Re: ListBox in a FormView

From:

"Scott McPhillips [MVP]" <org-dot-mvps-at-scottmcp>

Newsgroups:

microsoft.public.vc.mfc

Date:

Fri, 28 Apr 2006 12:01:33 -0400

Message-ID:

<#XxGa0taGHA.4916@TK2MSFTNGP04.phx.gbl>

Gerry Murphy wrote:

Initialize the list box after calling CFormView::OnInitialUpdate.

If I do that in Debug mode I get an assert in WINCORE.CPP
at the second line below:

BOOL CWnd::Attach(HWND hWndNew)
{
ASSERT(m_hWnd == NULL); // only attach once, detach on destroy
ASSERT(FromHandlePermanent(hWndNew) == NULL);
// must not already be in permanent map

if (hWndNew == NULL)
return FALSE;
_afxMapHWND.SetPermanent(m_hWnd = hWndNew, this);
return TRUE;
}

In release mode it crashes.

My hunch is that I may have to move the function calls that load the
listboxes out of OnInitialUpdate(), but then I'm not sure where to
call them.

Thanks,

Gerry Murphy

This function would not be called from m_listbox.AddString(), so its not
clear what's going on. It would be useful to have a look at the stack
at this point and find out why Attach is being called. The assert
failure implies an attempt to connect the control variable to the
control twice. Review any calls to DDX_CONTROL and/or SubclassDlgItem.

--
Scott McPhillips [VC++ MVP]