QVariant to QObject*

I'm trying to attach a pointer to an QListWidgetItem, to be used in the slot itemActivated.

The pointer I'm trying to attach is a QObject* descendant, so, my code is something like this:

Image * im = new Image();  
// here I add data to my Image object
// now I create my item
QListWidgetItem * lst1 = new QListWidgetItem(*icon, serie->getSeriesInstanceUID(),  m_iconView);
// then I set my instance to a QVariant
QVariant v(QMetaType::QObjectStar, &im)
// now I "attach" the variant to the item.
lst1->setData(Qt::UserRole, v);
//After this, I connect the SIGNAL and SLOT
...

Now my problem, the itemActivated slot. Here I need to extract my Image* from the variant, and I don't know how to.

I tried this, but I get the error:

‘qt_metatype_id’ is not a member of ‘QMetaTypeId’

void MainWindow::itemActivated( QListWidgetItem * item )
{
    Image * im = item->data(Qt::UserRole).value<Image *>();
    qDebug( im->getImage().toAscii() );
}

Any hint?

Image * im = item->data(Qt::UserRole).value<Image *>();