Thread: Detecting lid close?

  1. #1
    Registered User
    Join Date
    Mar 2009

    Cool Detecting lid close?

    Learning noob here. Anyway, is it possible in C++ to detect the closing of my laptop's lid?
    Thanks in advance!

  2. #2
    Banned ಠ_ಠ's Avatar
    Join Date
    Mar 2009
    C++ is Turing complete

  3. #3
    Registered User
    Join Date
    Mar 2009
    Huh? Could you explain?

  4. #4
    Registered User
    Join Date
    Mar 2009
    Could this topic be moved to "Windows Programming" by an admin?

  5. #5
    Kernel hacker
    Join Date
    Jul 2007
    Farncombe, Surrey, England
    Lid closing on a laptop is handled by the ACPI system. I'm not sure if there is any ACPI interface that allows user-mode code to get ACPI messages. I suspect not, as it's generally not something that user-mode applications do need to care about, so there is no reason to implement some way to forward that to the user-mode.

    Also, whist it is part of ACPI, it is implementation dependant.

    If there is no ACPI driver in the system, the BIOS will handle ACPI. Again, it's not possible for user-mode applications to get info out of BIOS.

    There's more info on ACPI here:

    I don't know if there is a similar document for XP and older versions of NT-class OS's.

    Compilers can produce warnings - make the compiler programmers happy: Use them!
    Please don't PM me for help - and no, I don't do help over instant messengers.

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