mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow> // lines 5-14 for input
#include <QDialog>
#include <QTextEdit>
#include <QPushButton>
#include <QHBoxLayout>
#include <QVBoxLayout>
#include <QFile>
#include <QIODevice>
#include <QTextStream>

class MyClass:public QDialog  // class for writting
{
    Q_OBJECT

public:
    QPushButton *SaveButton;
    QHBoxLayout *Hlay;
    QTextEdit *textEdit;
    explicit MyClass(QWidget *parent = 0);
private slots:
    void writeToFile();

};

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();

private:
    Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"

void MyClass::writeToFile()
{
    QString fname = "C:\Users\morta\QT Projects\savename\out.txt";
    QFile file(fname);

    if(file.open(QIODevice::WriteOnly | QIODevice::Text))
    {
        QTextStream stream(&file);

    }
    file.close();
}

MyClass::MyClass(QWidget *parent):QDialog(parent)
{
    setWindowTitle("Title");
    SaveButton = new QPushButton;
    textEdit = new QTextEdit;
    SaveButton->setGeometry(50,100,150,80);
    Hlay = new QHBoxLayout;
    Hlay->addWidget(textEdit);
    SaveButton->setText("Save");


    Hlay->addWidget(SaveButton);
    setLayout(Hlay);

    QObject::connect(SaveButton, SIGNAL(clicked()), this, SLOT(writeToFile()));
}

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

}

MainWindow::~MainWindow()
{
    delete ui;
}

My results

Doing my Electric Engineer Senior project, I was given a Gui assignment, at the moment im stuck here. I need to store names in a .txt file and later on have them in a list format. This file is me practicing before I go to my main project. For some odd reason nothing saves in my out.txt even after closing Qt. I tried changing the directory where it should save but no luck.