Format XML file in c++ or Qt

I have an XML file where outputs are not getting formatted. That means all the outputs are in a single line but I want to break it tag by tag.

For e.g. -

<?xml version="1.0" encoding="UTF-8" standalone="no" ?><Analyser>   <JointDetails>              <Details><StdThickness> T </StdThickness><Thickness_num> 0.032 </Thickness_num></Details>   </JointDetails></Analyser>

But i want to do it like this ::

<?xml version="1.0" encoding="UTF-8" standalone="no" ?>
<Analyser>  
 <JointDetails>
   <Details>
<StdThickness> T </StdThickness>
<Thickness_num> 0.032 </Thickness_num>
</Details> 
  </JointDetails>
</Analyser>

Please don't suggest to do it while writing the XML file because this XML file is already there but now I have to format it as mentioned above.

void format(void)
{
    QDomDocument input;

    QFile inFile("D:/input.xml");
    QFile outFile("D:/output.xml");

    inFile.open(inFile.Text | inFile.ReadOnly);
    outFile.open(outFile.Text | outFile.WriteOnly);

    input.setContent(&inFile);

    QDomDocument output(input);
    QTextStream stream(&outFile);
    output.save(stream, 2);
}