Hello!

I've got my simple application, but it causes memory leak. I think one of this three functions is a problem:

Qt Code: 
  1. bool MainWindow::pobierzKomunikaty()
  2. {
  3.     bool ok;
  4.     QTextStream out(stdout);
  5.     QString zapytanie;
  7.     QSqlQueryModel queryModel;
  8.  
  9.     QFont font;
  10.     font.setPointSize(7);
  11.  
  12.     odczytanoOstatnieKomunikaty=0;
  13.  
  14.     ok = bdb.open();
  15.  
  16.     if (ok)
  17.     {
  18.         out << endl << "Otworzylem baze!" << endl ;
  19.     } else {
  20.         out << "Nie udalo sie otworzyc bazy!" << endl;
  21.     }
  22.  
  23.     queryModel.setQuery("SELECT * FROM server_notifications WHERE complete='0'", bdb); //LIMIT 1
  24.  
  25.     liczbaWiadomosci = queryModel.rowCount();
  26.  
  27.     bdb.close();
  28.  
  29.     out << "Mamy: " << liczbaWiadomosci << " wiadomosci!" << endl;
  30.  
  31.  
  32.     for(int i=0 ; i<liczbaWiadomosci; i++)
  33.     {
  34.         rec = queryModel.record(i);
  35.  
  36.  
  37.         out << rec.value(1).toString() << ": ";
  38.         out << rec.value(2).toString() << endl;
  39.  
  40.         QMessageBox *msgBox=new QMessageBox;
  41.  
  42.         if(rec.value(1).toString()=="warning") msgBox->setIcon(QMessageBox::Warning);
  43.         else if (rec.value(1).toString()=="info") msgBox->setIcon(QMessageBox::Information);
  44.         else if (rec.value(1).toString()=="error") msgBox->setIcon(QMessageBox::Critical);
  45.  
  46.         msgBox->setFont(font);
  47.  
  48.         msgBox->setWindowTitle(rec.value(1).toString());
  49.         msgBox->setText(rec.value(2).toString());
  50.  
  51.         QSpacerItem* horizontalSpacer = new QSpacerItem(240, 290, QSizePolicy::Minimum, QSizePolicy::Minimum);
  52.         QGridLayout* layout = (QGridLayout*)msgBox->layout();
  53.         layout->addItem(horizontalSpacer, layout->rowCount(), 0, 1, layout->columnCount());
  54.  
  55.         msgBox->move(0,0);
  56.         msgBox->exec();
  57.  
  58.         delete msgBox;
  59.  
  60.         ok = bdb.open();
  61.  
  62.         zapytanie.clear();
  63.         zapytanie="update server_notifications set complete='1'";
  64.         zapytanie.append(" where id='");
  65.         zapytanie.append(QString::number(rec.value(0).toInt()));
  66.         zapytanie.append("'");
  67.  
  68.         QSqlQuery *query=new QSqlQuery;
  69.  
  70.         query->clear();
  71.         query->prepare(zapytanie);
  72.         ok = query->exec();
  73.  
  74.         bdb.close();
  75.  
  76.         delete query;
  77.     }
  78.  
  79.     odczytanoOstatnieKomunikaty=1;
  80.  
  81.     return ok;
  82. }
  83.  
  84. bool MainWindow::wyswietlKomunikaty()
  85. {
  86.     if(odczytanoOstatnieKomunikaty==0)
  87.     {
  88.  
  89.     } else
  90.     {
  91.         pobierzKomunikaty();
  92.         odczytajNotificationInterval();
  93.         timer->start(notificationInterval);
  94.     }
  95.  
  96.     return 1;
  97. }
  98.  
  99. bool MainWindow::odczytajNotificationInterval()
  100. {
  101.     bool ok;
  102.     QTextStream out(stdout);
  104.     QSqlQueryModel queryModel;
  105.  
  106.     ok = bdb.open();
  107.  
  108.     if (ok)
  109.     {
  110.         out << endl << "Otworzylem baze!" << endl ;
  111.     } else {
  112.         out << "Nie udalo sie otworzyc bazy!" << endl;
  113.     }
  114.  
  115.     queryModel.setQuery("SELECT * FROM config WHERE name='qt-notification-interval'", bdb);
  116.  
  117.     rec = queryModel.record(0);
  118.     notificationInterval = (rec.value(1).toInt())*1000;
  119.  
  120.     out << "Notification interval: " << notificationInterval << " ms" << endl;
  121.  
  122.     bdb.close();
  123.  
  124.     return ok;
  125. }
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Maybe someone can tell me where?

thanks in advance
best regards
Tomasz