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Visual Basic / API / Shutdown win95/98/NT

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Added: 2002-04-28

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shuts down win9x/NT

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Declarations
Highlight AllOption Explicit Private Const EWX_LogOff As Long = 0 Private Const EWX_SHUTDOWN As Long = 1 Private Const EWX_REBOOT As Long = 2 Private Const EWX_FORCE As Long = 4 Private Const EWX_POWEROFF As Long = 8 'The ExitWindowsEx function either logs off, shuts down, or shuts 'down and restarts the system. Private 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. Private Declare Function GetLastError Lib "kernel32" () As Long Private Const mlngWindows95 = 0 Private Const mlngWindowsNT = 1 Public glngWhichWindows32 As Long 'The GetVersion function returns the operating system in use. Private Declare Function GetVersion Lib "kernel32" () As Long Private Type LUID UsedPart As Long IgnoredForNowHigh32BitPart As Long End Type Private Type LUID_AND_ATTRIBUTES TheLuid As LUID Attributes As Long End Type Private Type TOKEN_PRIVILEGES PrivilegeCount As Long TheLuid As LUID Attributes As Long End Type 'The GetCurrentProcess function returns a pseudohandle for the 'current process. Private Declare Function GetCurrentProcess Lib "kernel32" () As Long 'The OpenProcessToken function opens the access token associated with 'a process. Private 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. Private 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. Private 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 Private Declare Sub SetLastError Lib "kernel32" _ (ByVal dwErrCode As Long) Private Sub AdjustToken() '******************************************************************** '* This procedure sets the proper privileges to allow a log off or a '* shut down to occur under Windows NT. '******************************************************************** Const TOKEN_ADJUST_PRIVILEGES = &H20 Const TOKEN_QUERY = &H8 Const SE_PRIVILEGE_ENABLED = &H2 Dim hdlProcessHandle As Long Dim hdlTokenHandle As Long Dim tmpLuid As LUID Dim tkp As TOKEN_PRIVILEGES Dim tkpNewButIgnored As TOKEN_PRIVILEGES Dim lBufferNeeded As Long '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 systemMessage.AddItem "GetCurrentProcess Error==" & GetLastError End If OpenProcessToken hdlProcessHandle, _ (TOKEN_ADJUST_PRIVILEGES Or TOKEN_QUERY), hdlTokenHandle If GetLastError <> 0 Then systemMessage.AddItem "OpenProcessToken Error==" & GetLastError End If 'Get the LUID for shutdown privilege LookupPrivilegeValue "", "SeShutdownPrivilege", tmpLuid If GetLastError <> 0 Then systemMessage.AddItem "LookupPrivilegeValue Error==" & GetLastError End If 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 systemMessage.AddItem "AdjustTokenPrivileges Error==" & GetLastError End If End Sub
Code
Highlight AllPrivate Sub cmdLogoff_Click() ExitWindowsEx (EWX_LogOff), &HFFFF systemMessage.AddItem "ExitWindowsEx's GetLastError " & GetLastError End Sub Private Sub cmdForceLogoff_Click() ExitWindowsEx (EWX_LogOff Or EWX_FORCE), &HFFFF systemMessage.AddItem "ExitWindowsEx's GetLastError " & GetLastError End Sub Private Sub cmdShutdown_Click() If glngWhichWindows32 = mlngWindowsNT Then AdjustToken systemMessage.AddItem "Post-AdjustToken GetLastError " & GetLastError End If ExitWindowsEx (EWX_SHUTDOWN), &HFFFF systemMessage.AddItem "ExitWindowsEx's GetLastError " & GetLastError End Sub Private Sub cmdForceShutdown_Click() If glngWhichWindows32 = mlngWindowsNT Then AdjustToken systemMessage.AddItem "Post-AdjustToken GetLastError " & GetLastError End If ExitWindowsEx (EWX_SHUTDOWN Or EWX_FORCE), &HFFFF systemMessage.AddItem "ExitWindowsEx's GetLastError " & GetLastError End Sub Private Sub exit_Click() End End Sub Private Sub Form_Load() '******************************************************************** '* When the project starts, check the operating system used by '* calling the GetVersion function. '******************************************************************** Dim lngVersion As Long lngVersion = GetVersion() If ((lngVersion And &H80000000) = 0) Then glngWhichWindows32 = mlngWindowsNT systemType.Text = "Windows NT" Else glngWhichWindows32 = mlngWindows95 systemType.Text = "Windows 95" End If End Sub

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