ex-21-13

Programming Csharp Source Code(代码) Programming Csharp Source Code

//Example 21-13: Implementing a client for an asynchronous network file server

using System;
using System.Net.Sockets;
using System.Threading;
using System.Text;
using System.Runtime.Serialization.Formatters.Binary;

public class AsynchNetworkClient
{

   static public int Main()
   {

      AsynchNetworkClient client = 
         new AsynchNetworkClient();
      return client.Run();
   }

   AsynchNetworkClient()
   {
      string serverName = "localhost";
      Console.WriteLine("Connecting to {0}", serverName);
      TcpClient tcpSocket = new TcpClient(serverName, 65000);
      streamToServer = tcpSocket.GetStream();
   }

   private int Run()
   {
      string message = @"C:\test\source\AskTim.txt";
      Console.Write(
         "Sending {0} to server.", message);

      // create a streamWriter and use it to
      // write a string to the server
      System.IO.StreamWriter writer = 
         new System.IO.StreamWriter(streamToServer);
      writer.Write(message);
      writer.Flush();

      bool fQuit = false;

      // while there is data coming
      // from the server, keep reading
      while (!fQuit)
      {
         // buffer to hold the response
         char[] buffer = new char[BufferSize];

         // Read response
         System.IO.StreamReader reader = 
            new System.IO.StreamReader(streamToServer);

         // see how many bytes are 
         // retrieved to the buffer
         int bytesRead = 
            reader.Read(buffer,0,BufferSize);
         if (bytesRead == 0)  // none? quite
            fQuit = true;
         else                 // got some?
         {
            // display it as a string
            string theString = new String(buffer);
            Console.WriteLine(theString);
         }
      }
      streamToServer.Close(); // tidy up
      return 0;

   }

   private const int BufferSize = 256;
   private NetworkStream   streamToServer;
}