C# WPF上位机实现和下位机TCP通讯的方法

2020-01-24 00:06:54

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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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