详解C# Socket编程笔记

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;

namespace tcpserver
 {
   /// <summary>
   /// Class1 的摘要说明。
  /// </summary>
  class server
   {
     /// <summary>
     /// 应用程序的主入口点。
    /// </summary>
    [STAThread]
     static void Main(string[] args)
     {
       //
       // TODO: 在此处添加代码以启动应用程序
      //
      int recv;//用于表示客户端发送的信息长度
      byte[] data=new byte[1024];//用于缓存客户端所发送的信息,通过socket传递的信息必须为字节数组
      IPEndPoint ipep=new IPEndPoint(IPAddress.Any,9050);//本机预使用的IP和端口
      Socket newsock=new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);
       newsock.Bind(ipep);//绑定
      newsock.Listen(10);//监听
      Console.WriteLine("waiting for a client");
       Socket client=newsock.Accept();//当有可用的客户端连接尝试时执行，并返回一个新的socket,用于与客户端之间的通信
      IPEndPoint clientip=(IPEndPoint)client.RemoteEndPoint;
       Console.WriteLine("connect with client:"+clientip.Address+" at port:"+clientip.Port);
       string welcome="welcome here!";
       data=Encoding.ASCII.GetBytes(welcome);
       client.Send(data,data.Length,SocketFlags.None);//发送信息
      while(true)
       {//用死循环来不断的从客户端获取信息
        data=new byte[1024];
         recv=client.Receive(data);
         Console.WriteLine("recv="+recv);
         if (recv==0)//当信息长度为0，说明客户端连接断开
          break;
         Console.WriteLine(Encoding.ASCII.GetString(data,0,recv));
         client.Send(data,recv,SocketFlags.None);
       }
       Console.WriteLine("Disconnected from"+clientip.Address);
       client.Close();
       newsock.Close();

     }
   }
 }

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;

namespace tcpclient
 {
   /// <summary>
   /// Class1 的摘要说明。
  /// </summary>
  class client
   {
     /// <summary>
     /// 应用程序的主入口点。
    /// </summary>
    [STAThread]
     static void Main(string[] args)
     {
       //
       // TODO: 在此处添加代码以启动应用程序
      //
      byte[] data=new byte[1024];
       Socket newclient=new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);
       Console.Write("please input the server ip:");
       string ipadd=Console.ReadLine();
       Console.WriteLine();
       Console.Write("please input the server port:");
       int port=Convert.ToInt32(Console.ReadLine());
       IPEndPoint ie=new IPEndPoint(IPAddress.Parse(ipadd),port);//服务器的IP和端口
      try
       {
         //因为客户端只是用来向特定的服务器发送信息，所以不需要绑定本机的IP和端口。不需要监听。
        newclient.Connect(ie);
       }
       catch(SocketException e)
       {
         Console.WriteLine("unable to connect to server");
         Console.WriteLine(e.ToString());
         return;
       }
       int recv = newclient.Receive(data);
       string stringdata=Encoding.ASCII.GetString(data,0,recv);
       Console.WriteLine(stringdata);
       while(true)
       {
         string input=Console.ReadLine();
         if(input=="exit")
           break;
         newclient.Send(Encoding.ASCII.GetBytes(input));
         data=new byte[1024];
         recv=newclient.Receive(data);
         stringdata=Encoding.ASCII.GetString(data,0,recv);
         Console.WriteLine(stringdata);
       }
       Console.WriteLine("disconnect from sercer");
       newclient.Shutdown(SocketShutdown.Both);
       newclient.Close();

     }
   }
 }

using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.Net.Sockets;
namespace SimpleUdpSrvr
 {
   class Program
   {
     static void Main(string[] args)
     {
       int recv;
       byte[] data = new byte[1024];
       IPEndPoint ipep = new IPEndPoint(IPAddress.Any, 9050);//定义一网络端点
      Socket newsock = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);//定义一个Socket
      newsock.Bind(ipep);//Socket与本地的一个终结点相关联
      Console.WriteLine("Waiting for a client..");

       IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0);//定义要发送的计算机的地址
      EndPoint Remote = (EndPoint)(sender);//
      recv = newsock.ReceiveFrom(data, ref Remote);//接受数据      
      Console.WriteLine("Message received from{0}:", Remote.ToString());
       Console.WriteLine(Encoding.ASCII.GetBytes(data,0,recv));

       string welcome = "Welcome to my test server!";
       data = Encoding.ASCII.GetBytes(welcome);
       newsock.SendTo(data, data.Length, SocketFlags.None, Remote);
       while (true)
       {
         data = new byte[1024];
         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.Text;
using System.Net;
using System.Net.Sockets;
namespace SimpleUdpClient
 {
   class Program
   {
     static void Main(string[] args)
     {
       byte[] data = new byte[1024];//定义一个数组用来做数据的缓冲区
      string input, stringData;
       IPEndPoint ipep = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 9050);
       Socket server = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
       string welcome = "Hello,are you there?";
       data = Encoding.ASCII.GetBytes(welcome);
       server.SendTo(data, data.Length, SocketFlags.None, ipep);//将数据发送到指定的终结点

      IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0);
       EndPoint Remote = (EndPoint)sender;
       data = new byte[1024];
       int recv = server.ReceiveFrom(data, ref Remote);//接受来自服务器的数据

      Console.WriteLine("Message received from{0}:", Remote.ToString());
       Console.WriteLine(Encoding.ASCII.GetString(data, 0, recv));
       while (true)//读取数据
      {
         input = Console.ReadLine();//从键盘读取数据
        if (input == "text")//结束标记
        {
           break;
         }
         server.SendTo(Encoding.ASCII.GetBytes(input), Remote);//将数据发送到指定的终结点Remote
        data = new byte[1024];
         recv = server.ReceiveFrom(data, ref Remote);//从Remote接受数据
        stringData = Encoding.ASCII.GetString(data, 0, recv);
         Console.WriteLine(stringData);
       }
       Console.WriteLine("Stopping client");
       server.Close();
     }
   }
 }