How to abort shutdown in Windows Vista and 7 programatically?

In the second example (in the section examples) on this link, there is a description on using WM_QUERYENDSESSION to abort a shutdown. It also states that this does not work on versions of windows later than X开发者_如何学PythonP. This is conflicting with the advice given on another question here at stackoverflow. What is the correct answer? I do not have a computer with either so I am unable to test.

Some applications got the WM_QUERYENDSESSION handling wrong (Not passing to DefWindowProc, they incorrectly returned 0 even though they did not intend to block shutdown) and so MS changed it with Vista, you now need to call ShutdownBlockReasonCreate()

@Konamiman: shutdown.exe -a will abort a "scheduled" shutdown yes, but not a "normal" shutdown by someone calling ExitWindowsEx()

If anything else fails, remember that from command line it is shutdown.exe -a; maybe you could invoke this using the Process class.

EDIT. When mentioning the Process class I happily assumed that the question was about .NET programming, now I see that .NET is not mentioned neither in the question nor in the tags. Anyway I believe that there are ways to run executables from other programming environments as well.