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{}
}
}
}