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

[Carter, Nathan]

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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