Problem with SelectObject in WM_ERASEBKGND

From:

Nash <jeevs007@gmail.com>

Newsgroups:

microsoft.public.vc.mfc,microsoft.public.win32.programmer.gdi

Date:

Mon, 25 Jun 2007 18:01:15 -0700

Message-ID:

<1182819675.917356.132910@n60g2000hse.googlegroups.com>

Hi,
I have a strange problem. I am creating a bitmap in wm_create and
using it in WM_ERASEBKGND

case WM_CREATE:
        {
            CDC *pDC = this->GetDC();
            m_bgdc.CreateCompatibleDC( pDC );

            bitmapObj.CreateCompatibleBitmap(pDC,
                                                MAIN_WINDOW_W,
MAIN_WINDOW_H);
            this->ReleaseDC(pDC);
            m_oldBmp = (CBitmap *)m_bgdc.SelectObject(bitmapObj);
        }

but after using it when i want to restore the old bitmap to the dc it
is crashing. pls help me to solve this issue.

case WM_ERASEBKGND:
{
CDC *pDC = CDC::FromHandle((HDC)wParam);
CRect r;
if ( m_iBkgBmpRes > ZERO )
{
CBitmap bmp;
CBrush brush;

HBITMAP bgBMP = NULL;
bgBMP = (HBITMAP)
LoadImage(AfxGetInstanceHandle(),MAKEINTRESOURCE(m_iBkgBmpRes),IMAGE_BITMAP,ZERO,ZERO,LR_DEFAULTCOLOR );

if (bgBMP)
{
if (bmp.Attach(bgBMP) > 0)
{
if (brush.CreatePatternBrush(&bmp) > 0)
{
    GetClientRect(&r);
pDC->FillRect(r,&brush);
m_bgdc.FillRect(r,&brush);

m_bgdc.SelectObject(m_oldBmp);//Crashing here

HANDLE handl=bmp.Detach();
BOOL b1=DeleteObject(handl);
BOOL b=brush.DeleteObject();
return TRUE;
}
}
}
}
}

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