Re: Strange problem initialising class members

From:
"Tom Serface" <tom.nospam@camaswood.com>
Newsgroups:
microsoft.public.vc.mfc
Date:
Fri, 23 Mar 2007 06:51:40 -0700
Message-ID:
<616AF677-62EE-40CF-9DE8-56088C2D1EE4@microsoft.com>
You might try

m_sizePage.cx = 0;
m_sizePage.cy = 0;

Or

m_sizePage.SetSize(0,0);

Tm

"Martin Hignett" <ocularsinister@gmail.com> wrote in message
news:1174649177.479185.22190@y80g2000hsf.googlegroups.com...

I have a strange problem initialise base class member variables. I
have the following classes:

class AFX_EXT_CLASS CChartView : public CAutoScrollView
{
protected:
   CChartView( );

   CSize m_sizePage;

}

class CServerChartView : public CChartView
{
public:
   CServerChartView( CServerDoc* pDoc );

}

CChartView::CChartView( )
{
   // m_sizePage full of random data
   m_sizePage = CSize( 0, 0 );
   // m_sizePage still full of same random data

}

CServerChartView::CServerChartView( CServerDoc* pDoc ) : CChartView( )
{
   // m_sizePage full of random data
   m_sizePage = CSize( 0, 0 );
   // m_sizePage still full of same random data

}

and in main(...)...

CServerChartView = new CServerChartView( pDoc );

The problem is m_sizePage never gets initialised. That is, the data in
m_sizePage never changes - not during the CChartView initialisation,
nor the CServerChartView initialisation. Even trying to initilise it
in OnDraw fails - no errors, no exceptions, but the data in the
variable remains unchanged. Why?

I am using Visual Studio 2005 with BoundsChecker installed. My first
thought was BoundsChecker or the debugger was somehow confused and
although the values didn't appear to change in the watch window, they
had actually changed. This does not appear to be the case - the
application behaves pretty strangely because this page size is a
_HUGE_ random number, and TRACE(...) reveals that the watch window is
accurate in this case.

Any pointers or clues gratefully received...

--
Martin Hignett

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