Close Modeless or Modal dialogues onClose event of Dialog mfc

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In my MFC dialogue based application one situation is that first I open model dialog and click event of one of button of this dialog,it open main dialog which contains Initinstance and OnInitDialog method in it,so my question is whenever I close this first dialog onCancel event occur and in that event I called PostQuitMessage(),it closes application but slightly show next window and then close.I think this method is wrong!I any another method to do that?please suggest!
Thanks in advance!!

Posted 1-Aug-13 20:36pm

Venkat Raghvan

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Solution 2

Your design sounds wrong to me; why do you need a dialog to open your main dialog? A dialog application should only need a single dialog which opens automatically when the application starts. It may use other child dialogs during its lifetime but that is all that would be necessary.

Posted 1-Aug-13 21:01pm

Richard MacCutchan

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Venkat Raghvan 2-Aug-13 3:18am

Sorry!but it is necessary for project purpose!

Richard MacCutchan 2-Aug-13 3:25am

Then you need to understand and live with the consequences.

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Jochen Arndt · Accepted Answer · 2013-08-01T20:58:00

If you need a start dialog that is shown before your main dialog, just show this dialog from within InitInstance() and return upon Cancel:

BOOL CMyApp::InitInstance()
{
    // Common initialization

    // Show start dialog
    CStartDlg StartDlg;
    if (StartDlg.DoModal() == IDCANCEL)
        return FALSE;

    // Show the main dialog
    CMainDlg MainDlg;
    m_pMainWnd = &MainDlg;
    MainDlg.DoModal();
    return FALSE;
}

If you need to pass some data between the start dialog and your application, you can pass a pointer to your CMyApp class.

[EDIT: Added example to show how data can be passed]

BOOL CMyApp::InitInstance()
{
    // Common initialization

    // Create the main dialog instance and assign it to m_pMainWnd
    CMainDlg MainDlg;
    m_pMainWnd = &MainDlg;

    // Show start dialog
    CStartDlg StartDlg;
    if (StartDlg.DoModal() == IDCANCEL)
        return FALSE;

    // Show the main dialog
    MainDlg.DoModal();
    return FALSE;
}

void CStartDlg::OnOK()
{
    // Pass data to main dialog members here.
    // Note that the dialog window itself is not created yet.
    // So access only CMainDlg specific member variables 
    //  (no CWnd base class members).
    CMainDlg* pMainDlg = static_cast<CMainDlg*>(AfxGetApp()->m_pMainWnd);
//  pMainDlg->SomeVar = SomeValue;
    CDialog::OnOK();
}