C#上位機之—WinForm實現Socket異步通信示例

工做中經常使用到的一些知識點，老是用完就忘，第一次嘗試用博客記錄下來，以備後用；

Socket通信，Socket（套接字）是基於TCP/IP通信方式的封裝好的類，調用時須要添加下面的服務引用：

.......
10 using System.Net; 11 using System.Net.Sockets;

窗體頁面搭建，上面爲服務器區，下面爲客戶端區：

創建兩個類，一個表示服務器，一個表示客戶端，

首先創建服務器類：

1.聲明變量：IP地址，端口號，EndPoint，Socket類，數據Buffer等

 1         string ip;//IP地址
 2         string port;//端口號
 3         IPEndPoint endPoint;//網絡端點
 4         Socket socServer;//偵聽鏈接套接字
 5         Socket socClient;//通信套接字
 6         byte[] dataReceived = new byte[50000];  7 
 8         public delegate void delegateDisplayMsg(string type,string msg);  9         public delegateDisplayMsg OnDisplay; 10 
11         public SocketServer() 12  { 13             socServer = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); 14         }

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2.偵聽鏈接函數：

public void StartListen(string ip,string port) { this.ip = ip; this.port = port; endPoint = new IPEndPoint(IPAddress.Parse(this.ip), int.Parse(port)); socServer.Bind(endPoint); socServer.Listen(0); socServer.BeginAccept(new AsyncCallback(OnClientConnect), null); ShowMsg("Wait Connect"); }

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3.接受數據函數：

public void OnClientConnect(IAsyncResult asyn) { socClient = socServer.EndAccept(asyn); WaitForData(); ShowMsg("Client Connected " + socClient.RemoteEndPoint.ToString()); } public void WaitForData() { if (socClient != null) socClient.BeginReceive(dataReceived, 0, dataReceived.Length, SocketFlags.None, new AsyncCallback(OnDataReceived), null); } public void OnDataReceived(IAsyncResult asyn) { int dataLength = socClient.EndReceive(asyn); byte[] chars = new byte[dataLength]; Buffer.BlockCopy(dataReceived, 0, chars, 0, dataLength); string msg = Encoding.ASCII.GetString(chars); ShowMsg("<=" + msg); WaitForData(); }

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4.發送數據函數：

public void SendMsg(string msg) { byte[] data = Encoding.Default.GetBytes(msg); socClient.Send(data); ShowMsg("=>" + msg); }

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而後創建客戶端類：

1.聲明變量

string ip;//IP地址
        string port;//端口號
        IPEndPoint endPoint;//網絡端點
        Socket socClient;//通信套接字
        byte[] dataReceived = new byte[50000];//數據Buffer

        public delegate void delegateDisplayMsg(string type,string msg); public delegateDisplayMsg OnDisplay; public SocketClient() { socClient = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); }

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2.鏈接服務器函數：

public void Connect(string ip, string port) { this.ip = ip; this.port = port; endPoint = new IPEndPoint(IPAddress.Parse(this.ip), int.Parse(port)); socClient.BeginConnect(endPoint, new AsyncCallback(OnToConnected), null); }

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3.接受數據函數：

public void OnToConnected(IAsyncResult asyn) { socClient.EndConnect(asyn); WaitForData(); ShowMsg("Connect Success"); } public void WaitForData() { if (socClient != null) socClient.BeginReceive(dataReceived, 0, dataReceived.Length, SocketFlags.None, new AsyncCallback(OnDataReceived), null); } public void OnDataReceived(IAsyncResult asyn) { int dataLenth = socClient.EndReceive(asyn); byte[] chars = new byte[dataLenth]; Buffer.BlockCopy(dataReceived, 0, chars, 0, dataLenth); string msg = Encoding.ASCII.GetString(chars); ShowMsg("<=" + msg); WaitForData(); }

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4.發送數據函數：

public void SendMsg(string msg) { byte[] data = Encoding.Default.GetBytes(msg); socClient.Send(data); ShowMsg("=>" + msg); }

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服務器類與客戶端類，已經創建完成，下面對兩個類進行實例化，並Link窗體控件的事件函數，以下：

1.實例化：

public void Init() { Server = new SocketServer(); Client = new SocketClient(); Server.OnDisplay += ShowMsg; Client.OnDisplay += ShowMsg; }

2.按鈕點擊事件：

private void btn_StartListen_Click(object sender, EventArgs e) { Server.StartListen(txt_serverIP.Text.ToString(), txt_serverPort.Text.ToString()); btn_StartListen.BackColor = Color.LimeGreen; } private void btn_Connect_Click(object sender, EventArgs e) { Client.Connect(txt_clientIP.Text.ToString(), txt_clientPort.Text.ToString()); } private void btn_serverSend_Click(object sender, EventArgs e) { Button b = (Button)sender; bool isServer = b.Name.Contains("server"); if (isServer) Server.SendMsg(txt_serverMsg.Text.ToString()); else Client.SendMsg(txt_clientMsg.Text.ToString()); }

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如今啓動程序，測試發送接收功能是否正常

至此，一個簡單的Socket通信模型已經完成，實際應用中還需考慮通信異常，通信協議，多個客戶端通信等事項，第一次寫博，歡迎你們多多指正；