Re: Strange CComboBox::PresubclassWindow problem

From:

"AliR $VC++ MVP$" <AliR@online.nospam>

Newsgroups:

microsoft.public.vc.mfc

Date:

Wed, 9 May 2007 10:00:47 -0500

Message-ID:

<ypl0i.1668$UU.173@newssvr19.news.prodigy.net>

Try moving the call to after CComboBox::PreSubclassWindow()

AliR.

"Eric Margheim" <NOSPAM***eric@prism-grp.com***NOSPAM> wrote in message
news:exALIikkHHA.4628@TK2MSFTNGP06.phx.gbl...

I have a class derived from CComboBox. I override DrawItem to manipulate
the drawing of the list elements. For this to work I turn on
LBS_OWNERDRAWFIXED in the Create method style. For instances when the
control is actually in the dialog resource I explicitly set the parameters
in the properties. Simple enough.

I use SetItemHeight to configure the control. I have this in the Create
method for the cases when I dynamically create the control in a dialog.
I also have SetItemHeight code in PresubclassWindow for the cases when the
combobox control is part of a dialog resource.

My problem is that the SetItemHeight in PresublcassWindow is blowing on an
ASSERT (IsWindow(m_hWnd)) when the control is created dynamically.
m_hWnd is apparently bogus at this point. It shows "unused".

I can easily enough put some sort of bool member variable in Create that
tells me not to do SetItemHeight in PresubclassWindow, but that seems like
it might be a workaround for an underlying problem.

Can someone explain to me what's going on here?

Thanks

Eric