MFC and SDK???

[Leesen]

Hi,all Is the OnPaint function in MFC just the same as the content between BeginPaint and EndPaint in SDK???? Does the system create WM_PAINT after it receive WM_SETCURSOR? Now there are some problems in my application.I describe it simply just as below. Firstly: OnPaint() { LoadBigBitmap(); //can fill the whole client view if(m_flag) LoadSmallBitmap(); } OnLButtonDown() { m_flag=TRUE; Invalidate(FALSE); UpdateWindow(); } OnSetCursor() { // set my own Cursor and return TRUE } Then, when I run this application, errors occurrs. First, it display the BigBitmap . After I click down on the client view, then it would display the SmallBitmap,although,just for a while. then when I move the cursor the SmallBitmap will disappear. It disturbs me for long time, who can help me??? All your help will be appreciated! Regards.

[mloibl]

some extracts from the mfc-sources: CPaintDC::CPaintDC(CWnd* pWnd) { ... ::BeginPaint(m_hWnd = pWnd->m_hWnd, &m_ps); ... } CPaintDC::~CPaintDC() { ... ::EndPaint(m_hWnd, &m_ps); ... } void CView::OnPaint() { // standard paint routine CPaintDC dc(this); OnPrepareDC(&dc); OnDraw(&dc); } So you are right: BeginPaint begins within the constructor CPaintDC dc(this), EndPaint is called from within the destructor; it's called when the local CPaintDC goes out of scope and that's at the end of CView::OnPaint. If you look more precise at the sources, you'll find out that some extra work is done by MFC (OnPrepareDC, ...) Markus