最近由于要做一些Socket方面的项目，所以又温习了一下Socket和TCP协议编程的一些基本知识，整理一下放在这里。

Socket基本编程

服务端：

using System.Net;

using System.Net.Sockets;

using System.Text;

using System.Threading;

         Thread mythread ;

         Socket socket;

// 清理所有正在使用的资源。

         protected override void Dispose( bool disposing )

         {

              try

　            { 　　            

　　          socket.Close();//释放资源

　　          mythread.Abort ( ) ;//中止线程

　            }

　            catch{ }

              if( disposing )

              {

                   if (components != null)

                   {

                       components.Dispose();

                   }

              }

              base.Dispose( disposing );

         }       

         public static IPAddress GetServerIP()

         {

              IPHostEntry ieh=Dns.GetHostByName(Dns.GetHostName());

              return ieh.AddressList[0];

         }

         private void BeginListen()

         {

              IPAddress ServerIp=GetServerIP();

              IPEndPoint iep=new IPEndPoint(ServerIp,8000);

              socket=new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);

              byte[] byteMessage=new byte[100]; 

              this.label1.Text=iep.ToString();

              socket.Bind(iep); 

//            do

              while(true)

              {

                   try

                   {

                       socket.Listen(5);

                       Socket newSocket=socket.Accept();

                       newSocket.Receive(byteMessage);

                       string sTime = DateTime.Now.ToShortTimeString ( ) ;

                       string msg=sTime+":"+"Message from:";

                       msg+=newSocket.RemoteEndPoint.ToString()+Encoding.Default.GetString(byteMessage);

                       this.listBox1.Items.Add(msg);

                   }

                   catch(SocketException ex)

                   {

                       this.label1.Text+=ex.ToString();

                   }

              }

//            while(byteMessage!=null);

         }

         //开始监听

         private void button1_Click(object sender, System.EventArgs e)

         {

              try

              {

                   mythread = new Thread(new ThreadStart(BeginListen));

                   mythread.Start();

              }

              catch(System.Exception er)

              {

                   MessageBox.Show(er.Message,"完成",MessageBoxButtons.OK,MessageBoxIcon.Stop);

              }           

         }

客户端：

using System.Net;

using System.Net.Sockets;

using System.Text;

         private void button1_Click(object sender, System.EventArgs e)

         {

              BeginSend();      

         }

         private void BeginSend()

         {            

              string ip=this.txtip.Text;

              string port=this.txtport.Text;

              IPAddress serverIp=IPAddress.Parse(ip);           

              int serverPort=Convert.ToInt32(port);

              IPEndPoint iep=new IPEndPoint(serverIp,serverPort); 

              byte[] byteMessage; 

//            do

//            {

                   Socket socket=new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);

                   socket.Connect(iep);

                   byteMessage=Encoding.ASCII.GetBytes(textBox1.Text);

                   socket.Send(byteMessage);

                   socket.Shutdown(SocketShutdown.Both);

                   socket.Close();

//            }

//            while(byteMessage!=null);

         }

基于TCP协议的发送和接收端

TCP协议的接收端
 

using System.Net.Sockets ; //使用到TcpListen类

using System.Threading ; //使用到线程 

using System.IO ; //使用到StreamReader类

         int port = 8000; //定义侦听端口号

         private Thread thThreadRead; //创建线程，用以侦听端口号，接收信息

         private TcpListener tlTcpListen; //侦听端口号

         private bool blistener = true; //设定标示位，判断侦听状态

         private NetworkStream nsStream; //创建接收的基本数据流 

         private StreamReader srRead;

         private System.Windows.Forms.StatusBar statusBar1;

         private System.Windows.Forms.Button button1;

         private System.Windows.Forms.ListBox listBox1; //从网络基础数据流中读取数据

         private TcpClient tcClient ;

         private void Listen ( )

         {

              try

              {

                   tlTcpListen = new TcpListener ( port ) ; //以8000端口号来初始化TcpListener实例

                   tlTcpListen.Start ( ) ; //开始监听

                   statusBar1.Text = "正在监听..." ;

                   tcClient = tlTcpListen.AcceptTcpClient ( ) ; //通过TCP连接请求

                   nsStream = tcClient.GetStream ( ) ; //获取用以发送、接收数据的网络基础数据流

                   srRead=new StreamReader(nsStream);//以得到的网络基础数据流来初始化StreamReader实例

                   statusBar1.Text = "已经连接！";

                   while( blistener ) //循环侦听

                   {

                       string sMessage = srRead.ReadLine();//从网络基础数据流中读取一行数据

                       if ( sMessage == "STOP" ) //判断是否为断开TCP连接控制码

                       {

                            tlTcpListen.Stop(); //关闭侦听

                            nsStream.Close(); //释放资源

                            srRead.Close();

                            statusBar1.Text = "连接已经关闭！" ;

                            thThreadRead.Abort(); //中止线程

                            return;

                       }

                       string sTime = DateTime.Now.ToShortTimeString ( ) ; //获取接收数据时的时间

                       listBox1.Items.Add ( sTime + " " + sMessage ) ;

                   }

              }

              catch ( System.Security.SecurityException )

              {

                   MessageBox.Show ( "侦听失败！" , "错误" ) ;

              }

         }

         //开始监听

         private void button1_Click(object sender, System.EventArgs e)

         {

              thThreadRead = new Thread ( new ThreadStart ( Listen ) );

              thThreadRead.Start();//启动线程          

              button1.Enabled=false;

         }

         // 清理所有正在使用的资源。

         protected override void Dispose( bool disposing )

         {

              try

              {

                   tlTcpListen.Stop(); //关闭侦听

                   nsStream.Close();

                   srRead.Close();//释放资源

                   thThreadRead.Abort();//中止线程

              }

              catch{}

              if( disposing )

              {

                   if (components != null)

                   {

                       components.Dispose();

                   }

              }

              base.Dispose( disposing );

         }

TCP协议的发送端

using System.Net.Sockets; //使用到TcpListen类

using System.Threading; //使用到线程

using System.IO; //使用到StreamWriter类

using System.Net; //使用IPAddress类、IPHostEntry类等

         private StreamWriter swWriter; //用以向网络基础数据流传送数据　

         private NetworkStream nsStream; //创建发送数据的网络基础数据流　

         private TcpClient tcpClient;

         private System.Windows.Forms.Button button1;

         private System.Windows.Forms.TextBox textBox1;

         private System.Windows.Forms.Button button2;

         private System.Windows.Forms.TextBox textBox2;

         private System.Windows.Forms.StatusBar statusBar1;

         private System.Windows.Forms.Label label1;

         private System.Windows.Forms.Label label2; //通过它实现向远程主机提出TCP连接申请　

         private bool tcpConnect = false; //定义标识符，用以表示TCP连接是否建立

         //连接　

         private void button1_Click(object sender, System.EventArgs e)

         {

              IPAddress ipRemote ;

              try

              {

                   ipRemote = IPAddress.Parse ( textBox1.Text ) ;

              }

              catch //判断给定的IP地址的合法性

              {

                   MessageBox.Show ( "输入的IP地址不合法！" , "错误提示！" ) ;

                   return ;

              }

              IPHostEntry ipHost ;

              try

              {

                   ipHost = Dns.Resolve ( textBox1.Text ) ;　

              }

              catch //判断IP地址对应主机是否在线

              {

                   MessageBox.Show ("远程主机不在线！" , "错误提示！" ) ;

                   return ;

              }

              string sHostName = ipHost.HostName ;

              try

              {

                   TcpClient tcpClient = new TcpClient(sHostName,8000);//对远程主机的8000端口提出TCP连接申请

                   nsStream = tcpClient.GetStream();//通过申请，并获取传送数据的网络基础数据流　　

                   swWriter = new StreamWriter(nsStream);//使用获取的网络基础数据流来初始化StreamWriter实例

                   button1.Enabled = false ;

                   button2.Enabled = true ;

                   tcpConnect = true ;

                   statusBar1.Text = "已经连接！" ;

              }

              catch

              {

                   MessageBox.Show ( "无法和远程主机8000端口建立连接！" , "错误提示！" ) ;

                   return ;

              }

         }

          //发送

         private void button2_Click(object sender, System.EventArgs e)

         {

              if (textBox2.Text !="")

              {

                   swWriter.WriteLine(textBox2.Text);//刷新当前数据流中的数据

                   swWriter.Flush();

              }

              else

              {

                   MessageBox.Show("发送信息不能为空！","错误提示！");

              }

         }

         // 清理所有正在使用的资源。

         protected override void Dispose( bool disposing )

         {

              if ( tcpConnect )

              {

                   swWriter.WriteLine ( "STOP" ) ; //发送控制码　　

                   swWriter.Flush (); //刷新当前数据流中的数据　　

                   nsStream.Close (); //清除资源

                   swWriter.Close ();

              }

              if( disposing )

              {

                   if (components != null)

                   {

                       components.Dispose();

                   }

              }

              base.Dispose( disposing );

         }