Technical Support Notes

You can use the Windows API to shutdown Windows NT from VB. Because of the security used in Windows NT, it takes several lines of code to preform this task.

The following code example comes from Microsoft Article Q161136. See the article for the latest information. You can find this article by searching the Microsoft Knowledge base for article Q161136 on the web at http://msdn.microsoft.com.

Option Explicit

Private Type LUID
    UsedPart As Long
    IgnoredForNowHigh32BitPart As Long
End Type

Private Type TOKEN_PRIVILEGES
    PrivilegeCount As Long
    TheLuid As LUID
    Attributes As Long
End Type

' Beginning of Code
Private Const EWX_SHUTDOWN As Long=1
Private Const EWX_FORCE As Long=4
Private Const EWX_REBOOT=2

Private Declare Function ExitWindowsEx Lib "user32" ( _
    ByVal dwOptions As Long, ByVal dwReserved As Long) As Long

Private Declare Function GetCurrentProcess Lib "kernel32" () As Long

Private Declare Function OpenProcessToken Lib "advapi32" ( _
    ByVal ProcessHandle As Long, ByVal DesiredAccess As Long, _
    TokenHandle As Long) As Long

Private Declare Function LookupPrivilegeValue Lib "advapi32" _
    Alias "LookupPrivilegeValueA" (ByVal lpSystemName As String, _
    ByVal lpName As String, lpLuid As LUID) As Long

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 Sub AdjustToken()

    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
    hdlProcessHandle=GetCurrentProcess()

    OpenProcessToken hdlProcessHandle, (TOKEN_ADJUST_PRIVILEGES Or _
        TOKEN_QUERY), hdlTokenHandle

    ' Get the LUID for shutdown privilege.
    LookupPrivilegeValue "", "SeShutdownPrivilege", tmpLuid

    ' One privilege to set tkp.
    PrivilegeCount=1
    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
End Sub

Private Sub cmdForceShutdown_Click()

    AdjustToken
    ExitWindowsEx (EWX_SHUTDOWN Or EWX_FORCE Or EWX_REBOOT), &HFFFF;
End Sub

Note:
You can shutdown SPEL for Windows 2.0, Windows, or reboot from SPEL by using the Shutdown instruction in a SPEL program. The most common use for this is for a program that uses the SPEL for Windows Operator Window interface to display a menu that allows the operator to restart the system.

For details on Shutdown, search for it in SPEL for Windows 2.0 Help.

The Power of Choice!