以下代码是否有内存泄漏
BOOL CQQDlg::OnEraseBkgnd(CDC* pDC)
{
// TODO: 在此添加消息处理程序代码和/或调用默认值
CRect rect;
GetClientRect(&rect);
CDC memDC;
memDC.CreateCompatibleDC (pDC);
CBitmap bmp;
bmp.CreateCompatibleBitmap (pDC,rect.Width (),rect.Height ());
CBitmap *oldbmp=memDC.SelectObject (&bmp);
pDC->BitBlt (0,0,rect.Width (),rect.Height (),&memDC,0,0,SRCCOPY);
memDC.SelectObject (oldbmp);
bmp.DeleteObject ();
memDC.DeleteDC ();
return true;
}