CommHelper.cs
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using System;
using System.Collections.Generic;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
namespace DL.Com
{
public class ComHelper
{
static UdpClient broadcastClient; //广播客户端
static IPEndPoint broadcastEndPoint; //广播远程节点
static byte[] broadcastBuffer; //远程返回数据
/// <summary>
/// 自动获取IP地址，未连接前使用，必须在同一网段
/// </summary>
/// <param name="localIP">本地IP地址</param>
/// <returns></returns>
public static bool AutoIP(string localIP,out string ip)
{
ip = "";
try
{
IPEndPoint local = new IPEndPoint(IPAddress.Parse(localIP), 55654);
broadcastClient = new UdpClient(local);
broadcastBuffer = null;
Thread tTemp = new Thread(new ThreadStart(GetIP));
tTemp.Start();
broadcastEndPoint = new IPEndPoint(IPAddress.Parse("255.255.255.255"), 1024);
byte[] dgram = new byte[] { 0x05, 0x00, 0x07, 0x00, 0x00, 0xC1, 0x59 };
broadcastClient.Send(dgram, dgram.Length, broadcastEndPoint);
Thread.Sleep(1000);
tTemp.Abort();
broadcastClient.Close();
//ErrInfo = "无法访问";
if (broadcastBuffer == null) return false;
if (broadcastBuffer[0] != 0x3B) return false;
byte[] buff = new byte[broadcastBuffer[7]];
Array.Copy(broadcastBuffer, 9, buff, 0, buff.Length);
ip = buff[buff.Length - 12] + "." + buff[buff.Length - 11] + "." + buff[buff.Length - 10] + "." + buff[buff.Length - 9];
//ErrInfo = "OK";
return true;
}
catch (Exception ex)
{
return false;
}
}
/// <summary>
/// 获取目标IP地址
/// </summary>
static void GetIP()
{
broadcastBuffer = broadcastClient.Receive(ref broadcastEndPoint);
}
}
}