C#异步套接字实现是如何的呢?让我们开始从实例开始:
下面的C#异步套接字实现实例程序创建一个连接到服务器的客户端。该客户端是用C#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;
- }
- }
C#异步套接字在服务器的示例 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C#异步套接字生成的
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。
- using System;
- using System.Net;
- using System.Net.Sockets;
- using System.Text;
- using System.Threading;
- // State object for reading client data asynchronously
- public class StateObject {
- // Client socket.
- public Socket workSocket = null;
- // Size of receive buffer.
- public const int BufferSize = 1024;
- // Receive buffer.
- public byte[] buffer = new byte[BufferSize];
- // Received data string.
- public StringBuilder sb = new StringBuilder();
- }
- public class AsynchronousSocketListener {
- // Thread signal.
- public static ManualResetEvent allDone =
- new ManualResetEvent(false);
- public AsynchronousSocketListener() {
- }
- public static void StartListening() {
- // Data buffer for incoming data.
- byte[] bytes = new Byte[1024];
- // Establish the local endpoint for the socket.
- // The DNS name of the computer
- // running the listener is "host.contoso.com".
- 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(100);
- while (true) {
- // Set the event to nonsignaled state.
- allDone.Reset();
- // Start an asynchronous socket to listen for connections.
- Console.WriteLine("Waiting for a connection...");
- listener.BeginAccept(
- new AsyncCallback(AcceptCallback),
- listener );
- // Wait until a connection is made before continuing.
- allDone.WaitOne();
- }
- } catch (Exception e) {
- Console.WriteLine(e.ToString());
- }
- Console.WriteLine("\nPress ENTER to continue...");
- Console.Read();
- }
- public static void AcceptCallback(IAsyncResult ar) {
- // Signal the main thread to continue.
- allDone.Set();
- // Get the socket that handles the client request.
- Socket listener = (Socket) ar.AsyncState;
- Socket handler = listener.EndAccept(ar);
- // Create the state object.
- StateObject state = new StateObject();
- state.workSocket = handler;
- handler.BeginReceive( state.buffer,
- 0, StateObject.BufferSize, 0,
- new AsyncCallback(ReadCallback), state);
- }
- public static void ReadCallback(IAsyncResult ar) {
- String content = String.Empty;
- // Retrieve the state object and the handler socket
- // from the asynchronous state object.
- StateObject state = (StateObject) ar.AsyncState;
- Socket handler = state.workSocket;
- // Read data from the client socket.
- int bytesRead = handler.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));
- // Check for end-of-file tag. If it is not there, read
- // more data.
- content = state.sb.ToString();
- if (content.IndexOf("<EOF>") > -1) {
- // All the data has been read from the
- // client. Display it on the console.
- Console.WriteLine("Read {0} bytes from socket. \n Data : {1}",
- content.Length, content );
- // Echo the data back to the client.
- Send(handler, content);
- } else {
- // Not all data received. Get more.
- handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
- new AsyncCallback(ReadCallback), state);
- }
- }
- }
- private static void Send(Socket handler, 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.
- handler.BeginSend(byteData, 0, byteData.Length, 0,
- new AsyncCallback(SendCallback), handler);
- }
- private static void SendCallback(IAsyncResult ar) {
- try {
- // Retrieve the socket from the state object.
- Socket handler = (Socket) ar.AsyncState;
- // Complete sending the data to the remote device.
- int bytesSent = handler.EndSend(ar);
- Console.WriteLine("Sent {0} bytes to client.", bytesSent);
- handler.Shutdown(SocketShutdown.Both);
- handler.Close();
- } catch (Exception e) {
- Console.WriteLine(e.ToString());
- }
- }
- public static int Main(String[] args) {
- StartListening();
- return 0;
- }
- }
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