C# Socket异步通讯实现详解

C# Socket异步通讯客户端实现源码

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:

private static void ConnectCallback(IAsyncResult ar)
{

// 从state对象获取socket.
Socket client = (Socket)ar.AsyncState;

// 完成连接.
client.EndConnect(ar);

Console.WriteLine("Socket connected to {0}",
client.RemoteEndPoint.ToString());

// 连接已完成，主线程继续.
connectDone.Set();
}

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：

private static void Send(Socket client, String data)
{
// 格式转换.
byte[] byteData = Encoding.ASCII.GetBytes(data);

// 开始发送数据到远程设备.
client.BeginSend(byteData, 0, byteData.Length, 0,
new AsyncCallback(SendCallback), client);
}

private static void SendCallback(IAsyncResult ar)
{

// 从state对象中获取socket
Socket client = (Socket)ar.AsyncState;

// 完成数据发送.
int bytesSent = client.EndSend(ar);
Console.WriteLine("Sent {0} bytes to server.", bytesSent);

// 指示数据已经发送完成，主线程继续.
sendDone.Set();

}