无法判断TcpListener套接字是否仍然连接 [英] Can't tell if TcpListener socket is still connected

问题描述

我正在尝试使用TcpListener来判断客户端是否已使用以下代码关闭连接（基于 http://msdn.microsoft.com/en-us/library/system.net.sockets.socket.connected.aspx ），但它不起作用：

 static void Main（string [] args）
 {
 
 
 IPAddress ipAddress = GetIP（）; 
 System.Net.Sockets.TcpListener listener = new System.Net.Sockets.TcpListener（ipAddress，8888）; 
 listener.Start（）; 
 while（！listener.Pending（））; 
 System.Net.Sockets.Socket mySocket = listener.AcceptSocket（）; 
 Console.WriteLine（" Connected"）; 
 bool runFlag = true; 
 while（runFlag）{
 try 
 {
 byte [] tmp = new byte [1]; 
 mySocket.Blocking = false; 
 mySocket.Send（tmp，0,0）; 
} 
 catch（SocketException e）
 {
 if（e.NativeErrorCode.Equals（10035））// WSAEWOULDBLOCK 
 Console.WriteLine（" Still Connected，但发送会阻止"）; 
 else 
 {
 Console.WriteLine（" Disconnected：error code {0}！"，e.NativeErrorCode）; 
 runFlag = false; 
} 
} 
} 
 mySocket.Close（）; 
 listener.Stop（）; 
} 

有了这个我可以成功telnet到端口8888，但当我发出^]关闭时，程序无法告诉连接已经关闭。有人可以提供帮助吗？

提前致谢，

Juan Herera

解决方案

以下链接包含一些可能的想法帮助您

http： //social.msdn.microsoft.com/Forums/en-US/ncl/thread/f38884de-6ddc-48ea-9275-7b21087490cf

I'm trying to have a TcpListener tell if a client has closed a connection with the code below (based on http://msdn.microsoft.com/en-us/library/system.net.sockets.socket.connected.aspx), but it doesn't work:

static void Main(string[] args)
{


    IPAddress ipAddress=GetIP();
    System.Net.Sockets.TcpListener listener = new System.Net.Sockets.TcpListener(ipAddress, 8888);
    listener.Start();
    while(!listener.Pending());
    System.Net.Sockets.Socket mySocket = listener.AcceptSocket();
    Console.WriteLine("Connected");
    bool runFlag = true;
    while(runFlag) {
        try
        {
            byte[] tmp = new byte[1];
            mySocket.Blocking = false;
            mySocket.Send(tmp, 0, 0);
        }
        catch (SocketException e)
        {
            if (e.NativeErrorCode.Equals(10035)) // WSAEWOULDBLOCK
                Console.WriteLine("Still Connected, but the Send would block");
            else
            {
                Console.WriteLine("Disconnected: error code {0}!", e.NativeErrorCode);
                runFlag = false;
            }
        }
    }
    mySocket.Close();
    listener.Stop();
}

With this I can successfully telnet to port 8888, but when I issue ^] close, the program can't tell the connection has been closed. Could someone help?

Thanks in advance,

Juan Herrera

解决方案

Following link contains some ideas which might help you

http://social.msdn.microsoft.com/Forums/en-US/ncl/thread/f38884de-6ddc-48ea-9275-7b21087490cf

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