I have been trying to insert directory names from the .txt file into treewidget for a while. I managed to access the file from the main.cpp section and find the part I wanted, but I don't know how to import it into the treewidget.

Main.cpp
#include "mainwindow.h"
#include<QApplication>
#include<QDir>
#include<QDebug>
#include<QTreeWidget>

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

QFile myFile("C:/Users/gozde/Desktop/gözde.txt");
myFile.open(QIODevice::ReadOnly);
QTextStream in (&myFile);
const QString content = in.readLine();

QString searchString("INCLUDE_DIRECTORIES(");
QString line;

do{
line = in.readLine();
if (!line.contains(searchString, Qt::CaseSensitive))
{
QString one = in.readLine();
}

}while(line!=")");

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

Before understanding what I need to do I am trying to create a treewidget with this ;

MainWindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include<QDir>
#include<QDebug>
#include<QStack>
#include<QFileDialog>

MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindow)
{
ui->setupUi(this);
displayTree();
}

MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::displayTree()
{
ui->treeWidget->setColumnCount(1);
QStringList labels;
labels<<"TASK1";
ui->treeWidget->setHeaderLabels(labels);

QTreeWidgetItem *VmsPtzControl= new QTreeWidgetItem(ui->treeWidget);
VmsPtzControl->setText(0,"VmsPtzControl");
VmsPtzControl->setCheckState(0,Qt::Unchecked);
ui->treeWidget->addTopLevelItem(VmsPtzControl);

QTreeWidgetItem *Includes= new QTreeWidgetItem();
Includes->setFlags(Includes->flags() | Qt::ItemIsUserCheckable | Qt::ItemIsSelectable);
Includes->setCheckState(0,Qt::Unchecked);
Includes->setText(0,"Includes");
VmsPtzControl->addChild(Includes);

QTreeWidgetItem *Cots= new QTreeWidgetItem();
Cots->setText(0,"Cots");
Includes->addChild(Cots);
Cots->setCheckState(0,Qt::Unchecked);

QTreeWidgetItem *VMS= new QTreeWidgetItem();
VMS->setText(0,"${VMS}");
Cots->addChild(VMS);

QTreeWidgetItem *VMS_U= new QTreeWidgetItem();
VMS_U->setText(0,"${VMS_U}");
Cots->addChild(VMS_U);