C# WPF上位机实现和下位机TCP通讯的方法_C#

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：

C# WPF上位机实现和下位机TCP通讯的方法

服务端

C# WPF上位机实现和下位机TCP通讯的方法

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);
        }
      });
    });
  }

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。

原文链接：http://www.cnblogs.com/Samberger/p/10561243.html