同步客户端套接字示例

下面的示例程序创建一个连接到服务器的客户端。该客户端是用同步套接字生成的，因此挂起客户端应用程序的执行，直到服务器返回响应为止。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。

 [C#]

using System;

using System.Net;

using System.Net.Sockets;

using System.Text;

public class SynchronousSocketClient {

  public static void StartClient() {

    // Data buffer for incoming data.

    byte[] bytes = new byte[1024];

    // 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,11000);

      // Create a TCP/IP  socket.

      Socket sender = new Socket(AddressFamily.InterNetwork, 

        SocketType.Stream, ProtocolType.Tcp );

      // Connect the socket to the remote endpoint. Catch any errors.

      try {

        sender.Connect(remoteEP);

        Console.WriteLine("Socket connected to {0}",

          sender.RemoteEndPoint.ToString());

        // Encode the data string into a byte array.

        byte[] msg = Encoding.ASCII.GetBytes("This is a test<EOF>");

        // Send the data through the  socket.

        int bytesSent = sender.Send(msg);

        // Receive the response from the remote device.

        int bytesRec = sender.Receive(bytes);

        Console.WriteLine("Echoed test = {0}",

          Encoding.ASCII.GetString(bytes,0,bytesRec));

        // Release the socket.

        sender.Shutdown(SocketShutdown.Both);

        sender.Close();

      } catch (ArgumentNullException ane) {

        Console.WriteLine("ArgumentNullException : {0}",ane.ToString());

      } catch (SocketException se) {

        Console.WriteLine("SocketException : {0}",se.ToString());

      } catch (Exception e) {

        Console.WriteLine("Unexpected exception : {0}", e.ToString());

      }

    } catch (Exception e) {

      Console.WriteLine( e.ToString());