VirtualKeyboard, Program crash when input out of range char to a QLineEdit with validator

SGaist

Hi and welcome to devnet,

Can you show the stack trace of your crash ?
Do you have the same issue if you use a QRegularExpressionValidator ?

Anima

@SGaist said in VirtualKeyboard, Program crash when input out of range char to a QLineEdit with validator:

QRegularExpressionValidator

Thanks, SGaist.
And Yes. I tryed QRegularExpressionValidator and QIntValidator, still got the same result:

    m_pEdit->setValidator(new QRegularExpressionValidator(QRegularExpression(u8"^([0-9]|[1-9][0-9]{1,2})")));
//  m_pEdit->setValidator(new QIntValidator(0, 100));

And I noticed that, if I directly put the QLineEdit on MainWindow other than MyDialog, everything is OK.

Anima

The stack trace.

Anima

@SGaist
Do you have any suggestion? Thank you.

SGaist

What if you use the following:

MyDialog::MyDialog(QWidget *parent):
    QDialog(parent)
{
     m_pEdit = new QLineEdit(this);
     m_pEdit->setValidator(new QRegularExpressionValidator(QRegExp(u8"^([0-9]|[1-9][0-9]{1,2})")));
}
 
MyDialog::~MyDialog()
{
}

?

zhangqinagqiag

This problem also exists in 5.15.2，As long as it is a pop-up window and uses both virtual keyboard and physical keyboard, it will crash

SGaist

Which compiler are you using ?

Anima

@SGaist
Thanks.
The issue still exists after set the parent of MyDialog.
The compiler I'm using is Microsoft Visual C++ compiler 14.0.
I also tried MinGW 8.1.0 on Windows 10, got the same issue.

But on Ubuntu 18.04, the same program, built by Qt5.12.10 and g++, works fine. I think it may be a platfrom specific bug.

SGaist

Might be indeed.

One last test, what happens if you use open in place of exec ?

Anima

@SGaist
I modified the program as below, and still got the same result. Program crashed after I tapped illegal keys with physical keyboard.

void QtGuiApplication1::onBtnClicked()
{
    MyDialog* dlg = new MyDialog(this);
    dlg->open();
}

SGaist

Then I would say a bug report is the next step.

Anima

The issue is a known bug QTBUG-9304.
Unfortunately, it will not be fixed for Qt5.12.

SGaist

From the looks of the patch, you should be able to port it to 5.12 and build the module yourself with it.