Modal dialog hides behind MDI application window : dialog, modal, mfc, mdi, window

May 17, 2008 08:53am pdt

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08.08.2007 at 08:15AM PDT, ID: 22749523

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6.2

Modal dialog hides behind MDI application window

Zones: Windows Programming, Windows MFC Programming, Microsoft Visual C++

Tags: dialog, modal, mfc, mdi, window

In my MFC MDI application a dialog (derived from CDialog) is to be displayed when a button on a view (derived from CFormView) is clicked. The problem is that the dialog sometimes hides behind the application window. This is very queer since a modal dialog should always be in front of its parent window (mainframe in this case). I tried SetWindowPos(&wndTop,...) in its OnInitDialog(). But it does not work. Please suggest what may be going wrong.
Thanks for you time.

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Question Stats

Zone: Programming

Question Asked By: Toofani

Solution Provided By: AndyAinscow

Participating Experts: 2

Solution Grade: B

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08.08.2007 at 09:45AM PDT, ID: 19655847

Rank: Sage

AlexFM:

Use pointer to View or Frame class in the dialog constructor. For example, to create dialof from CMainFrame class:

CMyDialog dlg(this);
dlg.DoModal();

08.08.2007 at 10:48PM PDT, ID: 19659953

Toofani:

Thanks AlexFM.
I have tried many tricks. I am passing the parent window too as suggested by you.
Further, I think if NULL is passed as the parent window argument in a dialog c'tor, the application's main window (mainframe in this case) is taken by default.
Do you have any other suggestion?
Thanks again.

08.09.2007 at 05:03AM PDT, ID: 19661372

Rank: Genius

AndyAinscow:

Does the mainframe have any settings such as TOPMOST ?

Is the view or dialog in a dll ?

08.13.2007 at 02:23AM PDT, ID: 19682317

Toofani:

Hi Andy,
The mainframe is not TOPMOST.
But the MDI application is invoked using CreateProcess() from another window application. Is anything special required for doing this?
Thanks for ur input.

08.13.2007 at 02:33AM PDT, ID: 19682351

Rank: Genius

AndyAinscow:

<CreateProcess() from another window application. Is anything special required for doing this?>

Nothing should be required - that should just start the application as if the user had started it.

again
Is the view or dialog in a dll ?

08.13.2007 at 03:42AM PDT, ID: 19682637

Toofani:

<Is the view or dialog in a dll ?>
No, the view or dialog are not in a dll.

08.13.2007 at 03:48AM PDT, ID: 19682655

Toofani:

If I call SetWindowPos(&wndTop) a couple of times using the OnTimer() event in the dialog , it works. Though this is just a workaround (a desperate one!!).
Further, if the application is executed from command-line (not invoked from other application), the problem does not occur.

08.13.2007 at 04:04AM PDT, ID: 19682746

Rank: Genius

AndyAinscow:

OK. Please post the CreateProcess code

08.13.2007 at 05:24AM PDT, ID: 19683262

Toofani:

Hi Andy
Here's the code I use to execute the app
LPTSTR lpCmd;
//Set lpCmd as Application exe path
STARTUPINFO si;
PROCESS_INFORMATION pi;
ZeroMemory(&si, sizeof(si));
ZeroMemory(&pi, sizeof(pi));
si.cb = sizeof(si);
CString strCrtDirectory = _T("");
//set working directory to strCrtDirectory
bResult = CreateProcess(NULL, lpCmd, NULL, NULL, FALSE, 0, NULL, strCrtDirectory, &si, &pi);
::::

08.13.2007 at 05:27AM PDT, ID: 19683283

Rank: Genius

AndyAinscow:

That looks pretty standard.

I'm puzzled.

Accepted Solution

20080236-EE-VQP-29 / EE_QW_2_20070628