Re: CPropertyPage OnSetActive, UpdateData, and m_bFirstSetActive

From:
"AliR \(VC++ MVP\)" <AliR@online.nospam>
Newsgroups:
microsoft.public.vc.mfc
Date:
Fri, 13 Apr 2007 20:11:41 GMT
Message-ID:
<1uRTh.9688$YL5.715@newssvr29.news.prodigy.net>
Joe,

I think you missed the point. He is asking why is there a safety button on
a gun, when he can simply bypass the safety by pressing the little red
button and shoot himself in the foot.

AliR.

"Joseph M. Newcomer" <newcomer@flounder.com> wrote in message
news:qdnv1392130jggu1ed7j0r5i8m18i9249v@4ax.com...

Well, since I would never think of using UpdateData for any purpose, so
I'd suggest the
first thing you do is delete all instances of UpdateData in your code.
See my essay on
this. UpdateData is poorly designed for the purpose of manipulating
controls.
joe

On Fri, 13 Apr 2007 11:16:02 -0700, Juancho Panza <Juancho
Panza@discussions.microsoft.com> wrote:

Using VS2005 and MFC -- the help for OnSetActive() says "Your override of
this member function would typically call the default version after
updating
data members, to allow it to update the page controls with the new data."

Curiously however, CPropertyPage::OnSetActive() has a BOOL
m_bFirstSetActive
which prevents the UpdateData(false) from being invoked the first time.

So it's a protected BOOL and my subclass could blast it back to false
after
the CommonConstruct() has set it to TRUE, or I could call the baseclass
OnSetActive() twice, or manually call UpdateData(false), but ...

Why o why does the BOOL exist in the first place ? Obviously I'm just
curious since I can code around it a number of different ways ...

Jon

Joseph M. Newcomer [MVP]
email: newcomer@flounder.com
Web: http://www.flounder.com
MVP Tips: http://www.flounder.com/mvp_tips.htm

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