Enumerate Domain or Local Users
Just like the title says, this will enumerate a list of users either on the local machine or one a Windows domain.
Module
Option Explicit
'API types
Private Type USER_INFO
Name As String
Comment As String
UserComment As String
FullName As String
End Type
Private Type USER_INFO_API
Name As Long
Comment As Long
UserComment As Long
FullName As Long
End Type
Public UserInfo(0 To 1000) As USER_INFO
'API calls
Private Declare Function NetUserEnum Lib "netapi32.dll" (lpServer As Any, ByVal Level As Long, ByVal Filter As Long, lpBuffer As Long, ByVal PrefMaxLen As Long, EntriesRead As Long, TotalEntries As Long, ResumeHandle As Long) As Long
Private Declare Function NetApiBufferFree Lib "netapi32.dll" (ByVal pBuffer As Long) As Long
Private Declare Sub CopyMem Lib "kernel32.dll" Alias "RtlMoveMemory" (pTo As Any, uFrom As Any, ByVal lSize As Long)
Private Declare Function lstrlenW Lib "kernel32.dll" (ByVal lpString As Long) As Long
'API Constants
Private Const NERR_Success As Long = 0&
Private Const ERROR_MORE_DATA As Long = 234&
Private Const FILTER_TEMP_DUPLICATE_ACCOUNT As Long = &H1&
Private Const FILTER_NORMAL_ACCOUNT As Long = &H2&
Private Const FILTER_PROXY_ACCOUNT As Long = &H4&
Private Const FILTER_INTERDOMAIN_TRUST_ACCOUNT As Long = &H8&
Private Const FILTER_WORKSTATION_TRUST_ACCOUNT As Long = &H10&
Private Const FILTER_SERVER_TRUST_ACCOUNT As Long = &H20&
Private Function PtrToString(lpwString As Long) As String
'Convert a LPWSTR pointer to a VB string
Dim Buffer() As Byte
Dim nLen As Long
If lpwString Then
nLen = lstrlenW(lpwString) * 2
If nLen Then
ReDim Buffer(0 To (nLen - 1)) As Byte
CopyMem Buffer(0), ByVal lpwString, nLen
PtrToString = Buffer
End If
End If
End Function
Public Function GetUsers(ServerName As String) As Long
Dim lpBuffer As Long
Dim nRet As Long
Dim EntriesRead As Long
Dim TotalEntries As Long
Dim ResumeHandle As Long
Dim uUser As USER_INFO_API
Dim bServer() As Byte
Dim i As Integer
If Trim(ServerName) = "" Then
'Local users
bServer = vbNullString
Else
'Check the syntax of the ServerName string
If InStr(ServerName, "\\") = 1 Then
bServer = ServerName & vbNullChar
Else
bServer = "\\" & ServerName & vbNullChar
End If
End If
i = 0
ResumeHandle = 0
Do
'Start to enumerate the Users
If Trim(ServerName) = "" Then
nRet = NetUserEnum(vbNullString, 10, FILTER_NORMAL_ACCOUNT, lpBuffer, 1, EntriesRead, TotalEntries, ResumeHandle)
Else
nRet = NetUserEnum(bServer(0), 10, FILTER_NORMAL_ACCOUNT, lpBuffer, 1, EntriesRead, TotalEntries, ResumeHandle)
End If
'Fill the data structure for the User
If nRet = ERROR_MORE_DATA Then
CopyMem uUser, ByVal lpBuffer, Len(uUser)
UserInfo(i).Name = PtrToString(uUser.Name)
UserInfo(i).Comment = PtrToString(uUser.Comment)
UserInfo(i).UserComment = PtrToString(uUser.UserComment)
UserInfo(i).FullName = PtrToString(uUser.FullName)
i = i + 1
End If
If lpBuffer Then
Call NetApiBufferFree(lpBuffer)
End If
Loop While nRet = ERROR_MORE_DATA
'Return the number of Users
GetUsers = i
End Function
Usage
Create a Form with a Command Button and a ListBox.
Private Sub Command1_Click()
Dim i As Integer
Dim NumUsers As Integer
NumUsers = GetUsers("\\MYDOMAINSERVER")'For local users use "" as Server Parameter
'Fill the List
List1.Clear
For i = 0 To NumUsers - 1
List1.AddItem UserInfo(i).Name
Next
End Sub
Special Instructions
This code originally appeared on AndreaVB.com, and has been republished here with the permission of Andrea Tincani.
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