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8、如何通過(guò)VB獲取網(wǎng)卡地址
[功能描述] IPX和NETBIOS接口需要網(wǎng)絡(luò)地址。該文通過(guò)詳細(xì)的步驟演示了如何通過(guò)VB獲取網(wǎng)卡地址。
步驟：
1)在Visual Basic生成標(biāo)準(zhǔn)的EXE文件。缺省創(chuàng)建 Form1。
2)在Form1中添加一命令按鈕，缺省名為Command1。
3)把下列代碼放到Form1中說(shuō)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
把下面的代碼放入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，運(yùn)行該程序。
5)點(diǎn)擊Command1。注意，網(wǎng)卡地址將在一信息框中顯示出來(lái)。