C# WPF上位機實現(xiàn)和下位機TCP通訊的方法
更新時間：2019年03月20日 14:37:43 作者：Samberger
這篇文章主要介紹了C# WPF上位機實現(xiàn)和下位機TCP通訊的方法，小編覺得挺不錯的，現(xiàn)在分享給大家，也給大家做個參考。一起跟隨小編過來看看吧
下位機使用北京大華程控電源DH1766-1，上位機使用WPF。實現(xiàn)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(xiàn)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(fā)送一個空字節(jié)
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(huán)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(fā)送16~25中隨機數(shù)，由于電源是三個通道的，因此發(fā)送三個隨機數(shù)，用逗號隔開。同樣收到電流查詢，發(fā)送2~5之間的隨機數(shù)。
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(shù)：尋址方式 傳輸數(shù)據(jù)方式 通信協(xié)議
Socket socket = new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);
IPAddress iPAddress = IPAddress.Parse(txtIP.Text);
//創(chuàng)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(fā)送一個空字節(jié)
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(xiàn)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(tài)，這個比較重要，在發(fā)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(jiān)聽客戶端消息的線程。
ReceiveStr和ReceiveByte用來存儲客戶端發(fā)來的消息。
2、方法函數(shù)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(jiān)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(shù)返回值為bool類型，根據(jù)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(zhí)行socket.close()后，重新打開會失敗，而斷線重連會經(jīng)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(jiān)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(fā)這個事件，刷新UI界面。
發(fā)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(fā)送數(shù)據(jù)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(xiàn)異常時調用
消息接收事件：
public event Action ReceiveEvent;
每次接收消息時觸發(fā)，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(jiān)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(fā)送數(shù)據(jù)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(fā)一次。觸發(fā)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("查詢失敗！");
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(nèi)容，希望對大家的學習有所幫助，也希望大家多多支持腳本之家。
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