C# WPF上位机实现和下位机TCP通讯的方法

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rn");
     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() + "rn");
 }
 catch (Exception ex)
 {
   this.Invoke(addTextDelegate, pSocket.RemoteEndPoint.ToString() + "异常退出rn");
   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 socketList = new List();

    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……rn";

      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……rn");

    //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！rn" + 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rn");

     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() + "rn");
 }
 catch (Exception ex)
 {
   this.Invoke(addTextDelegate, pSocket.RemoteEndPoint.ToString() + "异常退出rn");

   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) { };

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 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) { };

    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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