DotNet：Socket Server 异步套接字服务端实现

异步服务器套接字示例

From https://msdn.microsoft.com/zh-cn/library/fx6588te(v=vs.110).aspx

下面的示例程序创建接收来自客户端的连接请求的服务器。服务器以异步套接字生成，因此，服务器应用程序的执行不会挂起，它在等待从客户端时的连接。应用程序收到来自客户端的字符串，在控制台上显示字符串，然后回显该字符串返回给客户端。从客户端的字符串必须包含字符串“”用于通知消息的结尾。

C#

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;

    }

}

巴特西

DotNet：Socket Server 异步套接字服务端实现

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