A colleague asked for me on the mailing list and that was the answer:

regarding the 'deprecated' state of XmlPatterns: There wont be an further development for this module, but I also doubt that it will be removed before Qt 6. So as long as you're using Qt 5 you're safe to use XmlPatterns. Qt 6 might be still 2 years away, and as you're using it professionally, I assume that you'll probably wait at least till the release of Qt 6.1 (or even longer) anyway before upgrading your project to it. Until then there might be another Qt (conforming) solution to the problem.

So in my opinion you've got 2 options (depending on the scope and lifecycle of your project):
a) use the Xml Schema related classes from the XmlPatterns module and worry about it going away (much) later, and maybe even have a Qt (conforming) solution by then, or
b) use an external library like CodeSynthesis XSD or something similar and worry about their API changes and usage and naming patterns that differ from Qt's patterns etc.

IMHO using the Qt modules while they are still available is usually the better option.

[[by Yves Maurischat]]

I hope that helps other developers with similar questions. I mark this as solved in the sense that there is some sort of answer here, although maybe it's not completely satisfying.

Oh man, we have a serializer that produces <key> for every tag. I was wondering why on earth anyone would design a format that way. Now I understand why, it was produced by some kind of serializer. Thank you for providing some sanity to this mess we call xml. I like xml in concept, but some of the tools out there make me wonder about my sanity at times.

@HW-Developer Start here http://doc.qt.io/qt-5/qtxml-index.html

Hi,

QDomDocument comes to mind for that kind of thing. There's no easy way to modify a file "in-place".

@TheTrueGoofy said in Read and write QBrush (QPen, QFont) as XML:

Certainly this is also quite simple to implement, but I was hoping that there is a more elegant solution.

I think the only other way is to create feature request for QtGui, or implement a Qt patch yourself - to add a QBrush::toString() method (or QTextStream overload), with a corresponding QBrush::fromString().

@koahnig Thanx mate

Again, it wasn't a suggestion, I was just asking whether you would simply do tag for tag replacement.

Out of curiosity, since you are using doxygen, why not make it generate the html directly ?

Hi,
Creating a very "abstract" xml parser is not easy and it's quite error-prone. You have to know some (or at least one) parent or common tag names in order to have a starting point for any deeper "abstract" parsing. Basically, you have to move the parser step by step checking everything in the way. For example, you could use a simple function as an entry point for the following function when you meet a specific tag:

void XmlReader::readFragment() { Q_ASSERT(m_reader->isStartElement()); //Make sure the xmlreader is at an opening tag const QString p = m_reader->qualifiedName().toString(); // From now on, you will work with this opening tag //Do what you want, for example handle attributes and their values for (auto i = 0; i < m_reader->attributes().count(); ++i) { ... } m_reader->readNext(); //Move on ... //Do everything manually like this if (m_reader->isCharacters) { ... } else if (m_reader->isEndElement()) { ... } //or like this //Eventually, you have to check for the closing current tag, exit the function, //and return the control to the "entry point" function while (!m_reader->isEndElement() && !m_reader->qualifiedName().toString() == p) { ... //Do your work m_reader->readNext(); } }

However, with this approach, things can get extremely complicated if there are nested tags, for example:

<p> <note> <p>...</p> </note> </p>

Maybe it would be easier to subclass QXmlStreamReader but it would help to provide some sample xml data and more info on what exactly you want to do.

@Pradeep-Kumar Do you have your code please? Sounds like you're adding nodes at the root level. You need to insert a sibling after the first/second node.

Thanks @yuvaram @jsulm @yuvaram . he XML which i have posted here is not in proper format . Since the XML is very big i wanted to post a small snippet of it . Thanks for your help .

@Mathan-M Instead of QDom* you can use the QXmlStreamReader as the document says it is quite faster and memory efficient.
Once you get to the parent node you can just use name and readElementText iteratively.

Hi @SGaist ,

Yes, I am maintaining the version in the xml file to compare the latest version maps are available.

Thanks for the reply.

@the_ said:

I for myself do not like this format...

No-one does ^_^

@Paul-Colby i am opening xml file as you mentioned
first time when i pressed save button it will show
<?xml version='1.0'?>
<xml>
<tag1> </tag1> // two spaces from line edit
</xml>

second time when i presses save button it will show

<?xml version='1.0'?>
<xml>
<tag1/> // some data in lineedit
</xml>

third time when i presses save button it will show

<?xml version='1.0'?>
<xml>
<tag1/> // some data in lineedit
</xml>

i am using Qt 4.8.7, i am opening xml file , see the result

@Wilk it's cool! What about JSON serialization?

I will try to use your library in my project http://forum.qt.io/topic/64999/qt-micro-rest-client-framework-beta

@mrjj I don't know but never thought about it so that's why I did that "odd/botched job" and when you mentioned it was like a "Oh man! why didn't I thought in that before? Its so simple...." hahaha I'll keep it in mind henceforth.

Hi and welcome to devnet,

Your path to test.xml is relative so the file should be beside your executable. Currently your executable is located in a shadow build dir. So for your test you can use an absolute path or copy the file in the shadow build dir.

Hi,

thank you very much, it was a really nice help. (Additionally, my XML file wasn't well formatted, but it's fixed).
But there is one thing that I didn't see, how can I relaize: how can I insert a node into an existing XML file?

Regards,
Norbert

Sorry, I misunderstood your problem. You don't need to keep all the data in-memory, you can read the file update the xml and write it again.

On the other hand, you could also use a simple sqlite database to store your values and generate the xml only when needed.

@JohanSolo
Thank you . I used index to read an array.

@NetZwerg
I have set the values previously.

if(var == "TR") { filter_values[row][column] = 0; }

Obrigado pela resposta! vou testar hoje o que vc mandou e depois posto aqui se funcionou...