I have the next doubt, I have an exit button created on the graphic interface, and I want to attach the closeEvent to him I have the next code but I couldnt make it work.

Qt Code: 
  1. MainWindow::MainWindow(QWidget *parent) :
  2.  
  3.     QMainWindow(parent),
  4.     ui(new Ui::MainWindow)
  5. {
  6.     ui->setupUi(this);
  7.  
  8.  
  9. }
  10. void MainWindow::on_exit_clicked()
  11. {
  12.     closeEvent( );
  13. }
  14.  
  15. void MainWindow::closeEvent(QCloseEvent *event)    {
  16.     QMessageBox::StandardButton resBtn = QMessageBox::question( this, "Images",
  17.                                                                  tr("Are you sure to exit?\n"),
  18.                                                                  QMessageBox::Cancel | QMessageBox::No | QMessageBox::Yes,
  19.                                                                  QMessageBox::Yes);
  20.      if (resBtn != QMessageBox::Yes) {
  21.          event->ignore();
  22.      } else {
  23.          event->accept();
  24.      }
  25. }
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