Question

In my qt app I have this object, filled before setting up my QTreeWidget’s content:

QList<QTreeWidgetItem*> items; 

I fill the QList by this way:

QVariant qv; // I need this for 'attaching' to the item my linuxPackage object qv.setValue(linuxPackage); packRow->setData(1, Qt::UserRole,qv); // packRow is my own object inherited from QTreeWidgetItem, I 'put' the QVariant into it items.append(packRow); // then I put my item into the QList 

at the end of the work, my QList has almost 1000 items.

I need to iterate over them and for each item I need to get the ‘linuxPackage’ data by this (tested and working) way:

Pkg linuxPackage = this->data(1,Qt::UserRole).value<Pkg>(); // Pkg is my own class for the linuxPackage object 

So, I’ve been trying to extract needed data by this manner:

QList<QTreeWidgetItem*>::iterator iter;  for (iter = items.begin(); iter != items.end(); ++iter){     Pkg pack = iter->data(1,Qt::UserRole).value<Pkg>(); } 

But nothing works, I can not even get the program compiling. Help! 😀

Answer 1

Perhaps:

(*iter)->data(1,Qt::UserRole).value<Pkg>(); 

BTW, an easier way of doing this with Qt4:

foreach (const QTreeWidgetItem *item, items) {     Pkg pack = item->data(1,Qt::UserRole).value<Pkg>(); } 

at the very least, you should use const_iterators =)

QList<QTreeWidgetItem*>::const_iterator iter;  for (iter = items.constBegin(); iter != items.constEnd(); ++iter){     ... }