WM_POWERBROADCAST handler for CMainDlg in ATL app not invoked

Question

I have an ATL app where I want to handle WM_POWERBROADCAST. I have a CMainDlg (CAxDialogImpl) in whose MSG_MAP I defined the handler.

BEGIN_MSG_MAP(CMainDlg)
    ...
    MESSAGE_HANDLER(WM_POWERBROADCAST, OnPowerChange)
    ...
END_MSG_MAP()

However, the handler isn't invoked when I do things that should invoke it, for instance change power settings or put the machine to sleep.

Any ideas about what might be going on, and how to fix this? Does CMainDlg not get notified of power events, for some reason?

Answer 1

Did you register to receive the power events?

Answer 2

I suspect your dialog not being a top level window (WS_POPUP styled).

Just tested with a WTL AppWizard non modal dialog app that WM_POWERBROADCAST is received (without any registration) on AC plugged/unplugged.

cheers, AR