Xerces-C++ 3.2.0 encountering 'unexpected end of input"

[Bill Moo <rt...@sighup.eu>]

Hello,

I am using Xerces-C++ 3.2.0 with Visual Studio 2017 Community Edition on 
Windows 10 but when trying to re-validate an altered XML document I am 
encountering a Fatal error saying “unexpected end of input”.

But what is causing this error escapes me so I would appreciate your 
input. I get the XML in question from a SOAP service and pass it through 
a DOMParser to validate it using the Schema cited in the XML, and in 
most cases this works as intended, but there are instances where the 
Schema to be used is not provided in the XML so evidently the parser fails.

When the parse fails I read a known element within the XML document and 
from it I can elicit enough information to know which XSD I need to 
validate against so, I add both an 
xmlns:xs=http://www.w3.org/2001/XMLSchema-instance attribute pair and an 
xs:noNamespaceSchemaLocation=“XX.xsd” attribute pair to the XML.

With this done I now want to re-validate my modified XML so using this 
code :

XMLCh * pLS = XMLString::transcode("LS");
	DOMImplementation * pImpl = 
DOMImplementationRegistry::getDOMImplementation(pLS);
	DOMLSSerializer * pSerialiser = 
((DOMImplementationLS*)pImpl)->createLSSerializer();
	DOMConfiguration * pDomConfiguration = pSerialiser->getDomConfig();
	pDomConfiguration->setParameter(XMLUni::fgDOMWRTFormatPrettyPrint, true);
	XMLCh * pXML = pSerialiser->writeToString((DOMNode *)getDocument());
	xercesc::MemBufInputSource mbis((const XMLByte*) pXML, 
XMLString::stringLen(pXML), "in-memory", false);;

…
domParser->parse(mbis)

It is during this ‘re-validation’ that I encounter the aforementioned 
error. However, on inspection the size of pXML is that of the modified 
XML when it is saved to disk and the file shows the changes and 
correctly validates when loaded in to Oxygen XML Developer. I have been 
scratching my head over this for sometime now but making no progress. 
Some of the files are quite large 20+MB but equally some files of these 
sizes can validate on first pass.

I would appreciate your thoughts on this as I’m at a total loss.

-- 
Regards,

Bill