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Q140105: PRB: Assertion While Switching Property Pages in OLE Control

Article: Q140105
Product(s): Microsoft C Compiler
Version(s): winnt:2.0,2.1,2.2,4.0
Operating System(s): 
Keyword(s): kbActiveX kbCOMt kbCtrlCreate kbMFC kbPropSheet kbVC200 kbVC210 kbVC220 kbVC400 kbGrpDS
Last Modified: 06-MAY-2001

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The information in this article applies to:

- The Microsoft Foundation Classes (MFC), used with:
   - Microsoft Visual C++, 32-bit Editions, versions 2.0, 2.1, 2.2, 4.0 
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SYMPTOMS
========

If you have implemented an OLE control that uses a basic MFC CPropertySheet as a
user interface, you may receive the following error when trying to switch pages
by clicking the tab:

  Assertion Failed
  OC30D.DLL: File DlgCore.CPP Line 194

CAUSE
=====

This assertion occurs in _AfxCheckDialogTemplate, when MFC cannot find the
dialog template resource for the property page.

RESOLUTION
==========

The solution is to override CPropertyPage::OnSetActive and use AFX_MANAGE_STATE
as in the following code:

Sample Code
-----------

     /* Compile options needed - none
        Add the following code to each of your CPropertyPage-derived classes.
     */ 
     BOOL CYourPropPage::OnSetActive()
     {
       AFX_MANAGE_STATE(_afxModuleAddrThis);
       return CPropertyPage::OnSetActive();
     }

The prototype for OnSetActive must also be added to your CPropertyPage- derived
class header file.

REFERENCES
==========

For information on AFX_MANAGE_STATE, please see the following article in the
Microsoft Knowledge Base:

  Q127074 How to Use AFX_MANAGE_STATE in an OLE Control

Additional query words: kbvc200 kbvc210 kbvc220 kbvc400 kbmfc

======================================================================
Keywords          : kbActiveX kbCOMt kbCtrlCreate kbMFC kbPropSheet kbVC200 kbVC210 kbVC220 kbVC400 kbGrpDSMFCATL kbNoUpdate 
Technology        : kbAudDeveloper kbMFC
Version           : winnt:2.0,2.1,2.2,4.0
Issue type        : kbprb

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