Logoff and Shutdown

Can these be done with an API calls and if so, which ones?

Maybe this is what you want???

VB Code:

Declare Function ExitWindowsEx Lib "user32.dll" (ByVal uFlags As 
Integer, ByVal dwReserved As Long) As Integer 
'Shutdown values 
Public Const EWX_LOGOFF = 0 
Public Const EWX_SHUTDOWN = 1 
Public Const EWX_REBOOT = 2 
Public Const EWX_FORCE = 4 
Public Const EWX_POWEROFF = 8

OK = ExitWindowsEx(EWX_LOGOFF, 0&)

VB Code:

Option 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
Private 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()
    Unload Me
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