PRB: Assertion While Switching Property Pages in OLE Control

 Last reviewed: October 10, 1997
Article ID: Q140105
2.00 2.10 2.20 4.00 WINDOWS NT kbprg kbui kbole kbprb

The information in this article applies to:

  • The Microsoft Foundation Classes (MFC) included with: Microsoft Visual C++, 32-bit Edition, versions 2.0, 2.1, 2.2, 4.0

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: 

   ARTICLE-ID: Q127074
   TITLE     : How to Use AFX_MANAGE_STATE in an OLE Control

Additional refernce words: kbinf 2.00 2.10 2.20 4.00

KBCategory: kbprg kbui kbole kbprb
KBSubCategory: MfcOLE
Keywords : kbole kbprb kbprg kbui
Technology : kbMfc
Version : 2.00 2.10 2.20 4.00
Platform : NT WINDOWS

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Last reviewed: October 10, 1997
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