Modify an XML file QXMLStreamReader/Writer

Question

I am working on something where I am using QXMLStreamReader and QXMLStreamWriter, to read and write to a file.

But am not able to find a wa

Answer 1

You can use QDomDocument to store content from XML. You can create new child, tag, attribute.

#include 
#include 
#include 
#include 
#include 
#include 
#include 

int main()
{
    QFile file("test.xml");
    if (!file.open(QIODevice::ReadOnly | QIODevice::Text))
    {
        qDebug() << "Failed to open file";
        return 0;
    }
    QDomDocument document;
    if (!document.setContent(&file))
    {
        qDebug() << "failed to parse file";
        file.close();
        return 0;
    }

    file.close();

    QDomElement docEle = document.documentElement();
    QDomNodeList elements = docEle.elementsByTagName("LAMPS");

    QDomElement light1 = document.createElement( "LIGHT1" );
    QDomElement state = document.createElement("State");
    QDomText nextNode = document.createTextNode("State");
    state.appendChild(nextNode);
    light1.appendChild(state);
    docEle.appendChild( light1 );

    QFile outFile( "test-result.xml" );
    if( !outFile.open( QIODevice::WriteOnly | QIODevice::Text ) )
    {
        qDebug( "Failed to open file for writing." );
        return 0;
    }

    QTextStream stream( &outFile );
    stream << document.toString();

    outFile.close();
    return 0;
}