Attribute VB_Name = "modPowerOff"
Option Explicit
'***************
'*Shutdown part*
'***************
Public Const EWX_LOGOFF = 0 'fa il LOG-OFF dell'utente
Public Const EWX_SHUTDOWN = 1 'spenge il PC non completamente (con la schermata "Ora č possibile spegnere il computer")
Public Const EWX_REBOOT = 2 'riavvia il PC
Public Const EWX_FORCE = 4 'forza lo spengimento (puņ causare perdita di dati)
Public Const EWX_POWEROFF = 8 'spenge completamente il PC (se la scheda madre lo permette)
'The ExitWindowsEx function either logs off, shutsdown, or shutsdown and restarts the system.
Public Declare Function ExitWindowsEx Lib "user32" (ByVal dwOptions As Long, ByVal dwReserved As Long) As Long
'The GetLastError function returns the calling thread's last-error code value. The last-error code is maintained on a per-thread basis.
'Multiple threads do not overwrite each other's last-error code.
Public GetLasrError As Long
Public Declare Function GetLastError Lib "kernel32" () As Long
'OS constants
Public Const mlngWindows95 = 0
Public Const mlngWindowsNT = 1
Public glngWhichWindows32 As Long
'The GetVersion function returns the operating system in use.
Public Declare Function GetVersion Lib "kernel32" () As Long
Public Type LUID
UsedPart As Long
IgnoredForNowHigh32BitPart As Long
End Type
Public Type LUID_AND_ATTRIBUTES
TheLuid As LUID
Attributes As Long
End Type
Public Type TOKEN_PRIVILEGES
PrivilegeCount As Long
TheLuid As LUID
Attributes As Long
End Type
'The GetCurrentProcess function returns a pseudohandle for the current process.
Public Declare Function GetCurrentProcess Lib "kernel32" () As Long
'The OpenProcessToken function opens the access token associated with a process.
Public Declare Function OpenProcessToken Lib "advapi32" (ByVal ProcessHandle As Long, ByVal DesiredAccess As Long, TokenHandle As Long) As Long
'The LookupPrivilegeValue function retrieves the locally unique identifier (LUID) used on a specified system to locally represent the specified privilege name.
Public Declare Function LookupPrivilegeValue Lib "advapi32" Alias "LookupPrivilegeValueA" (ByVal lpSystemName As String, ByVal lpName As String, lpLuid As LUID) As Long
'The AdjustTokenPrivileges function enables or disables privileges in the specified access token. Enabling or disabling privileges in an access token requires TOKEN_ADJUST_PRIVILEGES access.
Public Declare Function AdjustTokenPrivileges Lib "advapi32" (ByVal TokenHandle As Long, ByVal DisableAllPrivileges As Long, NewState As TOKEN_PRIVILEGES, ByVal BufferLength As Long, PreviousState As TOKEN_PRIVILEGES, ReturnLength As Long) As Long
Public Declare Sub SetLastError Lib "kernel32" (ByVal dwErrCode As Long)
'******************************************************
'*This procedure sets the proper privileges to allow a*
'*log off or a shutdown to occur under Windows NT. *
'******************************************************
Public Sub AdjustToken()
Const TOKEN_ADJUST_PRIVILEGES = &H20
Const TOKEN_QUERY = &H8
Const SE_PRIVILEGE_ENABLED = &H2
Dim hdlProcessHandle, hdlTokenHandle, lBufferNeeded As Long
Dim tmpLuid As LUID
Dim tkp As TOKEN_PRIVILEGES
Dim tkpNewButIgnored As TOKEN_PRIVILEGES
'Set the error code of the last thread to zero using the SetLast Error function. Do this so that the GetLastError function does not return a value other than zero for no apparent reason.
SetLastError 0
'Use the GetCurrentProcess function to set the hdlProcessHandle variable.
hdlProcessHandle = GetCurrentProcess()
If GetLastError <> 0 Then MsgBox "GetCurrentProcess error==" & GetLastError
OpenProcessToken hdlProcessHandle, (TOKEN_ADJUST_PRIVILEGES Or TOKEN_QUERY), hdlTokenHandle
If GetLastError <> 0 Then MsgBox "OpenProcessToken error==" & GetLastError
'Get the LUID for shutdown privilege.
LookupPrivilegeValue "", "SeShutdownPrivilege", tmpLuid
If GetLastError <> 0 Then MsgBox "LookupPrivilegeValue error==" & GetLastError
tkp.PrivilegeCount = 1 ' One privilege to set.
tkp.TheLuid = tmpLuid
tkp.Attributes = SE_PRIVILEGE_ENABLED
'Enable the shutdown privilege in the access token of this process.
AdjustTokenPrivileges hdlTokenHandle, False, tkp, Len(tkpNewButIgnored), tkpNewButIgnored, lBufferNeeded
If GetLastError <> 0 Then MsgBox "AdjustTokenPrivileges error==" & GetLastError
End Sub