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LRESULT OnPaint       (HWND hWnd)
{
    PAINTSTRUCT ps;
    HDC            hdc;
    hdc = ::BeginPaint(hWnd, &ps);

    UINT index;
    for (index = 0; index < SHAPE_COUNT; index++)
    {
        if (ID_SHAPE_RECTANGLE == Shapes[index].shapeID)
        {
            ::Rectangle    (    
                        hdc, 
                        Shapes[index].rect.left, 
                        Shapes[index].rect.top, 
                        Shapes[index].rect.right,
                        Shapes[index].rect.bottom
                        );
        }
        else
        {
            ::Ellipse    (    
                        hdc, 
                        Shapes[index].rect.left, 
                        Shapes[index].rect.top, 
                        Shapes[index].rect.right,
                        Shapes[index].rect.bottom
                        );
        }
    }

    ::EndPaint(hWnd, &ps);

    return 0;    
}

CPaintDC::CPaintDC(CWnd* pWnd)
{
    ...

    if (!Attach(::BeginPaint(m_hWnd = pWnd->m_hWnd, &m_ps)))
        AfxThrowResourceException();
}

CPaintDC::~CPaintDC()
{
    ...

    ::EndPaint(m_hWnd, &m_ps);
    Detach();
}
 

CClientDC::CClientDC(CWnd* pWnd)
{
    ...

    if (!Attach(::GetDC(m_hWnd = pWnd->GetSafeHwnd())))
        AfxThrowResourceException();
}

CClientDC::~CClientDC()
{
    ...
    ::ReleaseDC(m_hWnd, Detach());
}