Loggin events using XML

[Nuno Esculcas <nu...@gmail.com>]

Hi,

I'm trying to use the xerces api to write the contents of my
application log. But i'm thinking that my approach is not the best
one, i need an approach that can write large amout of data and with a
considered speed (this is not the most important, the amount of data
is more important and i'm not achiving this objective).

So my approach is the following:

1) first step, i create the xml document if not exist:
DOMDocument* pcDoc = impl->createDocument(
// root element namespace URI.
XMLStr(XML_EXIF_LOG_DTD),
XMLStr(XML_EXIF_LOG_ROOT_ELEM_NAME), // root element name
0);
and then i save it using the:
LocalFileFormatTarget local(m_strLogFileFullName.c_str());
DOMWriter* pcSerializer = impl->createDOMWriter();
pcSerializer->writeNode(&local, *((DOMNode*)pcDoc));

2) after the xml file is created i open it (maybe my problem is
here):
xercesc::XercesDOMParser* m_pcDomParser = new
xercesc::XercesDOMParser;
m_pcDomParser->parse( m_strLogFileFullName.c_str() ) ;

and i save the variable m_pcDomParser for future use.

3) when i need to add a new log entry i do the following (this step could be
done a lot of times and in a very small interval):
xercesc::DOMDocument* pcDoc = m_pcDomParser->getDocument() ;
DOMElement* rootElem = pcDoc->getDocumentElement();
DOMElement* pcLogRec = pcDoc->createElement(XMLStr(XML_LOG_RECORD));
rootElem->appendChild(pcLogRec);

//... write the values for the correspondig xml elements

//then i saved it
DOMImplementation* pImp = pcDoc->getImplementation();
LocalFileFormatTarget local(m_strLogFileFullName.c_str());
DOMWriter* pcSerializer = pImp->createDOMWriter();
pcSerializer->writeNode(&local, *((DOMNode*)pcDoc)); <- i thing that the
problem of the speed is here because it writes the all xml info to the file
each time i do this....

And it's all...

The speed is not the desired one, but i can live with this, but my
biggest problem is that when i reach aproximilly the 22378 lines in
the xml document when i'm doing the following instruction of code:
LocalFileFormatTarget local(m_strLogFileFullName.c_str());
the xerces return an xercesc::XMLException saying "Could not open
file: ..."

Is there any limit of data in an xml file? how i can write more than
this limit?
And my approach is the best one? exist any problem with this aproach?
exist any another way of doing this (a better way)?

Thanks

-- 
Nuno Esculcas