bool confirm(QString s)
{
       QMessageBox* pmbx =  new QMessageBox("Warning",  s, QMessageBox::Warning,  QMessageBox::Yes, QMessageBox::NoButton, QMessageBox::No | QMessageBox::Escape);

       int pressed = pmbx->exec();

       if (pressed == QMessageBox::Yes)
       {
              delete pmbx;
              return true;
       }

       delete pmbx;

       return false;
}