学步园

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。

using System;<br /> using System.Net;<br /> using System.Net.Sockets;<br /> using System.Text;</p> <p>public class SynchronousSocketClient {</p> <p> public static void StartClient() {<br /> // Data buffer for incoming data.<br /> byte[] bytes = new byte[1024];</p> <p> // Connect to a remote device.<br /> try {<br /> // Establish the remote endpoint for the socket.<br /> // This example uses port 11000 on the local computer.<br /> IPHostEntry ipHostInfo = Dns.Resolve(Dns.GetHostName())<br /> IPAddress ipAddress = ipHostInfo.AddressList[0];<br /> IPEndPoint remoteEP = new IPEndPoint(ipAddress,11000);</p> <p> // Create a TCP/IP socket.<br /> Socket sender = new Socket(AddressFamily.InterNetwork,<br /> SocketType.Stream, ProtocolType.Tcp );</p> <p> // Connect the socket to the remote endpoint. Catch any errors.<br /> try {<br /> sender.Connect(remoteEP);</p> <p> Console.WriteLine("Socket connected to {0}",<br /> sender.RemoteEndPoint.ToString());</p> <p> // Encode the data string into a byte array.<br /> byte[] msg = Encoding.ASCII.GetBytes("This is a test<EOF>");</p> <p> // Send the data through the socket.<br /> int bytesSent = sender.Send(msg);</p> <p> // Receive the response from the remote device.<br /> int bytesRec = sender.Receive(bytes);<br /> Console.WriteLine("Echoed test = {0}",<br /> Encoding.ASCII.GetString(bytes,0,bytesRec));</p> <p> // Release the socket.<br /> sender.Shutdown(SocketShutdown.Both);<br /> sender.Close();</p> <p> } catch (ArgumentNullException ane) {<br /> Console.WriteLine("ArgumentNullException : {0}",ane.ToString());<br /> } catch (SocketException se) {<br /> Console.WriteLine("SocketException : {0}",se.ToString());<br /> } catch (Exception e) {<br /> Console.WriteLine("Unexpected exception : {0}", e.ToString());<br /> }</p> <p> } catch (Exception e) {<br /> Console.WriteLine( e.ToString());<br /> }<br /> }</p> <p> public static int Main(String[] args) {<br /> StartClient();<br /> return 0;<br /> }<br /> }