Modelless

Alright, I am using a Modelless dialog in my dialog project. I have made the instance of the modelless dialog a member variable of the main dialog so as to try to stop memory leaks. However, if I create, show, and exit the modelless dialog, and then try to create and show it again, I get an Assertion error. Is there a way to get around this?

Is your member variable a pointer? If so, make sure you're deleting it when exiting the dialog (OnDestroy). Then set the pointer to NULL.

If your putting it on the Heap (new), make sure you delete off the heap.



// WaitDlg.cpp : implementation file
//

#include "stdafx.h"
#include "cdi.h"
#include "WaitDlg.h"

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

/////////////////////////////////////////////////////////////////////////////
// CWaitDlg dialog


CWaitDlg::CWaitDlg(CWnd* pParent /*=NULL*/)
: CDialog(CWaitDlg::IDD, pParent)
{
//{{AFX_DATA_INIT(CWaitDlg)
m_clstrWait = _T("");
//}}AFX_DATA_INIT
}


void CWaitDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CWaitDlg)
DDX_Text(pDX, IDC_STATIC_WAIT, m_clstrWait);
DDV_MaxChars(pDX, m_clstrWait, 100);
//}}AFX_DATA_MAP
}


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

/////////////////////////////////////////////////////////////////////////////
// CWaitDlg message handlers

BOOL CWaitDlg::OnInitDialog()
{
CDialog::OnInitDialog();

m_clstrWait = "";
//SetDlgItemText(IDC_STATIC_WAIT, m_clstrWait);

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

void CWaitDlg::OnDestroyDlg()
{
DestroyWindow();
}

void CWaitDlg::SetWaitText(CString sztext)
{
UpdateData(TRUE);
m_clstrWait = sztext;
SetDlgItemText(IDC_STATIC_WAIT, m_clstrWait);
}


void CWaitDlg::PostNcDestroy()
{
CDialog::PostNcDestroy();
delete this;
}

////////////////////
// Header File
#if !defined(AFX_WAITDLG_H__BB9EBE31_1618_11D4_980E_00C0F028520E__INCLUDED_)
#define AFX_WAITDLG_H__BB9EBE31_1618_11D4_980E_00C0F028520E__INCLUDED_

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

/////////////////////////////////////////////////////////////////////////////
// CWaitDlg dialog

class CWaitDlg : public CDialog
{
// Construction
public:
CWaitDlg(CWnd* pParent = NULL); // standard constructor
void OnDestroyDlg();
void SetWaitText(CString sztext);
// Dialog Data
//{{AFX_DATA(CWaitDlg)
enum { IDD = IDD_DIALOG_WAIT };
CString m_clstrWait;
//}}AFX_DATA


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

// Implementation
protected:

// Generated message map functions
//{{AFX_MSG(CWaitDlg)
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_WAITDLG_H__BB9EBE31_1618_11D4_980E_00C0F028520E__INCLUDED_)



/////////////////////////
///// Call it from somewhere in your application

CWaitDlg* m_pwaitdlg;
m_pwaitdlg = new CWaitDlg;

int hStatusWnd; // Handle of Status modaless dlg

// Create Modaless Dialog
hStatusWnd = m_pwaitdlg->Create(IDD_DIALOG_WAIT);



if(!hStatusWnd)
{
return;
}

m_pwaitdlg->CenterWindow(NULL);
m_pwaitdlg->ShowWindow(SW_SHOW);
m_pwaitdlg->SetWaitText("Updating Devices in Group");
m_pwaitdlg->UpdateWindow();



// When Finished with it destroy and delete it
m_pwaitdlg->OnDestroyDlg();