Data not displaying on the QTreeView, QTableView,QListView classes

[JonB]

@thippu
As @VRonin asked, how do we know from the code you post what the scope/lifetime of your AddressbookModel instance is?

[thippu]

@JonB I did convert all the objects from stack memory to heap, I'm not getting what you need?

[thippu]

@JonB
And also I did modelTest, There was no error.

[thippu]

@JonB changed all to the heap, I think they will stay till application die, right?
code I have changed:

Widget::Widget(QWidget *parent)
: QWidget(parent)
{
QFile file("path");
if(!file.open(QIODevice::ReadOnly|QIODevice::Text))
{
qDebug()<<"can't access the file";
}
QString *addresses=new QString(QString::fromUtf8(file.readAll()));
Addressbookmodel *model=new Addressbookmodel(addresses,this);

QListView *listView=new QListView();
listView->setModel(model);
listView->setModelColumn(0);
listView->show();

QTreeView *treeView=new QTreeView;
treeView.setModel(model);
treeView.show();

QTableView *tableView=new QTableView;
tableView.setModel(model);
tableView.show();

setMiniumSize(800,400);
QVBoxLayout *Vlayout=new QVBoxLayout(this);
Vlayout->addWidget(listView);
Vlayout->addWidget(treeView);
Vlayout->addWidget(tableView);
}

[JonB]

@thippu

Addressbookmodel *model=new Addressbookmodel(addresses,this);
treeView.setModel(&model);
tableView.setModel(&model);

Now that model is a pointer, why the &s?

[thippu]

@JonB Sorry, typo mistake.

[thippu]

@JonB I did copy and paste from the early reply, So

[VRonin]

I'm surprised you don't get into stack overflow.
AddressbookModel::rowCount and AddressbookModel::columnCount form an infinitely deep tree.

You should return 0; if the parent argument isValid()

[thippu]

@VRonin okay,
In the Addressbookmodel.cpp
I changed the code to :

int Addressbookmodel::rowCount(const QModelIndex &parent) const
{
   if(parent.isValid())
{
  return 0;
}
return addressbook.count-2;
}


int Addressbookmodel::columnCount(const QModelIndex &parent)
const
{
  if(parent.isValid())
  {
   return 0;
  }
return addressbook.at(0).count();
}

I don't know why it is not used in the book and why am not getting data on the widgets still?.

[thippu]

@VRonin Can share me an example that helps me to understand how to create QTreeView model and subclass it?, so from this I can able to create my own models successfully.

[VRonin]

@thippu said in Data not displaying on the QTreeView, QTableView,QListView classes:

Can share me an example that helps me to understand how to create QTreeView model and subclass it?

http://doc.qt.io/qt-5/qtwidgets-itemviews-simpletreemodel-example.html

[thippu]

@VRonin , Thank you.