Hi,
Im using QDomDocument for xml file.

My xml file has the following data,
Qt Code: 
  1. <?xml version="1.0"?>
  2. <config>
  3. <dbus>
  4.        <gas_value>2</gas_value>
  5.  </dbus>
  6. </config>
To copy to clipboard, switch view to plain text mode 

I want to replace <gas_value>2</gas_value> with <gas_value>100</gas_value>

Im using following code to replace it
Qt Code: 
  1. QFile *file = new QFile("dbus_write.xml");
  2.  
  3.     if (!file->open(QIODevice::ReadWrite | QIODevice::Text))
  4.     {
  5.         qDebug() << "unable to open xml file";
  6.         return;
  7.     }
  8.  
  9.     QDomDocument doc("dbus_write");
  10.     doc.setContent(file);
  11.  
  12.     QDomElement root = doc.firstChildElement("config");
  13.     QDomElement parent = root.firstChildElement("dbus");
  14.     QDomElement gasvalue = parent.firstChildElement("gas_value");
  15.     parent.firstChildElement("gas_value").firstChild().setNodeValue("100");
  16.     QTextStream stream(file);
  17.     gasvalue.save(stream, 4);
  18.     file->close();
To copy to clipboard, switch view to plain text mode 

but this code doesn't replaces the tag <gas_value>2</gas_value> , instead it creates another tag <gas_value>100</gas_value>
and produces following xml file
Qt Code: 
  1. <?xml version="1.0"?>
  2. <config>
  3. <dbus>
  4.        <gas_value>2</gas_value>
  5.  </dbus>
  6. </config>
  7.  
  8.       <gas_value>100</gas_value>
To copy to clipboard, switch view to plain text mode 

I tried using replaceChild() method, but results in same output.

Any thoughts?
thanks.