Drawing to a Bitmap

From:
Scoots <linkingfire@msn.com>
Newsgroups:
microsoft.public.vc.mfc
Date:
Wed, 18 Nov 2009 15:07:46 -0800 (PST)
Message-ID:
<01f07cd9-e1c7-4c5a-a88d-0df93146b0a9@g27g2000yqn.googlegroups.com>
Hello all,

I have what I hope to be a simple question, but one that Google is
failing me on. Everything seems to describe the opposite of the
process, but I know that the information is out there somewhere.

I have an mfc application that with multiple CViews that I have draw
code set up for and everything works wonderfully when drawing to the
screen. Now, what I want to do, is create a bitmap, tell each of the
CViews to draw to that, and then saving it out to disk as a screen
capture. I want to go this route for several reasons, the biggest
being that I want to save these CViews even if they are ocluded by
other windows, though if this proves to be too difficult, a screenshot
would suffice I suppose.

My CView has draw code that looks like the following:

void CGraphicsView::OnDraw(CDC* pDCWnd)
{
    CGraphicsDoc* pModelDoc = GetModelDocument();
    ASSERT_VALID(pModelDoc);

    CDC *pDC = pDCWnd;
    OnPrepareDC(pDC);

    theApp.m_mtxDrawInProgress.Lock();

CRect rectClient;
    GetClientRect(&rectClient);

    CRect rectClip;
    pDCWnd->GetClipBox(rectClip);

    if (EqualRect(&rectClient, &rectClip))
    {
        if (m_bWasCovered)
        {
            m_bWasCovered = false;
            this->Invalidate(true);
        }
    }
    else
    {
        m_bWasCovered = true;
    }

    if (!pDC->IsPrinting())
        pDC->FillSolidRect(rectClip, RGB(204, 204, 204));

    if (pModelDoc->Model()->IsValid())
         pModelDoc->Model()->Draw(pDC, rectClip);

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