I want so save a QTreeWidget into a XML-File.(And open it later)I found 2 functions where i can save strings, but i can´t save values from widgets. So how i can save the values for exammple of a QTextEdit?
Qt Code: 
  1. void ImageModul::writeIndexEntry(QXmlStreamWriter *xmlWriter, QTreeWidgetItem *item)
  2. {
  3.     xmlWriter->writeStartElement("attribute");
  4.     xmlWriter->writeAttribute("", item->text(0));
  5.     QString valueString = item->text(1);
  6.     if (!valueString.isEmpty()) {
  7.         QStringList values = valueString.split(", ");
  8.         foreach (QString value, values)
  9.             xmlWriter->writeTextElement("value", value);
  10.     }
  11.     for (int i = 0; i < item->childCount(); ++i)
  12.         writeIndexEntry(xmlWriter, item->child(i));
  13.     xmlWriter->writeEndElement();
  14. }
  15. bool ImageModul::writeXml(const QString &fileName, QTreeWidget *treeWidget)
  16. {
  17.     QFile file(fileName);
  18.     if (!file.open(QFile::WriteOnly | QFile::Text)) {
  19.         qDebug() << "Error: Cannot write file ";
  20.         return false;
  21.     }
  22.  
  23.     QXmlStreamWriter xmlWriter(&file);
  24.     xmlWriter.setAutoFormatting(true);
  25.     xmlWriter.writeStartDocument();
  26.     xmlWriter.writeStartElement("cell");
  27.     for (int i = 0; i < treeWidget->topLevelItemCount(); ++i)
  28.         writeIndexEntry(&xmlWriter, treeWidget->topLevelItem(i));
  29.     xmlWriter.writeEndDocument();
  30.     file.close();
  31.     if (file.error()) {
  32.         qDebug() << "Error: Cannot write file ";
  33.         return false;
  34.     }
  35.     return true;
  36. }
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(saving path,duration,visibily,strech Images - Values into a XML *.txt file)

I need it to save several TreeWidgets(which are in a 2d vector) into a file.