try this code
Qt Code: 
  1. ...
  3. doc.appendChild(doc.createProcessingInstruction("xml", "version=\"1.0\" encoding=\"UTF-8\""));
  4. QDomElement root = doc.createElement("communication");
  5. root.setAttribute("OS", 3);
  6. root.setAttribute("CMD", "03");
  7. root.setAttribute("VER", 1.0);	
  8. QDomElement parameters = doc.createElement("parameters");	
  9. QDomElement parameter = doc.createElement("parameter");
  10. parameter.setAttribute("MODNAME", "iCMDataCard");
  11. parameter.setAttribute("MODVERS", "1.0.1.2");
  12. parameters.appendChild(parameter);
  13. root.appendChild(parameters);
  14. doc.appendChild(root);
  15.  
  16. QFile file("settings.xml");
  17. if (file.open(QIODevice::WriteOnly)) {
  18. 	QTextStream out(&file);
  19. 	out << doc.toString();
  20. }
  21. ...
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