Question

I am writing an native c++ application that needs to do a quick bit of work if the Windows 7 system is put into sleep mode—otherwise it will unavoidably crash when the system wakes up.

What is the easiest way to register for a system event (suspend) using native c++?

I really just want to do what these guys do but I have an arbitrary class (not a gui) that I would like to have setup an event handler and get the PBT_APMSUSPEND event and I’m not sure the easiest way to do this.

Autoitscript apparently has a nice way where you can write

GUICreate("Event Receiver")
GUIRegisterMsg($WM_POWERBROADCAST,"MY_WM_CALLBACKFUNCTION")

and I was hoping to have something similarly easy…. without a full-on message pump setup.

Answer 1

Simply create a hidden window using CreateWindow/Ex() and have its window procedure callback process WM_POWERBROADCAST messages. You don’t need to create a GUI app in order to create windows.