基于C#的UDP协议的异步实现

[b]一、摘要[/b]

[b]二、实验平台[/b]

[b]三、实验实例[/b]

using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.Threading;
namespace AsyncServer
{
// 定义 UdpState类
public class UdpState
{
public UdpClient udpClient;
public IPEndPoint ipEndPoint;
public const int BufferSize = 1024;
public byte[] buffer = new byte[BufferSize];
public int counter = 0;
}
// 异步UDP类
public class AsyncUdpSever
{
// 定义节点
private IPEndPoint ipEndPoint = null;
private IPEndPoint remoteEP = null;
// 定义UDP发送和接收
private UdpClient udpReceive = null;
private UdpClient udpSend = null;
// 定义端口
private const int listenPort = 1100;
private const int remotePort = 1101;
UdpState udpReceiveState = null;
UdpState udpSendState = null;
// 异步状态同步
private ManualResetEvent sendDone = new ManualResetEvent(false);
private ManualResetEvent receiveDone = new ManualResetEvent(false);
public AsyncUdpSever()
{
// 本机节点
ipEndPoint = new IPEndPoint(IPAddress.Any, listenPort);
// 远程节点
remoteEP = new IPEndPoint(Dns.GetHostAddresses(Dns.GetHostName())[0], remotePort);
// 实例化
udpReceive = new UdpClient(ipEndPoint);
udpSend = new UdpClient();

// 分别实例化udpSendState、udpReceiveState
udpReceiveState = new UdpState();
udpReceiveState.udpClient = udpReceive;
udpReceiveState.ipEndPoint = ipEndPoint;

udpSendState = new UdpState();
udpSendState.udpClient = udpSend;
udpSendState.ipEndPoint = remoteEP;
}
public void ReceiveMsg()
{
Console.WriteLine("listening for messages");
while (true)
{
lock (this)
{
// 调用接收回调函数
IAsyncResult iar = udpReceive.BeginReceive(new AsyncCallback(ReceiveCallback), udpReceiveState);
receiveDone.WaitOne();
Thread.Sleep(100);
}
}
}
// 接收回调函数
private void ReceiveCallback(IAsyncResult iar)
{
UdpState udpReceiveState = iar.AsyncState as UdpState;
if (iar.IsCompleted)
{
Byte[] receiveBytes = udpReceiveState.udpClient.EndReceive(iar, ref udpReceiveState.ipEndPoint);
string receiveString = Encoding.ASCII.GetString(receiveBytes);
Console.WriteLine("Received: {0}", receiveString);
//Thread.Sleep(100);
receiveDone.Set();
SendMsg();
}
}
// 发送函数
private void SendMsg()
{
udpSend.Connect(udpSendState.ipEndPoint);
udpSendState.udpClient = udpSend;
udpSendState.counter++;

string message = string.Format("第{0}个UDP请求处理完成！", udpSendState.counter);
Byte[] sendBytes = Encoding.Unicode.GetBytes(message);
udpSend.BeginSend(sendBytes, sendBytes.Length, new AsyncCallback(SendCallback), udpSendState);
sendDone.WaitOne();
}
// 发送回调函数
private void SendCallback(IAsyncResult iar)
{
UdpState udpState = iar.AsyncState as UdpState;
Console.WriteLine("第{0}个请求处理完毕！", udpState.counter);
Console.WriteLine("number of bytes sent: {0}", udpState.udpClient.EndSend(iar));
sendDone.Set();
}
// 主函数
public static void Main()
{
AsyncUdpSever aus = new AsyncUdpSever();
Thread t = new Thread(new ThreadStart(aus.ReceiveMsg));
t.Start();
Console.Read();
}
}
}

using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.Threading;
namespace AsyncClient
{
// 定义 UdpState类
public class UdpState
{
public UdpClient udpClient = null;
public IPEndPoint ipEndPoint = null;
public const int BufferSize = 1024;
public byte[] buffer = new byte[BufferSize];
public int counter = 0;
}
// 异步UDP类
public class AsyncUdpClient
{
public static bool messageSent = false;
// Receive a message and write it to the console.
// 定义端口
private const int listenPort = 1101;
private const int remotePort = 1100;
// 定义节点
private IPEndPoint localEP = null;
private IPEndPoint remoteEP = null;
// 定义UDP发送和接收
private UdpClient udpReceive = null;
private UdpClient udpSend = null;
private UdpState udpSendState = null;
private UdpState udpReceiveState = null;
private int counter = 0;
// 异步状态同步
private ManualResetEvent sendDone = new ManualResetEvent(false);
private ManualResetEvent receiveDone = new ManualResetEvent(false);
// 定义套接字
//private Socket receiveSocket;
//private Socket sendSocket;

public AsyncUdpClient()
{
// 本机节点
localEP = new IPEndPoint(IPAddress.Any, listenPort);
// 远程节点
remoteEP = new IPEndPoint(Dns.GetHostAddresses(Dns.GetHostName())[0], remotePort);
// 实例化
udpReceive = new UdpClient(localEP);
udpSend = new UdpClient();

// 分别实例化udpSendState、udpReceiveState
udpSendState = new UdpState();
udpSendState.ipEndPoint = remoteEP;
udpSendState.udpClient = udpSend;

udpReceiveState = new UdpState();
udpReceiveState.ipEndPoint = remoteEP;
udpReceiveState.udpClient = udpReceive;

//receiveSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
//receiveSocket.Bind(localEP);

//sendSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
//sendSocket.Bind(remoteEP);
}
// 发送函数
public void SendMsg()
{
udpSend.Connect(remoteEP);

//Thread t = new Thread(new ThreadStart(ReceiveMessages));
//t.Start();
Byte[] sendBytes;
string message;
while (true)
{
message = "Client" + (counter++).ToString();
lock (this)
{
sendBytes = Encoding.ASCII.GetBytes(message);
udpSendState.counter = counter;
// 调用发送回调函数
udpSend.BeginSend(sendBytes, sendBytes.Length, new AsyncCallback(SendCallback), udpSendState);
sendDone.WaitOne();
Thread.Sleep(200);
ReceiveMessages();
}
}
}

// 发送回调函数
public void SendCallback(IAsyncResult iar)
{
UdpState udpState = iar.AsyncState as UdpState;
if (iar.IsCompleted)
{
Console.WriteLine("第{0}个发送完毕！", udpState.counter);
Console.WriteLine("number of bytes sent: {0}", udpState.udpClient.EndSend(iar));
//if (udpState.counter == 10)
//{
//    udpState.udpClient.Close();
//}
sendDone.Set();
}
}

// 接收函数
public void ReceiveMessages()
{
lock (this)
{
udpReceive.BeginReceive(new AsyncCallback(ReceiveCallback), udpReceiveState);
receiveDone.WaitOne();
Thread.Sleep(100);
}
}

// 接收回调函数
public void ReceiveCallback(IAsyncResult iar)
{
UdpState udpState = iar.AsyncState as UdpState;
if (iar.IsCompleted)
{
Byte[] receiveBytes = udpState.udpClient.EndReceive(iar, ref udpReceiveState.ipEndPoint);
string receiveString = Encoding.Unicode.GetString(receiveBytes);
Console.WriteLine("Received: {0}", receiveString);
receiveDone.Set();
}
}

// 主函数
public static void Main()
{
AsyncUdpClient auc = new AsyncUdpClient();
auc.SendMsg();
Console.Read();
}
}
}

[b]四、总结[/b]