Re: Strange Runtime Problem

See below ...

Anmol Bhasin wrote:
> Hello all,
> 
> I have been using the EXPAT for a while, however this time around I am 
> facing a stange error.
> I am using the expat library in the dynamic link mode, with my code just 
> including expat.h.
> 
> This is a small C++ Program with once class which is essentially using 
> expat as the parser for some XML documents.  Here is a snippet of my ant 
> file :
> 
>  <target name="CorpusReader" depends="init">
>            <echo>Building Object for CorpusReader ...</echo>
>           <exec executable="g++">
>               <arg line="-g -I${include} -I${expat_inc} -L${lib_expat} 
> -lexpat -o build/CorpusReader"/>
>             <arg file="${src}/CorpusReader.cpp"/>
>           </exec>
> </target>
> 
> 
> where lib_expat is <expat_dir>/lib
> and expat_inc is <expat_dir>/include
> 
> The compile goes fine, however during the running of the Program I get a 
> SEG FAULT at the point where the first chunk of my data is sent across 
> XML_Parse. The GDB reads
> 
> Parsing 
> File../trec/software/ConceptGraphBuilder/transitions/data/temp/layers.xml
> 
> Program received signal SIGSEGV, Segmentation fault.

This means you de-referenced a null, or otherwise invalid pointer.

> 0x4001a798 in XML_GetBuffer (parser=0x0, len=1024) at lib/xmlparse.c:1465

Lo and behold, you'ved called XML_GetBuffer and passed in a null pointer as the 
parser structure.  Review your code and pass in the correct parser address. Did 
you create one?

> 1465    lib/xmlparse.c: No such file or directory.
>         in lib/xmlparse.c
> Current language:  auto; currently c
> 
> I can't figure out for nuts the problem. Any help would be appreciated.
> 
> regards,
> Anmol
>