通过 Visual Basic 获取网卡地址

[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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