XML Parsing in Qt 3.3

I am trying to parse through a group of XML files in Qt 3.3.7 following the Blanchette and Summerfield guide book on how to parse XML files using SAX. I have created a class called InterceptReader which looks identical to their SaxHandler class except instead of making a QListView I just have a couple QStrings to store information during the parsing and an additional function called getIds( char*, char* ) which creates 2 char*s and uses strdup( ) to allocate and create these char*s so I can use them outside the class. The two char *s are the pieces of data I am concerned about when parsing through the XML file and which is stored in QStrings.

I then in my calling class have a function called openXMLFiles( ) which looks like this (sorry for any misspellings, my code is on a stand-alone machine with no network connectivity):

Code:

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QDir xmlDir = QDir( xmlDirString, QString( "*.xml" ) );
InterceptReader intReader;
QXmlSimpleReader reader;
reader.setContentHandler( &intReader );
read.setErrorHandler( &intReader );
int numFiles = xmlDir.count( );
for( int i = 0 ; i < numFiles ; i++ )
{
   QFile file( xmlDir[i] );
   reader.parse( &file );
   char *ref;
   char *diff;
   intReader.getEventIds( ref, diff ); // These char*s are malloced using strdup
   if( ref && diff )
   {
      fprintf( stderr, "ref = %s, diff = %s\n", ref, diff );
      free( ref );
      ref = NULL;
      free( diff );
      diff = NULL;
   }
   else if( ref && !diff )
   {
      fprintf( stderr, "ref = %s\n", ref );
      free( ref );
      ref = NULL;
   }
   else if( !ref && diff )
   {
      fprintf( stderr, "diff = %s\n", diff );
      free( diff );
      diff = NULL;
   }
}

---

I plan to do more with this code later but wanted to make sure I was parsing it correctly. But for ever file I print out an error that says "Line 1, column 1: unexpected end of file". I have opened the XML files and they are filled out as well as being used by other programs. And I am basically using the SAX reader in the Qt 3 book verbatim as of right now. Any ideas why I would be getting this end of file error on a valid XML file? I am relatively new to XML but thought parsing through the file should be simple. Thanks for your help!

Could you show us your InterceptReader class? At least the error handling routines...

Code:

---

bool InterceptReader::fatalError( const QXmlParseException &exception )
{
   qWarning( "Line %d, column %d: %s", exception.lineNumber( ),
                    exception.columnNumber( ), exception.message( ).ascii( ) );
   return false;
}

---

Code:

---

bool InterceptReader::startElement( const QString &namespaceURI,
                                                     const QString &localName,
                                                     const QString &qName,
                                                     const QXmlAttributes &attribs )
{
   fprintf( stderr, "start element = %s\n", qName.ascii( ) );
   if( qName == QString( "ref_event" ) )
   {
      mOpenElement = qName;
   }
   else if( qName == QString( "dif_event" ) )
   {
      mOpenElement = qName;
   }
   return true;
}

---

Code:

---

bool InterceptReader::characters( const QString &str )
{
   if( mOpenElement == QString( "ref_event" ) )
   {
      mRefEventId= str;
   }
   else if( mOpenElement == QString( "dif_event" ) )
   {
      mDiffEventId= str;
   }
   return true;
}

---

Code:

---

bool InterceptReader::endElement( const QString &namespaceURI,
                                                     const QString &localName,
                                                     const QString &qName )
{
   fprintf( stderr, "end element = %s\n", qName.ascii( ) );
   if( qName == QString( "ref_event" ) )
   {
      mOpenElement = QString( "" );
   }
   else if( qName == QString( "dif_event" ) )
   {
      mOpenElement = QString( "" );
   }
   return true;
}

---

Like I said this is more of a test right now to make sure I can parse through the XML and grab certain items and later I will implement more of what I want to do with them. But this is my basic XML parser. Thanks for your continued help!

what is reader.parse( &file ) value?

What do you mean by

Quote:

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what is reader.parse( &file ) value?

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It returns false if that is what you mean?

I have run my code through DBX and my stack's last 6 lines looks like

Code:

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reader.parse( &file )
QXmlSimpleReader::parseBeginOrContinue
QXmlSimpleReader::parseProlog
QXmlSimpleReader::unexpectedEof
QXmlSimpleReader::reportParseError
InterceptReader::fatalError

---

Thanks again!

I found my problem at least as to why I got my error. My XMLs were in a different directory than my executable and when getting a QDir, using the [] operator only returned the filename and when I created the QFile I needed to make sure to include the actual path to the files when giving the filename to create the QFile. Now that I give the path/filename the files don't error out. Thanks for your help anyways!