And, just to reveal all of my puzzle: the source const char * const xml array
contains known-to-be-valid, well-formed XML which begins
"<casperAPI><trigger>..." and so that first XPath query should return a match
at <trigger>.
On Thursday 16 June 2005 08:17 am, Lonnie VanZandt wrote:
> Oh, there's an intervening method which resolves the context node from a
> XalanDOMString expression. That is:
>
> //! evaluate an XPath expression for a given XalanDOM and a given
> starting context
> void evaluateQuery( XalanDocument * const pXalanDoc,
> XalanDOMString xdsContext,
> XalanDOMString xdsPathExpr,
> NodeRefList& theResult,
> bool * const pbFound )
> {
> *pbFound = false;
>
> if ( (XalanDocument *) NULL != pXalanDoc )
> {
> // attempt to locate the requested context node
> XalanNode* const theContextNode =
> pMyXPathEvaluator->selectSingleNode( *pMyXalanSourceTreeDOMSupport,
> pXalanDoc,
> xdsContext.c_str(),
>
> pXalanDoc->getDocumentElement() );
>
> evaluateQuery( pXalanDoc,
> theContextNode, xdsContext, theResult, pbFound );
> }
> }
>
> and, of course, one more to go from const char*'s to XalanDOMString's (but
> that is just a one line wrapper which hides the XalanDOMString(const char *
> const).c_str() junk from the "client".
>
> On Thursday 16 June 2005 08:08 am, Lonnie VanZandt wrote:
> > The method which calls selectNodeList (and wherein selectNodeList dies):
> >
> > //! evaluate an XPath expression for a given XalanDOM and a given
> > starting context
> > void evaluateQuery( XalanDocument * const pXalanDoc,
> > XalanNode * const theContextNode,
> > XalanDOMString xdsPathExpr,
> > NodeRefList& theResult,
> > bool * const pbFound )
> > {
> > *pbFound = false;
> >
> > if ( (XalanDocument * const) NULL != pXalanDoc )
> > {
> > // a null node indicates that the context couldn't be found
> > if ( (XalanNode * const) NULL != theContextNode)
> > {
> > // OK, let's evaluate the expression...
> > pMyXPathEvaluator->selectNodeList(
> > theResult,
> > *pMyXalanSourceTreeDOMSupport,
> > theContextNode,
> > xdsPathExpr.c_str(),
> > pXalanDoc->getDocumentElement() );
> >
> > * pbFound = ( !theResult.empty() );
> > }
> > }
> > }
> >
> > The calling method (in a derived class which contains the above method):
> >
> > NodeRefList nodeRefList;
> > bool bFound = false;
> > pDBDXMLProcessor->evaluateQuery( pRequestXalanDoc,
> > "/casperAPI", "trigger", nodeRefList, &bFound );
> >
> > The context initialization in the base class' constructor:
> >
> > try
> > {
> > XMLPlatformUtils::Initialize();
> >
> > // Initialize Xalan.
> > XalanTransformer::initialize();
> >
> > // initialize the XalanSourceTree
> > pMyXalanSourceTreeInit = new XalanSourceTreeInit();
> >
> > // We'll use these to parse the XML file.
> > pMyXalanSourceTreeDOMSupport = new XalanSourceTreeDOMSupport();
> > pMyXalanSourceTreeParserLiaison = new
> > XalanSourceTreeParserLiaison( *pMyXalanSourceTreeDOMSupport );
> >
> > // Hook the two DOM manager and the Xalan parser together
> >
> > pMyXalanSourceTreeDOMSupport->setParserLiaison(
> > pMyXalanSourceTreeParserLiaison );
> >
> > // our XPathEvaluator
> > XPathEvaluator::initialize();
> > pMyXPathEvaluator = new XPathEvaluator();
> >
> > // instantiate an Xalan Transformer
> > pMyXalanTransformer = new XalanTransformer();
> > }
> > catch (const XMLException& toCatch)
> > {
> > std::cerr << "Xalan and Xerces initialization failed. Error code
> > was "
> > << toCatch.getCode() << "." << std::endl;
> >
> > //throw toCatch;
> > }
> >
> > And, finally, parsing of pRequestXalanDoc:
> >
> > //! parse the given XML input into a read-only Xalan DOM Document
> > XalanDocument * const parseString( const char * const
> > sXmlInputCharArray ) const
> > {
> > // wrap the input string within a stream handler
> > std::istringstream issXml( sXmlInputCharArray );
> >
> > // promote the input XML character buffer into an XSLTInputSource
> > const XSLTInputSource xisXml( issXml );
> >
> > XalanDocument * const pXalanDoc =
> > pMyXalanSourceTreeParserLiaison->parseXMLStream( xisXml );
> >
> > return pXalanDoc;
> > }
> >
> > On Thursday 16 June 2005 07:59 am, Axel Weiß wrote:
> > > Lonnie VanZandt wrote:
> > > > Not quite, the crash still occurs in the same location - but
> > > > assuredly it is a good idea to call that initialize() method
> > > > nevertheless.
> > >
> > > Hi Lonnie,
> > >
> > > would you, please, provide us with some example you're working on?
> > >
> > > Just to be in-line with what you're telling about...
> > >
> > > Cheers,
> > > Axel
> >
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