Hej

Går det att få fram en besökares MAC Adress från Vb?

Du kanske kan frå fram någto ur denna kod:

<code>
Option Explicit

Public Const NCBASTAT As Long = &H33
Public Const NCBNAMSZ As Long = 16
Public Const HEAP_ZERO_MEMORY As Long = &H8
Public Const HEAP_GENERATE_EXCEPTIONS As Long = &H4
Public Const NCBRESET As Long = &H32

Public Type NET_CONTROL_BLOCK '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

Public 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

Public Type NAME_BUFFER
name As String * NCBNAMSZ
name_num As Integer
name_flags As Integer
End Type

Public Type ASTAT
adapt As ADAPTER_STATUS
NameBuff(30) As NAME_BUFFER
End Type

Public Declare Function Netbios Lib "netapi32" _
(pncb As NET_CONTROL_BLOCK) As Byte

Public Declare Sub CopyMemory Lib "kernel32" _
Alias "RtlMoveMemory" _
(hpvDest As Any, ByVal _
hpvSource As Long, ByVal _
cbCopy As Long)

Public Declare Function GetProcessHeap Lib "kernel32" () As Long

Public Declare Function HeapAlloc Lib "kernel32" _
(ByVal hHeap As Long, _
ByVal dwFlags As Long, _
ByVal dwBytes As Long) As Long

Public Declare Function HeapFree Lib "kernel32" _
(ByVal hHeap As Long, _
ByVal dwFlags As Long, _
lpMem As Any) As Long


Public Function GetMACAddress() As String

'retrieve the MAC Address for the network controller
'installed, returning a formatted string

Dim tmp As String
Dim pASTAT As Long
Dim NCB As NET_CONTROL_BLOCK
Dim AST As ASTAT

'The IBM NetBIOS 3.0 specifications defines four basic
'NetBIOS environments under the NCBRESET command. Win32
'follows the OS/2 Dynamic Link Routine (DLR) environment.
'This means that the first NCB issued by an application
'must be a NCBRESET, with the exception of NCBENUM.
'The Windows NT implementation differs from the IBM
'NetBIOS 3.0 specifications in the NCB_CALLNAME field.
NCB.ncb_command = NCBRESET
Call Netbios(NCB)

'To get the Media Access Control (MAC) address for an
'ethernet adapter programmatically, use the Netbios()
'NCBASTAT command and provide a "*" as the name in the
'NCB.ncb_CallName field (in a 16-chr string).
NCB.ncb_callname = "* "
NCB.ncb_command = NCBASTAT

'For machines with multiple network adapters you need to
'enumerate the LANA numbers and perform the NCBASTAT
'command on each. Even when you have a single network
'adapter, it is a good idea to enumerate valid LANA numbers
'first and perform the NCBASTAT on one of the valid LANA
'numbers. It is considered bad programming to hardcode the
'LANA number to 0 (see the comments section below).
NCB.ncb_lana_num = 0
NCB.ncb_length = Len(AST)

pASTAT = HeapAlloc(GetProcessHeap(), _
HEAP_GENERATE_EXCEPTIONS Or _
HEAP_ZERO_MEMORY, _
NCB.ncb_length)

If pASTAT = 0 Then
Debug.Print "memory allocation failed!"
Exit Function
End If

NCB.ncb_buffer = pASTAT
Call Netbios(NCB)

CopyMemory AST, NCB.ncb_buffer, Len(AST)

tmp = Right$("00" & Hex(AST.adapt.adapter_address(0)), 2) & " " & _
Right$("00" & Hex(AST.adapt.adapter_address(1)), 2) & " " & _
Right$("00" & Hex(AST.adapt.adapter_address(2)), 2) & " " & _
Right$("00" & Hex(AST.adapt.adapter_address(3)), 2) & " " & _
Right$("00" & Hex(AST.adapt.adapter_address(4)), 2) & " " & _
Right$("00" & Hex(AST.adapt.adapter_address(5)), 2)

HeapFree GetProcessHeap(), 0, pASTAT

GetMACAddress = tmp

End Function
</code>

//Johan N

Jag har själv forskat/letat information i detta ämne en väldigt lång tid.
Jag önskar verkligen jag har fel men såvitt jag har förstått så går det bara att få tag i
en "besökares" MAC Ifall Besökaren själv presenterar den.
Möjligen finns det något sätt att få fram MAC ifall besökaren är på samma Lan/Domän.
Ifall någon hittar ett sätt så är jag jätteintresserad :-)

Knoton