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Programming Windows NT with Visual Basic

  • November 19, 2002
  • By Sam Huggill
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To create the class module, start a new Standard EXE Project and click Project, Add Class Module. Rename the class module CNetworkNT and copy/paste the following code into it:

Option Explicit
' ---------------------------------------------
' API calls
' ---------------------------------------------

Private Declare Function NetUserAdd _
Lib "netapi32.dll" (ServerName As Byte, _
ByVal Level As Long, Buffer As USER_INFO_3, _
parm_err As Long) As Long

Private Declare Function NetApiBufferAllocate _
Lib "netapi32.dll" (ByVal ByteCount As Long, _
Ptr As Long) As Long

Private Declare Function NetApiBufferFree Lib _
"Netapi32" (ByVal pBuffer As Long) As Long

Private Declare Function NetGetDCName Lib _
"netapi32.dll" (ByVal sServerName As String, _
ByVal sDomainName As String, ByVal lPtr As _
Long) As Long

Private Declare Function lstrcpyW Lib _
"kernel32.dll" (bRet As Byte, ByVal _
lPtr As Long) As Long

Private Declare Function NetLocalGroupAddMembers _
Lib "Netapi32" (ByVal psServer As Long, ByVal _
psLocalGroupName As Long, ByVal Level As Long, _
pPtrBuffer As Long, ByVal membercount As Long) As Long

Private Declare Function NetServerSetInfo Lib _
"Netapi32" (sServerName As Byte, ByVal lLevel _
As Long, vBuffer As Long, ParmError As Long) As Long

Private Declare Function LogonUser Lib "Advapi32" _
Alias "LogonUserA" (ByVal lpszUsername As String, _
ByVal lpszDomain As Any, ByVal lpszPassword As String, _
ByVal dwLogonType As Long, ByVal dwLogonProvider As _
Long, phToken As Long) As Long

Private Declare Sub CopyMem Lib "kernel32" Alias _
"RtlMoveMemory" (pTo As Any, uFrom As Any, ByVal _
lSize As Long)

Private Declare Function StrLenA Lib "kernel32" Alias _
"lstrlenA" (ByVal Ptr As Long) As Long

Private Declare Function StrCopyA Lib "kernel32" Alias _
"lstrcpyA" (ByVal RetVal As String, ByVal Ptr As Long) As Long

Private Declare Function WNetOpenEnum Lib "mpr.dll" Alias _
"WNetOpenEnumA" (ByVal dwScope As Long, ByVal dwType As Long, _
ByVal dwUsage As Long, lpNetResource As Any, lppEnumHwnd _
As Long) As Long

Private Declare Function WNetEnumResource Lib "mpr.dll" Alias _
"WNetEnumResourceA" (ByVal pEnumHwnd As Long, lpcCount As Long, _
lpBuffer As NETRESOURCE, lpBufferSize As Long) As Long

Private Declare Function WNetCloseEnum Lib "mpr.dll" (ByVal _
p_lngEnumHwnd As Long) As Long

Private Declare Function NetUserGetInfo Lib "netapi32.dll" _
(ServerName As Byte, Username As Byte, ByVal Level As Long, _
Buffer As Long) As Long

Private Declare Function NetUserEnum Lib "netapi32.dll" _
(ServerName As Byte, ByVal Level As Long, ByVal Filter _
As Long, Buffer As Long, ByVal PrefMaxLen As Long, _
EntriesRead As Long, TotalEntries As Long, ResumeHwnd _
As Long) As Long

Private Declare Function StrLenW Lib "kernel32" Alias _
"lstrlenW" (ByVal Ptr As Long) As Long

Private Declare Function NetUserChangePassword Lib _
"netapi32.dll" (ByVal domainname As String, ByVal _
Username As String, ByVal OldPassword As String, _
ByVal NewPassword As String) As Long

Private Declare Function NetUserSetInfo Lib "netapi32.dll" _
(ByVal ServerName As String, ByVal Username As String, ByVal _
Level As Long, UserInfo As Any, ParmError As Long) As Long

' ---------------------------------------------
' Possible errors with API call
' ---------------------------------------------

Private Const ERROR_ACCESS_DENIED As Long = 5
Private Const NERR_BASE As Long = 2100
Private Const NERR_GroupExists As Long = NERR_BASE + 123
Private Const NERR_NotPrimary As Long = NERR_BASE + 126
Private Const NERR_UserExists As Long = NERR_BASE + 124
Private Const NERR_PasswordTooShort As Long = NERR_BASE + 145
Private Const NERR_InvalidComputer As Long = NERR_BASE + 251
Private Const NERR_Success As Long = 0&

' ---------------------------------------------
' General constants used
' ---------------------------------------------

Private Const constUserInfoLevel3 As Long = 3
Private Const TIMEQ_FOREVER As Long = -1&
Private Const MAX_PATH As Long = 260&
Private Const DOMAIN_GROUP_RID_USERS As Long = &H201&
Private Const USER_MAXSTORAGE_UNLIMITED As Long = -1&
Private Const LocalGroupMembersInfo3 As Long = 3&
Private Const MAX_RESOURCES As Long = 256
Private Const NOT_A_CONTAINER As Long = -1
Private Const RESOURCE_GLOBALNET As Long = &H2&
Private Const RESOURCETYPE_ANY As Long = &H0&
Private Const RESOURCEUSAGE_ALL As Long = &H0&
Private Const NO_ERROR As Long = 0&
Private Const RESOURCE_ENUM_ALL As Long = &HFFFF

' ---------------------------------------------
' Constants used by LogonUser
' ---------------------------------------------

Private Const LOGON32_PROVIDER_DEFAULT As Long = 0&
Private Const LOGON32_PROVIDER_WINNT35 As Long = 1&
Private Const LOGON32_LOGON_INTERACTIVE As Long = 2&
Private Const LOGON32_LOGON_NETWORK As Long = 3&
Private Const LOGON32_LOGON_BATCH As Long = 4&
Private Const LOGON32_LOGON_SERVICE As Long = 5&

' ---------------------------------------------
' Used by usri3_flags element of data structure
' ---------------------------------------------

Private Const UF_SCRIPT As Long = &H1&
Private Const UF_ACCOUNTDISABLE As Long = &H2&
Private Const UF_HOMEDIR_REQUIRED As Long = &H8&
Private Const UF_LOCKOUT As Long = &H10&
Private Const UF_PASSWD_NOTREQD As Long = &H20&
Private Const UF_PASSWD_CANT_CHANGE As Long = &H40&
Private Const UF_DONT_EXPIRE_PASSWD As Long = &H10000
Private Const STILL_ACTIVE As Long = &H103&
Private Const UF_NORMAL_ACCOUNT As Long = &H200&
Private Const UF_SERVER_TRUST_ACCOUNT As Long = &H2000&
Private Const PROCESS_QUERY_INFORMATION As Long = &H400&
Private Const UF_TEMP_DUPLICATE_ACCOUNT As Long = &H100&
Private Const UF_INTERDOMAIN_TRUST_ACCOUNT As Long = &H800&
Private Const UF_WORKSTATION_TRUST_ACCOUNT As Long = &H1000&

' ---------------------------------------------
' The USER_INFO_3 data structure
' ---------------------------------------------

Private Type USER_INFO_3
  usri3_name As Long
  usri3_password As Long
  usri3_password_age As Long
  usri3_priv As Long
  usri3_home_dir As Long
  usri3_comment As Long
  usri3_flags As Long
  usri3_script_path As Long
  usri3_auth_flags As Long
  usri3_full_name As Long
  usri3_usr_comment As Long
  usri3_parms As Long
  usri3_workstations As Long
  usri3_last_logon As Long
  usri3_last_logoff As Long
  usri3_acct_expires As Long
  usri3_max_storage As Long
  usri3_units_per_week As Long
  usri3_logon_hours As Long
  usri3_bad_pw_count As Long
  usri3_num_logons As Long
  usri3_logon_server As Long
  usri3_country_code As Long
  usri3_code_page As Long
  usri3_user_id As Long
  usri3_primary_group_id As Long
  usri3_profile As Long
  usri3_home_dir_drive As Long
  usri3_password_expired As Long
End Type

Private Type USERINFO_2_API
  usri2_name As Long
  usri2_password As Long
  usri2_password_age As Long
  usri2_priv As Long
  usri2_home_dir As Long
  usri2_comment As Long
  usri2_flags As Long
  usri2_script_path As Long
  usri2_auth_flags As Long
  usri2_full_name As Long
  usri2_usr_comment As Long
  usri2_parms As Long
  usri2_workstations As Long
  usri2_last_logon As Long
  usri2_last_logoff As Long
  usri2_acct_expires As Long
  usri2_max_storage As Long
  usri2_units_per_week As Long
  usri2_logon_hours As Long
  usri2_bad_pw_count As Long
  usri2_num_logons As Long
  usri2_logon_server As Long
  usri2_country_code As Long
  usri2_code_page As Long
End Type

Private Type USER_INFO_10_API
  Name As Long
  Comment As Long
  UsrComment As Long
  FullName As Long
End Type

Private Type USER_INFO_1003
  usri1003_password As Long
End Type

Private Type LOCALGROUP_MEMBERS_INFO_3
  DomainAndName As Long
End Type

' Type used by NetServerSetInfo

Private Type SERVER_INFO_1005
  sv1005_comment As Long
End Type

Private Type NETRESOURCE
  dwScope As Long
  dwType As Long
  dwDisplayType As Long
  dwUsage As Long
  pLocalName As Long
  pRemoteName As Long
  pComment As Long
  pProvider As Long
End Type
' *******************************************************
' Add a user either to NT -- you *MUST* have admin or
' account operator priviledges to successfully run
' this function
' Use on NT Only
' *******************************************************

Public Function AddUser(ByVal xi_strServerName As String, _
BVal xi_strUserName As String, ByVal xi_strPassword As String, _
Optional ByVal xi_strUserFullName As String = vbNullString, _
Optional ByVal xi_strUserComment As String = vbNullString) _
As Boolean

Dim p_strErr As String
Dim p_lngRtn As Long
Dim p_lngPtrUserName As Long
Dim p_lngPtrPassword As Long
Dim p_lngPtrUserFullName As Long
Dim p_lngPtrUserComment As Long
Dim p_lngParameterErr As Long
Dim p_lngFlags As Long
Dim p_abytServerName() As Byte
Dim p_abytUserName() As Byte
Dim p_abytPassword() As Byte
Dim p_abytUserFullName() As Byte
Dim p_abytUserComment() As Byte
Dim p_typUserInfo3 As USER_INFO_3
 
If xi_strUserFullName = vbNullString Then
  xi_strUserName = xi_strUserName
End If

' ------------------------------------------
' Create byte arrays to avoid Unicode hassles
' ------------------------------------------

p_abytServerName = xi_strServerName & vbNullChar
p_abytUserName = xi_strUserName & vbNullChar
p_abytUserFullName = xi_strUserFullName & vbNullChar
p_abytPassword = xi_strPassword & vbNullChar
p_abytUserComment = xi_strUserComment & vbNullChar

' ------------------------------------------
' Allocate buffer space
' ------------------------------------------

p_lngRtn = NetApiBufferAllocate(UBound(p_abytUserName),
p_lngPtrUserName)

p_lngRtn = NetApiBufferAllocate(UBound(p_abytUserFullName),
p_lngPtrUserFullName)

p_lngRtn = NetApiBufferAllocate(UBound(p_abytPassword),
p_lngPtrPassword)

p_lngRtn = NetApiBufferAllocate(UBound(p_abytUserComment),
p_lngPtrUserComment)

' ------------------------------------------
' Get pointers to the byte arrays
' ------------------------------------------

p_lngPtrUserName = VarPtr(p_abytUserName(0))
p_lngPtrUserFullName = VarPtr(p_abytUserFullName(0))
p_lngPtrPassword = VarPtr(p_abytPassword(0))
p_lngPtrUserComment = VarPtr(p_abytUserComment(0))

' ------------------------------------------
' Fill the VB structure
' ------------------------------------------

p_lngFlags = UF_NORMAL_ACCOUNT Or _
UF_SCRIPT Or _
UF_DONT_EXPIRE_PASSWD

With p_typUserInfo3
  .usri3_acct_expires = TIMEQ_FOREVER ' Never expires
  .usri3_comment = p_lngPtrUserComment ' Comment
  .usri3_flags = p_lngFlags ' There are a number of variations
  .usri3_full_name = p_lngPtrUserFullName ' User's full name
  .usri3_max_storage = USER_MAXSTORAGE_UNLIMITED ' Can use any amount
  'of disk space
  .usri3_name = p_lngPtrUserName ' Name of user account
  .usri3_password = p_lngPtrPassword ' Password for user account
  .usri3_primary_group_id = DOMAIN_GROUP_RID_USERS ' You MUST use this
  'constant for NetUserAdd
  .usri3_script_path = 0& ' Path of user's logon script
  .usri3_auth_flags = 0& ' Ignored by NetUserAdd
  .usri3_bad_pw_count = 0& ' Ignored by NetUserAdd
  .usri3_code_page = 0& ' Code page for user's language
  .usri3_country_code = 0& ' Country code for user's language
  .usri3_home_dir = 0& ' Can specify path of home directory of this
  'user
  .usri3_home_dir_drive = 0& ' Drive letter assign to user's
  'profile
  .usri3_last_logoff = 0& ' Not needed when adding a user
  .usri3_last_logon = 0& ' Ignored by NetUserAdd
  .usri3_logon_hours = 0& ' Null means no restrictions
  .usri3_logon_server = 0& ' Null means logon to domain server
  .usri3_num_logons = 0& ' Ignored by NetUserAdd
  .usri3_parms = 0& ' Used by specific applications
  .usri3_password_age = 0& ' Ignored by NetUserAdd
  .usri3_password_expired = 0& ' None-zero means user must change
  'password at next logon
  .usri3_priv = 0& ' Ignored by NetUserAdd
  .usri3_profile = 0& ' Path to a user's profile
  .usri3_units_per_week = 0& ' Ignored by NetUserAdd
  .usri3_user_id = 0& ' Ignored by NetUserAdd
  .usri3_usr_comment = 0& ' User comment
  .usri3_workstations = 0& ' Workstations a user can log onto (null
  '= all stations)
End With

' ------------------------------------------
' Attempt to add the user
' ------------------------------------------

p_lngRtn = NetUserAdd(p_abytServerName(0), _
constUserInfoLevel3, p_typUserInfo3, p_lngParameterErr)

' ------------------------------------------
' Check for error
' ------------------------------------------

If p_lngRtn <> 0 Then
  AddUser = False
  Select Case p_lngRtn
  Case ERROR_ACCESS_DENIED
  p_strErr = "User doesn't have sufficient access rights."
  Case NERR_GroupExists
  p_strErr = "The group already exists."
  Case NERR_NotPrimary
  p_strErr = "Can only do this operation on the PDC of the domain."
  Case NERR_UserExists
  p_strErr = "The user account already exists."
  Case NERR_PasswordTooShort
  p_strErr = "The password is shorter than required."
  Case NERR_InvalidComputer
  p_strErr = "The computer name is invalid."
  Case Else
  p_strErr = "Unknown error #" & CStr(p_lngRtn)
  End Select
  On Error GoTo 0
  Err.Raise Number:=p_lngRtn, _
  Description:=p_strErr & vbCrLf & _
  "Error in parameter " & p_lngParameterErr & _
  " when attempting to add the user, " & xi_strUserName, _
  Source:="Form1.AddUser"
Else
  AddUser = True
End If

' ------------------------------------------
' Be a good programmer and free the memory
' you've allocated
' ------------------------------------------

p_lngRtn = NetApiBufferFree(p_lngPtrUserName)
p_lngRtn = NetApiBufferFree(p_lngPtrPassword)
p_lngRtn = NetApiBufferFree(p_lngPtrUserFullName)
p_lngRtn = NetApiBufferFree(p_lngPtrUserComment)

End Function

' Works only on Win NT
Public Function GetPrimaryDCName(ByVal DName As String) As String

Dim DCName As String, DCNPtr As Long
Dim DNArray() As Byte, DCNArray(100) As Byte
Dim result As Long
DNArray = DName & vbNullChar
' Lookup the Primary Domain Controller
result = NetGetDCName(0&, DNArray(0), DCNPtr)

If result <> 0 Then
  Err.Raise vbObjectError + 4000, "CNetworkInfo", result
  Exit Function
End If
 
lstrcpyW DCNArray(0), DCNPtr
result = NetApiBufferFree(DCNPtr)
DCName = DCNArray()
 
GetPrimaryDCName = Left(DCName, InStr(DCName, Chr(0)) - 1)

End Function

' Use on NT Only
Public Function AddUserToLocal(ByVal xi_strGroupName As String, _
ByVal xi_strUserName As String, _
ByVal xi_strServerName As String) As Boolean
 
Dim p_lngPtrGroupName As Long
Dim p_lngPtrUserName As Long
Dim p_lngPtrServerName As Long
Dim p_lngMemberCount As Long
Dim p_lngRtn As Long
 
' Convert the server name to a pointer
If Len(Trim$(xi_strServerName)) = 0 Then
  p_lngPtrServerName = 0&
Else
  p_lngPtrServerName = StrPtr(xi_strServerName)
End If

' Convert the group name to a pointer
p_lngPtrGroupName = StrPtr(xi_strGroupName)
 
' Convert the user name to a pointer
p_lngPtrUserName = StrPtr(xi_strUserName)
 
' Add the user
p_lngMemberCount = 1
 
p_lngRtn = NetLocalGroupAddMembers(p_lngPtrServerName, _
p_lngPtrGroupName, _
LocalGroupMembersInfo3, _
p_lngPtrUserName, _
p_lngMemberCount)
 
If p_lngRtn = NERR_Success Then
  AddUserToLocal = True
Else
  AddUserToLocal = False
End If
 
End Function
 
' Works on Win 95 & NT
Public Function SetServerInfo(ByVal xi_strComment As String, _
Optional ByVal xi_strServerName As String = "") As Boolean
Dim p_bytServerName() As Byte
Dim p_lngRtn As Long
Dim p_lngSrvInfoRtn As Long
Dim p_lngServEnumLevel As Long
Dim p_lngParmError As Long
Dim p_lngStrPtr As Long
 
' Initialize the variables
If Trim$(xi_strServerName) = vbNullString Then
  p_bytServerName = vbNullChar
Else
  p_bytServerName = Trim$(xi_strServerName) & vbNullChar
End If

p_lngServEnumLevel = 1005
p_lngStrPtr = StrPtr(xi_strComment)
p_lngRtn = NetServerSetInfo(sServerName:=p_bytServerName(0), _
lLevel:=p_lngServEnumLevel, _
vBuffer:=p_lngStrPtr, _
ParmError:=p_lngParmError)
 
If p_lngRtn = 0 Then
  SetServerInfo = True
Else
  SetServerInfo = False
  Debug.Print Err.LastDllError
End If
 
End Function

' Works on Win 95 & NT
Public Function Login(ByVal xi_strUserID As String, _
ByVal xi_strPassword As String) As Boolean

On Error Resume Next ' Don't accept errors here

Dim p_lngToken As Long
Dim p_lngRtn As Long
 
p_lngRtn = LogonUser(lpszUsername:=xi_strUserID, _
lpszDomain:=0&, _
lpszPassword:=xi_strPassword, _
dwLogonType:=LOGON32_LOGON_NETWORK, _
dwLogonProvider:=LOGON32_PROVIDER_DEFAULT, _
phToken:=p_lngToken)
 
If p_lngRtn = 0 Then
  Login = False
Else
  Login = True
End If

On Error GoTo 0

End Function


Private Function EnumDomains() As Variant

Dim p_lngRtn As Long
Dim p_lngEnumHwnd As Long
Dim p_lngCount As Long
Dim p_lngLoop As Long
Dim p_lngBufSize As Long
Dim p_astrDomainNames() As String
Dim p_atypNetAPI(0 To MAX_RESOURCES) As NETRESOURCE
 
' ------------------------------------------
' First time thru, we are just getting the root level
' ------------------------------------------
p_lngEnumHwnd = 0&
p_lngRtn = WNetOpenEnum(dwScope:=RESOURCE_GLOBALNET, _
dwType:=RESOURCETYPE_ANY, _
dwUsage:=RESOURCEUSAGE_ALL, _
lpNetResource:=ByVal 0&, _
lppEnumHwnd:=p_lngEnumHwnd)
 
If p_lngRtn = NO_ERROR Then
p_lngCount = RESOURCE_ENUM_ALL
 
p_lngBufSize = UBound(p_atypNetAPI) * Len(p_atypNetAPI(0))
p_lngRtn = WNetEnumResource(pEnumHwnd:=p_lngEnumHwnd, _
lpcCount:=p_lngCount, _
lpBuffer:=p_atypNetAPI(0), _
lpBufferSize:=p_lngBufSize)
 
If p_lngCount > 0 Then
  For p_lngLoop = 0 To p_lngCount - 1
  Debug.Print PointerToAsciiStr(p_atypNetAPI(p_lngLoop).pRemoteName)
  Next p_lngLoop
End If

End If
 
If p_lngEnumHwnd <> 0 Then
  Call WNetCloseEnum(p_lngEnumHwnd)
End If

' ------------------------------------------
' Now we are going for the second level,
' which should contain the domain names
' ------------------------------------------
p_lngRtn = WNetOpenEnum(dwScope:=RESOURCE_GLOBALNET, _
dwType:=RESOURCETYPE_ANY, _
dwUsage:=RESOURCEUSAGE_ALL, _
lpNetResource:=p_atypNetAPI(0), _
lppEnumHwnd:=p_lngEnumHwnd)
 
If p_lngRtn = NO_ERROR Then
  p_lngCount = RESOURCE_ENUM_ALL
 
  p_lngBufSize = UBound(p_atypNetAPI) * Len(p_atypNetAPI(0))
  p_lngRtn = WNetEnumResource(pEnumHwnd:=p_lngEnumHwnd, _
  lpcCount:=p_lngCount, _
  lpBuffer:=p_atypNetAPI(0), _
  lpBufferSize:=p_lngBufSize)
 
  If p_lngCount > 0 Then
    ReDim p_astrDomainNames(1 To p_lngCount) As String
    For p_lngLoop = 0 To p_lngCount - 1
    p_astrDomainNames(p_lngLoop + 1) =
    PointerToAsciiStr(p_atypNetAPI(p_lngLoop).pRemoteName)
    Next p_lngLoop
  End If
End If
 
If p_lngEnumHwnd <> 0 Then
  Call WNetCloseEnum(p_lngEnumHwnd)
End If

' ------------------------------------------
' Set the return value
' ------------------------------------------

EnumDomains = p_astrDomainNames
End Function


Private Function PointerToAsciiStr(ByVal xi_lngPtrToString As _
Long) As String

On Error Resume Next ' Don't accept an error here
Dim p_lngLen As Long
Dim p_strStringValue As String
Dim p_lngNullPos As Long
Dim p_lngRtn As Long
 
p_lngLen = StrLenA(xi_lngPtrToString)

If xi_lngPtrToString > 0 And p_lngLen > 0 Then
  p_strStringValue = Space$(p_lngLen + 1)
  p_lngRtn = StrCopyA(p_strStringValue, xi_lngPtrToString)
  p_lngNullPos = InStr(p_strStringValue, Chr$(0)
  If p_lngNullPos > 0 Then
    'Lose the null terminator...
    PointerToAsciiStr = Left$(p_strStringValue, p_lngNullPos - 1)
  Else
    PointerToAsciiStr = p_strStringValue 'Just pass the string...
  End If
Else
  PointerToAsciiStr = ""
End If

End Function


' Works on Win 95 & NT
Public Sub GetDomains(lst As Object)

Dim p_avntDomains As Variant
Dim p_lngLoop As Long
Dim p_lngNumItems As Long
 
p_avntDomains = EnumDomains()
 
On Error Resume Next
p_lngNumItems = UBound(p_avntDomains)
On Error GoTo 0
 
If p_lngNumItems > 0 Then
  For p_lngLoop = 1 To p_lngNumItems
  ' Debug.Print "Domain Name: " & p_avntDomains(p_lngLoop)
  lst.AddItem p_avntDomains(p_lngLoop)
  Next p_lngLoop
End If
 
End Sub



' Works on Win NT only
Public Function GetLoggedOnUsers(ByVal ServerName As _
String) As Variant

Dim p_lngRtn As Long
Dim p_lngPtrBuffer As Long
Dim p_lngPtrUserInfoBuf As Long
Dim p_lngEntriesRead As Long
Dim p_lngTotalEntries As Long
Dim p_lngResumeHwnd As Long
Dim p_lngLoop As Long
Dim p_lngLastLogon As Long
Dim p_lngLastLogoff As Long
Dim p_strUserName As String
Dim p_abytServerName() As Byte
Dim p_abytUserName() As Byte
Dim p_atypUserInfo() As USER_INFO_10_API
Dim p_typUserInfo As USERINFO_2_API
 
' ------------------------------------------
' Initialize the variable(s)
' ------------------------------------------

If ServerName = "" Then
  p_abytServerName = Chr$(0)
Else
  p_abytServerName = "\\" & ServerName & Chr$(0)
End If
 
' ------------------------------------------
' Make appropriate API call and check for error
' ------------------------------------------

p_lngRtn = NetUserEnum(ServerName:=p_abytServerName(0), _
Level:=10, _
Filter:=0&, _
Buffer:=p_lngPtrBuffer, _
PrefMaxLen:=&H4000, _
EntriesRead:=p_lngEntriesRead, _
TotalEntries:=p_lngTotalEntries, _
ResumeHwnd:=p_lngResumeHwnd)

If p_lngRtn <> 0 Then
  MsgBox "Had an error with NetUserEnum, " &
  CStr(p_lngRtn), _
  Buttons:=vbInformation, _
  Title:="GetLoggedOnUsers"
  Exit Function
End If

' ------------------------------------------
' Exit if no entries found
' ------------------------------------------

If p_lngEntriesRead < 1 Then
  Exit Function
End If
 
' ------------------------------------------
' Redim the type array to hold this info
' ------------------------------------------

ReDim p_atypUserInfo(0 To p_lngEntriesRead - 1)
 
' ------------------------------------------
' Copy the pointer to the buffer into the
' type array
' ------------------------------------------

CopyMem p_atypUserInfo(0), _
ByVal p_lngPtrBuffer, _
Len(p_atypUserInfo(0)) * p_lngEntriesRead

' ------------------------------------------
' Fill-in the info needed to call the
' Add() method
' NOTE: We will always have +1 open pipe,
' since in making this call we create
' a pipe, "\PIPE\srvsvc"
' ------------------------------------------
For p_lngLoop = 0 To p_lngEntriesRead - 1
p_strUserName = PointerToUnicodeStr(p_atypUserInfo(p_lngLoop).Name)
p_abytUserName = p_strUserName & Chr(0)
p_lngRtn = NetUserGetInfo(ServerName:=p_abytServerName(0), _
Username:=p_abytUserName(0), _
Level:=2, _
Buffer:=p_lngPtrUserInfoBuf)

If p_lngRtn <> 0 Then
  MsgBox "Had an error with NetUserGetInfo, " &
  CStr(p_lngRtn), _
  Buttons:=vbInformation, _
  Title:="GetLoggedOnUsers"
  Exit Function
End If
 
CopyMem p_typUserInfo, _
ByVal p_lngPtrUserInfoBuf, _
Len(p_typUserInfo)
 
p_lngLastLogon = p_typUserInfo.usri2_last_logon
p_lngLastLogoff = p_typUserInfo.usri2_last_logoff
 
If p_lngLastLogoff = 0 And p_lngLastLogon = 0 Then
MsgBox " **** " & p_strUserName & " has NEVER logged in"
ElseIf (p_lngLastLogoff 

		
< p_lngLastLogon) Then
MsgBox p_strUserName & " is still logged in -- " &
p_lngLastLogoff, p_lngLastLogon
Else
MsgBox " **** " & p_strUserName & " is NOT logged in"
End If
 
If p_lngPtrUserInfoBuf <> 0 Then
NetApiBufferFree p_lngPtrUserInfoBuf
End If
 
Next p_lngLoop
 
' ------------------------------------------
' Clean-up the buffer
' ------------------------------------------

If p_lngPtrBuffer <> 0 Then
  NetApiBufferFree p_lngPtrBuffer
End If

End Function



Private Function PointerToUnicodeStr(lpUnicodeStr As Long) As String

On Error Resume Next ' Don't accept an error here

Dim Buffer() As Byte
Dim nLen As Long
 
If lpUnicodeStr Then
nLen = StrLenW(lpUnicodeStr) * 2
If nLen Then
ReDim Buffer(0 To (nLen - 1)) As Byte
 
' ------------------------------------
' Copy the pointer to the buffer into
' the type array
' ------------------------------------
CopyMem Buffer(0), ByVal lpUnicodeStr, nLen
PointerToUnicodeStr = Buffer

End If

End If

End Function



' Use on NT Only
Public Function ChangePassword(strUserName As String, _
strDomain As String, strOldPwl As String, _
strNewPwl As String) As Boolean
 
Dim sServer As String, sUser As String
Dim sNewPass As String, sOldPass As String
Dim UI1003 As USER_INFO_1003
Dim dwLevel As Long
Dim lRet As String
Dim sNew As String
 
' StrConv Functions are necessary since VB will perform
' UNICODE/ANSI translation before passing strings to the 
' NETAPI functions
 
sUser = StrConv(strUserName, vbUnicode)
sNewPass = StrConv(strNewPwl, vbUnicode)
'See if this is Domain or Computer referenced

If Left(strDomain, 2) = "\\" Then
  sServer = StrConv(strDomain, vbUnicode)
Else
  ' Domain was referenced, get the Primary Domain Controller
  sServer = StrConv(GetPrimaryDCName(strDomain), vbUnicode)
End If
 
If strOldPwl = "" Then
  ' Administrative over-ride of existing password.
  ' Does not require old password
  dwLevel = 1003
  sNew = strNewPwl
  UI1003.usri1003_password = StrPtr(sNew)
  lRet = NetUserSetInfo(sServer, sUser, dwLevel, UI1003, 0&)
Else
  ' Set the Old Password and attempt to change the user's password
  sOldPass = StrConv(strOldPwl, vbUnicode)
  lRet = NetUserChangePassword(sServer, sUser, sOldPass, sNewPass)
End If
 
If lRet <> 0 Then
  ChangePassword = False
Else
  ChangePassword = True
End If

End Function




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