1.学会把常见数据转换成网络流
2.学会通常的网络数据包结构
3.如果是用.net,学会用SOCKET

解决方案 »

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    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 );         }