用C#取网卡MAC地址的类源码

未知 aspxcn.com 2002-09-19

在下公布这段代码，目的是与大家探讨有无更好的实现方法（如.NET存在直接调用？）。

在下愿与大家共同挖掘C#的精妙之处，一起揭示C#的神秘面纱。 如有不妥，可尽情表达。

1、

public enum NCBCONST
{
    NCBNAMSZ = 16,       /* absolute length of a net name         */
    MAX_LANA = 254,      /* lana's in range 0 to MAX_LANA inclusive   */
    NCBENUM = 0x37,      /* NCB ENUMERATE LANA NUMBERS            */
    NRC_GOODRET = 0x00,  /* good return                              */
    NCBRESET = 0x32,     /* NCB RESET                        */
    NCBASTAT = 0x33,     /* NCB ADAPTER STATUS                  */
    NUM_NAMEBUF = 30,    /* Number of NAME's BUFFER               */
}

[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);
}

2、

public string GetMacAddress()
{
    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]);
        }
    }
    return addr.Replace(' ', '0');
}