How to create a new XML file when edited in the UI?

kishore_hemmady

I have a UI which parses a value from an XML file and this value appears in the QLineEdit.When user changes the lineEdit value this should be written in the new XML file.How do I do that?I'm parsing some 20 values from XML and displaying all 20 values in the UI lineEdits.

sierdzio

Use either QXmlStreamReader + QXmlStreamWriter or QDom.

kishore_hemmady

@sierdzio
Hi
I'm using QDom for reading.but how can i copy the complete original xml file except the edited value to the new file and the edited value should be updated in the new xml file.

sierdzio

QDom holds the whole XML structure in memory. All that you need to do is to save it back to your file. Something like:

QDomDocument dom; // Your doc
QFile xmlFile("path/to/your/file.xml");
if (xmlFile.open(QFile::WriteOnly | QFile::Text)) {
  xmlFile.write(dom.toString(4)); // Or toByteArray()
}

kishore_hemmady

@sierdzio
Hi,
I'm getting this error on using your snippet

/home/kishor/mainwindow.cpp:346: error: no matching function for call to ‘QFile::write(QString)’
xmlFile.write(document.toString(4)); // Or toByteArray()

What is that 4 doing there?
^

sierdzio

Read the docs I've linked. 4 creates the file with 4 space indent. https://doc.qt.io/qt-5/qdomdocument.html#toString

If that does not work, use the toByteArray(), like I've (also) said already.