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C# Socket异步通讯客户端之主程序：
using System;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.Text;
// State object for receiving data from remote device.
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);// 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
"); 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();
} catch (Exception e) {
Console.WriteLine(e.ToString());
}
}
C# Socket异步通讯客户端之数据接收：
private static void Receive(Socket client)
try {{
// 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);
} catch (Exception e) {
Console.WriteLine(e.ToString());
}
}
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();
}
} catch (Exception e) {
Console.WriteLine(e.ToString());
}
}
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();
}
} catch (Exception e) {
Console.WriteLine(e.ToString());
}
}
public static int Main(String[] args) {
StartClient();
return 0;
}
}
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