C#使用API利用ARP协议获得同网段计算机的MAC

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MAc c#

使用API，利用ARP协议，只能获得同网段计算机的MAC

        [DllImport("Iphlpapi.dll")]

        private static extern int SendARP(Int32 dest,Int32 host,ref Int64 mac,ref Int32 length);

        [DllImport("Ws2_32.dll")]

        private static extern Int32 inet_addr(string ip);

        public static string GetRemoteMac(string clientIP)

        {

            string ip = clientIP;

            if ( ip == "127.0.0.1")

                ip = GetLocalIP()[0];

            Int32 ldest=inet_addr(ip);

            Int64 macinfo=new Int64();

            Int32 len=6;

            try

            {

                SendARP(ldest,0,ref macinfo,ref len);

            }

            catch

            {

                return "";

            }

            string originalMACAddress = Convert.ToString(macinfo,16);

            if (originalMACAddress.Length<12)

            {

                originalMACAddress = originalMACAddress.PadLeft(12,'0');

            }

            string macAddress;

            if(originalMACAddress!="0000" && originalMACAddress.Length==12)

            {

                string mac1,mac2,mac3,mac4,mac5,mac6;

                mac1=originalMACAddress.Substring(10,2);

                mac2=originalMACAddress.Substring(8,2);

                mac3=originalMACAddress.Substring(6,2);

                mac4=originalMACAddress.Substring(4,2);

                mac5=originalMACAddress.Substring(2,2);

                mac6=originalMACAddress.Substring(0,2);

                macAddress=mac1+"-"+mac2+"-"+mac3+"-"+mac4+"-"+mac5+"-"+mac6;

            }

            else

            {

                macAddress="";

            }

            return macAddress.ToUpper();

        }