segmentation fault after QTableWidget::sortItems

[Lykurg]

Hi,

I fill a QTableWidget in scope:

{
    [...]
    wdg_check *wdgl_check = new wdg_check();
    ui.languages->setCellWidget( currentRow, 2, wdgl_check );
    QObject::connect( ui.languages->cellWidget(currentRow,2), SIGNAL(newSelection()), this, SLOT(page1_selection_change()) );
    [...]
    QTableWidgetItem *newItemC = new QTableWidgetItem( i.value()["ol"]+"-"+i.value()["fl"] );
    ui.languages->setItem( currentRow, 6, newItemC);
}
// ui.languages->sortItems( 6, Qt::AscendingOrder );

{
    [...]
    wdg_check *wdgl_check = new wdg_check();
    ui.languages->setCellWidget( currentRow, 2, wdgl_check );
    QObject::connect( ui.languages->cellWidget(currentRow,2), SIGNAL(newSelection()), this, SLOT(page1_selection_change()) );
    [...]
    QTableWidgetItem *newItemC = new QTableWidgetItem( i.value()["ol"]+"-"+i.value()["fl"] );
    ui.languages->setItem( currentRow, 6, newItemC);
}
// ui.languages->sortItems( 6, Qt::AscendingOrder );

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where ui.languages is a QTableWidget and i.value() a QMap<QString, QString>. wdg_check is a simple Widget with a QCheckbox, which emit the SIGNAL newSelection(), when the state of QCheckbox is changed. And wdg_check provides the function getStatus(), which returns wether the QCheckBox is checked or not (bool).

so I have defined the connection-slot as:

void dgl_newBin::page1_selection_change()
{
  for (int i = 0; i < ui.languages->rowCount(); ++i)
  {
    bool state = static_cast<wdg_check*>(ui.languages->cellWidget(i,2))->getStatus();
  }
  // (I have all stuf deleted, which doesn't cause the Problem)
}

void dgl_newBin::page1_selection_change()
{
  for (int i = 0; i < ui.languages->rowCount(); ++i)
  {
    bool state = static_cast<wdg_check*>(ui.languages->cellWidget(i,2))->getStatus();
  }
  // (I have all stuf deleted, which doesn't cause the Problem)
}

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Ok, if I run the application with that code, all works, but if I uncomment the line "ui.languages->sortItems( 6, Qt::AscendingOrder );" I get an segmentation fault at the line "bool state = static_cast<wdg_check*>(ui.languages->cellWidget(i,2))->getStatus();".

Why? Isn't ui.languages->cellWidget(i,2) valid after sorting?

Thanks,
Lykurg

[jpn]

wdg_check is a simple Widget with a QCheckbox, which emit the SIGNAL newSelection(), when the state of QCheckbox is changed. And wdg_check provides the function getStatus(), which returns wether the QCheckBox is checked or not (bool).

If checkbox behaviour is all you need, you could simply use:
QTableWidgetItem::setCheckState()
[Edit] All items have a "checkable" flag by default, but as I recall, in case you want a checkbox to appear, you need to initialize those cells to a certain check state with the above method.

I get an segmentation fault at the line "bool state = static_cast<wdg_check*>(ui.languages->cellWidget(i,2))->getStatus();".

Apparently the cast fails. You should always check the pointer after casting.
I'm not sure about the sorting problem, though..

[Lykurg]

QTableWidgetItem::setCheckState()

Ok, than I take the easy way :-) (and now I am able to sort)

Don't why I was geting the segmentation fault, but it dosn't matter anymore, because QTableWidgetItem::setCheckState() works just fine.

Thanks