Beginner question: forcing comma into point

[Rutschuru]

Hello,

how can I force LineEdit to replace comma into point?
I have to want make a little calculate-similar tool.

@
double value =
ui->lineEdit->text().toDouble(); // for Example: value is: 500 comma 32

calculateProcess() .....

backCasting()....
@

So I want to force lineEdit to casting the comma to point automaticly. How can I do that?

I cant use this:

@
QLocale current(QLocale("de_DE"));
current.setNumberOptions(QLocale::c().numberOptions());
QLocale::setDefault(current);
@

because I got diverse error-message :(

[Chris Kawa]

Hi,
You can subclass a "QValidator":http://qt-project.org/doc/qt-5.1/qtgui/qvalidator.html and implement the validate() method to do whatever string transformations you need. Then just set it on the QLineEdit with "setValidator()":http://qt-project.org/doc/qt-5.1/qtwidgets/qlineedit.html#setValidator

[raven-worx]

[quote author="Rutschuru" date="1386515682"]
because I got diverse error-message :([/quote]
What kind of error messages?

See "this":http://qt-project.org/doc/qt-4.8/qlocale.html#toDouble.
Also see QLocale::decimalPoint() and QLocale::groupSeparator() and make sure you have set the QLocale on the line edit.