BUG: Multiple CRichEditView::PrintInsideRect's Are Distorted

ID: Q153239

The information in this article applies to:

The Microsoft Foundation Classes (MFC), included with:
- Microsoft Visual C++, 32-bit Editions, versions 4.0, 4.1, 4.2, 5.0, 6.0

SYMPTOMS

When you use CRichEditView::PrintInsideRect() more than once during printing, the text printed by calls after the first one appears either distorted or missing in Print Preview mode.

CAUSE

The PrintInsideRect() scales the window extents of the DC before formatting and printing the requested text to that DC. This scaling is necessary and works for the first call. However, PrintInsideRect() does not undo the scaling before returning. Hence, the scaling will be cumulative, causing future prints to be distorted or scaled out of the visible portion of the DC.

RESOLUTION

Save the DC before calling PrintInsideRect(), and restore it after returning. Refer to the "Sample Code" section of this article for details.

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. We are researching this bug and will post new information here in the Microsoft Knowledge Base as it becomes available.

Sample Code

Here is an example of making multiple PrintInsideRect calls per page using SaveDC() and RestoreDC() to keep the scaling from accumulating:


   void CThatSillyRichEditView::OnPrint(CDC* pDC, CPrintInfo* pInfo)
   {
       // Get the current paper size and construct an actual printing
       // rectangle by leaving out one half inch margin from each side.
       CSize sizePaper = GetPaperSize();
       CRect rectMargins(720, 720, sizePaper.cx - 720, sizePaper.cy - 720);

       // Need to set the margins when printing from CRichEditView
       SetMargins(rectMargins);

       // Set up three rectangular regions spaced an inch apart
       CRect rectHeader(0, 0, rectMargins.right, 1440);
       CRect rectBody(0, 1440, rectMargins.right, 1440 * 2);
       CRect rectFooter(0, 1440 * 2, rectMargins.right, 1440 * 3);

       // Format the first 10 characters in the buffer.
       int nSavedDC = pDC->SaveDC();
       PrintInsideRect(pDC, rectHeader, 0, 10, TRUE); // characters 0-10
       pDC->RestoreDC(nSavedDC);

       // Format the second 10 characters in the buffer.
       nSavedDC = pDC->SaveDC();
       PrintInsideRect(pDC, rectBody, 10, 20, TRUE); // characters 10-20
       pDC->RestoreDC(nSavedDC);

       // Format the third 10 characters in the buffer.
       nSavedDC = pDC->SaveDC();
       PrintInsideRect(pDC, rectFooter, 20, 30, TRUE); // characters 20-30
       pDC->RestoreDC(nSavedDC);
   }

Additional query words: MfcPrinting

Keywords : kbprint kbMFC kbVC400bug kbVC410bug kbVC420bug kbVC500bug kbVC600bug
Version : 4.0,4.1,4.2,5.0,6.0
Platform : NT WINDOWS
Issue type : kbbug