I have this code like this:

Qt Code: 
  1. bool XmlSpoListParser::read()
  2. {
  3.     while (!atEnd()) {
  4.         readNext();
  5.  
  6.         if (isStartElement()) {
  7.             if (name() == QLatin1String("Tag") && attributes().value(QLatin1String("version")) == QLatin1String("1.0")) {
  8.                 readSomething1();
  9.                 break;
  10.             } else {
  11.                 raiseError(QObject::tr("The file is not an Tag version 1.0 file."));
  12.                 break;
  13.             }
  14.         }
  15.         if (hasError() && onError()) {
  16.             break;
  17.         }
  18.     }
  19.  
  20.      return !error();
  21. }
  22.  
  23. bool XmlSpoListParser::onError()
  24. {
  25.     if (error() == QXmlStreamReader::PrematureEndOfDocumentError) {
  26.         appendMoreData();
  27.         return false;
  28.     } else {
  29.         qDebug() << errorString();
  30.         return true;
  31.     }
  32. }
  33.  
  34. void XmlSpoListParser::appendMoreData()
  35. {
  36. //???
  37. }
  38.  
  39. void XmlSpoListParser::readSomething1()
  40. {
  41.     while (!(isEndElement() && name() == QLatin1String("Tag2")) && !atEnd()) {
  42.         readNext();
  43.         if (isStartElement()) {
  44.             if (name() == QLatin1String("Tag3")) {
  45.                 readSomething2();
  46.             } else {
  47.                 skipSubTree();
  48.             }
  49.         }
  50.         if (hasError() && onError()) {
  51.             break;
  52.         }
  53.     }
  54. }
  55.  
  56. void XmlSpoListParser::readSomething2()
  57. {
  58.     while (!(isEndElement() && name() == QLatin1String("Tag3")) && !atEnd()) {
  59.         readNext();
  60.         if (isStartElement()) {
  61.             if (name() == QLatin1String("Tag4")) {
  62.                 readSomething3();
  63.             } else {
  64.                 skipSubTree();
  65.             }
  66.         }
  67.         if (hasError() && onError()) {
  68.             break;
  69.         }
  70.     }
  71. }
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How i can wait data from socket when error PrematureEndOfDocumentError occured from readSomething2() method (for example)? I wan't call addData() to parser and return back to method readSomething1() after new data arrived. What i must do, create additional QEventLoop in method appendMoreData, or use infinite while(1) with QApplication::processEvents() or what?