很多软件以取得网卡地址作为License验证，这不失为一个验证合法用户的好办法，不过要付出回复用户电话、传真的代价哦　^_^
　　将下面这段代码拷贝到程序中，然后在你的程序需要的时候调用EthernetAddress(0),该函数返回的字符串就是您机器上网卡的以太序列号。

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
　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 ' Reserved, must be 0
　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

Private Function EthernetAddress(LanaNumber As Long) _
As String

　Dim udtNCB　　　 As NCB
　Dim bytResponse　As Byte
　Dim udtASTAT　　 As ASTAT
　Dim udtTempASTAT As ASTAT
　Dim lngASTAT　　 As Long
　Dim strOut　　　 As String
　Dim x　　　　　　As Integer

　udtNCB.ncb_command = NCBRESET
　bytResponse = Netbios(udtNCB)
　udtNCB.ncb_command = NCBASTAT
　udtNCB.ncb_lana_num = LanaNumber
　udtNCB.ncb_callname = "* "
　udtNCB.ncb_length = Len(udtASTAT)
　lngASTAT = HeapAlloc(GetProcessHeap(), _
HEAP_GENERATE_EXCEPTIONS Or HEAP_ZERO_MEMORY, udtNCB.ncb_length)

　strOut = ""
　If lngASTAT Then
　　udtNCB.ncb_buffer = lngASTAT
　　bytResponse = Netbios(udtNCB)
　　CopyMemory udtASTAT, udtNCB.ncb_buffer, Len(udtASTAT)
　　 With udtASTAT.adapt
　　　For x = 0 To 5
　　　　strOut = strOut & Right$("00" & Hex$(.adapter_address(x)), 2)
　　　Next x
　　End With
　　HeapFree GetProcessHeap(), 0, lngASTAT
　End If
　EthernetAddress = strOut
End Function