how to add children to the QTree Widget

[ManiRon]

@mrjj ok where i can see this message sir?

[mrjj]

@ManiRon
in the Creator output pane.
below where code is.

[ManiRon]

@mrjj my anogther doubt is

I am trying to view the data in a list . i have specified already

[ManiRon]

@mrjj

And i have another doubt .
I am trying to see the data which i have inserted into my QList . I can see the size but i cannot see the data.

Code:

QList<QString> m_Data;
for(int i=1;i<3;i++)
{
Data = QString("SubItem"+QString::number(i));
m_Data.append(Data.toLatin1().constData());
QString H = m_Data.at(i); //trying to see data
qDebug()<<"Data"<< m_Data.at(i);
}

while running the application crashesdonno why

[mrjj]

@ManiRon
Hi
what you mean u can see the size but not the data?

qDebug()<<"Data"<< m_Data.at(i); <<< u print index from 1,2,3
but u call append so first call, there is data in zero
but u print 1
then next loop
you print from 2, but only data in 0,1
and so on.
it starts in zero. so adjust the for loop.

for(int i=0;i<2;i++)
{
Data = QString("SubItem"+QString::number(i+1));
m_Data.append(Data.toLatin1().constData());
qDebug()<<"Data"<< m_Data.at(i);  //trying to see data
}

[ManiRon]

@mrjj said in how to add children to the QTree Widget:

but

if i give

int i = m_data.size();
and print the i value , I can see the data size that which i have inserted in the list.

But if i try to see the data

QString H = m_data.at(i);
and print the H value using qDebug i data is not coming and the application crashes

[mrjj]

@ManiRon
Yes, you access to high index.
as u start with 1.
and list start with zero.
So that can crash.

[ManiRon]

This post is deleted!

[ManiRon]

@mrjj but my size is two. I have inserted two data and i am trying to see the second data then it should work right?

[ManiRon]

@ManiRon OK SIR IT WORKED

[ManiRon]

@mrjj

I have another doubt sir

[mrjj]

@ManiRon
super :)
ask away :)

[ManiRon]

@mrjj

How to use this ? for this only i am trying

[ManiRon]

@mrjj What is my doubt is i want to add N number of children to a toplevelitem and one child to each child ? How can i add N Number of childern first

[mrjj]

@ManiRon
Its a list of QTreeWidgetItems * ( pointers)
So you must add them to a QList then give QList to tree.
Its just a function to add multiple items at once.

// top one
    QTreeWidgetItem *treeItemROOT = new QTreeWidgetItem(ui->treeWidget);
    treeItem->setText(0, name);
    treeItem->setText(1, description);

// first child
    QTreeWidgetItem *treeItem = new QTreeWidgetItem();
    treeItem->setText(0, name);
    treeItem->setText(1, description);

    treeItemROOT ->addChild(treeItem); // add child to the root

[ManiRon]

@mrjj said in how to add children to the QTree Widget:

treeItem

thats what can u give any example code for that "Its a list of QTreeWidgetItems * ( pointers)
So you must add them to a QList then give QList to tree."

[mrjj]

@ManiRon
QList<QTreeWidgetItem> mylist;
mylist.append( new QTreeWidgetItem); // might want to set some text also
..
...
call addChildren with mylist.

However, it wont help you build the tree, just other way of adding more than one item at a time.

[ManiRon]

@mrjj

My idea was to insert a list of data as a children to a toplevelitem

[ManiRon]

@mrjj

I gave like this QList<QTreeWidgetItem>m_Data;
m_Data.append(new QTreeWidgetItem);

it throwed error saying

error: no matching function for call to 'QList<QTreeWidgetItem>::append(QTreeWidgetItem*)'
m_Data.append(new QTreeWidgetItem);
^

[mrjj]

Hi
List must be of pointers.
QList<QTreeWidgetItem *>
(u missed the *)