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Thread: [SAX] program loop while reading XML file

  1. #1
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    Default [SAX] program loop while reading XML file

    hi,

    I'm trying to parse XML file with SAX, but my program started looping. Here is my function:
    Qt Code:
    1. void JTemplate::readStyles(QXmlStreamReader &xml, QString parentId, QString id, JList<JCss> &css)
    2. {
    3. if (xml.name() == parentId)
    4. {
    5. qDebug()<<"Parsuje: "<<parentId;
    6.  
    7. while (!(xml.name() == parentId && xml.tokenType() == QXmlStreamReader::EndElement))
    8. {
    9. xml.readNext();
    10.  
    11. JCss _result;
    12. _result.setName(xml.attributes().value("name").toString());
    13. qDebug()<<"Nazwa stylu Css to: "<<_result.getName();
    14. xml.readNext();
    15.  
    16. while (!(xml.name() == id && xml.tokenType() == QXmlStreamReader::EndElement))
    17. {
    18. qDebug()<<"Styl: " << xml.name().toString();
    19. _result.setStyle(toCssStyle(xml.name().toString()), xml.readElementText());
    20. }
    21.  
    22. css.add(_result);
    23.  
    24. xml.readNext();
    25. continue;
    26. }
    27. }
    28. }
    To copy to clipboard, switch view to plain text mode 

    This function was written to parese parts of XML file like:
    Qt Code:
    1. <visited>
    2. <link name="bink1_visited">
    3. <FontColor>red</FontColor>
    4. <FontColor2>green</FontColor2>
    5. </link>
    6. </visited>
    To copy to clipboard, switch view to plain text mode 
    When I use this function for example
    Qt Code:
    1. readStyles(_xml, "visited", "link", CssAnchorVisited);
    To copy to clipboard, switch view to plain text mode 
    the loop
    Qt Code:
    1. while (!(xml.name() == id && xml.tokenType() == QXmlStreamReader::EndElement))
    To copy to clipboard, switch view to plain text mode 
    is working indefinitely. Why? What do I do wrong?

    And the second thing, I cannot read arguments (in my code "name") in line:
    Qt Code:
    1. _result.setName(xml.attributes().value("name").toString());
    To copy to clipboard, switch view to plain text mode 

    ps. Sory for my English :-) I'm still learning

  2. #2
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    Default Re: [SAX] program loop while reading XML file

    As for the while statement, you have two readNext in the loop - perhaps you skip the end tag that you are looking for.

  3. #3
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    Default Re: [SAX] program loop while reading XML file

    Quote Originally Posted by kabanek View Post
    the loop
    Qt Code:
    1. while (!(xml.name() == id && xml.tokenType() == QXmlStreamReader::EndElement))
    To copy to clipboard, switch view to plain text mode 
    is working indefinitely. Why? What do I do wrong?
    What is this while() loop supposed to do?

    And the second thing, I cannot read arguments (in my code "name") in line:
    Qt Code:
    1. _result.setName(xml.attributes().value("name").toString());
    To copy to clipboard, switch view to plain text mode 
    Attributes are reported in StartElement and not EndElement.

    I'm not sure what you want to achieve but I think you are overcomplicating things, try this:
    Qt Code:
    1. JList<JCss> JTemplate::readStyles(QXmlStreamReader &xml, QString parentId, QString id )
    2. {
    3. JList<JCss> css;
    4. Q_ASSERT(xml.name() == parentId);
    5. while(xml.readNextStartElement() {
    6. if(xml.name() == parentId) {
    7. while(xml.readNextStartElement()){
    8. if(xml.name() == id){
    9. JCss _result;
    10. _result.setName(xml.attributes().value("name").toString());
    11. qDebug() << "Styl:" << xml.name();
    12. _result.setStyle(...); // I don't think readElementText() will work here without using a CDATA section
    13. css.add(_result);
    14. } else xml.skipCurrentElement(); // skip unknown tags
    15. }
    16. xml.skipCurrentElement(); // read until end of parentId tag
    17. } else xml.skipCurrentElement(); // skip unknown tags
    18. }
    19. return css;
    20. }
    To copy to clipboard, switch view to plain text mode 
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