2. Questions about PowerDown and Hibernation - need help

[tibiz]

I need to catch Windows PowerDown from a process and block it. This is nicely implemented in MS Outlook 2002 or later (try to power down your computer when MS Outlook is running) 1. How can I catch a Windows PowerDown (or Hibernation) Event without using window (HWND) message queue 2. A way to block or deactivate the PowerDown Any help will realy help, thank you

[Stephen Hewitt]

What's the problem with using a window? It need not be visible.

Steve

[tibiz]

we can't use visible HWND window in our app, and invisible window don't behave well

[Stephen Hewitt]

Invisible window work just fine. Windows use the technique itself, for example COM uses invisible windows in some circumstances. Later versions of Windows also have message-only windows.

Steve

[tibiz]

I tried the way using creating classic HWND window receiving WM_POWERBROADCAST and returning BROADCAST_QUERY_DENY. Problem is - if I create the window and let it invisible, it don't receive any WM_POWEBROADCAST message.