Udp Client发送局域网广播消息

显示全部楼层 · 2012-12-5 16:12:54

new UdpClient(11000)就是用Udp方式侦听11000端口，侦听任何发送到11000端口的消息都会接收到。
<div class="blockcode"><blockquote>UdpClient udpClient = new UdpClient(11000);
try {
IPEndPoint RemoteIpEndPoint = new IPEndPoint(IPAddress.Any, 0);
Byte[] receiveBytes = udpClient.Receive(ref RemoteIpEndPoint);
string returnData = Encoding.ASCII.GetString(receiveBytes);
Console.WriteLine("This is the message you received " + returnData.ToString());
Console.WriteLine("This message was sent from " + RemoteIpEndPoint.Address.ToString() +
" on their port number " +
RemoteIpEndPoint.Port.ToString());
udpClient.Close();
}
catch (Exception e) {
Console.WriteLine(e.ToString());
}
然后写个发Udp的服务器 <div class="cnblogs_code">代码 :<div style="display: block;" id="cnblogs_code_open_7f65fb5c-36d6-4545-bb7a-62f606976cee" class="cnblogs_code_hide" jquery1260496893593="7"><pre><div><!--
Code highlighting produced by Actipro CodeHighlighter (freeware)
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-->UdpClient udpClient = new UdpClient(11001);
try
{
udpClient.Connect(IPAddress.Parse("192.168.0.255"), 11000);
Byte[] sendBytes = Encoding.ASCII.GetBytes("Is anybody thereA?");
udpClient.Send(sendBytes, sendBytes.Length);
udpClient.Close();
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
</div></pre></div></div>其中192.168.0.255是你的内网广播地址，11000是客户端的端口。广播地址是通过你的子网掩码获得的例如你的网关是192.168.0.1，掩码是255.255.255.0，那么你的广播地址就是192.168.0.255.
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