KnowledgeBase Archive

An Archive of Early Microsoft KnowledgeBase Articles

View on GitHub

Q173027: FIX: CRichEditView as Second Splitter Pane Causes Crash

Article: Q173027
Product(s): Microsoft C Compiler
Version(s): winnt:4.0,4.0a,4.1
Operating System(s): 
Keyword(s): kbDocView kbMFC kbVC400bug kbVC410bug kbVC420fix kbGrpDSMFCATL
Last Modified: 17-JUL-2001

-------------------------------------------------------------------------------
The information in this article applies to:

- The Microsoft Foundation Classes (MFC), used with:
   - Microsoft Visual C++, 32-bit Editions, versions 4.0, 4.0a, 4.1 
-------------------------------------------------------------------------------

SYMPTOMS
========

If an MFC program uses a CRichEditDoc and a CRichEditView is not the first pane
of a splitter window, an access violation occurs when you start the program.

CAUSE
=====

MFC's CRichEditDoc::GetView always assumes the first view of the active frame
window is a CRichEditView. The pointer is returned and used as a CRichEditView
object even though it may not be. The crash occurs when you use a data member or
function specific to CRichEditView.

RESOLUTION
==========

Since GetView is not virtual, it cannot be overriden. When using Visual C++ 4.0
or 4.1, make sure that the first pane is a CRichEditView.

STATUS
======

Microsoft has confirmed this to be a bug in the Microsoft products listed at the
beginning of this article. This bug has been corrected in the Microsoft
Foundation Classes version 4.2 and shipped with Visual C++ version 4.2.

MORE INFORMATION
================

When a CRichEditView is specified during the creation of an MFC program using
AppWizard, a CRichEditDoc derived class is created for the program. When the
rich edit view is initially displayed, the framework calls
CRichEditDoc::SetTitle to update the frame window's title. However, SetTitle
calls GetView, which returns the first view in the view list.

(c) Microsoft Corporation 1997, All Rights Reserved. Contributions by Adam Kim,
Microsoft Corporation


Additional query words:

======================================================================
Keywords          : kbDocView kbMFC kbVC400bug kbVC410bug kbVC420fix kbGrpDSMFCATL 
Technology        : kbAudDeveloper kbMFC
Version           : winnt:4.0,4.0a,4.1
Issue type        : kbbug
Solution Type     : kbfix

=============================================================================

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.