[Qt-interest] adressing something to the mainWindow from a dialog

[Tiago Correia]

Hi,
You can access the main application by using the global variable qApp, then
you can use activeWindow static method to get the active window.

You can also subclass QApplication, to have your own method to have a
pointer to your main window, then you could access it.

On Tue, Apr 7, 2009 at 9:13 AM, Giancarlo Amati
<ilferraresebono at hotmail.it>wrote:

>  I'm afraid  u didn't understand the question...probably my fault.
> QT as well as MFC they have they're own scoping for the variable through
> the application due to different mechanism
> Moreover, having more than 10 years experience in C++ programming with a
> Computer Science degree and PHD I appreciate your effort in reminding me the
> basic rules of C++ (of course my question wasn't on that).
> Basically the question was if I have a class of mine derived from any of QT
> class I can always have the access to a pointer which points to the main
> windows/application as in MFC there is this mechanism while it doesn't
> exists expicitly in QT....
>
> Best Regards.
> Giancarlo Amati
>
> > From: alex at wai.com
> > To: qt-interest at trolltech.com
> > Date: Mon, 6 Apr 2009 16:05:28 -0700
> > Subject: Re: [Qt-interest] adressing something to the mainWindow from a
> dialog
>
> >
> > Please take into the count that correctly asked question is at least half
> of a right answer. And I afraid I might not understand it right.
> >
> >
> > So asssume you have vaiable 'var' in your MainWindow class.
> >
> > class MainWindow
> > {
> > ...........
> > int var;
> > ...........
> > }
> >
> > Remember that variable 'var' makes sence only withing MainWindow object.
> > Even you have only one object, you should have allocate it somewhere,
> probably like this:
> >
> > MainWindow* mainWindow = new ........;
> >
> > So first thing you need is a pointer to your mainWindow object.
> > How you get it, depends on the code, here I would assume that you can
> access it, by storing the pointer in a global variable. (I don't recommend
> this way, it is just chosen for simplicity).
> >
> >
> > Once you have an access to a pointer to MainWindow object in your module
> (a dialog window):
> >
> > - if var variable is public, you can get and set it directly, like
> mainWindow->var = 3; int mainWindow->var = 4;
> > - if it is protected or private, you can either add public methods
> (functions) to MainWindow which will return or set value of val, etc.
> >
> >
> > Now I hope this helps.
> > But I would ask you to remember that QT interest forum is not a place for
> basic C++ questions.
> > The reason is that most of people read and post here in their free time.
> > And they don't like to dig through non-qt related questions all the time,
> because they were currently interested in specific product, even they were
> willing to help you.
> > There are special forums for C++ beginners. Try to find one. You might
> find much more help there too.
> >
> > Best regards,
> > Alex
> >
> >
> > ________________________________________
> > From: qt-interest-bounces at trolltech.com [mailto:
> qt-interest-bounces at trolltech.com] On Behalf Of Giancarlo Amati
> > Sent: Monday, April 06, 2009 9:17 AM
> > To: qt-interest at trolltech.com
> > Subject: [Qt-interest] adressing something to the mainWindow from a
> dialog
> >
> > Hello everybody,
> >
> > i have this problem, I have a dialog windows from where I want to adress
> a variable which beloges to may MainWindow class linked to the main
> application. Is there a way to do it?
> >
> > Kind regards.
> > Giancarlo
> > ________________________________________
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> >
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Tiago Correia
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