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基于TCP协议的发送和接收端

Posted on 2005-12-03 00:34  李天平  阅读(2172)  评论(3编辑  收藏  举报

   在上篇里介绍了Socket的基本编程,这次来看看.net封装的基于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

using System.Threading ; //使用到线程 

using System.IO ; //使用到StreamReader

 

         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 ) ; //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

using System.Threading; //使用到线程

using System.IO; //使用到StreamWriter

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 );

         }