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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