Re: [xml] Trying to use SAX

[Daniel Veillard <veillard redhat com>]

On Tue, Jan 10, 2006 at 05:40:37PM -0500, Allen, Jack wrote:
>   try to avoid it ! Use the xmlReader if you have a choice.
> @@@@@@@@@@
> I choose the SAX API because from what I read it would use less memory over
> all and possibly be a little faster for my needs. The other APIs seem to
> have to read the complete XML data and build a tree, then you have to search
> the tree for the keywords you want to use. Where as the SAX API allowed
> building the information from the keywords as the XML data is being
> processed.

  The XML reader is also  a streaming API, simpler to work with
    http://xmlsoft.org/xmlreader.html
> > I have setup the xmlSAXHandler
> > to callback my functions. The startDocument one works fine. But before
> > it calls my startElement function it takes a memory access error.
> > Running my program with gdb the backtrace looks like:
>
>   is that a sax V2 handler ? 
> @@@@@@@@@@
> No it was not and that was the problem. I had to look in the parser.h file
> to see that the xmlSAXHandler had more elements in it for SAX 2. The example
> I was using as a guide must have been for SAX 1. After changing my functions
> and assigning them to the correct element in xmlSAXHandler things are
> working as I thought they should.
> @@@@@@@@@@
>   Probably an error building the SAX handler or in the callbacks. Use the
> xmlReader or the existing testSAX.c code as a guidance. Remember we can't 
> debug your code.
> @@@@@@@@@@
> Where can I find the testSAX.c code on the web? Like I said I am using what
> came with RedHat AS 4. So I am sure it is not the latest version of libxml2.
> @@@@@@@@@@

  testSAX.c is part of the source release, you can find it in the
tar.gz or by installing the source RPM for libxml2 coming from RHEL.

Daniel

-- 
Daniel Veillard      | Red Hat http://redhat.com/
veillard redhat com  | libxml GNOME XML XSLT toolkit  http://xmlsoft.org/
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