RE: Black Bitmap

From:

=?Utf-8?B?cG5zd2R2?= <pnswdv@discussions.microsoft.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Tue, 3 Mar 2009 11:39:01 -0800

Message-ID:

<E1FEADFE-43F6-424A-B68C-4CCA110ED55E@microsoft.com>

The bitmap is black because you haven't drawn anything on it.

FloodFill is an obsolete function. Try doing this:

br.CreateSolidBrush(RGB(255,0,0));
CBrush *pOldBrush = dcMemory.SelectObject(&br);
dcTemp.FillRect(&rect,&br);
dc->BitBlt(0,0,rect.Width(),rect.Height(),&dcMemory,0,0,SRCCOPY);
dcMemory.SelectObject(pOldBrush);

"nexolite" wrote:

Hi,
I have done the following
CDC dcMemory;
CBitmap m_Bmp;
void CCDrawFormView::OnDraw(CDC* dc)
{
        dcMemory.CreateCompatibleDC(dc);
        CRect rect;
        GetClientRect(&rect);
        m_Bmp.CreateCompatibleBitmap(&dcMemory,rect.Width(),rect.Height())
        dcMemory.SelectObject(&m_Bmp);

        //CBrush br(RGB(255,0,0));
        //dcMemory.SelectObject(&br);
        //dcMemory.FloodFill(0,0,RGB(255,255,255));

        dc->BitBlt(0,0,rect.Width(),rect.Height(),&dcMemory,0,0,SRCCOPY);
        CFormView::OnDraw(dc);
}
why I am getting a black screen ?
and also if I uncomment those lines I get black screen with some kind of
checked(grey and black in color) pattern.
Please help me.

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