[Qt-interest] Problems with Multiple QApplications

[Nitin Mahajan]

Hello,


----- Original Message ----
> From: "Malyushytsky, Alex" <alex at wai.com>
> To: "qt-interest at trolltech.com" <qt-interest at trolltech.com>
> Sent: Tuesday, November 3, 2009 3:59:29
> Subject: Re: [Qt-interest] Problems with Multiple QApplications
> 
> If you look at detailed description of QApplication class :
> http://doc.trolltech.com/4.5/qapplication.html
> You will find that a lot of things which point that there should be only single 
> instance of QApplication in each application.
> Starting with:
> "The QApplication object is accessible through the instance() function which 
> return a pointer equivalent to the global qApp pointer." ( only ONE global 
> pointer, not many)
> 
> You may continue with:
> "QApplication's main areas of responsibility are...."
> 
> It is just designed this way.
> It does not matter which system you are running on.
> It has nothing to do how many widgets/windows you have opened in the same time.
> 
> 
> If you use 2 QApplication instances it either you should have 2 different 
> executables or 2 separated widgets.
My mail says that I am running two different executables. Please read the mail carefully.

> In the first case split your project.
> In the second add as many widgets/ storage classes you need, nobody is limiting 
> you.
> 
> >> QApplications in Qt is not supported by design and why at all it is required? 
> How can I understand this more clearly?

I said I am running two different QApplications, meaning in two different processes. I also 
understand that having two QApps in a single executable is not required.

regards

-Nitin
> -----Original Message-----
> From: qt-interest-bounces at trolltech.com 
> [mailto:qt-interest-bounces at trolltech.com] On Behalf Of Nitin Mahajan
> Sent: Sunday, November 01, 2009 2:46 AM
> To: qt-interest at trolltech.com
> Subject: [Qt-interest] Problems with Multiple QApplications
> 
> Hello,
> 
> Can someone help me understand what are the problems in running multiple 
> QApplications on Qt for Embedded Linux? Please point me to some documentation of 
> mailing-list threads.
> 
> While going through some of the mails in mailing lists, I have seen some 
> comments which say that, running multiple QApplications in Qt is not supported 
> by design and why at all it is required? How can I understand this more clearly?
> 
> However, while reading the document "Qt for Embedded Linux Architecture" I did 
> not find anything which says that we should not run multiple QApplication 
> instances at the same time.
> 
> I am executing two QApplications on a Embedded Linux platform (not a PC) and  
> one of them in Full Screen mode.The one which is in FullScreen mode it is not 
> getting keyboard focus, even though it receives mousePress events. If same app 
> is run in normalMode, it gets the mousepress event followed by focusInEvent. Can 
> somebody provide pointers on it?
> 
> regards
> 
> -Nitin
> 
> 
> 
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