c#(Socket)异步套接字代码示例

r囧r小猫 2022-09-19 04:13 163阅读 0赞

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;  
/\*  
 \* 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。   
 \*/  
// 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;  
    \}

异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;  
    \}  
\}