学步园

        /// <summary>
        /// 调用API获取MAC地址
        /// </summary>
        /// <param name="p_Id">IP地址</param>
        /// <returns>MAC地址</returns>
        public static string GetMac(string p_Id)
        {
            IPAddress _Address;
            if (!IPAddress.TryParse(p_Id, out _Address)) return "";
            uint DestIP = System.BitConverter.ToUInt32(_Address.GetAddressBytes(), 0);
            ulong pMacAddr = 0;
            uint PhyAddrLen = 6;
            uint error_code = SendARP(DestIP, 0, ref pMacAddr, ref PhyAddrLen);
            byte[] _Bytes1 =BitConverter.GetBytes(pMacAddr);
            return BitConverter.ToString(_Bytes1,0,6);
        }

/// <summary>
        /// 使用ARP获取MAC地址
        /// </summary>
        /// <param name="DestIP">目标IP</param>
        /// <param name="SrcIP">0</param>
        /// <param name="pMacAddr">两个uint 都是255</param>
        /// <param name="PhyAddrLen">长度6</param>
        /// <returns>返回错误信息</returns>
        [DllImport("Iphlpapi.dll")]
        public static extern uint SendARP(uint DestIP, uint SrcIP, ref ulong pMacAddr, ref uint PhyAddrLen);