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Detecting Windows Shutdown

I'm writting a windows app, that has no UI, no windows, is not a service, and is not a console application.
How can I detect a windows shutdown so my application can perform a clean exit?
Example code is useful too.
Thanks in advance.

AndyAinscow

These are the only ways I know of.

WM_QUERYENDSESSION

The WM_QUERYENDSESSION message is sent when the user chooses to end the session or when an application calls the ExitWindows function. If any application returns zero, the session is not ended. The system stops sending WM_QUERYENDSESSION messages as soon as one application returns zero.

and

WM_ENDSESSION

The WM_ENDSESSION message is sent to an application after the system processes the results of the WM_QUERYENDSESSION message. The WM_ENDSESSION message informs the application whether the session is ending.

js-profi

WM_QUERYENDSESSION is only sent to apps which have a windows message loop. You need at least one (pseudo) window for that.

js-profi

Why not make it a service? Then, SCM will call you by callback in case of a shutdown.

SexyFast

ASKER

Any example code for having a message loop?

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js-profi

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js-profi

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the thread which runs that loop will be blocked after that
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ignore that. PeekMessage only peeks as long as there are messages. you need a handling after loop so that the message loop was called again until you want to stop.