C#通讯编程（整理）TCP/UDP通讯

namespace  UDPServer

{

     class  Program

     {

         static  void  Main( string [] args)

         {

             int  recv;

             byte [] data =  new  byte [1024]; 

 

             //构建TCP 服务器

 

             //得到本机IP，设置TCP端口号         

             IPEndPoint ipep =  new  IPEndPoint(IPAddress.Any , 8001);

             Socket newsock =  new  Socket(AddressFamily.InterNetwork

, SocketType.Dgram , ProtocolType.Udp);

 

             //绑定网络地址

             newsock.Bind(ipep);

 

             Console.WriteLine( "This is a Server, host name is {0}" ,Dns.GetHostName());

 

             //等待客户机连接

             Console.WriteLine( "Waiting for a client..." );

 

             //得到客户机IP

             IPEndPoint sender =  new  IPEndPoint(IPAddress.Any, 0);

             EndPoint Remote = (EndPoint)(sender);

             recv = newsock.ReceiveFrom(data,  ref  Remote);

             Console .WriteLine ( "Message received from {0}: " , Remote.ToString ());

             Console .WriteLine (Encoding .ASCII .GetString (data ,0,recv ));

 

             //客户机连接成功后，发送欢迎信息

             string  welcome =  "Welcome ! " ;

 

             //字符串与字节数组相互转换

             data  = Encoding .ASCII .GetBytes (welcome );

 

             //发送信息

             newsock .SendTo (data ,data.Length ,SocketFlags .None ,Remote );

             while  ( true  )

             {

                 data = new  byte  [1024];

                 //发送接受信息

                 recv =newsock.ReceiveFrom(data , ref  Remote);

                 Console .WriteLine (Encoding .ASCII .GetString (data ,0,recv));

                 newsock .SendTo (data ,recv ,SocketFlags .None ,Remote );

             }

         }

 

         }

     }







using  System;

using  System.Collections.Generic;

using  System.Linq;

using  System.Text;

using  System.Net;

using  System.Net.Sockets;

 

namespace  UDPClient

{

     class  Program

     {

         static  void  Main( string [] args)

         {

             byte [] data =  new  byte [1024];

             string  input ,stringData;

 

             //构建TCP 服务器

 

             Console.WriteLine( "This is a Client, host name is {0}" , Dns.GetHostName());

 

             //设置服务IP，设置TCP端口号

             IPEndPoint ipep =  new  IPEndPoint(IPAddress .Parse ( "127.0.0.1" ) , 8001);

 

             //定义网络类型，数据连接类型和网络协议UDP

             Socket server =  new  Socket(AddressFamily.InterNetwork

, SocketType.Dgram, ProtocolType.Udp);

 

             string  welcome =  "Hello! " ;

             data = Encoding.ASCII.GetBytes(welcome);

             server.SendTo(data, data.Length, SocketFlags.None, ipep);

             IPEndPoint sender =  new  IPEndPoint(IPAddress.Any, 0);

             EndPoint Remote = (EndPoint)sender;

 

             data =  new  byte [1024];

             int  recv = server.ReceiveFrom(data,  ref  Remote);

             Console.WriteLine( "Message received from {0}: " , Remote.ToString());

             Console.WriteLine(Encoding .ASCII .GetString (data,0,recv));

             while  ( true )

             {

                 input = Console .ReadLine ();

                 if  (input == "exit" )

                     break  ;

                 server .SendTo (Encoding .ASCII .GetBytes (input ),Remote );

                 data =  new  byte  [1024];

                 recv = server.ReceiveFrom(data,  ref  Remote);

                 stringData = Encoding.ASCII.GetString(data, 0, recv);

                 Console.WriteLine(stringData);

             }

             Console .WriteLine ( "Stopping Client." );

             server .Close ();            

         }

 

         }

     }

简单的UDP


try

                     {

                         Socket s =  new  Socket(AddressFamily.InterNetwork

, SocketType.Dgram, ProtocolType.Udp);   //向此网段发广播包

                           int  UDPListenerPort = 8082;

                         IPAddress broadcast = IPAddress.Parse( "192.168.0.255" );  //此处根据IP及子网掩码改为相应的广播IP

                         string  ts =  "This is UPD string for sending" ;

                         byte [] sendbuf = Encoding.ASCII.GetBytes(ts);

                         IPEndPoint ep =  new  IPEndPoint(broadcast, UDPListenerPort);

                         s.SendTo(sendbuf, ep);

 

                     }

                     catch  (Exception e)

                     {}

UdpClient listener;

             int  UDPListenerPort = 8082;

             IPEndPoint groupEP =  new  IPEndPoint(IPAddress.Any, UDPListenerPort);

 

             try

             {

                 while  ( true )

                 {

                     byte [] bytes = listener.Receive( ref  groupEP);

                     string  RecIP = groupEP.ToString()

.Substring(0, groupEP.ToString().IndexOf( ":" ));   //收到发送UPD端的IP

                     string  RecStr = Encoding.ASCII.GetString(bytes, 0, bytes.Length);    //收到的UPD字符串

                 }

             }

             catch

             {}