C# Socket异步通讯实现详解

C# Socket异步通讯客户端之主程序：

# public static int Main(String[] args)  
# {  
#  
# IPAddress ipAddress = IPAddress.Parse("192.168.1.104");  
# int port = 20000;  
# IPEndPoint remoteEP = new IPEndPoint(ipAddress, port);  
#  
# // 生成一个TCP/IP socket.  
# Socket client = new Socket(AddressFamily.InterNetwork,  
# SocketType.Stream, ProtocolType.Tcp);  
#  
# // 与目标终端连接.  
# client.BeginConnect(remoteEP,  
# new AsyncCallback(ConnectCallback), client);  
# //等待，直到连接程序完成。在ConnectCallback中适当位置有connecDone.Set()语句  
# connectDone.WaitOne();  
#  
# // 发送数据到远程终端.  
# Send(client, "This is a test<EOF>");  
# sendDone.WaitOne();  
#  
# // 接收返回数据.  
# 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();  
#  
# return 0;  
#  

C# Socket异步通讯客户端之连接部分Callback:

   1. private static void ConnectCallback(IAsyncResult ar)  
   2. {  
   3.  
   4. // 从state对象获取socket.  
   5. Socket client = (Socket)ar.AsyncState;  
   6.  
   7. // 完成连接.  
   8. client.EndConnect(ar);  
   9.  
  10. Console.WriteLine("Socket connected to {0}",  
  11. client.RemoteEndPoint.ToString());  
  12.  
  13. // 连接已完成，主线程继续.  
  14. connectDone.Set();  
  15. } 

C# Socket异步通讯客户端之数据接收：

# private static void Receive(Socket client)  
# {  
#  
# // 构造容器state.  
# StateObject state = new StateObject();  
# state.workSocket = client;  
#  
# // 从远程目标接收数据.  
# client.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,  
# new AsyncCallback(ReceiveCallback), state);  
#     
# }  
#  
# private static void ReceiveCallback(IAsyncResult ar)  
# {  
#  
# // 从输入参数异步state对象中获取state和socket对象  
# StateObject state = (StateObject)ar.AsyncState;  
# Socket client = state.workSocket;  
#  
# //从远程设备读取数据  
# int bytesRead = client.EndReceive(ar);  
#  
# if (bytesRead > 0)  
# {  
# // 有数据，存储.  
# state.sb.Append(Encoding.ASCII.GetString(state.buffer, 0, bytesRead));  
#  
# // 继续读取.  
# client.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,  
# new AsyncCallback(ReceiveCallback), state);  
# }  
# else 
# {  
# // 所有数据读取完毕.  
# if (state.sb.Length > 1)  
# {  
# response = state.sb.ToString();  
# }  
# // 所有数据读取完毕的指示信号.  
# receiveDone.Set();  
# }  
#  
# } 

C# Socket异步通讯客户端之发送数据：

   1. private static void Send(Socket client, String data)  
   2. {  
   3. // 格式转换.  
   4. byte[] byteData = Encoding.ASCII.GetBytes(data);  
   5.  
   6. // 开始发送数据到远程设备.  
   7. client.BeginSend(byteData, 0, byteData.Length, 0,  
   8. new AsyncCallback(SendCallback), client);  
   9. }  
  10.  
  11. private static void SendCallback(IAsyncResult ar)  
  12. {  
  13.  
  14. // 从state对象中获取socket  
  15. Socket client = (Socket)ar.AsyncState;  
  16.  
  17. // 完成数据发送.  
  18. int bytesSent = client.EndSend(ar);  
  19. Console.WriteLine("Sent {0} bytes to server.", bytesSent);  
  20.  
  21. // 指示数据已经发送完成，主线程继续.  
  22. sendDone.Set();  
  23.  
  24. }