Getting value from QTableWidgetItem - c++

Question

I want to set QTableWidgetItem's data as an image. imagePath may be different each time.
QTableWidgetItem *itemMedia = new QTableWidgetItem();
itemMedia->setTextAlignment(Qt::AlignCenter);
itemMedia->setData(Qt::DecorationRole, QPixmap(imagePath).scaled(width, 100, Qt::KeepAspectRatio, Qt::SmoothTransformation));
m_table->setItem(0,0,itemMedia);
m_table->setItem(0,1,itemMedia);
m_table->setItem(1,0,itemMedia);
m_table->setItem(1,1,itemMedia);
I've created it nicely. Next, I want to get data with this:
connect(m_table, SIGNAL(itemClicked(QTableWidgetItem *)), this, SLOT(onItemClicked(QTableWidgetItem *)));
void MUCSharedMedia::onItemClicked(QTableWidgetItem *item)
{
qDebug()<<"DecorationRole: " <<item->data(Qt::DecorationRole).toString();
qDebug()<<"DisplayRole: " <<item->data(Qt::DisplayRole).toString();
}
Actually I want imagePath in one of this role , but I get this line in Application Console:
DecorationRole: ""
DisplayRole: ""
How to get value? Any suggestion?
EDITED:
I want to show image on each QTableWidgetItem after that I want to store image path of images which I've shown.

Answer 1

If you need to store QString actually, you need DisplayRole two times:
itemMedia->setData(Qt::DisplayRole, imagePath);
qDebug()<<"DisplayRole: " <<item->data(Qt::DisplayRole).toString();
EDIT: if you need to show image and get image file path I suggest you another way:
1) Set image like you did:
itemMedia->setData(Qt::DecorationRole, QPixmap(imagePath).scaled(width, 100, Qt::KeepAspectRatio, Qt::SmoothTransformation));
2) Set image path using Qt::UserRole
itemMedia->setData(Qt::UserRole, imagePath);
When you need it:
qDebug()<<"File Path: " <<item->data(Qt::UserRole).toString();
But application will use image for displaying.

Answer 2

QTableWidgetItem::data() returns QVariant where you'll get the data with QVariant::value().
Alternatively, use QTableWidget::text().
http://doc.qt.io/qt-5/qtablewidgetitem.html

Answer 3

You store a QPixmap:
itemMedia->setData(Qt::DecorationRole, QPixmap(imagePath).scaled(width, 100, Qt::KeepAspectRatio, Qt::SmoothTransformation));
but try to extract it as a QString:
qDebug()<<"DecorationRole: " <<item->data(Qt::DecorationRole).toString();
That will always give you a default-constructed (i.e. empty) QString.
You want to retrieve it as a QPixmap:
item->data(Qt::DecorationRole).value<QPixmap>()
(though there's little point sending that to a QDebug stream!)
There's a good chance you want the original, unscaled pixmap. In which case, you'll need to store that as well, perhaps in Qt::UserRole:
itemMedia->setData(Qt::UserRole, QPixmap(imagePath));
and change the retrieval to match.