Re: [xml] Another structured error question

On Fri, Nov 14, 2003 at 08:08:41PM +0100, Petr Pajas wrote:
Hi Daniel, All,

I'm trying to catch parsing errors via the structured error handler
API. I set up the structured handler, NULL the generic handler and
call xmlReadMemory (or similar). But the parsing error is still
printed on stderr via xmlParserError and I can't catch it. If I set
generic handler, it catches the error (but is called several times for
one error message, which is AFAIR also something you said you were
trying to eliminate in 2.6.x).

Is it a bug I can add to:

  yes please, I will have to debug those structured error handling
problem, and that's the best to force me to not forget about those :-(

I only found the following workaround so far:

1) create ctxt, 
2) setup generic handler to a (non-NULL!) function doing nothing
   (to suppress the xmlParserError print on stderr)
3) call xmlParseDocument(ctxt)
4) check the error in ctxt->lastError

Debugging down to __xmlRaiseError, I see the reason for this: channel
is set to ctxt->sax->error (which defaults to xmlParserError) just
before the error could possibly fall on a default xmlStructuredError.
And because serror is still NULL, channel is used.  That doesn't seem
easy to fix for a general case :-(


#include <unistd.h>
#include <libxml/parser.h>
#include <libxml/xmlerror.h>
#include <libxml/tree.h>

char* xmldoc = 
"<?xml version='1.0'?>"

LibXML_serror_handler(void *userData, xmlErrorPtr err) {
    printf("SERROR invoked\n");

main (void) {
    xmlDocPtr doc;
    xmlSetGenericErrorFunc( NULL ,  NULL);
    xmlSetStructuredErrorFunc( NULL , (xmlStructuredErrorFunc)LibXML_serror_handler);
    doc = xmlReadMemory(xmldoc, strlen(xmldoc), NULL, NULL, 0);

  Please attach it to the bug, once fixed and tweaked it could make a good
new code example.


Daniel Veillard      | Red Hat Network
veillard redhat com  | libxml GNOME XML XSLT toolkit | Rpmfind RPM search engine

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