XML, SAX2, QXmlContentHandler::characters( const QString& ch ) problem

[yellowmat]

Hi everybody !

I'm developping a program that reads a XML file and gets its data using SAX2. It works quite well, the function QXmlContentHandler::characters(const QString& ch) of my handler is called for each content between element but also at each line end ... maybe it takes care of the carriage return and/or line feed specific character ? Does someone have the same problem ?

Here is the content of my XML file (I have edited it using wordpad under Windows) :

<?xml version="1.0" encoding="ISO-8859-1"?>
<phonebook>
	<person>
		<type>Worker</type>
		<name>NAME_1</name>
		<firstname>FIRST_NAME_1</firstname>
		<phone>0123456789</phone>
	</person>
	<person>
		<type>Student</type>
		<name>NAME_2</name>
		<firstname>FIRST_NAME_2</firstname>
		<phone>9876543210</phone>
	</person>
</phonebook>

<?xml version="1.0" encoding="ISO-8859-1"?>
<phonebook>
	<person>
		<type>Worker</type>
		<name>NAME_1</name>
		<firstname>FIRST_NAME_1</firstname>
		<phone>0123456789</phone>
	</person>
	<person>
		<type>Student</type>
		<name>NAME_2</name>
		<firstname>FIRST_NAME_2</firstname>
		<phone>9876543210</phone>
	</person>
</phonebook>

To copy to clipboard, switch view to plain text mode 

The code of my handler is :

bool CMySaxContentHandler::startElement(const QString& namespaceURI, const QString& localName, 
		const QString& qName, const QXmlAttributes& attribute)
{
	szIndent += "    ";
	szMessage = szIndent + "<" + qName + ">";
	qDebug("%s", szMessage.ascii());
 
	return true;
}
 
bool CMySaxContentHandler::endElement(const QString& namespaceURI, const QString& localName, const QString& qName)
{
	szMessage = szIndent + "</" + qName + ">";
	qDebug("%s", szMessage.ascii());
	szIndent.remove(0, 4);
 
	return true;
}
 
bool CMySaxContentHandler::characters(const QString& ch)
{
	szIndent += "    ";
	szMessage = szIndent + ch;
	qDebug("%s", szMessage.ascii());
	szIndent.remove(0, 4);
 
	return true;
}

bool CMySaxContentHandler::startElement(const QString& namespaceURI, const QString& localName, 
		const QString& qName, const QXmlAttributes& attribute)
{
	szIndent += "    ";
	szMessage = szIndent + "<" + qName + ">";
	qDebug("%s", szMessage.ascii());

	return true;
}

bool CMySaxContentHandler::endElement(const QString& namespaceURI, const QString& localName, const QString& qName)
{
	szMessage = szIndent + "</" + qName + ">";
	qDebug("%s", szMessage.ascii());
	szIndent.remove(0, 4);

	return true;
}

bool CMySaxContentHandler::characters(const QString& ch)
{
	szIndent += "    ";
	szMessage = szIndent + ch;
	qDebug("%s", szMessage.ascii());
	szIndent.remove(0, 4);

	return true;
}

To copy to clipboard, switch view to plain text mode 

... where szIndent and szMessage are two QString members.

The code used to parse my XML file is the following :

QXmlSimpleReader xsr;
 	CMySaxContentHandler handler;
	xsr.setContentHandler(&handler);
	QXmlInputSource xis(QFile("test_without_dtd.xml"));
	xsr.parse(&xis);

QXmlSimpleReader xsr;
 	CMySaxContentHandler handler;
	xsr.setContentHandler(&handler);
	QXmlInputSource xis(QFile("test_without_dtd.xml"));
	xsr.parse(&xis);

To copy to clipboard, switch view to plain text mode 

and it produces the following output :

<phonebook>
 
 
        <person>
 
 
            <type>
                Worker
            </type>
 
 
            <name>
                NAME_1
            </name>
 
 
            <firstname>
                FIRST_NAME_1
            </firstname>
 
 
            <phone>
                0123456789
            </phone>
 
 
        </person>
 
 
        <person>
 
 
            <type>
                Student
            </type>
 
 
            <name>
                NAME_2
            </name>
 
 
            <firstname>
                FIRST_NAME_2
            </firstname>
 
 
            <phone>
                9876543210
            </phone>
 
 
        </person>
 
 
    </phonebook>

<phonebook>
        
	
        <person>
            
		
            <type>
                Worker
            </type>
            
		
            <name>
                NAME_1
            </name>
            
		
            <firstname>
                FIRST_NAME_1
            </firstname>
            
		
            <phone>
                0123456789
            </phone>
            
	
        </person>
        
	
        <person>
            
		
            <type>
                Student
            </type>
            
		
            <name>
                NAME_2
            </name>
            
		
            <firstname>
                FIRST_NAME_2
            </firstname>
            
		
            <phone>
                9876543210
            </phone>
            
	
        </person>
        

    </phonebook>

To copy to clipboard, switch view to plain text mode 

How could I know if the parameter of the characters handler function must be process if I am not sure it is an element content or something else ?

Thanks for your help.

[jacek]

Maybe it will be enough if you check with a regexp whether ch contains only whitespace followed by '\n'?

[yellowmat]

Ok, I have tryied what you adviced me and it is ok.

I did :

static int i = -1;
	i = ch.find( QRegExp("\n"), 0 );
 
	if( i == -1 )
	{
		szIndent += "    ";
		szMessage = szIndent + ch;
		qDebug("%s", szMessage.ascii());
		szIndent.remove(0, 4);
	}

static int i = -1;
	i = ch.find( QRegExp("\n"), 0 );

	if( i == -1 )
	{
		szIndent += "    ";
		szMessage = szIndent + ch;
		qDebug("%s", szMessage.ascii());
		szIndent.remove(0, 4);
	}

To copy to clipboard, switch view to plain text mode 

and the output is now :

<phonebook>
        <person>
            <type>
                Worker
            </type>
            <name>
                NAME_1
            </name>
            <firstname>
                FIRST_NAME_1
            </firstname>
            <phone>
                0123456789
            </phone>
        </person>
        <person>
            <type>
                Student
            </type>
            <name>
                NAME_2
            </name>
            <firstname>
                FIRST_NAME_2
            </firstname>
            <phone>
                9876543210
            </phone>
        </person>
    </phonebook>
L

<phonebook>
        <person>
            <type>
                Worker
            </type>
            <name>
                NAME_1
            </name>
            <firstname>
                FIRST_NAME_1
            </firstname>
            <phone>
                0123456789
            </phone>
        </person>
        <person>
            <type>
                Student
            </type>
            <name>
                NAME_2
            </name>
            <firstname>
                FIRST_NAME_2
            </firstname>
            <phone>
                9876543210
            </phone>
        </person>
    </phonebook>
L

To copy to clipboard, switch view to plain text mode 

Thanks jacek