KB956003: BUG: MFC Feature Pack wizard generated code with CFormView-derived view shows Debug Assertion

Question

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Link to Original Article from Microsoft Support

BUG: MFC Feature Pack wizard generated code with CFormView-derived view shows Debug Assertion

Action

Note: This article applies to the Visual C++ 2008 Feature Pack

1.	Create a MFC Document/View application.
2.	Under Application Type, select the Project style as “Office”.
3.	Select Use of MFC as “static library”, Click Next.
4.	Under Generated Classes, select the CFormView as base class for application view.
5.	Click Finish.
6.	A message will appear saying “No printing support will be available for CFormView”. Click Yes.
7.	Build and Run your application.

Result

The application shows a debug assertion on f:\dd\vctools\vc7libs\ship\atlmfc\src\mfc\afxribbonbar.cpp, Line: 3891



The following function shows the assertion:

CMFCRibbonCategory* CMFCRibbonBar::AddPrintPreviewCategory()
{
        ...
    // This line shows the assertion
    ENSURE(str1.LoadString(AFX_IDS_ONEPAGE));

        ...
}

Answer 1

Cause

During the initialization of ribbon bar control, the application calls SetQuickAccessDefaultState() to set the Quick Access Toolbar. Inside this function, the ribbon bar tries to recalculate its layout by calling RecalcLayout() function. This function internally checks if printing is supported by the class, then it adds it to the Print Preview Category. While adding it to this category, the application tries to load a printing string resource with ID AFX_IDS_ONEPAGE. Since this resource ID is not part of the application instance, loading it shows an debug assertion.

Resolution

Disable the Print Preview for Ribbon Bar. This can be done using CMFCRibbonBar::EnablePrintPreview function.

More Information

This is a know bug with the wizard-generated code. CFormView classes do not have printing support. After creating the project, the wizard does prompt the message “No printing support will be available for CFormView”, but it fails to generate correct code for ribbon bar for disabling the printing.

Making the following change allows it to work.

void CMainFrame::InitializeRibbon()

{

            ...

            // Disable the Print Preview for Ribbon Bar

            m_wndRibbonBar.EnablePrintPreview(FALSE);

            m_wndRibbonBar.SetQuickAccessCommands(lstQATCmds);

            ...

}

As the application links statically to MFC, the ID will not be available in the application instance. All standard MFC resources are selectively built or not built into your module, based on wizard selections. For dynamic link they are always part of the MFC80[u][d].dll.

See Also

Concepts

MFC Hierarchy Chart (http://msdn.microsoft.com/en-us/library/bb982033.aspx)

Reference

CMFCRibbonBar Class (http://msdn.microsoft.com/en-us/library/bb983906.aspx)

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