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