Problem with QTimer : the function that would be load is not load!

[lifedj]

Hi, I have a problem in using QTimer.
I'm trying to use this piece of code, but I don't know why the function "cameraTimerTimeout()" doesn't start:

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QMainWindow>
#include <QTimer>
#include <iostream>
 
namespace Ui {
class MainWindow;
}
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
 
private slots:
    void on_pushButton_clicked();
    void cameraTimerTimeout();
    void cattura();
 
private:
    Ui::MainWindow *ui;
    QTimer cameraTimer;
};
 
#endif // MAINWINDOW_H

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QTimer>
#include <iostream>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT
    
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
    
private slots:
    void on_pushButton_clicked();
    void cameraTimerTimeout();
    void cattura();

private:
    Ui::MainWindow *ui;
    QTimer cameraTimer;
};

#endif // MAINWINDOW_H

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main.cpp

#include <QtGui/QApplication>
#include "mainwindow.h"
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
 
    return a.exec();
}

#include <QtGui/QApplication>
#include "mainwindow.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    
    return a.exec();
}

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mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
 
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
}
 
MainWindow::~MainWindow()
{
    delete ui;
}
 
void MainWindow::on_pushButton_clicked()
{
    MainWindow w;
    ui->pushButton->setText("Ferma riconoscimento");
    w.cattura();
}
 
 
void MainWindow::cattura()
{
        cameraTimer.start(33); // 33 ms = 30 fps
        connect(&cameraTimer, SIGNAL(timeout()),this,SLOT(cameraTimerTimeout()));
 
       return;
 
}
 
void MainWindow::cameraTimerTimeout()
{
    std::cout << "CIAO2" << std::endl;
 
}

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

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

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

void MainWindow::on_pushButton_clicked()
{
    MainWindow w;
    ui->pushButton->setText("Ferma riconoscimento");
    w.cattura();
}


void MainWindow::cattura()
{
        cameraTimer.start(33); // 33 ms = 30 fps
        connect(&cameraTimer, SIGNAL(timeout()),this,SLOT(cameraTimerTimeout()));
       
       return;

}

void MainWindow::cameraTimerTimeout()
{
    std::cout << "CIAO2" << std::endl;

}

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Thank you in advance!