Advanced MFC Programming

Chapter 10. Bitmap
BITMAP bm;
……
}
if(m_bmpBkd.GetSafeHandle() == NULL)
{
m_bmpBkd.LoadBitmap(IDB_BITMAPBKD);
m_bmpBkd.GetBitmap(&bm);
m_bmpBkd.SetBitmapDimension(bm.bmWidth, bm.bmHeight);
ASSERT(m_bmpBkd.GetSafeHandle());
}
CScrollView::OnInitialUpdate();
The bitmap can also be loaded in the constructor of CGDIView.
To paint the background of a window, we need to handle message WM_ERASEBKGND and implement
background drawing by ourseleves in the message hanlder. In the sample, this message handler is added
through using Class Wizard, and the corresponding function is implemented as follows:
BOOL CGDIView::OnEraseBkgnd(CDC* pDC)
{
CDC dcMem;
CBitmap *pBmpOld;
int i, j;
int nRepX, nRepY;
CRect rect;
CSize size;
CPoint pt;
}
pt=GetScrollPosition();
dcMem.CreateCompatibleDC(pDC);
pBmpOld=dcMem.SelectObject(&m_bmpBkd);
size=m_bmpBkd.GetBitmapDimension();
GetClientRect(rect);
rect.right+=pt.x;
rect.bottom+=pt.y;
nRepX=(rect.Width()+size.cx-1)/size.cx;
nRepY=(rect.Height()+size.cy-1)/size.cy;
for(i=0; i