How to detect Windows is Closing Down / System Shutdown?

CarlBarnes · September 30, 2022, 6:07pm

The included FrameExtension Template Jane mentions is probably the easiest.

If you want more control … Windows sends 2 messages (events). You have to subclass the frame to get them. For more info search the web for WM_QUERYENDSESSION and WM_ENDSESSION. If you answer YES your Frame will get an EVENT:CloseDown and it will send that to all Children.

WM_QUERYENDSESSION EQUATE(0011h) !Windows is asking if we would shutdown, True says YES
WM_ENDSESSION EQUATE(0016h) !Windows IS shutting down, we say YES and will get EVENT:CloseDown next

This template has the code. You can add it to an APP and generate to see the code it adds.

gist.github.com

https://gist.github.com/CarlTBarnes/5e0e7d5a3e3f0b5c991e8f0601e69004

CBAltWin7Fix.tpl

#TEMPLATE (CBAltFix, 'Carl Barnes fix for Alt Key Lockup in Windows 7'),FAMILY('ABC','CW20')
#!===========================================================================
#! Warning! Version 2 of the template changes things.
#! The Global template AltWin7Fix_Global has been removed and is no longer needed.
#! The Frame template AltWin7Fix_Frame has been renamed because it has new questions
#! Only the Frame Extension template is required, it is where you specify all choices.
#! It has a new name AltWin7Fix_Frame2 so you must populate it again on the Frame.
#! If you used the first version of the template you will get errors when you open
#! an APP. Ignore the errors, you should open the Frame, go to Extenstions and add the new template.
#! *** Removed ===>#EXTENSION (AltWin7Fix_Global,'Fix Windows 7 Alt Key Lockup-Global-by Carl Barnes'), APPLICATION

This file has been truncated. show original