#include <QApplication>
#include <QTimer>
#include <QFileDialog>
#include <QLineEdit>
#include <QWidget>
#include <QMessageBox>

int main(int argc, char *argv[])
{
    QApplication app2(argc, argv);
    QTimer timer;
    
    QWidget * lineEdit = new QLineEdit;
    QDialog * dialog = new QFileDialog(lineEdit);
    
    QObject::connect(&timer, &QTimer::timeout, [=]() {
        dialog->done(QMessageBox::Cancel);
	// dialog->close();
    });
    
    timer.setSingleShot(true);
    timer.start(1000);
    
    lineEdit->show();
    dialog->exec();
    
    int result = app2.exec();
    return result;
}