关于c#的socket

Question

我也好想知道，如何得到这样的win消息

Answer 1

class MytcpClinet : TcpClient
{
  string recv()
  {
    if(Clinet.Poll(0,SelectRead))
    {
      //收数据。
     }
   }
}

Answer 2

.net下socket有异步方式可以使用如
下面的示例程序创建一个连接到服务器的客户端。该客户端是用异步套接字生成的，因此在等待服务器返回响应时不挂起客户端应用程序的执行。该应用程序将字符串发送到服务器，然后在控制台显示该服务器返回的字符串。
using System;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.Text;// State object for receiving data from remote device.
public class StateObject {
    // Client socket.
    public Socket workSocket = null;
    // Size of receive buffer.
    public const int BufferSize = 256;
    // Receive buffer.
    public byte[] buffer = new byte[BufferSize];
    // Received data string.
    public StringBuilder sb = new StringBuilder();
}public class AsynchronousClient {
    // The port number for the remote device.
    private const int port = 11000;    // ManualResetEvent instances signal completion.
    private static ManualResetEvent connectDone = 
        new ManualResetEvent(false);
    private static ManualResetEvent sendDone = 
        new ManualResetEvent(false);
    private static ManualResetEvent receiveDone = 
        new ManualResetEvent(false);    // The response from the remote device.
    private static String response = String.Empty;    private static void StartClient() {
        // Connect to a remote device.
        try {
            // Establish the remote endpoint for the socket.
            // The name of the 
            // remote device is "host.contoso.com".
            IPHostEntry ipHostInfo = Dns.Resolve("host.contoso.com");
            IPAddress ipAddress = ipHostInfo.AddressList[0];
            IPEndPoint remoteEP = new IPEndPoint(ipAddress, port);            // Create a TCP/IP socket.
            Socket client = new Socket(AddressFamily.InterNetwork,
                SocketType.Stream, ProtocolType.Tcp);            // Connect to the remote endpoint.
            client.BeginConnect( remoteEP, 
                new AsyncCallback(ConnectCallback), client);
            connectDone.WaitOne();            // Send test data to the remote device.
            Send(client,"This is a test<EOF>");
            sendDone.WaitOne();            // Receive the response from the remote device.
            Receive(client);
            receiveDone.WaitOne();            // Write the response to the console.
            Console.WriteLine("Response received : {0}", response);            // Release the socket.
            client.Shutdown(SocketShutdown.Both);
            client.Close();
            
        } catch (Exception e) {
            Console.WriteLine(e.ToString());
        }
    }    private static void ConnectCallback(IAsyncResult ar) {
        try {
            // Retrieve the socket from the state object.
            Socket client = (Socket) ar.AsyncState;            // Complete the connection.
            client.EndConnect(ar);            Console.WriteLine("Socket connected to {0}",
                client.RemoteEndPoint.ToString());            // Signal that the connection has been made.
            connectDone.Set();
        } catch (Exception e) {
            Console.WriteLine(e.ToString());
        }
    }    private static void Receive(Socket client) {
        try {
            // Create the state object.
            StateObject state = new StateObject();
            state.workSocket = client;            // Begin receiving the data from the remote device.
            client.BeginReceive( state.buffer, 0, StateObject.BufferSize, 0,
                new AsyncCallback(ReceiveCallback), state);
        } catch (Exception e) {
            Console.WriteLine(e.ToString());
        }
    }    private static void ReceiveCallback( IAsyncResult ar ) {
        try {
            // Retrieve the state object and the client socket 
            // from the asynchronous state object.
            StateObject state = (StateObject) ar.AsyncState;
            Socket client = state.workSocket;            // Read data from the remote device.
            int bytesRead = client.EndReceive(ar);            if (bytesRead > 0) {
                // There might be more data, so store the data received so far.
            state.sb.Append(Encoding.ASCII.GetString(state.buffer,0,bytesRead));                // Get the rest of the data.
                client.BeginReceive(state.buffer,0,StateObject.BufferSize,0,
                    new AsyncCallback(ReceiveCallback), state);
            } else {
                // All the data has arrived; put it in response.
                if (state.sb.Length > 1) {
                    response = state.sb.ToString();
                }
                // Signal that all bytes have been received.
                receiveDone.Set();
            }
        } catch (Exception e) {
            Console.WriteLine(e.ToString());
        }
    }    private static void Send(Socket client, String data) {
        // Convert the string data to byte data using ASCII encoding.
        byte[] byteData = Encoding.ASCII.GetBytes(data);        // Begin sending the data to the remote device.
        client.BeginSend(byteData, 0, byteData.Length, 0,
            new AsyncCallback(SendCallback), client);
    }    private static void SendCallback(IAsyncResult ar) {
        try {
            // Retrieve the socket from the state object.
            Socket client = (Socket) ar.AsyncState;            // Complete sending the data to the remote device.
            int bytesSent = client.EndSend(ar);
            Console.WriteLine("Sent {0} bytes to server.", bytesSent);            // Signal that all bytes have been sent.
            sendDone.Set();
        } catch (Exception e) {
            Console.WriteLine(e.ToString());
        }
    }
    
    public static int Main(String[] args) {
        StartClient();
        return 0;
    }
}

Answer 3

listener = new Socket(AddressFamily.InterNetwork, 
SocketType.Stream, ProtocolType.Tcp);
listener.Bind(new IPEndPoint(IPAddress.Parse(_ip), _port));
listener.Listen(10);
listener.BeginAccept(new AsyncCallback(ConnectRequest), listener);
……
private void ConnectRequest(object sender, MOLService.ConnectRequestEventArgs e)
{
  Socket client = e.Client; 
  client.BeginReceive(....);
}利用委托的异步回调，通过listener.BeginAccept(new AsyncCallback(ConnectRequest), listener);
来指定当有请求时由那个方法来处理（这里指定由ConnectRequest方法处理）

Answer 4

另开一个线程，Read 什么的是阻塞的，有了数据才继续运行，没有的话线程阻塞。

Answer 5

另开一个线程，Read 什么的是阻塞的，有了数据才继续运行，没有的话线程阻塞。
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
在连接数不多的情况下可以这么做，多了线程数就大多了，因为你还要开一个写的线程，
每个连接就要开二个线程。