Re: Strange CVSListBox behavior

From:

"David Ching" <dc@remove-this.dcsoft.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Sun, 18 Apr 2010 07:42:52 -0700

Message-ID:

<uejIuVw3KHA.4416@TK2MSFTNGP06.phx.gbl>

"Ruslan Shcherbatyuk" <Ruslan Shcherbatyuk@discussions.microsoft.com> wrote
in message news:C7CDF49F-B79E-4205-A166-D344905AD1F9@microsoft.com...

Deep debugging shows me that the problem is in CVSListBoxBase::OnPaint
method, CString release. Problem appears when CVSListBox has no caption
and
uses default one (""). I can fix this problem by using SetWindowText("")
to
CVSListBox control inside of OnInitDialog of the CPropertyPage, but this
is a
workaround. I aslo used Spy++ on HWND window of
CVSListBoxBase::GetWindowText
and saw that GetWindowTextLength is 10 but actual GetWindowText returns
"\0"
if it is important.

Is it a logic error in CVSListBox that it mishandles the CString when there
is none, or something else? How does CVSListBox or its ancestors like
CVSListBoxBase handle WM_GETTEXT (which is called when GetWindowText is
called)?

Can somebody comment or describe me what is exactly wrong? Unfortunately
the
project is very big and I can't post it here.

Try to repro it by creating a simple dialog app and putting a CVSListBox
inside it.

-- David