比尔云BierYun--阿里云最新优惠活动
阿里云优惠码丨阿里云代金券

C# WPF上位机实现和下位机TCP通讯

C# WPF上位机实现和下位机TCP通讯

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:

复制代码
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;
}
}
复制代码

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:

复制代码
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);
                }
            }
        }
    }
复制代码

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:
复制代码
 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;
        }
复制代码

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:

复制代码
   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;

        }
复制代码

关闭方法:

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

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:

复制代码
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;

    }
复制代码

前台调用,声明Timer定时器,每个一秒触发一次。触发事件如下:

 

复制代码
        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

        }
复制代码

刷新UI界面的事件如下:

复制代码
  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);
                    }
                });
            });
        }
复制代码

原文地址https://www.cnblogs.com/Samberger/p/10561243.html

未经允许不得转载:阿里云代金券 » C# WPF上位机实现和下位机TCP通讯

评论 抢沙发

  • 昵称 (必填)
  • 邮箱 (必填)
  • 网址

强烈推荐

高性能SSD云服务器ECS抗攻击,高可用云数据库RDS