取得网卡序列号   

　　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