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restart ? shutdown ?

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6 replies

by virendra argekar

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hi there
can you tell me , in vb 6.0 ... how can add an option to restart Windows and to shutdown windows 98 or ME !

i tried all books, but no mention . i need this for my schoool project . our teacher does not want to tell. who knowif the teacher also knows ! well anyways m plz help me .!!

thanks in advance

6 replies

by ntoz

Attribute VB_Name = "Module1"
Option Explicit
Const EWX_LogOff As Long = 0
Const EWX_SHUTDOWN As Long = 1
Const EWX_REBOOT As Long = 2
Const EWX_FORCE As Long = 4
Const EWX_POWEROFF As Long = 8 'The ExitWindowsEx function either logs off, shuts down, or shuts
'down and restarts the system.
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.
Declare Function GetLastError Lib "kernel32" () As Long

Const mlngWindows95 = 0
Const mlngWindowsNT = 1

Public glngWhichWindows32 As Long

'The GetVersion function returns the operating system in use.
Declare Function GetVersion Lib "kernel32" () As Long

Type LUID
UsedPart As Long
IgnoredForNowHigh32BitPart As Long
End Type

Type LUID_AND_ATTRIBUTES
TheLuid As LUID
Attributes As Long
End Type

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

'The GetCurrentProcess function returns a pseudohandle for the
'current process.
Declare Function GetCurrentProcess Lib "kernel32" () As Long

'The OpenProcessToken function opens the access token associated with
'a process.
Declare Function OpenProcessToken Lib "advapi32" _
(ByVal ProcessHandle As Long, _ByVal DesiredAccess As Long, _
TokenHandle As Long) As Long

by ntoz

'The LookupPrivilegeValue function retrieves the locally unique
'identifier (LUID) used on a specified system to locally represent
'the specified privilege name.
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.
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

Declare Sub SetLastError Lib "kernel32" _(ByVal dwErrCode As Long)

Sub AdjustToken()

'********************************************************************
'* This procedure sets the proper privileges to allow a log off or a
'* shut down to occur under Windows NT.
'********************************************************************

by ntoz

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
MsgBox "GetCurrentProcess error==" & GetLastError
End If

OpenProcessToken hdlProcessHandle, _
(TOKEN_ADJUST_PRIVILEGES Or TOKEN_QUERY), hdlTokenHandle

by ntoz

If GetLastError <> 0 Then
MsgBox "OpenProcessToken error==" & GetLastError
End If

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

If GetLastError <> 0 Then
MsgBox "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
MsgBox "AdjustTokenPrivileges error==" & GetLastError
End If

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