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[SOLVED] QDomNode is always null

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I wrote some method which returns QDomNode : private: QDomNode createNode(QStandardItem * item) {       if (item == NULL)      return QDomNode();           QDomNode node;     node.toElement().setTagName(item->text());       // write attributes     QStandardItem * parent = item->parent();       if (parent == NULL)      parent = invisibleRootItem();       for (int i = 1; i < columnCount(); i++) {        QStandardItem * columnItem = parent->child(item->row(), i);        if (columnItem == NULL)       continue;        QString sValue = columnItem->text();        if (sValue.isEmpty())       continue;        node.toElement().setAttribute(headerData(i,Qt::Horizontal,Qt::DisplayRole).toString(), sValue);         }       int childCount = item->rowCount();       for (int i = 0; i < childCount; i++) {        QDomNode childNode = createNode(item->child(i));        if (childNode.isNull())       continue;        node.appendChild(childNode);     }         return node;    } But it always returns a null node, no matter of arguments. What am I doing wrong ?

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