Thanks Dave for the quick reply, I'll try what you suggest. -will
-----Original Message----- From: David Bertoni [mailto:[EMAIL PROTECTED] Sent: Monday, February 12, 2007 1:50 AM To: xalan-c-users@xml.apache.org Subject: Re: Problem evaluating XPath expressions Will Sappington wrote: > Hello all, > > > > I'm writing a configuration utility that we call an "application > profile" or simply profile, that is essentially an ini file on > steroids. It's a hierarchical structure - application/section/item - > that allows multiple applications to use a single profile. I'm > migrating it from "key = value" format to XML and I'm using Xalan/Xerces > for evaluating XPath expressions to retrieve the configuration items. > ... > > XalanDocumentPrefixResolver thePrefixResolver(_pXmlDoc); > > > > where _pXmlDoc is in the Profile class private member data > From looking at your code, I suspect the _pXmlDoc data member is pointing to an instance that's already been destroyed. Here's what the comments for XMLParserLiason::parseXMLStream() say: /** * Parse the text pointed at by the reader as XML, and return a DOM * Document interface. It is recommended that you pass in some sort of * recognizable name, such as the filename or URI, with which the reader * can be recognized if the parse fails. * * The liaison owns the XalanDocument instance, and will delete it when * when asked (see DestroyDocument()), or when the liaison is reset, or * goes out of scope. */ So, the instance you created is destroyed when the XalanSourceTreeParserLiaison instance is destroyed in Profile::_openXmlDoc(). In general, Xalan-C implements very tightly controlled ownership of objects. The easiest way for you to handle this is to make the XalanSourceTreeParserLiason instance a member of your class. Dave
