Re: [xml] Is this condition (xmlFreeNodeList) supposed to crash?

[Tomas Sieger <tomas sieger systinet com>]

Jose Commins wrote:
>     If I perform this:
>
>     output_root_element = xmlDocGetRootElement(output_doc);
>
>     xmlFreeNodeList(output_root_element);
>     xmlFreeDoc(output_doc);
>
>
>     I get a crash.
>
>     If I remove 'xmlFreeNodeList' it doesn't crash.  Now, I don't 
> normally use 'xmlFreeNodeList' but I've seen many examples on this list 
> that do so, therefore I put in the line of code just to see what 
> happened.  In my XML doc I have nodes attached to 'output_doc' that I've 
> created.  Is the above code supposed to crash or is there something I am 
> not aware of?
>
>
> Regards,
>         Jose.

Read the documentation. Well, xmlFreeNodeList() does not say a lot, but 
when you look at xmlFreeNode, it says:

  "This doesn't unlink the child from the list,
   use xmlUnlinkNode() first."

So, your problem is that you try to free the nodes twice: once using 
xmlFreeNodeList(), second via xmlFreeDoc().
Do not call xmlFreeNodeList() unless you also unlink the nodes from the 
tree.

hope it helps
 Tomas