Re: MFC doc/view singleton?

"Jonathan Wood" <>
Fri, 6 Feb 2009 15:19:31 -0700
"Trevor" <> wrote in message

I want to display many different types of documents at the same time in the
same frame window. As far as I know, that is what a MDI window was
designed for.

Well, I think it was more designed for multiple windows of the same type.

I am taking advantage of the CMDIFrameWndEx support for tabbed MDI child
windows and other functionality. It doesn't make sense for me to rewrite
all of that in a SDI program when it already exists in an MDI program.

I agree. You didn't say before that you had a bunch of view types.

What you want shouldn't be difficult. You just need to intercept when a new
view is being created and check the type. Unfortunately, I don't know off
the top of my head the best way to do this. Perhaps someone else has done
something like this recently.

"Jonathan Wood" <> wrote in message

Just create an SDI application.

Then, if you want to prevent someone opening multiple copies of the
program and creating another document that way (something I'd probably
not choose), then detect this on start up and, if there's an existing
instance of your app, activate the existing one and terminate.

Jonathan Wood
SoftCircuits Programming

"Trevor" <> wrote in message

What is the best way to implement a MFC MDI Doc/View application where
each view can only be created once? If a user tries to open a new
"home" document (defined via AddDocTemplate) and there is already a
CHomeView displayed, I want to set the focus to the displayed CHomeView
and not create a second CHomeView. What do I need to override to get
this behavior?

Jonathan Wood
SoftCircuits Programming

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