C / C++ / MFC

bloodwinner wrote:

what is the difference if I had not use it?

void Draw(CDC& dc)
{
    // Create a pen
    CPen pen;    
    pen.CreatePen(PS_SOLID, 2, RGB(255,0,0));
    // Select the pen into a DC
    dc.SelectObject(&pen);
    // Draw
    ...
    // LEAK!  Pen still selected into DC - remember that when a CPen goes out of scope,
    // the underlying pen HANDLE is automatically deleted.
}

void Draw(CDC& dc)
{
    // Save the current DC state
    int nState = dc.SaveDC();
    // Create a pen
    CPen pen;    
    pen.CreatePen(PS_SOLID, 2, RGB(255,0,0));
    // Select the pen into a DC
    dc.SelectObject(&pen);
    // Draw
    ...
    // Restore original DC state (pen, font, brush, etc.).
    dc.RestoreDC(nState);
}

Oliver123 wrote:

5. I think CScrollBar* pScrollBar can tell me which slider is active.

Oliver123 wrote:

IDC_SLIDER_VALUE CString m_SliderValue
IDC_SLIDER_VALUE2 CString m_SliderValue2

Oliver123 wrote:

But how do I determine which slider is active? How do I use CScroll* pScrollBar to determine which of the two sliders is sending the message?

void CExoSliderDlg::OnHScroll( UINT uSBCode, UINT uPos, CScrollBar *pScrollBar )
{
    CString strValue;
    strValue.Format("%u", uPos);
    
    if ((CSliderCtrl *) pScrollBar == &m_slider1)
        m_edit1.SetWindowText(strValue);
    else if ((CSliderCtrl *) pScrollBar == &m_slider2)
        m_edit2.SetWindowText(strValue);
    else
        CDialog::OnHScroll(uSBCode, uPos, pScrollBar);
}

Taset wrote:

I'm wishing to tweak the appearance of every form in my application. What I want is to change (for example) its border, scrollbar or caption's width/height...

mla154 wrote:

How do I attach the menu to the dialog box?

mla154 wrote:

I have created a dialog box and menu in the resource editor. How do I attach the menu to the dialog box? Any help is appreciated.

bloodwinner wrote:

look at "dc.SelectObject(&pen)" and "dc.SelectObject (&brush)",here no matter I use "&" or not it results the same. why is that?