On 12/28/2011 02:19 AM, John J. Boyer wrote:
> I need to delete some nodes from a parse tree. So I use xmlUnlinkNode
> and then xmlFree. However, when I output the tree with xmlDumpDoc the
> nodes are still there. What am I missing?
It's difficult to say without seeing what you're doing exactly.
Here's what works for me (sample program which deletes the first child
element of the document root):
xmlDocPtr pDoc = xmlParseFile(pczFileName);
//error checking....
xmlNodePtr pRoot = xmlDocGetRootElement(pDoc);
//error checking...
xmlNodePtr pNext = pRoot->children;
int iDeleted = 0;
while (pNext)
{
if (pNext->type == XML_ELEMENT_NODE && !iDeleted)
{
xmlNodePtr pDelNode = pNext;
pNext = pNext->next;
xmlUnlinkNode(pDelNode);
xmlFree(pDelNode);
iDeleted = 1;
}
else
{
pNext = pNext->next;
}
}
xmlChar *pxBuf;
int iBufSize = 0;
xmlDocDumpFormatMemory(pDoc, &pxBuf, &iBufSize, 1);
fprintf(stdout, "Buffer out: %s\n", (const char*)pxBuf);
The input file:
$ cat t.xml
<people_list>
<person/>
<person/>
</people_list>
Sample output:
$ ./del t.xml
Buffer out: <?xml version="1.0"?>
<people_list>
<person/>
</people_list>
Is that what you're doing in your application?
All the best!
Piotr
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