Re: changing font of a static text

From:

"Doug Harrison [MVP]" <dsh@mvps.org>

Newsgroups:

microsoft.public.vc.mfc

Date:

Wed, 22 Apr 2009 19:52:17 -0500

Message-ID:

<hhevu4ljl87ulipkrrlj4k843h6r8lhicu@4ax.com>

On Wed, 22 Apr 2009 17:28:29 -0700 (PDT), ssylee <stanigator@gmail.com>
wrote:

I am trying to change the font of a static text that I created in the
resource editor in Visual Studio. However, when I run the following
OnCreate function to change the font during initialization:

int UserControls::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
    if (CFormView::OnCreate(lpCreateStruct) == -1) return -1;

    // Get device context
    m_chdc = new CClientDC(this);

Why are you storing a persistent DC like this?

     CFont unitfont;
    unitfont.CreatePointFont(60, "MS Shell Dlg", m_chdc);
    unitlabel01.SetFont(&unitfont);

Now the font you do need to keep around for the lifetime of the control.
The CFont should be a class member.

     SetTimer(ADEPTHSLIDER, 1000, NULL); // sampling timer for showing
slider position

    return 0;
}

I encountered a runtime error as shown here (http://imagebin.org/
46581). The breakpoint that the assertion triggered is in this
function:

_AFXWIN_INLINE void CWnd::SetFont(CFont* pFont, BOOL bRedraw)
    { ASSERT(::IsWindow(m_hWnd)); ::SendMessage(m_hWnd, WM_SETFONT,
(WPARAM)pFont->GetSafeHandle(), bRedraw); }

I'm not sure what went wrong with my attempt to change the font. Some
pointers would be helpful.

There is a disconnect between the lifetime of C++ objects and Windows
HWNDs. The HWNDs don't exist or haven't been bound to the C++ objects at
the time you call SetFont. You should be doing this inside OnInitialUpdate,
which is the CFormView equivalent to OnInitDialog.

--
Doug Harrison
Visual C++ MVP