Hi all!
I have a function that is attempting to parse an XML document in the
form of a string, the code for this function is as follows:
// Initialise variables
vl_MemBufID_str = "prodInfo";
// Create a new memory buffer input source
vl_MemBufInput_ptr = boost::shared_ptr<MemBufInputSource> (
new
MemBufInputSource(reinterpret_cast<const
XMLByte*>
(cp_Document_str.c_str()),
static_cast<m>
(cp_Document_str.size()),
vl_MemBufID_str.c_str(),
false));
// Convert the MemBufInputSource to a DomInputSource
vl_InputWrapper_ptr = boost::shared_ptr<Wrapper4InputSource> (
new
Wrapper4InputSource(vl_MemBufInput_ptr.get(),
false));
try
{
// Reset the document pool
Pvm_Parser->resetDocumentPool();
// Parse the XML string
Pvl_DomDocument =
Pvm_Parser->parse(*vl_InputWrapper_ptr.get());
// Create a new XMLDocument
vl_XmlDocument_ptr = boost::shared_ptr<Ctxw_XmlDocument>
(
new
Ctxw_XmlDocument
(Pvl_DomDocument));
I can continuously use this code to parse documents for about 1 1/2 days
or so and then my program will crash. The actual crash occurs in the
destructor of XMLReader:
XMLReader::~XMLReader()
{
fMemoryManager->deallocate(fEncodingStr);
fMemoryManager->deallocate(fPublicId); // <-- Crash
fMemoryManager->deallocate(fSystemId);
delete fStream;
delete fTranscoder;
}
It appears it is attempting to deallocate a NULL pointer (fPublicId).
If I inspect the rest of the class it all looks ok so dosent really look
like memory corruption? I also don't understand how the code appears to
work successfully for 1 1/2 days prior to seeing this error ?
The actual stack trace is as follows:
Xercesc_2_5::XMLReader::~XMLReader() Line 425
Xercesc_2_5::XMLReader::`scalar deleting destructor'() + 0xf
Xercesc_2_5::ReaderMgr::reset() Line 970 + 0x1f
Xercesc_2_5::IGXMLScanner::scanDocument(const xerces_2_5::InputSource
&src={...}) Line 339
Xercesc_2_5::AbstractDOMParser::parse(const xerces_2_5::InputSource &
source={...}) Line 471
Xercesc_2_5::DOMBuilderImpl::parse(const xercesc_2_5::DOMInputSource &
source={...}) Line 469
Ctxw_XmlParser::ReadXml(const
std::basic_string<char,std::char_traits<char>,std::allocator<char>>&
cp_Document_str={...}) Line 881 + 0x48
...
...
I am using version 2.5 of Xerces taken from the nightly build on the
27/07/2004. The parser I am creating is a DOMBuilder and is created in
the class constructor with the following code :
// Create the implementation string
bool vl_Success_bl = XMLString::transcode("LS",
vl_TempStr_c, 99);
// Get the DOM implementation
Pvl_DOMImplementation =
DOMImplementationRegistry::getDOMImplementation(vl_TempStr_c);
// Create a new Xerces parser
Pvm_Parser = boost::shared_ptr<DOMBuilder>
((dynamic_cast<DOMImplementationLS*>(Pvl_DOMImplementation))->
createDOMBuilder(DOMImplementationLS::MODE_SYNCHRONOUS, 0));
// Set the error handler
SetXmlErrorHandler (vm_ErrorHandler);
If there is any further information I can provide that would be useful
please let me know.
Any pointers to the potential problem would be greatly appreciated,
Many thanks
Neil
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