DOCUMENT:Q161136 25-MAR-1997 [vbwin] TITLE :HOWTO: Shutdown Windows NT and Windows 95 from Visual Basic Code PRODUCT :Microsoft Visual Basic for Windows PROD/VER:5.0 OPER/SYS:WINDOWS KEYWORDS:kbusage vb5all vb5howto VBKBSDK kbhowto ====================================================================== The information in this article applies to: - Learning, Professional, and Enterprise Editions of Microsoft Visual Basic for Windows, version 5.0 --------------------------------------------------------------------- SUMMARY ======= Periodically, you may need to shutdown Windows NT and Windows 95 from Visual Basic code. The Step-by-Step Example in this article shows how to do this by using the Windows API. MORE INFORMATION ================ Step-by-Step Example -------------------- 1. Start a new Standard EXE project. Form1 is added by default. 2. Add a CommandButton (named cmdForceShutdown) to Form1. 3. Add the following code to the General Declarations section of Form1: 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 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 End Sub Private Sub cmdForceShutdown_Click() AdjustToken ExitWindowsEx (EWX_SHUTDOWN Or EWX_FORCE Or EWX_REBOOT), &HFFFF End Sub 4. On the File menu, click Save Project. Select a folder and a name for your project. Click OK. REFERENCES ========== Microsoft Win32 SDK ====================================================================== Keywords : kbusage vb5all vb5howto VBKBSDK kbhowto Version : 5.0 Platform : WINDOWS Issue type : kbhowto ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 1997.