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Thread: writing raw data into xml sub-node

  1. #1
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    Default writing raw data into xml sub-node

    (continuing http://www.qtcentre.org/threads/6000...-and-sub-nodes )

    I am using QXmlStreamWriter, and under some conditions I need to write into a node, a text that contains raw xml, not encoded.

    Qt Code:
    1. QString b = "<b>test 1 2 3 </b>";
    2. QXmlStreamWriter stream(&output);
    3. stream.writeStartDocument();
    4. stream.writeStartElement("a");
    5. stream.writeCharacters(b);
    6. stream.writeEndElement();
    7. stream.writeEndDocument();
    8. stream.close();
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    In this example, "b" gets encoded into XML, which is usually desired, but not in this case.

    One solution I have is to write the XML manually as a text file. This will work, but I feel this is ugly.

    What other alternatives to I have?

  2. #2
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    Default Re: writing raw data into xml sub-node

    Have you tried writing into "output" after calling writeStartElement("a")?

    Cheers,
    _

  3. #3
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    Default Re: writing raw data into xml sub-node

    Is this what you recommend?

    Qt Code:
    1. void test_save() {
    2. QString b = "<b>test 1 2 3 </b>";
    3. QByteArray bytes;
    4. QBuffer output(&bytes);
    5. output.open(QIODevice::ReadWrite);
    6.  
    7. QXmlStreamWriter stream(&output);
    8. stream.writeStartDocument();
    9. stream.writeStartElement("a");
    10. output.write(b.toLatin1().constData(), b.length());
    11. stream.writeEndElement();
    12. stream.writeEndDocument();
    13. output.close();
    14. qDebug("%s", bytes.data());
    15. }
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    This outputs:
    Qt Code:
    1. <?xml version="1.0" encoding="UTF-8"?><a<b>test 1 2 3 </b>/>
    To copy to clipboard, switch view to plain text mode 

    See how "a" element is not closed? Note also how the "</a>" is missing, as well as document end. I wonder why it broke off so much.

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    Default Re: writing raw data into xml sub-node

    Your biological and technological distinctiveness will be added to our own. Resistance is futile.

    Please ask Qt related questions on the forum and not using private messages or visitor messages.


  5. #5
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    Default Re: writing raw data into xml sub-node

    See how "a" element is not closed? Note also how the "</a>" is missing, as well as document end. I wonder why it broke off so much.
    Because you told QXmlStreamWriter to write an empty "<a/>" element. By calling output.write() directly, you did something that the stream writer has no knowledge about. It doesn't know what you did "behind its back". As far as it knows, all you did was to tell it to start an "a" element, then immediately end it.

    Try wysota's idea.

    But why can't you simply write out the raw XML using QXmlStreamWriter? Are the "<b>" element names unknown at compile time? Or is it only the text inside the "b" element?

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