Crash after updating from Qt4.3 to Qt4.4.0-rc1

[jpn]

Could you show us the backtrace from a debugger?

[steg90]

Sure can,

Here is the actual line the crash ends up at :

inline int size() const { return d->size; }

inline int size() const { return d->size; }

To copy to clipboard, switch view to plain text mode 

Which is in qstring.h

Stack trace :

QtCored4.dll!QString::size() Line 84 + 0xa bytes

QtCored4.dll!QString:perator==(const QString & other={...}) Line 1738 + 0x12 bytes

QtGuid4.dll!QSpinBoxPrivate::validateAndInterpret( QString & input={...}, int & pos=0x0045ee74, QValidator::State & state=0x00083ec4) Line 1011 + 0x16 bytes

QtGuid4.dll!QSpinBox::validate(QString & text={...}, int & pos=0x0045ee74) Line 479 + 0x18 bytes

QtGuid4.dll!QAbstractSlider::setValue(int value=0x00d41668) Line 511

DACanMonitor.exe!SliderDelegate::setEditorData(QWi dget * editor=0x05901790, const QModelIndex & index={...}) Line 55

QtGuid4.dll!QAbstractItemView::dataChanged(const QModelIndex & topLeft={...}, const QModelIndex & bottomRight={...}) Line 2805

QtGuid4.dll!QAbstractItemView::setIndexWidget(cons t QModelIndex & index={...}, QWidget * widget=0x05901790) Line 2731


Regards,
Steve

[jpn]

Can we see SliderDelegate::setEditorData() implementation?

[steg90]

Of course,

void SliderDelegate::setEditorData(QWidget *editor,
                                     const QModelIndex &index) const
{
	switch( index.column() )
	{
		case 1:
		{
			int value = index.model()->data(index, Qt::DisplayRole).toInt();
			QSlider *spinBox = static_cast<QSlider*>(editor);
			spinBox->setValue(value);
			break;
		}
		case 0:
		{
			QString value = index.model()->data(index, Qt::DisplayRole).toString();
			QCheckBox *checkbox = static_cast<QCheckBox*>(editor);
			if( value == "1" )
				checkbox->setCheckState( Qt::Checked );
			else
				checkbox->setCheckState( Qt::Unchecked );
			break;
		}
	}
}

void SliderDelegate::setEditorData(QWidget *editor,
                                     const QModelIndex &index) const
{
	switch( index.column() )
	{
		case 1:
		{
			int value = index.model()->data(index, Qt::DisplayRole).toInt();
			QSlider *spinBox = static_cast<QSlider*>(editor);
			spinBox->setValue(value);
			break;
		}
		case 0:
		{
			QString value = index.model()->data(index, Qt::DisplayRole).toString();
			QCheckBox *checkbox = static_cast<QCheckBox*>(editor);
			if( value == "1" )
				checkbox->setCheckState( Qt::Checked );
			else
				checkbox->setCheckState( Qt::Unchecked );
			break;
		}
	}
}

To copy to clipboard, switch view to plain text mode 

Looks like it is a simple case of checking whether value is zero in case 1.

Kind regards,
Steve

[jpn]

Looks like you static_cast something, which is not a QSpinBox, as QSpinBox. Rewrite it as using dynamic_cast or qobject_cast and check the return value.