一个socket问题 新手望大家支持下 顶猛点~~~

Question

我用socket写了一个服务端和客户端  当多客户端连进来后 其中一个或者多个突然关闭了自己的客户端 问：那么我服务端怎么知道这个客户端的连接已经不存在了？而且要关闭掉它

Answer 1

receive(){
                           try
{
                                    ... //这是接收数据的代码
}
catch (System.Net.Sockets.SocketException  e)
{
                                ... //如果客户端主动关闭了,会执行这里
}

catch( Exception e )
{
                                ...
}
}
记得接收数据应另开一个新线程来操作.

Answer 2

还在吗 给我看看这个代码 ：
我新起一个线程来执行这里的接受数据：但是我的CPU100% 不知道怎么回事private void ThreadProc() 
{ 
if(mySocket.Connected) 
{ 
statusBar1.Text="与客户建立连接."; 
while(true) 
{ 
Byte[] ByteRecv=new Byte[256]; 
mySocket.Receive(ByteRecv,ByteRecv.Length,0); 
string strRecv=Encoding.BigEndianUnicode.GetString(ByteRecv); 
rtbReceive.AppendText(strRecv+"\r\n"); 
} 
} 

Answer 3

Thread thread=new Thread(new ThreadStart(ThreadProc)); 
thread.Start();

Answer 4

通过服务器不断地发心跳包来判断客户断是否断掉.
我以前写socket时,发现客户端用任务管理器直接结果进程,服务器断会收不到客户端中断事件的.

Answer 5

if(mySocket.Connected) 
  //这句话有问题,你的mySocket是服务器端负责监听的socket吧!
Socket newSocket=mySocket.Accept()  这里返回一个新的socket,这个新Socket才是用来send和receive用的

Answer 6

服务端：using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;                  Thread mythread ;
         Socket socket;
           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);                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);              }                     }
你可以参考这个代码