使用.NET访问Internet(5) Paul_Ni（原作）

来源： 作者： 出处：巧巧读书 2006-09-12 进入讨论组

• 关 键 词：
• internet
• tcp/ip
• .net
• dns
• ssl

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());

    }

  }

  public static int Main(String[] args) {

    StartClient();

    return 0;

  }

}

同步服务器套接字示例

下面的示例程序创建一个接收来自客户端的连接请求的服务器。该服务器是用同步套接字生成的，因此在等待来自客户端的连接时不挂起服务器应用程序的执行。该应用程序接收来自客户端的字符串，在控制台显示该字符串，然后将该字符串回显到客户端。来自客户端的字符串必须包含字符串“<EOF>”，以发出表示消息结尾的信号。

 [C#]

using System;

using System.Net;

using System.Net.Sockets;

using System.Text;

public class SynchronousSocketListener {

  // Incoming data from the client.

  public static string data = null;

  public static void StartListening() {

    // Data buffer for incoming data.

    byte[] bytes = new Byte[1024];

    // Establish the local endpoint for the  socket.

    //  Dns.GetHostName returns the name of the 

    // host running the application.

    IPHostEntry ipHostInfo = Dns.Resolve(Dns.GetHostName());

    IPAddress ipAddress = ipHostInfo.AddressList[0];

    IPEndPoint localEndPoint = new IPEndPoint(ipAddress, 11000);

    // Create a TCP/IP socket.

    Socket listener = new Socket(AddressFamily.InterNetwork,

      SocketType.Stream, ProtocolType.Tcp );

    // Bind the socket to the local endpoint and 

    // listen for incoming connections.

    try {

      listener.Bind(localEndPoint);

      listener.Listen(10);

      // Start listening for connections.

      while (true) {

        Console.WriteLine("Waiting for a connection...");

        // Program is suspended while waiting for an incoming connection.

        Socket handler = listener.Accept();

        data = null;

        // An incoming connection needs to be processed.

        while (true) {

          bytes = new byte[1024];

          int bytesRec = handler.Receive(bytes);

          data += Encoding.ASCII.GetString(bytes,0,bytesRec);

          if (data.IndexOf("<EOF>") > -1) {

            break;

          }

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