想做一个注册系统注册用户，但是最关键的是： 一个用户名在一台机器首次上登陆后，这个用户名以后只能在这台机器上使用，无法再其它机器上登陆。 请大家多多帮忙，发表大家的看法。谢谢啦！

zhj268@163.com

你知道怎么读mac吗？？我觉得读用户名比较好，

读mac比较好!

用户名可能会有重复的!!!!

把读mac的程序发上来拉

Option Compare Database

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