Re: [xml] Another structured error question

[Daniel Veillard <veillard redhat com>]

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:
> http://bugzilla.gnome.org/show_bug.cgi?id=126793
> ?

  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 :-(
>
>   Petr
>
> ___BEGIN_TEST_CASE___
> #include <unistd.h>
> #include <libxml/parser.h>
> #include <libxml/xmlerror.h>
> #include <libxml/tree.h>
>
> char* xmldoc = 
> "<?xml version='1.0'?>"
> "<foo></bar>";
>
> void
> LibXML_serror_handler(void *userData, xmlErrorPtr err) {
>     printf("SERROR invoked\n");
> }
>
>
> int
> main (void) {
>     xmlDocPtr doc;
>     xmlSetGenericErrorFunc( NULL ,  NULL);
>     xmlSetStructuredErrorFunc( NULL , (xmlStructuredErrorFunc)LibXML_serror_handler);
>     doc = xmlReadMemory(xmldoc, strlen(xmldoc), NULL, NULL, 0);
>     xmlFree(doc);
> }
> ___END_TEST_CASE___

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

Daniel

-- 
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