Re: Nullable CDateTimeCtrl?

From:
"Doug Harrison [MVP]" <dsh@mvps.org>
Newsgroups:
microsoft.public.vc.mfc
Date:
Mon, 24 Mar 2008 10:50:05 -0500
Message-ID:
<9sifu3d2fb96kbgu0q69i8v0ji5trqlfu5@4ax.com>
On Mon, 24 Mar 2008 07:58:55 -0700 (PDT), rockdale
<rockdale.green@gmail.com> wrote:

Hi, all:

I have a datetime fiels visit_date on my dialog which currently using
CDateTimeCtrl for use to pick the date that they visit, but the visit
date should allow null which the CdateTimeCtrl does not support, what
is the best way to implement this?

I am thinking using a masked CEdit ctrl for user to enter date /delete
date, then put a button besidethe textbox so user can click this
button to shoiw the calendar if they want choose date from the
CDateTimeCtrl?

Or are any better implementations out there already, please point me
to the hyperlinks.


You can hide the current value with SetFormat(" "). To restore the default
format, SetFormat(0). This works great for showing a blank control, when
the control is disabled, but if you want to show a blank, enabled control,
you'll have to figure out which messages to handle in order to restore the
date/time display at the right moment.

--
Doug Harrison
Visual C++ MVP

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