Writing and reading XML files with Qt - qxmlstreamwriter and qxmlstreamreader provided classes

qtxml.cpp

//Writing and reading XML files with Qt - qxmlstreamwriter and qxmlstreamreader supported classes

void MyXMLClass::SaveXMLFile()
{

	QString filename = QFileDialog::getSaveFileName(this,
		                               tr("Save Xml"), ".",
		                               tr("Xml files (*.xml)"));


	QFile file(filename);
	file.open(QIODevice::WriteOnly);

	QXmlStreamWriter xmlWriter(&file);
	xmlWriter.setAutoFormatting(true);
	xmlWriter.writeStartDocument();

	xmlWriter.writeStartElement("LAMPS");

	xmlWriter.writeStartElement("LIGHT1");
	xmlWriter.writeTextElement("State", "statevalue" );
	xmlWriter.writeTextElement("Room", "roomvalue");
	xmlWriter.writeTextElement("Potencial", "potencialvalue");

	xmlWriter.writeEndElement();

        file.close();
}



void MyXMLClass::ReadXMLFile()
{
        QXmlStreamReader Rxml;

        QString filename = QFileDialog::getOpenFileName(this,
	                               tr("Open Xml"), ".",
	                               tr("Xml files (*.xml)"));

	QFile file(filename);
		if (!file.open(QFile::ReadOnly | QFile::Text))
	{
	    std::cerr << "Error: Cannot read file " << qPrintable(filename)
	              << ": " << qPrintable(file.errorString())
	              << std::endl;

	}

	Rxml.setDevice(&file);
	Rxml.readNext();

	while(!Rxml.atEnd())
	{
		if(Rxml.isStartElement())
		{
			if(Rxml.name() == "LAMPS")
			{
				READNEXT();
			}
			else if(Rxml.name() == "LIGHT1")
			{
				while(!Rxml.atEnd())
	                        {
		                     if(Rxml.isEndElement())
		                     {
			                 READNEXT();
			                 break;
		                     }
		                     else if(Rxml.isCharacters())
		                     {
			                 READNEXT();
		                     }
		                     else if(Rxml.isStartElement())
		                     {
			                 if(Rxml.name() == "State")
			                 {
				              ReadStateElement();
			                 }
			                 else if(Rxml.name() == "Room")
			                 {
				              ReadRoomElement();
			                 }
			                 else if(Rxml.name() == "Potencial")
			                 {
			                      ReadPotencialElement();
			                 }
			                 READNEXT();
		                 }
		                 else
		                 {
			             READNEXT();
		                 }
	                }
	        }
        }
	else
	{
	    READNEXT();
	}

	file.close();

        if (Rxml.hasError())
	{
	   std::cerr << "Error: Failed to parse file "
	             << qPrintable(filename) << ": "
	             << qPrintable(Rxml.errorString()) << std::endl;
        }
	else if (file.error() != QFile::NoError)
	{
	    std::cerr << "Error: Cannot read file " << qPrintable(filename)
	              << ": " << qPrintable(file.errorString())
	              << std::endl;
	}
}



//Example for Room Element

void MyXMLClass::ReadRoomElement()
{
	while(!Rxml.atEnd())
	{
		if(Rxml.isEndElement())
		{
			READNEXT();
			break;
		}
		else if(Rxml.isStartElement())
		{
			QString roomelement = Rxml.readElementText();   //Get the xml value
			READNEXT();
			break;
		}
		else if(Rxml.isCharacters())
		{
			READNEXT();
		}
		else
		{
			READNEXT();
		}
	}

}

sample.xml

<?xml version="1.0"?>
<LAMPS>
    <LIGHT1>
        <State>statevalue</State>
        <Room>roomvalue</Room>
        <Potencial>potencialvalue</Potencial>
    </LIGHT1>
</LAMPS>

What is READNEXT?

Rxml.readNext(); = READNEXT

what that fuck

Thanks !

what is the correct way to write these ?
ReadStateElement()
ReadRoomElement()