QFileDialog failed by ueing Keyboard

[ckvsoft]

Hi

I'm using QT5 from Ubuntu 16.04 and have troubles when i use the keyboard.
Qt Version 5.5.1.

When i select all Buttons or Files with the Mouse it works fine, but when i to the work with the Keyboard and press Enter i got a SIGSEGV
by using getSaveFileName. getExistingDirectory works fine.


The inferior stopped because it received a signal from the operating system.
Signal name : SIGSEGV
Signal meaning : Segmentation fault

void ExportDialog::onExportButton_clicked()
{
    QSettings settings(QSettings::IniFormat, QSettings::UserScope, "XX", "XX");
    QString lastUsedDirectory = settings.value("lastUsedDirectory", QDir::currentPath()).toString();
 
    if (m_saveTodir) {
        m_filename = QFileDialog::getExistingDirectory(this, tr("Save to ..."),lastUsedDirectory);
    } else {
        m_filename = QFileDialog::getSaveFileName(this, tr("save"), lastUsedDirectory, "CSV (*.csv)");
    }
 
    if (m_filename.isNull())
        return;
 
    settings.setValue("lastUsedDirectory", m_filename);
 
    QDialog::accept();
 
}

void ExportDialog::onExportButton_clicked()
{
    QSettings settings(QSettings::IniFormat, QSettings::UserScope, "XX", "XX");
    QString lastUsedDirectory = settings.value("lastUsedDirectory", QDir::currentPath()).toString();

    if (m_saveTodir) {
        m_filename = QFileDialog::getExistingDirectory(this, tr("Save to ..."),lastUsedDirectory);
    } else {
        m_filename = QFileDialog::getSaveFileName(this, tr("save"), lastUsedDirectory, "CSV (*.csv)");
    }

    if (m_filename.isNull())
        return;

    settings.setValue("lastUsedDirectory", m_filename);

    QDialog::accept();

}

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Can you tell me what i'm doing wrong?

[anda_skoa]

Your code looks fine.
Did you have a look at the stack trace of the crash?

Is your application showing the Qt file dialog or a native one?

Cheers,
_

[ckvsoft]

It's in both case's Native and not Native.

But i see after new Debug and rewrite the code some times the crash comes after the QDialog::accept()

It's not the QFileDialog, it's a QMessageBox after the QDialog::accept() in parent Class. Sorry

I do not see why, but when i do a delete ExportDialog before i call the QMessageBox it seems to work.

Workflow

new ExportDialog
if (ExportDialog ....)
QMessageBox will send the SIG

But

new ExportDialog
if (ExportDialog ....)
delete ExportDialog;
QMessageBox will work.


Strong but why it work when i walk through the FileDialog with Mouseclicks.

So the Error is not QFileDialog alone. It's only when i use in parent class a QMessagebox before i delete the Dialog.

[anda_skoa]

Very strange.

Can you provide a compilable minimal example that shows that behavior?

Cheers,
_