c#中使用ARP获取mac地址

using System.Runtime.InteropServices;

using System.Text.RegularExpressions;

using System.Text;

 

 

[DllImport("Iphlpapi.dll")]

private static unsafe extern int SendARP(Int32 dest,Int32 host,ref Int32 mac,ref Int32 length);

[DllImport("Ws2_32.dll")]

private static extern Int32 inet_addr(string ip); 

public string GetMACFromIP(string A_strIP)

{

string strRet = "Unknown";

 

string strIPPattern = @"^/d+/./d+/./d+/./d+$";

 

Regex objRex =new Regex(strIPPattern);

 

if(objRex.IsMatch(A_strIP) == true)

{

Int32 intDest = inet_addr(A_strIP);

Int32 [] arrMAC = new Int32[2];

Int32 intLen = 6;

 

int intResult = SendARP(intDest,0,ref arrMAC[0],ref intLen);

 

if(intResult == 0)

{

Byte [] arrbyte = new Byte[8];

arrbyte[5] = (Byte)(arrMAC[1] >> 8);

arrbyte[4] = (Byte)arrMAC[1];

arrbyte[3] = (Byte)(arrMAC[0] >> 24);

arrbyte[2] = (Byte)(arrMAC[0] >> 16);

arrbyte[1] = (Byte)(arrMAC[0] >> 8);

arrbyte[0] = (Byte)arrMAC[0];

 

StringBuilder strbMAC = new StringBuilder();

 

for(int intIndex = 0 ;intIndex < 6;intIndex ++)

{

if(intIndex > 0) strbMAC.Append("-");

strbMAC.Append(arrbyte[intIndex].ToString("X2"));

}

strRet = strbMAC.ToString();

}

}

 

return strRet;

}