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

[Coda Highland]

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
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