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POExitWindowsEx fails even after adjusting my privilege token
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  1. POExitWindowsEx fails even after adjusting my privilege token
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    copied!<p>I'm trying to shutdown Windows programmatically:</p> <pre><code>Function ExitWindows() As Integer Declare Function GetCurrentProcess Lib "Kernel32" () As Integer Declare Function OpenProcessToken Lib "AdvApi32" (handle As Integer, access As Integer, ByRef tHandle As Integer) As Boolean Declare Function LookupPrivilegeValueW Lib "AdvApi32" (sysName As Ptr, privName As WString, Luid As Ptr) As Boolean Declare Function AdjustTokenPrivileges Lib "AdvApi32" (tHandle As Integer, disableAllPrivs As Boolean, newState As Ptr, buffLength As Integer, prevPrivs As Ptr, ByRef retLen As Integer) As Boolean Declare Function ExitWindowsEx Lib "User32" (flags As Integer, reason As Integer) As Boolean Declare Function GetLastError Lib "Kernel32" () As Integer Const SE_PRIVILEGE_ENABLED = &amp;h00000002 Const TOKEN_QUERY = &amp;h00000008 Const TOKEN_ADJUST_PRIVILEGES = &amp;h00000020 Const SE_SHUTDOWN_NAME = "SeShutdownPrivilege" Const EWX_SHUTDOWN = &amp;h00000001 Dim pHandle As Integer = GetCurrentProcess() //a handle to the current process Dim tHandle As Integer //a handle to the token If OpenProcessToken(pHandle, TOKEN_ADJUST_PRIVILEGES Or TOKEN_QUERY, tHandle) Then Dim mb As New MemoryBlock(8) mb.UInt32Value(0) = 1 mb.Int32Value(4) = SE_PRIVILEGE_ENABLED Dim pt As Ptr If LookupPrivilegeValueW(Nil, "SeShutdownPrivilege", mb) Then Dim z As Integer If AdjustTokenPrivileges(tHandle, False, mb, mb.Size, pt, z) Then If Not ExitWindowsEx(EWX_SHUTDOWN, 0) Then Return GetLastError() //Returns 1314 End If Else Return GetLastError() End If Else Return GetLastError() End If Else Return GetLastError() End If End Function </code></pre> <p>Each function call succeeds except for ExitWindowsEx, which invariably will fail with error code 1314 (Privilege not held) even when running as Admin. Reboot has the same problem but Logoff works.</p> <p>What am I doing wrong here?</p>
 

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