SAX2 Progressive Parse

[Mike Brennan <ps...@pittstate.edu>]

Greetings:

First, I apologize if this is the wrong forum for this question.
I couldn't find any that seemed more appropriate.

Platform details: Xerces C++ 2.3.0,  AIX 5.1,  xlC 5.0.2 

I've been trying to learn Xerces C++ by reading the documentation,
looking at the source, and modifying the provided sample programs.
I've been attempting to take a first pass at progressive parsing
via SAX2 by modifying the sample program SAX2Print.cpp to use
parseFirst() and parseNext().

When I run the modified program, it aborts with the message
"IOT/Abort trap(coredump)".

Details:

I began by making a simple modification to the sample program
SAX2Print.cpp as follows.  I commented out the two lines
in the try block shown below, and then added the additional
code as shown:


    try
    {
        SAX2PrintHandlers handler(encodingName, unRepFlags, expandNamespaces);
        parser->setContentHandler(&handler);
        parser->setErrorHandler(&handler);
        //parser->parse(xmlFile);
        //errorCount = parser->getErrorCount();
    }

    catch (const XMLException& toCatch) { ... }

    // Added:

    XMLPScanToken token;

   if (!parser->parseFirst(xmlFile, token))
   {
       cerr << "scanFirst() failed\n" << endl;
       XMLPlatformUtils::Terminate();
       return 1;
   }

   ...


It appears that the abort occurs in the call

     fErrorHandler->resetErrors();

in the function 

     void SAX2XMLReaderImpl::resetErrors()

in the file

     SAX2XMLReaderImpl.cpp

That's as much as I've been able to determine in my debugging
attempts.  Any ideas or suggestions?  Should the modification to
the sample work as I intended?  Thanks.

-Mike

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Re: SAX2 Progressive Parse

[da...@us.ibm.com]

>    try
>    {
>        SAX2PrintHandlers handler(encodingName, unRepFlags,
expandNamespaces);
>        parser->setContentHandler(&handler);
>        parser->setErrorHandler(&handler);
>        //parser->parse(xmlFile);
>        //errorCount = parser->getErrorCount();
>    }
>
>    catch (const XMLException& toCatch) { ... }
>
>    // Added:
>
>    XMLPScanToken token;
>
>   if (!parser->parseFirst(xmlFile, token))
>   {
>       cerr << "scanFirst() failed\n" << endl;
>       XMLPlatformUtils::Terminate();
>       return 1;
>   }
>
>   ...
>
>
>It appears that the abort occurs in the call
>
>     fErrorHandler->resetErrors();
>
>in the function
>
>    void SAX2XMLReaderImpl::resetErrors()
>
>in the file
>
>     SAX2XMLReaderImpl.cpp

The instance of SAX2PrintHandlers you are using is local to the try/catch
block and is destroyed before you start parsing.  Moving it before the
block, or moving your parsing code within the block, will solve the
problem.

Dave


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