Option Explicit
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' Copyright ©1996-2002 VBnet, Randy Birch, All Rights Reserved.
' Some pages may also contain other copyrights by the author.
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' Distribution: You can freely use this code in your own
' applications, but you can not publish
' or reproduce this code on any web site,
' on any online service, or distribute on
' any media without express permission.
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'Windows type used to call the Net API
Private Type USER_INFO_10
usr10_name As Long
usr10_comment As Long
usr10_usr_comment As Long
usr10_full_name As Long
End Type
'private type to hold the actual strings displayed
Private Type USER_INFO
name As String
full_name As String
comment As String
usr_comment As String
End Type
Private Const ERROR_SUCCESS As Long = 0&
Private Const MAX_COMPUTERNAME As Long = 15
Private Const MAX_USERNAME As Long = 256
Private Const FILTER_NORMAL_ACCOUNT As Long = &H2
Private Declare Function NetUserGetInfo Lib "netapi32" _
(lpServer As Byte, _
username As Byte, _
ByVal level As Long, _
lpBuffer As Long) As Long
Private Declare Function NetUserEnum Lib "netapi32" _
(servername As Byte, _
ByVal level As Long, _
ByVal filter As Long, _
buff As Long, _
ByVal buffsize As Long, _
entriesread As Long, _
totalentries As Long, _
resumehandle As Long) As Long
Private Declare Function NetApiBufferFree Lib "netapi32" _
(ByVal Buffer As Long) As Long
Private Declare Function GetUserName Lib "advapi32" _
Alias "GetUserNameA" _
(ByVal lpBuffer As String, _
nSize As Long) As Long
Private Declare Function GetComputerName Lib "kernel32" _
Alias "GetComputerNameA" _
(ByVal lpBuffer As String, _
nSize As Long) As Long
Private Declare Sub CopyMemory Lib "kernel32" _
Alias "RtlMoveMemory" _
(xDest As Any, _
xSource As Any, _
ByVal nBytes As Long)
Private Declare Function lstrlenW Lib "kernel32" _
(ByVal lpString As Long) As Long
Private Declare Function StrLen Lib "kernel32" _
Alias "lstrlenW" _
(ByVal lpString As Long) As Long
Private Sub Form_Load()
Dim tmp As String
Dim bServername() As Byte
tmp = rgbGetComputerName()
'assure the server string is properly formatted
If Len(tmp) Then
If InStr(tmp, "\\") Then
bServername = tmp & Chr$(0)
Else: bServername = "\\" & tmp & Chr$(0)
End If
End If
Text1.Text = tmp
Call GetUserEnumInfo(bServername())
End Sub
Private Function GetUserEnumInfo(bServername() As Byte)
Dim users() As Long
Dim buff As Long
Dim buffsize As Long
Dim entriesread As Long
Dim totalentries As Long
Dim cnt As Integer
buffsize = 255
If NetUserEnum(bServername(0), 0, _
FILTER_NORMAL_ACCOUNT, _
buff, buffsize, _
entriesread, _
totalentries, 0&) = ERROR_SUCCESS Then
ReDim users(0 To entriesread - 1) As Long
CopyMemory users(0), ByVal buff, entriesread * 4
For cnt = 0 To entriesread - 1
List1.AddItem GetPointerToByteStringW(users(cnt))
Next cnt
NetApiBufferFree buff
End If
End Function
Private Function rgbGetComputerName() As String
'returns the name of the computer
Dim tmp As String
tmp = Space$(MAX_COMPUTERNAME + 1)
If GetComputerName(tmp, Len(tmp)) <> 0 Then
rgbGetComputerName = TrimNull(tmp)
End If
End Function
Private Function TrimNull(item As String)
Dim pos As Integer
pos = InStr(item, Chr$(0))
If pos Then
TrimNull = Left$(item, pos - 1)
Else: TrimNull = item
End If
End Function
Private Function GetUserNetworkInfo(bServername() As Byte, bUsername() As Byte) As USER_INFO
Dim usrapi As USER_INFO_10
Dim buff As Long
If NetUserGetInfo(bServername(0), bUsername(0), 10, buff) = ERROR_SUCCESS Then
'copy the data from buff into the
'API user_10 structure
CopyMemory usrapi, ByVal buff, Len(usrapi)
'extract each member and return
'as members of the UDT
GetUserNetworkInfo.name = GetPointerToByteStringW(usrapi.usr10_name)
GetUserNetworkInfo.full_name = GetPointerToByteStringW(usrapi.usr10_full_name)
GetUserNetworkInfo.comment = GetPointerToByteStringW(usrapi.usr10_comment)
GetUserNetworkInfo.usr_comment = GetPointerToByteStringW(usrapi.usr10_usr_comment)
NetApiBufferFree buff
End If
End Function
Private Function GetPointerToByteStringW(lpString As Long) As String
Dim buff() As Byte
Dim nSize As Long
If lpString Then
'its Unicode, so mult. by 2
nSize = lstrlenW(lpString) * 2
If nSize Then
ReDim buff(0 To (nSize - 1)) As Byte
CopyMemory buff(0), ByVal lpString, nSize
GetPointerToByteStringW = buff
End If
End If
End Function
Private Sub List1_Click()
Dim usr As USER_INFO
Dim bUsername() As Byte
Dim bServername() As Byte
Dim tmp As String
'This assures that both the server
'and user params have data
If Len(Text1.Text) And List1.ListIndex > -1 Then
bUsername = List1.List(List1.ListIndex) & Chr$(0)
'This demo uses the current machine as the
'server param, which works on NT4 and Win2000.
'If connected to a PDC or BDC, pass that
'name as the server, instead of the return
'value from GetComputerName().
tmp = Text1.Text
'assure the server string is properly formatted
If Len(tmp) Then
If InStr(tmp, "\\") Then
bServername = tmp & Chr$(0)
Else: bServername = "\\" & tmp & Chr$(0)
End If
End If
'Return the user information for the passed
'user. The return values are assigned directly
'to the non-API USER_INFO data type that we
'defined (I prefer UDTs). Alternatively, if
'you're a 'classy' sort of guy, the return
'values could be assigned directly to properties
'in the function.
usr = GetUserNetworkInfo(bServername(), bUsername())
Text3.Text = usr.name
'The call may or may not return the
'full name, comment or usr_comment
'members, depending on the user's
'listing in User Manager.
Text4.Text = usr.full_name
Text5.Text = usr.comment
Text6.Text = usr.usr_comment
End If
End Sub
'--end block--
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