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  1. #1
    Join Date
    Mar 2006

    Question Detect what sent WM_QUERYENDSESSION?

    I know after reading about WM_QUERYENDSESSION that windows typically sends this message to all running applications when a user is either logging off, restarting, or shutting a PC down. I have an application with a handler for when this event is received, so I can see that the WM_QUERYENDSESSION message is coming in, but I don't know what is causing it. The user claims that the application "stops working" suddenly and freezes up, and I assume that they weren't logging off or restarting or shutting down the PC. Is there any other instance in which the WM_QUERYENDSESSION could be sent out to applications or is there a something I can look for in determining what caused it?
    "My software doesn't have bugs, it just develops random features."

  2. #2
    2kaud's Avatar
    2kaud is offline Super Moderator Power Poster
    Join Date
    Dec 2012

    Re: Detect what sent WM_QUERYENDSESSION?

    WM_QUERYENDSESSION is also sent when the ExitWindows() function is called.

    lParam contains some simple info re the reason for WM_QUERYENDSESSION called.
    All advice is offered in good faith only. All my code is tested (unless stated explicitly otherwise) with the latest version of Microsoft Visual Studio (using the supported features of the latest standard) and is offered as examples only - not as production quality. I cannot offer advice regarding any other c/c++ compiler/IDE or incompatibilities with VS. You are ultimately responsible for the effects of your programs and the integrity of the machines they run on. Anything I post, code snippets, advice, etc is licensed as Public Domain https://creativecommons.org/publicdomain/zero/1.0/ and can be used without reference or acknowledgement. Also note that I only provide advice and guidance via the forums - and not via private messages!

    C++17 Compiler: Microsoft VS2017 (15.7.4)

  3. #3
    VictorN's Avatar
    VictorN is offline Super Moderator Power Poster
    Join Date
    Jan 2003
    Hanover Germany

    Re: Detect what sent WM_QUERYENDSESSION?

    Quote Originally Posted by Ciralia View Post
    ... is there a something I can look for in determining what caused it?
    Well, 2kaud has already answered you.
    But I wonder why do you ignore MSDN?
    Just read about WM_QUERYENDSESSION message and all the related topics from the section See also!
    Victor Nijegorodov

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