Re: Print Preview Behavior in an MFC app

I found a partial old solution on CodeGuru, and followed up a lead from one
of the commenters
see:
<http://www.codeguru.com/cpp/w-d/doc_view/printing/comments.php/c3263/?thread=41430>

Now, what I ended up doing was in my CMDIChildDerived class I added a member
m_bPrintPreviewFrameHack.

and added this change of implmentation for is frame wnd.

BOOL CMDIChildDerived::IsFrameWnd() const
{
 return m_bPrintPreviewFrameHack ? FALSE : CMDIChildWnd::IsFrameWnd();
}

Then in my view class, I handle OnFilePrintPreview, where I get my parent
(the CMDIChildDerived class), and set it's hack flag, and then call the
CView::OnFilePrintPreview implementation.

My first try was to immediately set the flag back as the commenter suggests,
but that caused an assertion failure.

So, I decided to try overriding CView::OnEndPrintPreview, and setting it
back there, after calling the default.

The net effect is that while my program is in preview mode, I claim my
window isn't a frame wnd.

Obviously this will break if for whatever reason my code were to call
GetParentFrame inside print preview, but I don't do this in my code.

Maybe this will work for you too.

Anthony Wieser
Wieser Software Ltd