// filling combobox
    QDirIterator path("/home/max/Qt/Converter-build-desktop/img");
    QMap <QString, QPixmap> map;
    QMap <QString, QPixmap>::iterator it;

    while(path.hasNext()) // get names of files and make the map
    {
        QFileInfo pathInfo( path.next() );
        map[pathInfo.fileName()] = QPixmap(path.next());
    }

    for(QMap<QString, QPixmap>::iterator it = map.begin(); it != map.end(); ++it)
    {
        fromCombo->addItem(it.key());
    }