Exception in MFC dialog message handler

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Hi
I have got an CInvalidArgException in OnSize() message handler of a CDialog class

C++

void CDlgTestAppDlg::OnSize(UINT nType, int cx, int cy)
{
    try
    {
        CDialog::OnSize(nType, cx, cy);
        m_txtImageCtrl.SetWindowText( _T( "0/0" ));
    }
    catch( CException *pExp_i )
    {
        // CInvalidArgException
        delete pExp_i;
        pExp_i = 0;
    }
}

here m_txtImageCtrl is an instance of CEdit, edit control is created in dailog resource. Problem is that OnSize() is called before creating the window( hWnd handle ) of the edit ctrl that is before OnInitDialog(). I have used Visual Studio 2008 for creating the application

Any idea about how to resolve this

Posted 11-May-10 23:35pm

Radhakrishnan G.

Updated 13-May-10 0:03am

Moak

v5

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Moak 13-May-10 6:02am

Updated subject and tags, hope this is what you are looking for.

3 solutions

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Sauro Viti · Answer 1 · 2010-05-13T00:12:00

Solution 2

Just replace:

C++

m_txtImageCtrl.SetWindowText( _T("0/0" ));

with:

C++

if (::IsWindow(m_txtImageCtrl.m_hWnd))
   m_txtImageCtrl.SetWindowText( _T( "0/0" ));

Posted 13-May-10 0:12am

Sauro Viti

#realJSOP · Answer 2 · 2010-05-11T23:41:00

Solution 1

OnSize is called several times during dialog startup. Just check to see if m_txtImageCtrl is null before doing anything with it.

Posted 11-May-10 23:41pm

#realJSOP

Radhakrishnan G. · Answer 3 · 2010-05-13T00:15:00

Solution 3

Yes,

I have too many controls to be subclassed with in the dialog,
Is any other way than checking the handle.

Now I used a boolean for this, it is set to true after CDialog::OnInitDialog()

Posted 13-May-10 0:15am

Radhakrishnan G.