Visual C++ 6.0 - OnInitDialog in a Derived CDialog class not working

Question

I have create a simple MFC appwizard dialog project. I used the Class Wizard to create a new class called CMyDlg based on CDialog. Then I went to the Message Map screen and doubleclicked on the WM_INITDIALOG entry to automatically create a CMyDlg::OnInitDialog() handler.

The problem I have is that CMyDlg::OnInitDialog() will not call. I have put a breakpoint in there and it simply will not call. The parent dialog's OnInitDialog() method gets called, but it will not call the CMyDlg::OnInitDialog() method.

Is there something special than needs to be done?

I have managed to implement a workaround which is to send a message of my own from the parent dialog's OnInitDialog() method and have it handled in CMyDlg but.. I'm sure this is not the way to do it..

// MyDlg.cpp : implementation file
//

#include "stdafx.h"
#include "DeriveDlgTest.h"
#include "MyDlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CMyDlg dialog

CMyDlg::CMyDlg( UINT nIDTemplate, CWnd* pParent /*=NULL*/)
    : CDialog(nIDTemplate, pParent)
{
  // PDS: THIS GETS CALLED
}

CMyDlg::CMyDlg(CWnd* pParent /*=NULL*/)
    : CDialog(CMyDlg::IDD, pParent)
{
    //{{AFX_DATA_INIT(CMyDlg)
        // NOTE: the ClassWizard will add member initialization here
    //}}AFX_DATA_INIT
}


void CMyDlg::DoDataExchange(CDataExchange* pDX)
{
    CDialog::DoDataExchange(pDX);
    //{{AFX_DATA_MAP(CMyDlg)
        // NOTE: the ClassWizard will add DDX and DDV calls here
    //}}AFX_DATA_MAP
}


BEGIN_MESSAGE_MAP(CMyDlg, CDialog)
    //{{AFX_MSG_MAP(CMyDlg)
    //}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMyDlg message handlers

BOOL CMyDlg::OnInitDialog() 
{
  // PDS: THIS DOES NOT GET CALLED
    CDialog::OnInitDialog();


    return TRUE;  // return TRUE unless you set the focus to a control
                  // EXCEPTION: OCX Property Pages should return FALSE
}


#if !defined(AFX_MYDLG_H__ECC7F6AC_FEB3_419D_AFE2_6B6DE8196D74__INCLUDED_)
#define AFX_MYDLG_H__ECC7F6AC_FEB3_419D_AFE2_6B6DE8196D74__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
// MyDlg.h : header file
//

/////////////////////////////////////////////////////////////////////////////
// CMyDlg dialog

class CMyDlg : public CDialog
{
// Construction
public:
    CMyDlg(CWnd* pParent = NULL);   // standard constructor
  CMyDlg( UINT nIDTemplate, CWnd* pParent = NULL);   // standard constructor
// Dialog Data
    //{{AFX_DATA(CMyDlg)
    enum { IDD = IDD_DERIVEDLGTEST_DIALOG };
        // NOTE: the ClassWizard will add data members here
    //}}AFX_DATA


// Overrides
    // ClassWizard generated virtual function overrides
    //{{AFX_VIRTUAL(CMyDlg)
    protected:
    virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
    //}}AFX_VIRTUAL

// Implementation
protected:

    // Generated message map functions
    //{{AFX_MSG(CMyDlg)
    virtual BOOL OnInitDialog();
    //}}AFX_MSG
    DECLARE_MESSAGE_MAP()
};

//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.

#endif // !defined(AFX_MYDLG_H__ECC7F6AC_FEB3_419D_AFE2_6B6DE8196D74__INCLUDED_)

---

Thanks Guys. I've uploaded the dummy project to the link below. Try building the project and you will find that CMyDlg::OnInitDialog() is never called.

I removed the IDD enum and constructor as advised above but it didn't make any difference at all. There is not CMyDlg dlg; dlg.DoModal() call as the main dialog itself it derived from CMyDlg as opposed to the usual CDialog class.

I still haven't solved this issue so any help would be appreciated.

Cheers

link text

Answer 1

You derive CDeriveDlgTestDlg from CMyDlg but inside CDeriveDlgTestDlg::OnInitDialog() you explicitly direct compiler to jump over base class and execute CDialog::OnInitDialog(), so CMyDlg::OnInitDialog() is never called.