WM_QUERYENDSESSION and wxMSW

[Volker Bartheld]

Hi folks!

I have an ensemble of wxW and non-wxW applications exchanging data via
sockets. An user has reported a problem when shutting down the PC (in fact,
he just pressed the "Soft Off" button) which had the "Ending program please
wait..." popup come up, followed by a Microsoft error reporting sheet.

I don't know how wxW apps are handling WM_QUERYENDSESSION followed by
WM_ENDSESSION (wich WinXP supposedly emits when shutting down) and if it
just results in wxWindow::OnClose() being called on the main window or even
wxWindow::Destroy() being issued on all windows of the app.

Are there any events I should log to get more info?

Findings:

I created a little Win32-native executable, sendmsg, that is capable of
sending all kinds of messages to running applications. In my case, I used
  sendmsg -c "Caption of my App" -m WM_QUERYENDSESSION
which made the misbehaving app close without any problems. So I guess the
problem arises when *all* related/communicating applications get the
message at the same moment and shut down more or less synchroneously. Or
probably WinXP does more than just broadcasting WM_QUERYENDSESSION and
WM_ENDSESSION somewhat later.

Any experts out there that could give me a hint?

Thanks in advance!
Volker

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