[Qt-creator] Is there a Try and Catch method in QT

[Danny Price]

Catch them within the handler or in QApplication::notify()

http://strange-paradox.livejournal.com/4902.html

On Thu, Jul 1, 2010 at 2:35 AM, Coda Highland <coda at bobandgeorge.com> wrote:

> I know this is the wrong mailing list but I will caution that Qt is
> not exception-safe (and doesn't even have to be compiled with
> exception support enabled) and throwing exceptions through Qt code
> (for instance, in a slot or in an event handler) has negative effects.
> It's possible to safely use exceptions (QtConcurrent uses them
> internally for instance) but you need to make sure to catch them
> before it crosses Qt code.
>
> /s/ Adam
>
> On Wed, Jun 30, 2010 at 8:05 PM, Carter, Nathan <NCARTER at bentley.edu>
> wrote:
> >
> > This is actually the Qt-creator mailing list, not the Qt mailing list.
>  But
> > I'll answer your question anyway.  In the future, though, ask Qt
> questions
> > over there.  (It's called "qt-interest" and shows up if you search for
> that
> > term.)
> > The QString::toDouble() method does not throw an exception if it gets
> text
> > that's not a double.  Instead, it has the "ok" parameter to let you know
> > that information.  See the documentation (inside Qt-creator!) for
> > QString::toDouble() to see how to use the ok parameter to do your test,
> > instead of try-catch.
> > But yes, the very fact that your code compiled tells you that C++ (and
> hence
> > Qt) support try-catch structures.
> > Nathan
> >
> >
> > On Jun 30, 2010, at 9:01 PM, Diego Turcios wrote:
> >
> > Hi guys
> > I thinks this is the right mailing list for my doubt.
> > I am working on a small application in QT. But right now I have the
> > following problem.
> > I have a line edit, and I want to manipulate the values so only numbers
> > (doubles) can be written on this line edit.
> > I was trying something like this
> >
> >
> > double quantity;
> >  try
> >     {
> >         quantity=ui->LEPrecio->text().toDouble();
> >      }
> >     catch(QString error)
> >     {
> >         QMessageBox msgBox;
> >         msgBox.setText(error);
> >         msgBox.exec();
> >     }
> > After doing this. I am planning to manipulate the double value, but this
> > doesn't work. If I write hello world on the line edit. Supposly it
> converts
> > it, and it doesn't work. Any idea ;)
> >
> > Diego Turcios
> > DiegoTc
> > Ubuntu User  # 27518
> > -----------------------------------------------
> > Mis Blogs
> > http://diegoturcios.wordpress.com/
> > https://wiki.ubuntu.com/DiegoTurcios
> > ----------------------------------------------------------
> > Recuerden Dios siempre esta presente:
> > http://sagradocorazondejesus-diegotc.blogspot.com/
> > <ATT00001..txt>
> >
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> >
> >
>
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