RE: [xml] xmlCopyNode error

[martyn 2 russell bt com]

Ok, I have figured out the dodgy roster problem (genuine mistake on my part
with buf sizes), however three things:

1st: If I use xmlUnlinkNode() and xmlFreeNode() I then have to set the node
(ctxt->myDoc->children) to NULL for the application to continue, else I get
the same xmlCopyNode error I originally reported.

2nd: If I use xmlFreeNodeList() instead of xmlFreeNode(), I need NOT set the
node to NULL to keep the application from crashing.

3rd: The documentation doesn't state whether the node is set to NULL when
calling xmlFreeNode() or xmlFreeNodeList(), Does it?

In the first case, should I have to set my node to NULL?

Regards,

Martyn

-----Original Message-----
From: martyn 2 russell bt com [mailto:martyn 2 russell bt com]
Sent: Wednesday, April 24, 2002 7:05 PM
To: xml gnome org
Subject: RE: [xml] xmlCopyNode error


To initiate the parser, i use the following function,

  ctxt = xmlCreatePushParserCtxt(NULL, NULL, NULL, 0, NULL);

Then when i receive information on the socket, I call the following
function:

  xmlParseChunk(ctxt,buf,nBytes,0);

  if(ctxt->myDoc->children != NULL)
    {
      xmlNodePtr myCopy = NULL;

      myCopy = xmlCopyNode(ctxt->myDoc->children,1);

      /* parse doc by type - i.e iq/message.... */
      if(myCopy != NULL)
        jb_ParseType(myCopy);

      xmlUnlinkNode(ctxt->myDoc->children);
      xmlFreeNode(ctxt->myDoc->children);

      //ctxt->myDoc->children = NULL;
    }

The funny thing is, that it's fine up to that xml input from jabber ("<iq
id='3' type='result'/>"), however, if I uncomment the line above
("//ctxt->myDoc->children = NULL;") I have no problem at that stage, instead
the input when i receive the roster is dodgy, which is really confusing
(below):  And the print out of the contents is just blank spaces????

62 of 62 --> '
<iq id="4" type="get"><query xmlns="jabber:iq:roster"/></iq>
'
266 <-- '<iq id='4' type='result' from='russelm6 coyote/testclient'><query
xmlns='jabber:iq:roste
r'><item jid='cockersj coyote' subscription='both'>
   <group>Work</group>
  </item><item jid='bootonlj coyote' subscription='both'>
   <group>Work</group>
  < 4
°åÿ¿
********** start printing tree node:0x080a9c18 *********
-> name:'iq'
  -> name:'query'
    -> name:'item'
       - content:'
   '
      -> name:'group'
         - content:'Work'
       - content:'
  '
    -> name:'item'
       - content:'
   '
      -> name:'group'
         - content:'Work'
       - content:'
  '
********** stop printing tree node:0x080a9c18  *********

Any ideas??

Regards,

Martyn



-----Original Message-----
From: Daniel Veillard [mailto:veillard redhat com]
Sent: Wednesday, April 24, 2002 6:46 PM
To: martyn 2 russell bt com
Cc: xml gnome org
Subject: Re: [xml] xmlCopyNode error


On Wed, Apr 24, 2002 at 06:34:34PM +0100, martyn 2 russell bt com wrote:
> I am trying to copy a node which has been parsed from a Jabber input
stream.
> However when I do, the name is "" and the contents of the node I am trying
> to copy is out of bounds? Why is this?  This only happens for the input
"<iq
> id='3' type='result'/>".  I have managed to parse other bits and pieces
fine

 hoh Jabber, nice ;-)

> and not had this problem, can anyone help?
>
> The gdb output is show below:
>
> 26 <-- '<iq id='3' type='result'/>'
>
> Program received signal SIGSEGV, Segmentation fault.
> [Switching to Thread 1024 (LWP 18377)]
> 0x402f30d0 in xmlStrdup () from /usr/lib/libxml2.so.2
> (gdb) up
> #1  0x4030828e in xmlStaticCopyNode () from /usr/lib/libxml2.so.2
> (gdb) up
> #2  0x40308517 in xmlCopyNode () from /usr/lib/libxml2.so.2
> (gdb) up
> #3  0x080550ae in JB_ParseInput (buf=0xbfffe570 "<iq id='3'
> type='result'/>",
>     nBytes=26) at ../jb_parse.c:165
> (gdb) p (*ctxt->myDoc->children)
> $1 = {_private = 0x80a9360, type = 134912736, name = 0x80a9ae0 "",

  how did you got a chidl without name ???

>   children = 0x80aac08, last = 0x0, parent = 0x80aab28, next = 0x80a9398,
>   prev = 0x0, doc = 0x0, ns = 0x11,
>   content = 0x65707974 <Address 0x65707974 out of bounds>,
>   properties = 0x404e3600, nsDef = 0x0}

  Seems there is something really strange with the way your parser
context is set up. I think I know what you're trying to do but without
knowing what are the parameters passed to xmlCopyNode() it's nearly
impossible to find out where is the trouble.

Daniel

-- 
Daniel Veillard      | Red Hat Network https://rhn.redhat.com/
veillard redhat com  | libxml GNOME XML XSLT toolkit  http://xmlsoft.org/
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