Re: Multiple BitBlts Eventually Crash. Why?
Thanks Joe,
I'll keep looking. By the way - thanks for all you do regarding this
newsgroup. I see that you do a lot of posting on a wide range of topics and
it's always very good information.
- Mark
"Joseph M. Newcomer" <newcomer@flounder.com> wrote in message
news:6jusa2telv05iq5jd59vku4kc1ucbnjc49@4ax.com...
Sounds like a resource leak. I don't see anything in this code, but you
might be losing
it somewhere else.
joe
On Fri, 7 Jul 2006 08:16:30 -0400, "MCM" <mcmalburg@digitalmetrology.com>
wrote:
I'm calling the following function in a timer. It draws a specific bitmap
from an array of bitmaps (animation approach)
After a few hundred calls I get an unhandled exception 0xC0000005 Access
Violation. When I try to debug it drops me on the line
"memDC.SelectObject(pOldBitmap) ;" and I see that pOldBitmap is
0x00000000.
What's going on?
- Mark
CBitmap m_bitmapArray[MAX_BITMAPS] ; // is defined in the class
the argument "nRef" is the reference to an array of bitmaps
///////////////////////////////////////////////////////////////////////////////
void CMyCtrl::ShowBitmapInRect (CDC *pDC, CRect rectTarget, int nRef)
{
if ((rectTarget.Width() != m_rectDraw.Width()) &&
(rectTarget.Height() != m_rectDraw.Height()))
return ;
if ((nRef < 0) || (nRef >= m_nSteps))
return ;
// make memory dc
CDC memDC ;
memDC.CreateCompatibleDC(pDC) ;
// grab the bitmap
CBitmap *pOldBitmap = memDC.SelectObject(&m_bitmapArray[nRef]) ;
// draw the memory dc
pDC->BitBlt(rectTarget.left, rectTarget.top,
rectTarget.Width(), rectTarget.Height(),
&memDC, 0, 0, SRCCOPY) ;
// release the bitmap
memDC.SelectObject(pOldBitmap) ;
} //ShowBitmapInRect
Joseph M. Newcomer [MVP]
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