generating tree using Qtreewidget

[kook]

i have a text file which contains data as fallows

1st column is message name, 2nd is message id and 3rd is parent id

i want to create a tree using this data i want to make the messages with parent id -1 as roots
and the other messages should become the chld based on their parent id (eg: message1_1 is a child of message1 since its parent id is 1)

i am very new to Qt and i really want some solution and guidelines on how to achieve my task (this may be very fundamental since i am new i am finding it difficult please help)

here is the code how i am trying to do it i am abe to create roots not sure how to create child item

MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindow)
{
ui->setupUi(this);
root = new QTreeWidgetItem(ui->treeWidget);
//ui->treeWidget->addTopLevelItem(root);
subroot = new QTreeWidgetItem();
child = new QTreeWidgetItem();

//opening file to read
QFile file("/home/textfiles/data.txt");

if (!file.open(QIODevice::ReadOnly))
{
    qDebug() << "file not opened";

}

 QTextStream stream(&file);
 QString line;

 while (stream.readLineInto(&line))
 {
     QStringList list = line.split(QLatin1Char('\t'), QString::SkipEmptyParts);
     qDebug()<<list;

     if (list.at(2) == "-1")
     {
         root = new QTreeWidgetItem(ui->treeWidget);
         root->setText(0,list.at(0));
     }
     else
     {


     }
 }

 file.close();

}

if this is not the right way i am open for suggestion
thanks in advance.

[eyllanesc]

@kook You just have to map the items:

#include <QApplication>
#include <QFile>
#include <QTreeWidget>

#include <QDebug>

bool buildTree(const QString & filename, QTreeWidget *treeWidget){
    QFile file(filename);
    if(!file.open(QIODevice::ReadOnly | QIODevice::Text)){
        qWarning() << file.error() << file.errorString();
        return false;
    }
    QMap<int, QTreeWidgetItem*> items;
    QTextStream stream(&file);
    QString line;
    while (stream.readLineInto(&line)){
        QStringList words = line.split(QLatin1Char('\t'), Qt::SkipEmptyParts);
        if(words.length() != 3){
            qWarning() << "content" << words << ", lenght:" << words.length();
            continue;
        }
        QTreeWidgetItem *item = nullptr;
        QString text = words.at(0);
        bool ok;
        int id = words.at(1).toInt(&ok);
        if(!ok){
            qDebug() << "id not is number";
            continue;
        }
        int parent_id = words.at(2).toInt(&ok);
        if(!ok){
            qWarning() << "parentId not is number";
        }
        if(parent_id == -1){
            item = new QTreeWidgetItem(treeWidget);
        }
        else if(items.contains(parent_id)){
            item = new QTreeWidgetItem(items[parent_id]);
        }
        else{
            qWarning() << "parentId: " << parent_id << "not found";
            continue;
        }
        if(item){
            item->setText(0, text);
            items[id] = item;
        }
    }

    return true;
}

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QTreeWidget w;

    buildTree("/home/textfiles/data.txt", &w);

    w.expandAll();
    w.show();
    return a.exec();
}

[kook]

This post is deleted!

[kook]

@eyllanesc thank you for the solution