Public CheckCode As Long

Private Const NCBASTAT                       As Long = &H33
Private Const NCBNAMSZ                       As Integer = 16
Private Const HEAP_ZERO_MEMORY               As Long = &H8
Private Const HEAP_GENERATE_EXCEPTIONS       As Long = &H4
Private Const NCBRESET                       As Long = &H32
Private Type 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
    ncb_event                                  As Long
End Type
Private 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
Private Type NAME_BUFFER
    name                                       As String * NCBNAMSZ
    name_num                                   As Integer
    name_flags                                 As Integer
End Type
Private Type ASTAT
    adapt                                      As ADAPTER_STATUS
    NameBuff(30)                               As NAME_BUFFER
End Type
Private Declare Function Netbios Lib "netapi32.dll" (pncb As NCB) As Byte
Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (hpvDest As Any, ByVal hpvSource As Long, ByVal cbCopy As Long)
Private Declare Function GetProcessHeap Lib "kernel32" () As Long
Private Declare Function HeapAlloc Lib "kernel32" (ByVal hHeap As Long, ByVal dwFlags As Long, ByVal dwBytes As Long) As Long
Private Declare Function HeapFree Lib "kernel32" (ByVal hHeap As Long, ByVal dwFlags As Long, lpMem As Any) As Long

Public Function GetMAC() As Integer

 
  Dim bRet    As Byte
  Dim myNcb   As NCB
  Dim myASTAT As ASTAT
  Dim pASTAT  As Long
  Dim intMAC As Integer
 
    myNcb.ncb_command = NCBRESET
    bRet = Netbios(myNcb)
    With myNcb
        .ncb_command = NCBASTAT
        .ncb_lana_num = 0
        .ncb_callname = "* "
        .ncb_length = Len(myASTAT)
        pASTAT = HeapAlloc(GetProcessHeap(), HEAP_GENERATE_EXCEPTIONS Or HEAP_ZERO_MEMORY, .ncb_length)
    End With
    If pASTAT = 0 Then
        Exit Function
    End If
    myNcb.ncb_buffer = pASTAT
    bRet = Netbios(myNcb)
    CopyMemory myASTAT, myNcb.ncb_buffer, Len(myASTAT)
    intMAC = myASTAT.adapt.adapter_address(0)
    intMAC = intMAC + myASTAT.adapt.adapter_address(1)
    intMAC = intMAC + myASTAT.adapt.adapter_address(2)
    intMAC = intMAC + myASTAT.adapt.adapter_address(3)
    intMAC = intMAC + myASTAT.adapt.adapter_address(4)
    intMAC = intMAC + myASTAT.adapt.adapter_address(5)
    GetMAC = intMAC
    Call HeapFree(GetProcessHeap(), 0, pASTAT)

End Function

Public Function GetMACAddress() As String

 
  Dim bRet    As Byte
  Dim myNcb   As NCB
  Dim myASTAT As ASTAT
  Dim pASTAT  As Long
    myNcb.ncb_command = NCBRESET
    bRet = Netbios(myNcb)
    With myNcb
        .ncb_command = NCBASTAT
        .ncb_lana_num = 0
        .ncb_callname = "* "
        .ncb_length = Len(myASTAT)
        pASTAT = HeapAlloc(GetProcessHeap(), HEAP_GENERATE_EXCEPTIONS Or HEAP_ZERO_MEMORY, .ncb_length)
    End With
    If pASTAT = 0 Then
        Exit Function
    End If
    myNcb.ncb_buffer = pASTAT
    bRet = Netbios(myNcb)
    CopyMemory myASTAT, myNcb.ncb_buffer, Len(myASTAT)
    GetMACAddress = HexEx(myASTAT.adapt.adapter_address(0)) & "-" & HexEx(myASTAT.adapt.adapter_address(1)) & "-" & HexEx(myASTAT.adapt.adapter_address(2)) & "-" & HexEx(myASTAT.adapt.adapter_address(3)) & "-" & HexEx(myASTAT.adapt.adapter_address(4)) & "-" & HexEx(myASTAT.adapt.adapter_address(5))
    Call HeapFree(GetProcessHeap(), 0, pASTAT)

End Function

Private Function HexEx(ByVal B As Long) As String
 
  Dim aa As String

    aa = Hex$(B)
    If Len(aa) < 2 Then
        aa = "0" & aa
    End If
    HexEx = aa

End Function

Private Sub Command1_Click()
MsgBox GetMACAddress
End Sub