MFC Dialog Display issue

Question

Hi
In my app I have dialog I want when it is displayed just it activate and come on other windows (other apps) but my problem is the my application window (main frame) is also come on to other windows. How solve it?
I changes dialog style to Overlapped or Popup but not works! Also I set parent parameter to null but not works.
I use this code:

CMyDialog* pdlg = new CMyDialog(this);
if (pdlg->Create(this))
{
   pdlg->ShowWindow(SW_SHOW);
   pdlg->SetActiveWindow();
   pdlg->SetForegroundWindow();
}

Thanks

Answer 1

Hi @drjackool ,

I suggest you try to set the parent window of the dialog box to the computer desktop, so that the desktop is displayed when the dialog box is called. You could refer to my code.

Mydlg = new MyDlg;  
Mydlg->Create(IDD_DIALOG, GetDesktopWindow());  
Mydlg->ShowWindow(SW_SHOWNORMAL);  

Best regards,

Elya

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Answer 2

When creating a modeless MFC dialog MFC sets the application's main frame window as the dialog's Owner window (not Parent). And since an owned window always appears over its owner that is why the application main frame window behaves as you have observed.

I have tested @YujianYao-MSFT solution to pass MFC's GetDesktopWindow() function call as the second parameter to the dialog's Create function and it achieves the desired results for me.

However, if for whatever reason you have not had success that way then here is an alternative method to change the Owner window of an MFC modeless dialog so that it is a top level window and not an owned window.

Error checking omitted -

    CMyDialog* p = new CMyDialog;  
    p->Create(IDD_MYDIALOG);  
    ::SetWindowLongPtr(p->GetSafeHwnd(), GWLP_HWNDPARENT, NULL);  
    p->ShowWindow(SW_SHOW);  
  

Answer 3

Hello,
setting the parent parameter to NULL makes the main frame window the parent.
When you activate a dialog in an SDI or MDI application, the application gets active and is set to the foreground by Windows. If you don't want the main frame window to get on top, you must change the z-order of the mainframe to the bottom (AfxGetMainWnd()->SetWindowPos) or hide it (AfxGetMainWnd()->ShowWindow(SW_HIDE)).
Regards, Guido

Answer 4

Maybe do you want like this?

// App command to run the dialog
void CMFCApplication1App::OnAppAbout()
{
    CAboutDlg aboutDlg;

    this->m_pMainWnd->ShowWindow(SW_HIDE);
    aboutDlg.DoModal();
    this->m_pMainWnd->ShowWindow(SW_SHOW);
}