IsConnected)
            {
                if (socket != null && socket.Connected)
                {
                    try
                    {
                        socket.Send(sendMsg);
                        return true;
                    }
                    catch (Exception ex)
                    {
                        IsConnected = false;
                        Log.WriteLog(\"发送数据失败,目标地址\" + TagetIPEP.Address, ex);
                    }
                }
            }

            return false;

        }

        public event Action ReceiveEvent;

        public string ReceiveStr { get; set; }

        public byte[] ReceiveByte { get; set; }

        public void Close()
        {
            if (socket != null && socket.Connected)
            {
                IsConnected = false;
                recListenThread.Abort();
                Log.WriteLog(\"关闭连接!\");
                socket.Shutdown(SocketShutdown.Both);
                socket.Close();
            }
        }

        private Thread recListenThread;

    }

前台调用,声明Timer定时器,每个一秒触发一次。触发事件如下:

 

        private string flag = \"\";
        private void QueryTimer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
        {
            Now = DateTime.Now;

            if (!tcp.Send(\"MEAS:VOLTage:ALL?\\n\"))
            {
                queryTimer.Enabled = false;
                StartContent = \"开始\";
                ConnContent = \"连接\";
                tcp.IsConnected = false;
                MessageBox.Show(\"查询失败!\");
                return;
            }
            flag = \"V\";
            Thread.Sleep(50);

            if (!tcp.Send(\"MEAS:CURR:ALL?\\n\"))
            {
                queryTimer.Enabled = false;
                StartContent = \"开始\";
                ConnContent = \"连接\";
                tcp.IsConnected = false;
                MessageBox.Show(\"查询失败!\");
                return;
            }
            flag = \"C\";

            #region 测试
            //angle += 18;
            //if (angle > 360)
            //{
            //    angle = 18;
            //}

            #endregion

        }

刷新UI界面的事件如下:

  private void Tcp_ReceiveEvent()
        {
            Task.Run(() =>
            {
                Application.Current.Dispatcher.Invoke(() =>
                {
                    RemoteIP = tcp.TagetIPEP.ToString();
                    switch (flag)
                    {
                        case \"V\":
                            VoltValue = Math.Round(Convert.ToDouble(tcp.ReceiveStr.Split(\',\')[0]), 3);
                            break;
                        case \"C\":
                            CurrentValue = Math.Round(Convert.ToDouble(tcp.ReceiveStr.Split(\',\')[0]), 3);
                            break;
                        default:
                            break;
                    }

                    #region 测试
                    //VoltValue = Math.Round(Math.Sin((angle) * pi / 180) * 16 + 16, 3);
                    //CurrentValue = Math.Round(Math.Sin((angle) * pi / 180) * 2.5 + 2.5, 3);
                    #endregion

                    VoltValues.Add(VoltValue);
                    CurrentValues.Add(CurrentValue);

                    if (VoltValues.Count > 30)
                    {
                        VoltValues.RemoveAt(0);
                        CurrentValues.RemoveAt(0);
                    }
                });
            });
        }

 

 

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