Background process in Qt - c++

Question

I have been facing issues with a simple C++ group project I am working on. I am trying to create a thread that does a background job while my UI and the main app is working perfectly fine. I tried to the same thing on a test file before and it worked fine, however doing it in the Qt Project doesn't works somehow. I do not have much idea about Qt for ref. Here's my code. I am trying to update the progress bar repeatedly till my app runs.
Here's my code for more over view
test code
#include <thread>
#include <iostream>
#include <windows.h>
int getRamUsage() {
MEMORYSTATUSEX statex;
statex.dwLength = sizeof (statex);
GlobalMemoryStatusEx (&statex);
return statex.dwMemoryLoad;
}
void ramUsage() {
while (true) {
std::cout << "RAM usage: " << getRamUsage() << "%" << std::endl;
Sleep(1000);
}
}
int main() {
auto ramLoop = [=]() {
while (true) {
std::cout << "RAM usage: " << getRamUsage() << "%" << std::endl;
Sleep(1000);
}
};
std::thread t1(ramLoop);
t1.join();
}
It works, But it doesn't in the Front Ended Qt one I mentioned. May I know any other ideas to make this work.
mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "ramUsage.h"
#include <thread>
#include <windows.h>
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindow)
{
ui->setupUi(this);
auto ramLoop = [=]() {
while (true) {
ui->ramBar->setValue(getRamUsage());
Sleep(1000);
}
};
std::thread t(ramLoop);
t.join();
}
MainWindow::~MainWindow()
{
delete ui;
}
main.cpp
#include "mainwindow.h"
#include <stdio.h>
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}
ramUsage.cpp
#include <windows.h>
#include "../ramUsage.h"
int getRamUsage() {
MEMORYSTATUSEX statex;
statex.dwLength = sizeof (statex);
GlobalMemoryStatusEx (&statex);
return statex.dwMemoryLoad;
}
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow(QWidget *parent = nullptr);
~MainWindow();
private:
Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H
ramUsage.h
#pragma once
#ifndef RAMUSAGE_H
#define RAMUSAGE_H
int getRamUsage();
#endif // RAMUSAGE_H
I tried using QProcess and the basic threading options for windows which doesn't seem to work