C#中通过SendARP读取MAC地址

C#中通过SendARP读取MAC地址：

using System.Runtime.InteropServices;

publicstaticstring GetMacBySendARP(string remoteIP)
{
  StringBuilder macAddress =new StringBuilder();

  try
  {
    Int32 remote = inet_addr(remoteIP);

    Int64 macInfo =new Int64();
    Int32 length =;
    SendARP(remote, , ref macInfo, ref length);

    string temp = Convert.ToString(macInfo, ).PadLeft(, '').ToUpper();

    int x =;
    for (int i =; i <; i++)
    {
      if (i ==)
      {
        macAddress.Append(temp.Substring(x -, ));
      }
      else
      {
        macAddress.Append(temp.Substring(x -, ) +"-");
      }
      x -=;
    }

    return macAddress.ToString();
  }
  catch
  {
    return macAddress.ToString();
  }
}

[DllImport("Iphlpapi.dll")]
privatestaticexternint SendARP(Int32 dest, Int32 host, ref Int64 mac, ref Int32 length);
[DllImport("Ws2_32.dll")]
privatestaticextern Int32 inet_addr(string ip);