Modelless

[Gldnguppy]

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?

[link]

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.

[Jim Mcpherson]

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:oDataExchange(CDataExchange* pDX)
{
CDialog:oDataExchange(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();