[转载]C# Socket编程 同步以及异步通信

 1 class Program
 2 
 3 {
 4 
 5     static void Main()
 6 
 7     {
 8 
 9         try{
10 
11             int port = 2000;
12 
13             string host = "127.0.0.1";
14 
15             IPAddress ip = IPAddress.Parse(host);
16 
17             IPEndPoint ipe = new IPEndPoint(ip, port);
18 
19             Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Stream,ProtocolType.Tcp);//创建一个Socket类
20 
21             s.Bind(ipe);//绑定2000端口
22 
23             s.Listen(0);//开始监听
24 
25             Console.WriteLine("Wait for connect");
26 
27             Socket temp = s.Accept();//为新建连接创建新的Socket。
28 
29             Console.WriteLine("Get a connect");
30 
31             string recvStr = "";
32 
33             byte[] recvBytes = new byte[1024];
34 
35             int bytes;
36 
37             bytes = temp.Receive(recvBytes, recvBytes.Length, 0);//从客户端接受信息
38 
39             recvStr += Encoding.ASCII.GetString(recvBytes, 0, bytes);
40 
41             Console.WriteLine("Server Get Message:{0}", recvStr);//把客户端传来的信息显示出来
42 
43             string sendStr = "Ok!Client Send Message Sucessful!";
44 
45             byte[] bs = Encoding.ASCII.GetBytes(sendStr);
46 
47             temp.Send(bs, bs.Length, 0);//返回客户端成功信息
48 
49             temp.Close();
50 
51             s.Close();
52 
53         }
54 
55         catch (ArgumentNullException e){
56 
57             Console.WriteLine("ArgumentNullException: {0}", e);}
58 
59         catch (SocketException e){
60 
61             Console.WriteLine("SocketException: {0}", e);}
62 
63         Console.WriteLine("Press Enter to Exit");
64 
65         Console.ReadLine();
66 
67     }
68 
69 }

 1 class Program
 2 
 3 {
 4 
 5     static void Main()
 6 
 7     {
 8 
 9         try{
10 
11             int port = 2000;
12 
13             string host = "127.0.0.1";
14 
15             IPAddress ip = IPAddress.Parse(host);
16 
17             IPEndPoint ipe = new IPEndPoint(ip, port);
18 
19             Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Stream,ProtocolType.Tcp);//创建一个Socket类
20 
21             s.Bind(ipe);//绑定2000端口
22 
23             s.Listen(0);//开始监听
24 
25             Console.WriteLine("Wait for connect");
26 
27             Socket temp = s.Accept();//为新建连接创建新的Socket。
28 
29             Console.WriteLine("Get a connect");
30 
31             string recvStr = "";
32 
33             byte[] recvBytes = new byte[1024];
34 
35             int bytes;
36 
37             bytes = temp.Receive(recvBytes, recvBytes.Length, 0);//从客户端接受信息
38 
39             recvStr += Encoding.ASCII.GetString(recvBytes, 0, bytes);
40 
41             Console.WriteLine("Server Get Message:{0}", recvStr);//把客户端传来的信息显示出来
42 
43             string sendStr = "Ok!Client Send Message Sucessful!";
44 
45             byte[] bs = Encoding.ASCII.GetBytes(sendStr);
46 
47             temp.Send(bs, bs.Length, 0);//返回客户端成功信息
48 
49             temp.Close();
50 
51             s.Close();
52 
53         }
54 
55         catch (ArgumentNullException e){
56 
57             Console.WriteLine("ArgumentNullException: {0}", e);}
58 
59         catch (SocketException e){
60 
61             Console.WriteLine("SocketException: {0}", e);}
62 
63         Console.WriteLine("Press Enter to Exit");
64 
65         Console.ReadLine();
66 
67     }
68 
69 }

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;

    }

}

服务器端Server：

预定义结构体，用于异步委托之间的传递。同客户端的一致。不再赘述

正文：

// State object for reading client data asynchronously

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());

        IPHostEntry ipHostInfo = Dns.Resolve("127.0.0.1");

        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,newAsyncCallback(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, "Server return :" + 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;

    }

}