// test.h
#pragma once
#include "stdafx.h"

QT_BEGIN_NAMESPACE
namespace Ui { class Form; };
QT_END_NAMESPACE

class Test : public QWidget 
{
    Q_OBJECT
public:
    Ui::Form* ui;
    Test(QWidget* parent = nullptr) : QWidget(parent), ui(new Ui::Form()) {
        ui->setupUi(this);
    }
};


// mainwindow
Test test = new Test(...);   // <-
Test test_2 = new Test(...); // <- all widgets from both `Test` contains same object name

There's another way to differentiate the widgets other than using their object names when saving their values to a settings.ini file?

If no, I'm looking for suggestions in how else I could achieve this, I mean, maybe appending a special character before each widget objectName?