C#获取MAC地址的几种方法（补充版）
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关于获取本地电脑的MAC地址，除了前面说过的根据WMI获取http://blog.csdn.net/yysyangyangyangshan/article/details/6803787，其实还有好几种方式来获取mac地址，下面一一道来。
首先需要用到的一些方法和类：
public enum NCBCONST { NCBNAMSZ = 16, MAX_LANA = 254, NCBENUM = 0x37, NRC_GOODRET = 0x00, NCBRESET = 0x32, NCBASTAT = 0x33, NUM_NAMEBUF = 30, } [StructLayout(LayoutKind.Sequential)] public struct ADAPTER_STATUS { [MarshalAs(UnmanagedType.ByValArray, SizeConst = 6)] public byte[] adapter_address; public byte rev_major; public byte reserved0; public byte adapter_type; public byte rev_minor; public ushort duration; public ushort frmr_recv; public ushort frmr_xmit; public ushort iframe_recv_err; public ushort xmit_aborts; public uint xmit_success; public uint recv_success; public ushort iframe_xmit_err; public ushort recv_buff_unavail; public ushort t1_timeouts; public ushort ti_timeouts; public uint reserved1; public ushort free_ncbs; public ushort max_cfg_ncbs; public ushort max_ncbs; public ushort xmit_buf_unavail; public ushort max_dgram_size; public ushort pending_sess; public ushort max_cfg_sess; public ushort max_sess; public ushort max_sess_pkt_size; public ushort name_count; } [StructLayout(LayoutKind.Sequential)] public struct NAME_BUFFER { [MarshalAs(UnmanagedType.ByValArray, SizeConst = (int)NCBCONST.NCBNAMSZ)] public byte[] name; public byte name_num; public byte name_flags; } [StructLayout(LayoutKind.Sequential)] public struct NCB { public byte ncb_command; public byte ncb_retcode; public byte ncb_lsn; public byte ncb_num; public IntPtr ncb_buffer; public ushort ncb_length; [MarshalAs(UnmanagedType.ByValArray, SizeConst = (int)NCBCONST.NCBNAMSZ)] public byte[] ncb_callname; [MarshalAs(UnmanagedType.ByValArray, SizeConst = (int)NCBCONST.NCBNAMSZ)] public byte[] ncb_name; public byte ncb_rto; public byte ncb_sto; public IntPtr ncb_post; public byte ncb_lana_num; public byte ncb_cmd_cplt; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 10)] public byte[] ncb_reserve; public IntPtr ncb_event; } [StructLayout(LayoutKind.Sequential)] public struct LANA_ENUM { public byte length; [MarshalAs(UnmanagedType.ByValArray, SizeConst = (int)NCBCONST.MAX_LANA)] public byte[] lana; } [StructLayout(LayoutKind.Auto)] public struct ASTAT { public ADAPTER_STATUS adapt; [MarshalAs(UnmanagedType.ByValArray, SizeConst = (int)NCBCONST.NUM_NAMEBUF)] public NAME_BUFFER[] NameBuff; } public class Win32API { [DllImport("NETAPI32.DLL")] public static extern char Netbios(ref NCB ncb); } [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)] public class IP_Adapter_Addresses { public uint Length; public uint IfIndex; public IntPtr Next; public IntPtr AdapterName; public IntPtr FirstUnicastAddress; public IntPtr FirstAnycastAddress; public IntPtr FirstMulticastAddress; public IntPtr FirstDnsServerAddress; public IntPtr DnsSuffix; public IntPtr Description; public IntPtr FriendlyName; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)] public Byte[] PhysicalAddress; public uint PhysicalAddressLength; public uint flags; public uint Mtu; public uint IfType; public uint OperStatus; public uint Ipv6IfIndex; public uint ZoneIndices; public IntPtr FirstPrefix; }1、 SendArp 获取MAC地址
SendARP函数用来发送ARP数据包并在定义的MAC缓冲区中返回定义的IP对应的MAC地址
SendARP(
IPAddr DestIP,
IPAddr SrcIP,
PULONG pMacAddr,
PULONG PhyAddrLen
);
第一个参数是IP地址的网络字节顺序，而不是一个指针，当初我就是赋值成指针而使得获取不了MAC地址。
第二个参数填0就可以
第三个参数是MAC缓冲区指针
第四个参数是一个指向一个DWORD型数值为6的指针
代码如下：
[DllImport("Iphlpapi.dll")] static extern int SendARP(Int32 DestIP, Int32 SrcIP, ref Int64 MacAddr, ref Int32 PhyAddrLen); /// <summary> /// SendArp获取MAC地址 /// </summary> /// <returns></returns> public string GetMacAddressBySendARP() { StringBuilder strReturn = new StringBuilder(); try { System.Net.IPHostEntry Tempaddr = (System.Net.IPHostEntry)Dns.GetHostByName(Dns.GetHostName()); System.Net.IPAddress[] TempAd = Tempaddr.AddressList; Int32 remote = (int)TempAd[0].Address; Int64 macinfo = new Int64(); Int32 length = 6; SendARP(remote, 0, ref macinfo, ref length); string temp = System.Convert.ToString(macinfo, 16).PadLeft(12, '0').ToUpper(); int x = 12; for (int i = 0; i < 6; i++) { if (i == 5) { strReturn.Append(temp.Substring(x - 2, 2)); } else { strReturn.Append(temp.Substring(x - 2, 2) + ":"); } x -= 2; } return strReturn.ToString(); } catch { return ""; } }2、通过适配器信息获取MAC地址
iphlpapi.dll是Windows IP辅助API应用程序接口模块。其中一个函数GetAdaptersAddresses：返回和适配器关联的地址
uint GetAdaptersAddresses(uint Family, uint flags, IntPtr Reserved,
IntPtr PAdaptersAddresses, ref uint pOutBufLen);
Family：[输入]获得地址族，必须是以下值之一：
AF_INET (仅返回IPv4地址)，
AF_INET6（仅返回IPv6地址），
AF_UNSPEC（从所有的地址族返回地址）
Flags：[输入]返回地址类型，这个参数为0或是以下值的联合值：
GAA_FLAG_INCLUDE_PREFIX （返回IPv6地址前缀）
GAA_FLAG_SKIP_UNICAST（不返回unicast地址）
GAA_FLAG_SKIP_ANYCAST（不返回anycast地址）
GAA_FLAG_SKIP_FRIENDLY_NAME（不返回适配器的友好名称）
GAA_FLAG_SKIP_MULTICAST （不返回多点传送（multicast）地址）
GAA_FLAG_SKIP_DNS_SERVER （不返回DNS服务器地址）
Reserved：调用程序必须将此参数置为NULL
pAdapterAddresses：[输入，输出] 指向一段IP_ADAPTER_ADDRESSES缓存，成功的话，该缓存包含地址信息。
pOutBufLen：[输出] 返回pAdapterAddresses所在缓存的大小
返回值：成功，返回0；失败，返回错误代码。
代码如下：
[DllImport("Iphlpapi.dll")] public static extern uint GetAdaptersAddresses(uint Family, uint flags, IntPtr Reserved, IntPtr PAdaptersAddresses, ref uint pOutBufLen); /// <summary> /// 通过适配器信息获取MAC地址 /// </summary> /// <returns></returns> public string GetMacAddressByAdapter() { string macAddress = ""; try { IntPtr PAdaptersAddresses = new IntPtr(); uint pOutLen = 100; PAdaptersAddresses = Marshal.AllocHGlobal(100); uint ret = GetAdaptersAddresses(0, 0, (IntPtr)0, PAdaptersAddresses, ref pOutLen); if (ret == 111) { Marshal.FreeHGlobal(PAdaptersAddresses); PAdaptersAddresses = Marshal.AllocHGlobal((int)pOutLen); ret = GetAdaptersAddresses(0, 0, (IntPtr)0, PAdaptersAddresses, ref pOutLen); } IP_Adapter_Addresses adds = new IP_Adapter_Addresses(); IntPtr pTemp = PAdaptersAddresses; while (pTemp != (IntPtr)0) { Marshal.PtrToStructure(pTemp, adds); string adapterName = Marshal.PtrToStringAnsi(adds.AdapterName); string FriendlyName = Marshal.PtrToStringAuto(adds.FriendlyName); string tmpString = string.Empty; for (int i = 0; i < 6; i++) { tmpString += string.Format("{0:X2}", adds.PhysicalAddress[i]); if (i < 5) { tmpString += ":"; } } RegistryKey theLocalMachine = Registry.LocalMachine; RegistryKey theSystem = theLocalMachine.OpenSubKey(@"SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces"); RegistryKey theInterfaceKey = theSystem.OpenSubKey(adapterName); if (theInterfaceKey != null) { macAddress = tmpString; break; } pTemp = adds.Next; } } catch { } return macAddress; }3、 通过NetBios获取MAC地址
NetBIOS（网络基本输入/输出系统）是一套用于网络通讯的调用接口，包含NetBIOS Name和MAC地址等信息。该方法获取MAC地址的效率较高。
代码如下：
/// <summary> /// 通过NetBios获取MAC地址 /// </summary> /// <returns></returns> public string GetMacAddressByNetBios() { string macAddress = ""; try { string addr = ""; int cb; ASTAT adapter; NCB Ncb = new NCB(); char uRetCode; LANA_ENUM lenum; Ncb.ncb_command = (byte)NCBCONST.NCBENUM; cb = Marshal.SizeOf(typeof(LANA_ENUM)); Ncb.ncb_buffer = Marshal.AllocHGlobal(cb); Ncb.ncb_length = (ushort)cb; uRetCode = Win32API.Netbios(ref Ncb); lenum = (LANA_ENUM)Marshal.PtrToStructure(Ncb.ncb_buffer, typeof(LANA_ENUM)); Marshal.FreeHGlobal(Ncb.ncb_buffer); if (uRetCode != (short)NCBCONST.NRC_GOODRET) return ""; for (int i = 0; i < lenum.length; i++) { Ncb.ncb_command = (byte)NCBCONST.NCBRESET; Ncb.ncb_lana_num = lenum.lana[i]; uRetCode = Win32API.Netbios(ref Ncb); if (uRetCode != (short)NCBCONST.NRC_GOODRET) return ""; Ncb.ncb_command = (byte)NCBCONST.NCBASTAT; Ncb.ncb_lana_num = lenum.lana[i]; Ncb.ncb_callname[0] = (byte)'*'; cb = Marshal.SizeOf(typeof(ADAPTER_STATUS)) + Marshal.SizeOf(typeof(NAME_BUFFER)) * (int)NCBCONST.NUM_NAMEBUF; Ncb.ncb_buffer = Marshal.AllocHGlobal(cb); Ncb.ncb_length = (ushort)cb; uRetCode = Win32API.Netbios(ref Ncb); adapter.adapt = (ADAPTER_STATUS)Marshal.PtrToStructure(Ncb.ncb_buffer, typeof(ADAPTER_STATUS)); Marshal.FreeHGlobal(Ncb.ncb_buffer); if (uRetCode == (short)NCBCONST.NRC_GOODRET) { if (i > 0) addr += ":"; addr = string.Format("{0,2:X}:{1,2:X}:{2,2:X}:{3,2:X}:{4,2:X}:{5,2:X}", adapter.adapt.adapter_address[0], adapter.adapt.adapter_address[1], adapter.adapt.adapter_address[2], adapter.adapt.adapter_address[3], adapter.adapt.adapter_address[4], adapter.adapt.adapter_address[5]); } } macAddress = addr.Replace(' ', '0'); } catch { } return macAddress; }4、 通过DOS命令获得MAC地址
这个就是使用ipconfig命令，并需要在程序中启用cmd，程序中使用cmd如下即可，或参见http://blog.csdn.net/yysyangyangyangshan/article/details/6799489,
代码如下：
/// <summary> /// 通过DOS命令获得MAC地址 /// </summary> /// <returns></returns> public string GetMacAddressByDos() { string macAddress = ""; Process p = null; StreamReader reader = null; try { ProcessStartInfo start = new ProcessStartInfo("cmd.exe"); start.FileName = "ipconfig"; start.Arguments = "/all"; start.CreateNoWindow = true; start.RedirectStandardOutput = true; start.RedirectStandardInput = true; start.UseShellExecute = false; p = Process.Start(start); reader = p.StandardOutput; string line = reader.ReadLine(); while (!reader.EndOfStream) { if (line.ToLower().IndexOf("physical address") > 0 || line.ToLower().IndexOf("物理地址") > 0) { int index = line.IndexOf(":"); index += 2; macAddress = line.Substring(index); macAddress = macAddress.Replace('-', ':'); break; } line = reader.ReadLine(); } } catch { } finally { if (p != null) { p.WaitForExit(); p.Close(); } if (reader != null) { reader.Close(); } } return macAddress; }5、 NetworkInterface获取MAC地址
NetworkInterface，提供网络接口的配置和统计信息。NetworkInterface.GetAllNetworkInterfaces，返回描述本地计算机上的网络接口的对象。
代码如下：
/// <summary> /// 通过网络适配器获取MAC地址 /// </summary> /// <returns></returns> public string GetMacAddressByNetworkInformation() { string macAddress = ""; try { NetworkInterface[] nics = NetworkInterface.GetAllNetworkInterfaces(); foreach (NetworkInterface adapter in nics) { if (!adapter.GetPhysicalAddress().ToString().Equals("")) { macAddress = adapter.GetPhysicalAddress().ToString(); for (int i = 1; i < 6; i++) { macAddress = macAddress.Insert(3 * i - 1, ":"); } break; } } } catch { } return macAddress; }完整代码下载地址：http://download.csdn.net/download/yysyangyangyangshan/3949946
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