C#異步套接字實現(xiàn)淺析
C#異步套接字實現(xiàn)是如何的呢?讓我們開始從實例開始:
下面的C#異步套接字實現(xiàn)實例程序創(chuàng)建一個連接到服務(wù)器的客戶端。該客戶端是用C#異步套接字生成的,因此在等待服務(wù)器返回響應(yīng)時不掛起客戶端應(yīng)用程序的執(zhí)行。該應(yīng)用程序?qū)⒆址l(fā)送到服務(wù)器,然后在控制臺顯示該服務(wù)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#異步套接字在服務(wù)器的示例 下面的示例程序創(chuàng)建一個接收來自客戶端的連接請求的服務(wù)器。該服務(wù)器是用C#異步套接字生成的
因此在等待來自客戶端的連接時不掛起服務(wù)器應(yīng)用程序的執(zhí)行。該應(yīng)用程序接收來自客戶端的字符串
在控制臺顯示該字符串,然后將該字符串回顯到客戶端。來自客戶端的字符串必須包含字符串“<EOF>”
以發(fā)出表示消息結(jié)尾的信號。
- 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;
- }
- }
C#異步套接字的相關(guān)內(nèi)容就向你介紹到這里,希望對你了解和學(xué)習(xí)C#異步套接字有所幫助。
【編輯推薦】