下位機使用北京大華程控電源DH1766-1，上位機使用WPF。實現了電壓電流實時采集，曲線顯示。上午在公司調試成功，手頭沒有程控電源，使用TCP服務端模擬。昨天寫的TCP服務端正好排上用場。
界面如下：
服務端
服務端實在上篇基礎上實現的。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); //客戶端退出的時候會發送一個空字節 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() + "異常退出/r/n"); socketList.Remove(pSocket); pSocket.Shutdown(SocketShutdown.Both); pSocket.Close(); return; } }在While循環中加入：
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;}模擬電源，當收到電壓查詢時，發送16~25中隨機數，由于電源是三個通道的，因此發送三個隨機數，用逗號隔開。同樣收到電流查詢，發送2~5之間的隨機數。
完整的客戶端源碼：
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) { //參數：尋址方式 傳輸數據方式 通信協議 Socket socket = new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp); IPAddress iPAddress = IPAddress.Parse(txtIP.Text); //創建EndPoint IPEndPoint iPEndPoint = new IPEndPoint(iPAddress, int.Parse(txtPort.Text)); //綁定端口 socket.Bind(iPEndPoint); //開啟偵聽 socket.Listen(10); txtLog.Text += "服務啟動開啟偵聽……/r/n"; Thread thread = new Thread((s) => { Socket serSocket = (Socket)s; while (true)//不斷接收客戶端連接 { this.Invoke(addTextDelegate, "服務正在等待客戶端連接……/r/n"); //開始接收客戶端的連接 //阻塞當前線程，等待客戶端連接 //客戶端連接上之后，服務端自動生成一個socket和連接的客端通信 Socket proxSocket = serSocket.Accept(); this.Invoke(addTextDelegate, "客戶端連接成功！/r/n" + proxSocket.RemoteEndPoint.ToString()); //proxSocket.Send(Encoding.Default.GetBytes("連接成功！")); socketList.Add(proxSocket);//當前通信的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); //客戶端退出的時候會發送一個空字節 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() + "異常退出/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); } } } }上位機實現客戶端功能。具體如下：
1、字段和屬性
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是服務器地址和端口。
IsConnected是連接的狀態，這個比較重要，在發送和接收時，都要更加IsConnected進行，并更新IsConnected。
Socket用于和客戶端通訊。
recListenThread是監聽客戶端消息的線程。
ReceiveStr和ReceiveByte用來存儲客戶端發來的消息。
2、方法函數連接方法：
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; //開啟接收監聽 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) { //服務器退出 IsConnected = false; Log.WriteLog("服務器退出！"); socket.Shutdown(SocketShutdown.Both); socket.Close(); MessageBox.Show("連接斷開！"); } return; } } catch (Exception ex) { if (socket != null && socket.Connected) { IsConnected = false; Log.WriteLog("服務器異常退出！", ex); socket.Shutdown(SocketShutdown.Both); socket.Close(); } return; } } }) { IsBackground = true }; recListenThread.Start(); return true; //} } catch (Exception ex) { Log.WriteLog(TagetIPEP.Address + "連接失敗", ex); } return false; }連接函數返回值為bool類型，根據返回值判斷連接是否成功連接。這里每次連接都實例化了一個socket，因為在執行socket.close()后，重新打開會失敗，而斷線重連會經常用到，沒有找到更好的方法，干脆重新實例化socket。連接成功后，開啟監聽服務端消息的線程。這里使用了一個ReceiveEvent()事件，在接收到消息時會觸發這個事件，刷新UI界面。
發送方法：
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("發送數據失敗,目標地址" + TagetIPEP.Address, ex); } } } return false; }關閉方法：
public void Close() { if (socket != null && socket.Connected) { IsConnected = false; recListenThread.Abort(); Log.WriteLog("關閉連接！"); socket.Shutdown(SocketShutdown.Both); socket.Close(); } }在出現異常時調用
消息接收事件：
public event Action ReceiveEvent;
每次接收消息時觸發，獲取屬性ReceiveStr和ReceiveByte的值，刷新UI界面。
完整代碼：
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; //開啟接收監聽 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) { //服務器退出 IsConnected = false; Log.WriteLog("服務器退出！"); socket.Shutdown(SocketShutdown.Both); socket.Close(); MessageBox.Show("連接斷開！"); } return; } } catch (Exception ex) { if (socket != null && socket.Connected) { IsConnected = false; Log.WriteLog("服務器異常退出！", ex); socket.Shutdown(SocketShutdown.Both); socket.Close(); } return; } } }) { IsBackground = true }; recListenThread.Start(); return true; //} } catch (Exception ex) { Log.WriteLog(TagetIPEP.Address + "連接失敗", 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("發送數據失敗,目標地址" + 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("關閉連接！"); socket.Shutdown(SocketShutdown.Both); socket.Close(); } } private Thread recListenThread; }前臺調用，聲明Timer定時器，每個一秒觸發一次。觸發事件如下：
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 = "開始"; ConnContent = "連接"; tcp.IsConnected = false; MessageBox.Show("查詢失敗！"); return; } flag = "V"; Thread.Sleep(50); if (!tcp.Send("MEAS:CURR:ALL?/n")) { queryTimer.Enabled = false; StartContent = "開始"; ConnContent = "連接"; tcp.IsConnected = false; MessageBox.Show("查詢失??！"); return; } flag = "C"; #region 測試 //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 測試 //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內容，希望對大家的學習有所幫助，也希望大家多多支持武林網。
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