C#实现 UDP简单广播

[csharp] view plaincopy print?

代码
Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--> class Program
{
static bool connecting = true;
static void Main()
{
Received();
while (connecting)
{
string content = Console.ReadLine();
if (content.Length > 0)
{
if (string.Compare(content, "<Stop>", true) == 0)
{
Console.WriteLine("关闭...");
connecting = false;
}
else
{
Send(content);
}
}
}
Console.ReadKey();
}
public static void Send(string content)
{
Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
//IPEndPoint iep1 = new IPEndPoint(IPAddress.Broadcast, 9050);//255.255.255.255
IPEndPoint iep2 = new IPEndPoint(IPAddress.Parse("192.168.100.255"), 9050);
// string hostname = Dns.GetHostName();
byte[] data = Encoding.ASCII.GetBytes(content);
sock.SetSocketOption(SocketOptionLevel.Socket,
SocketOptionName.Broadcast, 1);
//sock.SendTo(data, iep1);
sock.SendTo(data, iep2);
sock.Close();
}
public static void Received()
{
ThreadPool.QueueUserWorkItem((x) =>
{
Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
IPEndPoint iep = new IPEndPoint(IPAddress.Any, 9050);
sock.Bind(iep);
EndPoint ep = (EndPoint)iep;
byte[] data;
int recv;
string stringData;
Console.WriteLine("接听开启...");
while (connecting)
{
data = new byte[1024];
recv = sock.ReceiveFrom(data, ref ep);
stringData = Encoding.ASCII.GetString(data, 0, recv);
Console.WriteLine("信息: {0} 来自: {1}", stringData, ep.ToString());
}
Console.WriteLine("接听关闭...");
sock.Close();
});
}
}

代码Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->    class Program{static bool connecting = true;static void Main(){Received();while (connecting){string content = Console.ReadLine();if (content.Length > 0){if (string.Compare(content, "<Stop>", true) == 0){Console.WriteLine("关闭...");connecting = false;}else{Send(content);}}}Console.ReadKey();}public static void Send(string content){Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);//IPEndPoint iep1 = new IPEndPoint(IPAddress.Broadcast, 9050);//255.255.255.255 IPEndPoint iep2 = new IPEndPoint(IPAddress.Parse("192.168.100.255"), 9050);// string hostname = Dns.GetHostName();byte[] data = Encoding.ASCII.GetBytes(content);sock.SetSocketOption(SocketOptionLevel.Socket,SocketOptionName.Broadcast, 1);//sock.SendTo(data, iep1);sock.SendTo(data, iep2);sock.Close();}public static void Received(){ThreadPool.QueueUserWorkItem((x) =>{Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);IPEndPoint iep = new IPEndPoint(IPAddress.Any, 9050);sock.Bind(iep);EndPoint ep = (EndPoint)iep;byte[] data;int recv;string stringData;Console.WriteLine("接听开启...");while (connecting){data = new byte[1024];recv = sock.ReceiveFrom(data, ref ep);stringData = Encoding.ASCII.GetString(data, 0, recv);Console.WriteLine("信息: {0} 来自: {1}", stringData, ep.ToString());}Console.WriteLine("接听关闭...");sock.Close();});}}

从原理角度考虑，广播和单向定点发送没什么区别，献上一段小代码（来自msdn），基本很详细的说了如何广播式发送udp数据包：

[csharp] view plaincopy print?

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
public class UDPMulticastSender {
private static IPAddress GroupAddress =
IPAddress.Parse("224.168.100.2");
private static int GroupPort = 11000;
private static void Send( String message) {
UdpClient sender = new UdpClient();
IPEndPoint groupEP = new IPEndPoint(GroupAddress,GroupPort);
try {
Console.WriteLine("Sending datagram : {0}", message);
byte[] bytes = Encoding.ASCII.GetBytes(message);
sender.Send(bytes, bytes.Length, groupEP);
sender.Close();
} catch (Exception e) {
Console.WriteLine(e.ToString());
}
}
public static int Main(String[] args) {
Send(args[0]);
return 0;
}

using   System;   using   System.Net;   using   System.Net.Sockets;   using   System.Text;   public   class   UDPMulticastSender   {   private   static   IPAddress   GroupAddress   =     IPAddress.Parse("224.168.100.2");   private   static   int   GroupPort   =   11000;   private   static   void   Send(   String   message)   {   UdpClient   sender   =   new   UdpClient();   IPEndPoint   groupEP   =   new   IPEndPoint(GroupAddress,GroupPort);   try   {   Console.WriteLine("Sending   datagram   :   {0}",   message);   byte[]   bytes   =   Encoding.ASCII.GetBytes(message);   sender.Send(bytes,   bytes.Length,   groupEP);   sender.Close();   }   catch   (Exception   e)   {   Console.WriteLine(e.ToString());   }   }   public   static   int   Main(String[]   args)   {   Send(args[0]);   return   0;   }

单播(点对点) 通信，即网络中单一的源节点发送封包到单一的上的节点。

在广播通信中，网络层提供了将封包从一个节点发送到所有其他节点的服务。

利用广播(broadcast) 可以将数据发送给本地子网上的每个机器。广播的缺点是如果多个进程都发送广播数据，网络就会阻塞。

1. 服务端

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using System;
using System.Collections.Generic;
using System.Text;
using System.Net.Sockets;
using System.Net;
using System.Threading;
namespace _5._2_广播通信
{
class Program
{
static void Main(string[] args)
{
Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
s.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, true);
byte[] buffer = Encoding.Unicode.GetBytes("Hello World");
IPEndPoint iep1 = new IPEndPoint(IPAddress.Broadcast, 4567);//255.255.255.255
int i = 0;
while (true)
{
Console.WriteLine("正在进行广播 {0}", i++.ToString());
s.SendTo(buffer, iep1);
Thread.Sleep(5000);
}
}
}
}

using System;
using System.Collections.Generic;
using System.Text;
using System.Net.Sockets;
using System.Net;
using System.Threading;namespace _5._2_广播通信
{class Program{static void Main(string[] args){Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);s.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, true);byte[] buffer = Encoding.Unicode.GetBytes("Hello World");IPEndPoint iep1 = new IPEndPoint(IPAddress.Broadcast, 4567);//255.255.255.255int i = 0;while (true){Console.WriteLine("正在进行广播 {0}", i++.ToString());s.SendTo(buffer, iep1);Thread.Sleep(5000);}}}
}

对于UPD来说，存在一个特定的广播地址 - 255.255.255.255，广播数据都应该发送到这里。

广播消息的目的IP地址是一种特殊IP地址，称为广播地址。

广播地址由IP地址网络前缀加上全1主机后缀组成，如：192.168.1.255是 192.169.1.0 这个网络的广播地址;

130.168.255.255 是130.168.0.0 这个网络的广播地址。

向全部为1的IP地址（255.255.255.255）发送消息的话，那么理论上全世界所有的联网的计算机都能收得到了。

但实际上不是这样的，一般路由器上设置抛弃这样的包，只在本地网内广播，所以效果和向本地网的广播地址发送消息是一样的。

进行广播通信，必须打开广播选项 SO_BROADCAST

2. 客户端

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using System;
using System.Collections.Generic;
using System.Text;
using System.Net.Sockets;
using System.Net;
namespace Client
{
class Program
{
static void Main(string[] args)
{
Socket m_s = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
IPEndPoint iep = new IPEndPoint(IPAddress.Any, 4567);
EndPoint ep = (EndPoint)iep;
m_s.Bind(iep);
byte[] buffer = new byte[1204];
while (true)
{
int revc = m_s.ReceiveFrom(buffer, ref ep);
if (revc > 0)
{
string data = Encoding.Unicode.GetString(buffer, 0, revc);
Console.WriteLine(data);
}
}
}
}
}

using System;
using System.Collections.Generic;
using System.Text;
using System.Net.Sockets;
using System.Net;namespace Client
{
class Program{
static void Main(string[] args){Socket m_s = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);IPEndPoint iep = new IPEndPoint(IPAddress.Any, 4567);EndPoint ep = (EndPoint)iep;m_s.Bind(iep);byte[] buffer = new byte[1204];
while (true){
int revc = m_s.ReceiveFrom(buffer, ref ep);
if (revc > 0){
string data = Encoding.Unicode.GetString(buffer, 0, revc);Console.WriteLine(data);}}}}
}

3. 效果

C#实现局域网UDP广播,这一块设置到局域网，需要用到的主要命名空间是:System.NET和System.Net.Scoket:

接收端:

Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);//初始化一个Scoket协议

IPEndPoint iep = new IPEndPoint(IPAddress.Any, 9095);//初始化一个侦听局域网内部所有IP和指定端口

EndPoint ep = (EndPoint)iep;

socket.Bind(iep);//绑定这个实例

            while (true)
                   {
               byte[] buffer = new byte[1024];//设置缓冲数据流

socket.ReceiveFrom(buffer, ref ep);//接收数据,并确把数据设置到缓冲流里面

Console.WriteLine(Encoding.Unicode.GetString(buffer2).TrimEnd('/u0000') + " " + DateTime.Now.ToString());

}

发送端:

Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);//初始化一个Scoket实习,采用UDP传输

IPEndPoint iep = new IPEndPoint(IPAddress.Broadcast, 9095);//初始化一个发送广播和指定端口的网络端口实例

sock.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, 1);//设置该scoket实例的发送形式

string request = "你好,TEST SEND!";//初始化需要发送而的发送数据

byte[] buffer = Encoding.Unicode.GetBytes(request);

sock.SendTo(buffer, iep);

sock.Close();

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