QT DOMXml - Change the name of a node [duplicate] - c++

Question

This question already has answers here:
Edit Value of a QDomElement?
(6 answers)
Closed 6 years ago.
I am working on a QT Project and part of that is a reconstruction of an XML file. I was able to make most of the needed changes with QDom but I can't find how to rename a node.
So the old XML file looks like ..
<root>
<window name="" ..>
<element x="" y=""/>
<element1 a="" b=""/>
...
</window>
..
..
<window name="">
<element x="" y=""/>
<element1 a="" b=""/>
...
</window>
</root>
How can i change the XML so that the new one will have < group > instead of < window >?
So at the end it needs to look like..
<root>
<group name="" ..>
<element x="" y=""/>
<element1 a="" b=""/>
...
</group>
..
..
<group name="">
<element x="" y=""/>
<element1 a="" b=""/>
...
</group>
</root>
Adding some more info...
Here is the code I use to read the <window> nodes, delete some based on the visibility (comes from a list) and I need to change <window> to <group> for the remaining nodes.
QFile oldXml("file.xml");
oldXml.open(QIODevice::ReadOnly);
QDomDocument doc;
doc.setContent(&oldXml);
QDomNodeList nodes = doc.elementsByTagName("window");
// Remove Window nodes based on visibility
insize = nodes.length();
for ( int i = 0; i < insize; i++ ) {
QDomNode node = nodes.at(i-dels);
if ( (list2[i] == "0") | (list2[i]=="") ) {
node.parentNode().removeChild(node);
dels=dels+1;
} else {
// Here is where i need to change the node name from <window> to e.g. <group>
}
}

Answer 1

You could use setTagName and maybe setAttribute if you want to set a value for the name attribute.
With the following example, myxml.xml is converted to xmlout.xml
Note#1: this is just an example: we're replacing only the first node.
Note#2: in this example, we're using two different files. Depending on your design, you could use the same or not.
myxml.xml
<root>
<window name="">
<element x="" y=""/>
<element1 a="" b=""/>
</window>
<window name="">
<element x="" y=""/>
<element1 a="" b=""/>
</window>
</root>
xmlout.xml
<root>
<group name="value">
<element y="" x=""/>
<element1 a="" b=""/>
</group>
<window name="">
<element y="" x=""/>
<element1 a="" b=""/>
</window>
</root>
main.cpp
#include <iostream>
#include <QtXml>
#include <QFile>
int main(int argc, char *argv[])
{
QDomDocument doc;
// Load xml file as raw data
QFile inFile(":myxml.xml");
if (!inFile.open(QIODevice::ReadOnly ))
{
std::cerr << "Error - inFile: " << inFile.errorString().toStdString();
return 1;
}
// Set data into the QDomDocument before processing
doc.setContent(&inFile);
// Get element in question
QDomElement root = doc.documentElement();
QDomElement nodeTag = root.firstChildElement("window");
nodeTag.setTagName("group");
nodeTag.setAttribute("name","value");
inFile.close();
// Save the modified data
QFile outFile("xmlout.xml");
if (!outFile.open(QIODevice::WriteOnly ))
{
// Error while loading file
std::cerr << "Error - outFile: " << outFile.errorString().toStdString();
return 1;
}
QTextStream stream;
stream.setDevice(&outFile);
stream.setCodec("UTF-8");
doc.save(stream,4);
outFile.close();
return 0;
}

Answer 2

I did not see any straight API function to rename the element. API is allowing to change value but not name.
There is another round about way.
Create an element, for example:
QDomElement group = doc.createElement("group");
use "QDomNode's replacechild" function.
QDomNode QDomNode::replaceChild(const QDomNode &newChild, const QDomNode &oldChild)
ex:
QDomNode dNode = node.replaceChild(group,oldNode);