QString XML_reader::get_image_path() {
    QDomElement element = document.documentElement();
    QDomNode node = element.firstChildElement();
    QString image_path;
    while (!node.isNull()) {
        if (node.isElement()) {
            QDomNode n = node.toElement().firstChildElement();
            while (!n.isNull()) {
                if (n.isElement()) {
                    QDomElement el = n.toElement();
                    if (el.tagName() == "photo") {
                        QDomNode nd = n.toElement().firstChildElement();
                        while(!nd.isNull()) {
                            QDomElement elm = nd.toElement();
                            if (elm.tagName() == "image-path") {
                                image_path = el.text();
                                break;
                            }
                        }
                        nd = nd.nextSibling();
                    }
                }
                n = n.nextSibling();
            }
        }
        node = node.nextSibling();
    }
    return image_path;
}