@void MainWindow::on_pushButton_2_clicked()
{
QString fileName = QFileDialog::getSaveFileName(this, tr("Zapisz plik"), "",
tr("Plik tekstowy (.txt);;Plik C++ (.cpp *.h)"));

 if (fileName != "") {
     QFile file(fileName);
     if (!file.open(QFile::WriteOnly | QFile::Text)) {
         // error
     } else {
         QTextStream stream(&file);
         stream.setIntegerBase(10);
         stream << "Czas: " << timeEdit->time().toString() << "\n\n";
         stream << "Data: " << dateEdit->date().toString() << "\n\n";
         stream << "Miejsce: " << lineEdit->text() << "\n\n";
         stream << "Temat: " << lineEdit_2->text() << "\n\n";
         //stream << "Wiadomosc: " << textEdit-> << "\n\n";
         stream.flush();
         file.close();
     }
 }

}@

Content of .txt file:

Czas:

Data: 0x4

Miejsce: 0x22fe48

Temat: 0x40bab2

Wiadomosc: 0x0

What is wrong ?
Greetings !