Re: Homework question relating to docview

"David Ching" <>
Fri, 13 Jul 2007 13:44:37 GMT
"Doug Harrison [MVP]" <> wrote in message

"Message handler" and "virtual" aren't mutually exclusive. That said,
functions aren't message handlers but are instead called from various
message handlers as part of the open/save procedures. A major problem with
normal (non-virtual) message handlers is getting polymorphic behavior out
of them; you have to use SendMessage or PostMessage, which is clumsy and
error-prone. Functions that are intended to be overridden and called from
many places are best expressed as virtual functions, which of course can
called from message handlers.

Well, I never thought of this as a problem because e.g. if I handle
WM_ERASEBACKGND, in that handler, I've always been able to call
CBaseClass::OnEraseBkgnd() and did not have to resort to SendMessage(). I
don't exactly know what magic makes that work.

 If you want to find the actual message
handlers, search for ID_FILE_SAVE and ID_FILE_OPEN. You'll find the UI is
done outside of the CDocument functions you quoted, which are essentially
the customizable, non-UI guts of the open/save procedures.

Found them, thanks. :-) So I guess the AppWizard wires those commands
(e.g. from menubar and toolbar) to the CDocument handlers when the project
is created. Neat.

-- David

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