c 中使用ARP獲取mac位址

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.i**atch(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 ++)

strret = strbmac.tostring();

return strret;

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