[python-win32] HookMessage fails

[TK Soh]

On 5/15/07, Mark Hammond <mhammond at skippinet.com.au> wrote:
> > > This is the magic of MFC - if no parent is specified, the
> > "main window" for
> > > the application is automatically used.
> > >
> >
> > Isn't that the issue, then?  He's writing a dialog to plug in to
> > Explorer, and every time he runs, there's a different "main window".
> > MFC gets its concept of a "main window" from its global
> > state, so unless
> > something in the process tells MFC to refresh its global
> > state, it will
> > have stale information.
>
> Quite possibly - I'm afraid I can't recall the exact semantics for dialog
> based apps, but I suspect that a number of things in MFC will end up getting
> upset if the nominated main window dies but the application does not - but
> win32ui.GetApp().SetMainFrame() can be used to change this value
> dynamically.  I'm afraid I haven't found the time to read the other messages
> in enough detail to offer more concrete suggestions (other than to possibly
> consider using win32gui to avoid future MFCisms from biting)

Hi Mark,

Not sure it's helps to clarify my situation, but the dialog in
question is actually a simple subclass of pywin.mfc.dialog, with a
resize handler hooked to WM_SIZE with HookMessage().

This dialog forms part of the shell extension registered to Explorer,
which does work similar to TortoiseSVN or TortoiseCVS. The dialog is
then called from the context menu in the Explorer windows by a simple
call of something like this:

   dlg = MyResizableDialog()
   dlg.CreateWindow()

Everything in the dialog works fine, except the ability to resize is
somehow lost when the dialog is opened from subsequent Explorer
windows.

In any case, if you think it helps, I can email you the code. It'd be
great if you can suggest anything I can try to debug this.Thanks.