[置顶] 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. }