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Editorial Team
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Asked: 2026-05-11T19:10:36+00:00

When I print the CDC for a report control that I’ve created it appears

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When I print the CDC for a report control that I’ve created it appears tiny (less than 1 square inch on paper). How can I get the report to be printed to occupy the entire page ?
Or in other words, how can I make the entire report to appear in one printed page.


CPrintDialog printDialog(FALSE);
printDialog.DoModal();

CDC dcPrint;
if(dcPrint.Attach(printDialog.GetPrinterDC()))
{
    int iHorzRes = dcPrint.GetDeviceCaps(HORZRES);
    int iVertRes = dcPrint.GetDeviceCaps(VERTRES);

    int iHorzResCDC = m_CDC.GetDeviceCaps(HORZRES);
    int iVertResCDC = m_CDC.GetDeviceCaps(VERTRES);

    dcPrint.m_bPrinting = TRUE;
            dcPrint.BitBlt(0,0, iHorzRes, iVertRes, &m_CDC, iHorzResCDC, iVertResCDC, SRCCOPY);
    CFont* pOldFont = dcPrint.SelectObject(&m_HeaderFont);
    dcPrint.TextOut(0,0,"HelloWorld")       ;
    dcPrint.SelectObject(pOldFont);

    CPrintInfo printInfo;
    printInfo.m_rectDraw.SetRect(0,0, iHorzRes, iVertRes);
    dcPrint.StartDoc("Report Print");       
    dcPrint.StartPage();
    if(dcPrint.EndPage())
        dcPrint.EndDoc();
    else
        dcPrint.AbortDoc();     
}

dcPrint.DeleteDC();

m_CDC is the memory DC that I use to buffer and display the entire report on screen.

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1 Answer

  1. Editorial Team

    As others have said, this is because, in general, the display resolution of printers is a lot higher than displays. Displays are usually 96 to 120DPI: at 96DPI this means that an image of 96 pixels (dots) by 96 pixels occupies approximately 1 square inch on the display. However, if you just take that image and print it out on a 600DPI printer, the size of the image will be about 1/6″ by 1/6″ – much smaller. This is a bane of the publishing world – images that look fine on displays often look either tiny or terrible when printed.

    You could, as has been suggested, use StretchBlt rather than BitBlt to scale up your image. Depending on the difference between your display and printer, this will either look a bit blocky, or utterly hideously blocky.

    A much better option is to rewrite your code that does the drawing of the control so that you’ve got a method that takes a device context (and some co-ordinates) and draws into it. Your normal window painting code can pass the memory DC to this routine and then BitBlt the result to the window, and your painting code can call this method with the printer DC and some suitable co-ordinates.

    When writing this routine you’ll have to worry about scaling: for example, you’ll need to create fonts for the given device context, and with a scaling-indepdendant size (that is, specify the font size in points, not pixels), rather than relying on a pre-created font.

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