实例解析SOCKET编程模型（二）

以下是同步聊天程序的客户端源代码。其中的一些过程可以参考服务器端源码

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.Text;
namespace 聊天_socket_client
{
 /// <summary>
 /// Form1 的摘要说明。
 /// </summary>
 public class Form1 : System.Windows.Forms.Form
 {
  private System.Windows.Forms.Label label4;
  private System.Windows.Forms.Label label3;
  private System.Windows.Forms.Label label2;
  private System.Windows.Forms.Label label1;
  private System.Windows.Forms.Button btnStop;
  private System.Windows.Forms.Button btnSend;
  private System.Windows.Forms.TextBox txtPort;
  private System.Windows.Forms.TextBox txtServer;
  private System.Windows.Forms.RichTextBox rtbSend;
  private System.Windows.Forms.RichTextBox rtbReceive;
  private System.Windows.Forms.StatusBar statusBar1;
  private System.Windows.Forms.Button btnConnect;
  private IPAddress hostIPAddress;
  private IPEndPoint Server;
  private Socket sock;
  /// <summary>
  /// 必需的设计器变量。
  /// </summary>
  private System.ComponentModel.Container components = null;

  public Form1()
  {
   //
   // Windows 窗体设计器支持所必需的
   //
   InitializeComponent();

   //
   // TODO: 在 InitializeComponent 调用后添加任何构造函数代码
   //
  }

  /// <summary>
  /// 清理所有正在使用的资源。
  /// </summary>
  protected override void Dispose( bool disposing )
  {
   if( disposing )
   {
    if (components != null)
    {
     components.Dispose();
    }
   }
   base.Dispose( disposing );
  }

  #region Windows 窗体设计器生成的代码
  /// <summary>
  /// 设计器支持所需的方法 - 不要使用代码编辑器修改
  /// 此方法的内容。
  /// </summary>
  private void InitializeComponent()
  {
   this.label4 = new System.Windows.Forms.Label();
   this.label3 = new System.Windows.Forms.Label();
   this.label2 = new System.Windows.Forms.Label();
   this.label1 = new System.Windows.Forms.Label();
   this.btnStop = new System.Windows.Forms.Button();
   this.btnSend = new System.Windows.Forms.Button();
   this.btnConnect = new System.Windows.Forms.Button();
   this.txtPort = new System.Windows.Forms.TextBox();
   this.txtServer = new System.Windows.Forms.TextBox();
   this.rtbSend = new System.Windows.Forms.RichTextBox();
   this.rtbReceive = new System.Windows.Forms.RichTextBox();
   this.statusBar1 = new System.Windows.Forms.StatusBar();
   this.SuspendLayout();
   //
   // label4
   //
   this.label4.Location = new System.Drawing.Point(16, 152);
   this.label4.Name = "label4";
   this.label4.Size = new System.Drawing.Size(64, 23);
   this.label4.TabIndex = 22;
   this.label4.Text = "发送信息:";
   //
   // label3
   //
   this.label3.Location = new System.Drawing.Point(16, 64);
   this.label3.Name = "label3";
   this.label3.Size = new System.Drawing.Size(64, 23);
   this.label3.TabIndex = 21;
   this.label3.Text = "接收信息:";
   //
   // label2
   //
   this.label2.Location = new System.Drawing.Point(216, 16);
   this.label2.Name = "label2";
   this.label2.Size = new System.Drawing.Size(64, 23);
   this.label2.TabIndex = 20;
   this.label2.Text = "监听端口:";
   //
   // label1
   //
   this.label1.Location = new System.Drawing.Point(16, 16);
   this.label1.Name = "label1";
   this.label1.Size = new System.Drawing.Size(56, 23);
   this.label1.TabIndex = 19;
   this.label1.Text = "服务器:";
   //
   // btnStop
   //
   this.btnStop.Location = new System.Drawing.Point(256, 256);
   this.btnStop.Name = "btnStop";
   this.btnStop.TabIndex = 18;
   this.btnStop.Text = "关闭连接";
   this.btnStop.Click += new System.EventHandler(this.btnStop_Click);
   //
   // btnSend
   //
   this.btnSend.Location = new System.Drawing.Point(144, 256);
   this.btnSend.Name = "btnSend";
   this.btnSend.TabIndex = 17;
   this.btnSend.Text = "发送信息";
   this.btnSend.Click += new System.EventHandler(this.btnSend_Click);
   //
   // btnConnect
   //
   this.btnConnect.Location = new System.Drawing.Point(32, 256);
   this.btnConnect.Name = "btnConnect";
   this.btnConnect.TabIndex = 16;
   this.btnConnect.Text = "请求连接";
   this.btnConnect.Click += new System.EventHandler(this.btnConnect_Click);
   //
   // txtPort
   //
   this.txtPort.Location = new System.Drawing.Point(288, 16);
   this.txtPort.Name = "txtPort";
   this.txtPort.Size = new System.Drawing.Size(48, 21);
   this.txtPort.TabIndex = 15;
   this.txtPort.Text = "19811";
   //
   // txtServer
   //
   this.txtServer.Location = new System.Drawing.Point(72, 16);
   this.txtServer.Name = "txtServer";
   this.txtServer.TabIndex = 14;
   this.txtServer.Text = "127.0.0.1";
   //
   // rtbSend
   //
   this.rtbSend.Location = new System.Drawing.Point(80, 152);
   this.rtbSend.Name = "rtbSend";
   this.rtbSend.Size = new System.Drawing.Size(264, 96);
   this.rtbSend.TabIndex = 13;
   this.rtbSend.Text = "";
   //
   // rtbReceive
   //
   this.rtbReceive.Location = new System.Drawing.Point(80, 56);
   this.rtbReceive.Name = "rtbReceive";
   this.rtbReceive.Size = new System.Drawing.Size(264, 96);
   this.rtbReceive.TabIndex = 12;
   this.rtbReceive.Text = "";
   //
   // statusBar1
   //
   this.statusBar1.Location = new System.Drawing.Point(0, 287);
   this.statusBar1.Name = "statusBar1";
   this.statusBar1.ShowPanels = true;
   this.statusBar1.Size = new System.Drawing.Size(360, 22);
   this.statusBar1.TabIndex = 23;
   this.statusBar1.Text = "statusBar1";
   //
   // Form1
   //
   this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
   this.ClientSize = new System.Drawing.Size(360, 309);
   this.Controls.Add(this.statusBar1);
   this.Controls.Add(this.label4);
   this.Controls.Add(this.label3);
   this.Controls.Add(this.label2);
   this.Controls.Add(this.label1);
   this.Controls.Add(this.btnStop);
   this.Controls.Add(this.btnSend);
   this.Controls.Add(this.btnConnect);
   this.Controls.Add(this.txtPort);
   this.Controls.Add(this.txtServer);
   this.Controls.Add(this.rtbSend);
   this.Controls.Add(this.rtbReceive);
   this.Name = "Form1";
   this.Text = "聊天程序－客户端";
   this.Closing += new System.ComponentModel.CancelEventHandler(this.Form1_Closing);
   this.ResumeLayout(false);

  }
  #endregion

  /// <summary>
  /// 应用程序的主入口点。
  /// </summary>
  [STAThread]
  static void Main()
  {
   Application.Run(new Form1());
  }

  private void btnConnect_Click(object sender, System.EventArgs e)
  {
   try
   {
    hostIPAddress=IPAddress.Parse(txtServer.Text);
   }
   catch{MessageBox.Show("请输入正确的IP地址格式。");}
   try
   {
    Server=new IPEndPoint(hostIPAddress,Int32.Parse(txtPort.Text));
    sock=new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);
    sock.Connect(Server);
    statusBar1.Text="与主机"+txtServer.Text+"端口"+txtPort.Text+"连接成功";
    Thread thread=new Thread(new ThreadStart(ThreadProc));
    thread.Start();
   }
   catch(Exception ee){MessageBox.Show(ee.Message);}
  }
  private void ThreadProc()
  {
    while(true)
    {
     Byte[] ByteRecv=new Byte[256];
     sock.Receive(ByteRecv,ByteRecv.Length,0);
     string strRecv=Encoding.BigEndianUnicode.GetString(ByteRecv);
     rtbReceive.AppendText(strRecv+"\r\n");
    }
   }

  private void btnSend_Click(object sender, System.EventArgs e)
  {
   try
   {
    string strSend ="Client--->"+rtbSend.Text+"\r\n";
    Byte[] ByteSend = Encoding.BigEndianUnicode.GetBytes(strSend);
    sock.Send(ByteSend,ByteSend.Length,0);
   }
   catch{MessageBox.Show("连接尚未建立,无法发送.");}
  }

  private void btnStop_Click(object sender, System.EventArgs e)
  {
   try
   {
    sock.Close();
    statusBar1.Text="与主机"+txtServer.Text+"端口"+txtPort.Text+"断开连接";
   }
   catch{MessageBox.Show("连接尚未建立,关闭无效");}
  }

  private void Form1_Closing(object sender, System.ComponentModel.CancelEventArgs e)
  {
   try
   {
    sock.Close();
   }
   catch{}
  }
 }
}

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