Attribute VB_Name = "Module1"
Option Explicit

Public Const NCBASTAT As Long = &H33
Public Const NCBNAMSZ As Long = 16
Public Const HEAP_ZERO_MEMORY As Long = &H8
Public Const HEAP_GENERATE_EXCEPTIONS As Long = &H4
Public Const NCBRESET As Long = &H32

Public Type NET_CONTROL_BLOCK  'NCB
   ncb_command    As Byte
   ncb_retcode    As Byte
   ncb_lsn        As Byte
   ncb_num        As Byte
   ncb_buffer     As Long
   ncb_length     As Integer
   ncb_callname   As String * NCBNAMSZ
   ncb_name       As String * NCBNAMSZ
   ncb_rto        As Byte
   ncb_sto        As Byte
   ncb_post       As Long
   ncb_lana_num   As Byte
   ncb_cmd_cplt   As Byte
   ncb_reserve(9) As Byte ' 保留，必須為0
   ncb_event      As Long
End Type

Public Type ADAPTER_STATUS
   adapter_address(5) As Byte
   rev_major         As Byte
   reserved0         As Byte
   adapter_type      As Byte
   rev_minor         As Byte
   duration          As Integer
   frmr_recv         As Integer
   frmr_xmit         As Integer
   iframe_recv_err   As Integer
   xmit_aborts       As Integer
   xmit_success      As Long
   recv_success      As Long
   iframe_xmit_err   As Integer
   recv_buff_unavail As Integer
   t1_timeouts       As Integer
   ti_timeouts       As Integer
   Reserved1         As Long
   free_ncbs         As Integer
   max_cfg_ncbs      As Integer
   max_ncbs          As Integer
   xmit_buf_unavail  As Integer
   max_dgram_size    As Integer
   pending_sess      As Integer
   max_cfg_sess      As Integer
   max_sess          As Integer
   max_sess_pkt_size As Integer
   name_count        As Integer
End Type
   
Public Type NAME_BUFFER
   name        As String * NCBNAMSZ
   name_num    As Integer
   name_flags  As Integer
End Type

Public Type ASTAT
   adapt          As ADAPTER_STATUS
   NameBuff(30)   As NAME_BUFFER
End Type

Public Declare Function Netbios Lib "netapi32.dll" _
   (pncb As NET_CONTROL_BLOCK) As Byte
     
Public Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" _
   (hpvDest As Any, ByVal _
    hpvSource As Long, ByVal _
    cbCopy As Long)
     
Public Declare Function GetProcessHeap Lib "kernel32" () As Long

Public Declare Function HeapAlloc Lib "kernel32" _
    (ByVal hHeap As Long, ByVal dwFlags As Long, _
     ByVal dwBytes As Long) As Long
     
Public Declare Function HeapFree Lib "kernel32" _
    (ByVal hHeap As Long, _
     ByVal dwFlags As Long, _
     lpMem As Any) As Long


Public Function GetMACAddress() As String

  '返回一個格式化的網絡控制器的MAC地址
   Dim tmp As String
   Dim pASTAT As Long
   Dim NCB As NET_CONTROL_BLOCK
   Dim AST As ASTAT
  'IBM NetBIOS 3.0在NCBRESET命令中定義了4個基本NetBIOS環境變量，
  'Win32則用OS/2動態連接路由器（DLR）環境。這意味著應用程序使用
  '的第一個NCB必須是一個NCBRESET命令，這里有一個例外是NCBENUM命令。
  'Windows NT與IBM NetBIOS 3.0對NCB_CALLNAME字段的解釋是不同的
   NCB.ncb_command = NCBRESET
   Call Netbios(NCB)
   
  '為獲取以太網卡的媒體訪問控制(MAC)地址，使用Netbios()、NCBASTAT命令，
  '并將NCB.ncb_CallName設置為"*         "(16個字符)。
   NCB.ncb_callname = "*              "
   NCB.ncb_command = NCBASTAT
  '對于有多個網卡的機器，需要執行枚舉LANA數目，并對每個網卡執行NCBASTAT命令
  '即是機器中只有一個網卡，首先枚舉有效的LANA數目，并在其中一個有效的LANA上執行
  'NCBASTAT命令也是非常不錯的。在程序中用硬編碼的方式設置LANA數目為0是不可取的。
   NCB.ncb_lana_num = 0
   NCB.ncb_length = Len(AST)
   pASTAT = HeapAlloc(GetProcessHeap(), HEAP_GENERATE_EXCEPTIONS _
            Or HEAP_ZERO_MEMORY, NCB.ncb_length)
   If pASTAT = 0 Then
      Debug.Print "內存分配失敗!"
      Exit Function
   End If
   NCB.ncb_buffer = pASTAT
   Call Netbios(NCB)
   CopyMemory AST, NCB.ncb_buffer, Len(AST)
    tmp = Format$(Hex(AST.adapt.adapter_address(0)), "00") & " " & _
         Format$(Hex(AST.adapt.adapter_address(1)), "00") & " " & _
         Format$(Hex(AST.adapt.adapter_address(2)), "00") & " " & _
         Format$(Hex(AST.adapt.adapter_address(3)), "00") & " " & _
         Format$(Hex(AST.adapt.adapter_address(4)), "00") & " " & _
         Format$(Hex(AST.adapt.adapter_address(5)), "00")
   HeapFree GetProcessHeap(), 0, pASTAT
   GetMACAddress = tmp
End Function