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VB取网卡MAC地址代码

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[功能描述] IPX和NETBIOS接口需要网络地址。该文通过详细的步骤演示了如何通过VB获取网卡地址。
步骤:

1)在Visual Basic生成标准的EXE文件。缺省创建 Form1。
2)在Form1中添加一命令按钮,缺省名为Command1。
3)把下列代码放到Form1中说明部分。

Option Explicit
Private Const NCBASTAT = &H33
Private Const NCBNAMSZ = 16
Private Const HEAP_ZERO_MEMORY = &H8
Private Const HEAP_GENERATE_EXCEPTIONS = &H4
Private Const NCBRESET = &H32

Private Type NCB
  ncb_command As Byte \'Integer
  ncb_retcode As Byte \'Integer
  ncb_lsn As Byte \'Integer
  ncb_num As Byte \' Integer
  ncb_buffer As Long \'String
  ncb_length As Integer
  ncb_callname As String * NCBNAMSZ
  ncb_name As String * NCBNAMSZ
  ncb_rto As Byte \'Integer
  ncb_sto As Byte \' Integer
  ncb_post As Long
  ncb_lana_num As Byte \'Integer
  ncb_cmd_cplt As Byte \'Integer
  ncb_reserve(9) As Byte \' Reserved, must be 0
  ncb_event As Long
End Type

Private Type ADAPTER_STATUS
  adapter_address(5) As Byte \'As String * 6
  rev_major As Byte \'Integer
  reserved0 As Byte \'Integer
  adapter_type As Byte \'Integer
  rev_minor As Byte \'Integer
  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

把下面的代码放入Command1_Click的事件中:

Private Sub Command1_Click()
  Dim myNcb As NCB
  Dim bRet As Byte
  myNcb.ncb_command = NCBRESET
  bRet = Netbios(myNcb)
  myNcb.ncb_command = NCBASTAT
  myNcb.ncb_lana_num = 0
  myNcb.ncb_callname = "*       "
  Dim myASTAT As ASTAT, tempASTAT As ASTAT
  Dim pASTAT As Long
  myNcb.ncb_length = Len(myASTAT)
  Debug.Print Err.LastDllError
  pASTAT = HeapAlloc(GetProcessHeap(), HEAP_GENERATE_EXCEPTIONS Or HEAP_ZERO_MEMORY, myNcb.ncb_length)
  If pASTAT = 0 Then
    Debug.Print "memory allcoation failed!"
    Exit Sub
  End If
  myNcb.ncb_buffer = pASTAT
  bRet = Netbios(myNcb)
  Debug.Print Err.LastDllError
  CopyMemory myASTAT, myNcb.ncb_buffer, Len(myASTAT)
  MsgBox Hex(myASTAT.adapt.adapter_address(0)) & " " & Hex(myASTAT.adapt.adapter_address(1)) _
    & " " & Hex(myASTAT.adapt.adapter_address(2)) & " " _
    & Hex(myASTAT.adapt.adapter_address(3)) _
    & " " & Hex(myASTAT.adapt.adapter_address(4)) & " " _
    & Hex(myASTAT.adapt.adapter_address(5))
  HeapFree GetProcessHeap(), 0, pASTAT
End Sub

4)按F5,运行该程序。
5)点击Command1。注意,网卡地址将在一信息框中显示出来。
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