C# Socket异步通信

C#Socket异步通信TCPServer1、使用的通讯通道:socket2、用到的基本功能:Bind,Listen,BeginAcceptEndAcceptBeginReceiveEndR
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C# Socket异步通信 

                                                                     

TCPServer 

1、使用的通讯通道:socket

2、用到的基本功能:

Bind,

Listen,

BeginAccept

EndAccept

BeginReceive 

EndReceive

3、函数参数说明

 Socket listener = new Socket(AddressFamily.InterNetwork,

            SocketType.Stream, ProtocolType.Tcp);

 新建socket所使用的参数均为系统预定义的量,直接选取使用。

listener.Bind(localEndPoint);

localEndPoint 表示一个定义完整的终端,包括IP和端口信息。

//new IPEndPoint(IPAddress,port)

//IPAdress.Parse("192.168.1.3")

listener.Listen(100);

监听

    listener.BeginAccept(

                    new AsyncCallback(AcceptCallback),

                    listener);

  AsyncCallback(AcceptCallback),一旦连接上后的回调函数为AcceptCallback。当系统调用这个函数时,自动赋予的输入参数为IAsyncResoult类型变量ar。

   listener,连接行为的容器。

Socket handler = listener.EndAccept(ar);

完成连接,返回此时的socket通道。

handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,

            new AsyncCallback(ReadCallback), state);

接收的字节,0,字节长度,0,接收时调用的回调函数,接收行为的容器。

========

容器的结构类型为:

Code

  
  
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();
}

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容器至少为一个socket类型。

===============

  // Read data from the client socket.

        int bytesRead = handler.EndReceive(ar);

完成一次连接。数据存储在state.buffer里,bytesRead为读取的长度。

handler.BeginSend(byteData, 0, byteData.Length, 0,

            new AsyncCallback(SendCallback), handler);

发送数据byteData,回调函数SendCallback。容器handler

int bytesSent = handler.EndSend(ar);

发送完毕,bytesSent发送字节数。

4 程序结构

主程序:

Code

此代码由Java架构师必看网-架构君整理
byte [] bytes = new Byte[ 1024 ];
IPAddress ipAddress
= IPAddress.Parse( " 192.168.1.104 " );
IPEndPoint localEndPoint
= new IPEndPoint(ipAddress, 11000 );

// 生成一个TCP的socket
Socket listener = new Socket(AddressFamily.InterNetwork,
SocketType.Stream, ProtocolType.Tcp);

listener.Bind(localEndPoint);
listener.Listen(
100 );

while ( true )
{

// Set the event to nonsignaled state.
allDone.Reset();

// 开启异步监听socket
Console.WriteLine( " Waiting for a connection " );
listener.BeginAccept(
new AsyncCallback(AcceptCallback),
listener);

// 让程序等待,直到连接任务完成。在AcceptCallback里的适当位置放置allDone.Set()语句.
allDone.WaitOne();
}

Console.WriteLine(
" \nPress ENTER to continue " );
Console.Read();

 连接行为回调函数AcceptCallback:

Code

    public static void AcceptCallback(IAsyncResult ar)

    {

        //添加此命令,让主线程继续.

        allDone.Set();

        // 获取客户请求的socket

        Socket listener = (Socket)ar.AsyncState;

        Socket handler = listener.EndAccept(ar);

        // 造一个容器,并用于接收命令.

        StateObject state = new StateObject();

        state.workSocket = handler;

        handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,

            new AsyncCallback(ReadCallback), state);

    }

读取行为的回调函数ReadCallback:

Code

    public static void ReadCallback(IAsyncResult ar)

    {

        String content = String.Empty;

        // 从异步state对象中获取state和socket对象.

        StateObject state = (StateObject)ar.AsyncState;

        Socket handler = state.workSocket;

        // 从客户socket读取数据.

        int bytesRead = handler.EndReceive(ar);

        if (bytesRead > 0)

        {

            // 如果接收到数据,则存起来

            state.sb.Append(Encoding.ASCII.GetString(state.buffer, 0, bytesRead));

            // 检查是否有结束标记,如果没有则继续读取

            content = state.sb.ToString();

            if (content.IndexOf("<EOF>") > -1)

            {

                //所有数据读取完毕.

                Console.WriteLine("Read {0} bytes from socket. \n Data : {1}",

                    content.Length, content);

                // 给客户端响应.

                Send(handler, content);

            }

            else

            {

                // 接收未完成,继续接收.

                handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,

                new AsyncCallback(ReadCallback), state);

            }

        }

    }

发送消息给客户端:

Code

private static void Send(Socket handler, String data)

    {

        // 消息格式转换.

        byte[] byteData = Encoding.ASCII.GetBytes(data);

        // 开始发送数据给远程目标.

        handler.BeginSend(byteData, 0, byteData.Length, 0,

            new AsyncCallback(SendCallback), handler);

    }

private static void SendCallback(IAsyncResult ar)

    {

    

            // 从state对象获取socket.

            Socket handler = (Socket)ar.AsyncState;

            //完成数据发送

            int bytesSent = handler.EndSend(ar);

            Console.WriteLine("Sent {0} bytes to client.", bytesSent);

            handler.Shutdown(SocketShutdown.Both);

            handler.Close();

    }

在各种行为的回调函数中,所对应的socket都从输入参数的AsyncState属性获得。使用(Socket)或者(StateObject)进行强制转换。BeginReceive函数使用的容器为state,因为它需要存放传送的数据。

而其余接收或发送函数的容器为socket也可。

完整代码

  
  
1 using System;
2   using System.Net;
3   using System.Net.Sockets;
4 using System.Text;
5 using System.Threading;
6
7 // State object for reading client data asynchronously
8 public class StateObject
9 {
10 // Client socket.
11 public Socket workSocket = null ;
12 // Size of receive buffer.
13 public const int BufferSize = 1024 ;
14 // Receive buffer.
15 public byte [] buffer = new byte [BufferSize];
16 // Received data string.
17 public StringBuilder sb = new StringBuilder();
18 }
19
20 public class AsynchronousSocketListener
21 {
22 // Thread signal.
23 public static ManualResetEvent allDone = new ManualResetEvent( false );
24
25 public AsynchronousSocketListener()
26 {
27 }
28
29 public static void StartListening()
30 {
31 // Data buffer for incoming data.
32 byte [] bytes = new Byte[ 1024 ];
33
34 // Establish the local endpoint for the socket.
35 // The DNS name of the computer
36 // running the listener is "host.contoso.com".
37 // IPHostEntry ipHostInfo = Dns.Resolve(Dns.GetHostName());
38 IPAddress ipAddress = IPAddress.Parse( " 192.168.1.104 " );
39
40 IPEndPoint localEndPoint = new IPEndPoint(ipAddress, 11000 );
41
42 // Create a TCP/IP socket.
43 Socket listener = new Socket(AddressFamily.InterNetwork,
44 SocketType.Stream, ProtocolType.Tcp);
45
46 // Bind the socket to the local endpoint and listen for incoming connections.
47 try
48 {
49 listener.Bind(localEndPoint);
50 listener.Listen( 100 );
51 while ( true )
52 {
53 // Set the event to nonsignaled state.
54 allDone.Reset();
55
56 // Start an asynchronous socket to listen for connections.
57 Console.WriteLine( " Waiting for a connection " );
58 listener.BeginAccept(
59 new AsyncCallback(AcceptCallback),
60 listener);
61
62 // Wait until a connection is made before continuing.
63 allDone.WaitOne();
64 }
65 }
66 catch (Exception e)
67 {
68 Console.WriteLine(e.ToString());
69 }
70
71 Console.WriteLine( " \nPress ENTER to continue " );
72 Console.Read();
73 }
74
75 public static void AcceptCallback(IAsyncResult ar)
76 {
77 // Signal the main thread to continue.
78 allDone.Set();
79
80 // Get the socket that handles the client request.
81 Socket listener = (Socket)ar.AsyncState;
82 Socket handler = listener.EndAccept(ar);
83
84 // Create the state object.
85 StateObject state = new StateObject();
86 state.workSocket = handler;
87 handler.BeginReceive(state.buffer, 0 , StateObject.BufferSize, 0 , new AsyncCallback(ReadCallback), state);
88 }
89
90 public static void ReadCallback(IAsyncResult ar)
91 {
92 String content = String.Empty;
93
94 // Retrieve the state object and the handler socket
95 // from the asynchronous state object.
96 StateObject state = (StateObject)ar.AsyncState;
97 Socket handler = state.workSocket;
98
99 // Read data from the client socket.
100 int bytesRead = handler.EndReceive(ar);
101
102 if (bytesRead > 0 )
103 {
104 // There might be more data, so store the data received so far.
105 state.sb.Append(Encoding.ASCII.GetString(
106 state.buffer, 0 , bytesRead));
107
108 // Check for end-of-file tag. If it is not there, read
109 // more data.
110 content = state.sb.ToString();
111 if (content.IndexOf( " <EOF> " ) > - 1 )
112 {
113 // All the data has been read from the
114 // client. Display it on the console.
115 Console.WriteLine( " Read {0} bytes from socket. \n Data : {1} " ,content.Length, content);
116
117 // Echo the data back to the client.
118 Send(handler, content);
119 }
120 else
121 {
122 // Not all data received. Get more.
123 handler.BeginReceive(state.buffer, 0 , StateObject.BufferSize, 0 , new AsyncCallback(ReadCallback), state);
124 }
125 }
126 }
127
128 private static void Send(Socket handler, String data)
129 {
130 // Convert the string data to byte data using ASCII encoding.
131 byte [] byteData = Encoding.ASCII.GetBytes(data);
132
133 // Begin sending the data to the remote device.
134 handler.BeginSend(byteData, 0 , byteData.Length, 0 ,
135 new AsyncCallback(SendCallback), handler);
136 }
137
138
139
140 private static void SendCallback(IAsyncResult ar)
141
142 {
143 try
144 {
145 // Retrieve the socket from the state object.
146 Socket handler = (Socket)ar.AsyncState;
147
148 // Complete sending the data to the remote device.
149 int bytesSent = handler.EndSend(ar);
150 Console.WriteLine( " Sent {0} bytes to client. " , bytesSent);
151 handler.Shutdown(SocketShutdown.Both);
152 handler.Close();
153 }
154
155 catch (Exception e)
156
157 {
158 Console.WriteLine(e.ToString());
159 }
160 }
161
162 public static int Main(String[] args)
163
164 {
165 StartListening();
166 return 0 ;
167 }
168
169 }
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