On Sunday 19 October 2003 21:49, Daniel Veillard wrote:
On Sun, Oct 19, 2003 at 09:07:31PM +0200, Melvyn Sopacua wrote: Content-Description: signed dataHi, I'm trying to build a tree-like output from a given DTD. For that I need to know the 'indent level' I'm printing at, so I thought I'd pass an int pointer as data. That gives all kinds of weird results and it looks like the passed element is never initialized. If I set the level within the callback and set data to NULL, everything works correctly. The code in valid.c uses an xmlBuffer to pass to the callback and looking into hash.c there are a number or argument mangles, that don't make sense to me. What is assumed about this 'data' argument and can it be only an xmlBuffer?I have no idea what you're trying to do, nor what you problem is. xmlHashScan is used to traverse a hash table. The xmlHashScanner argment is called for each element in the table with the content in the hash, the data you passed and the name of the data in the hash as the third argument. There is nothing assumed about data.
This works:
========================================================================
void printElementStructured(xmlElementPtr el)
{
int level = 0;
switch( el->etype )
/* pass level along to content printer, but if called from
* content, the indent level is 0 again */
}
/* in main() */
table = dtd->elements; /* dtd is an xmlDtdPtr */
if( table != NULL )
{
xmlHashScan(table, (xmlHashScanner) printElementStructured, NULL);
}
========================================================================
This doesn't:
========================================================================
void printElementStructured(int *level, xmlElementPtr el)
{
int i;
for(i=0; i < *level ; i++ )
print("\t");
switch( el->etype )
...
}
/* in main() */
int level = 0;
table = dtd->elements;
if( table != NULL )
{
xmlHashScan(table, (xmlHashScanner) printElementStructured, &level);
}
========================================================================
I basically took this from xmlDumpElementDesc in valid.c and *thought* that
the data argument, would be passed in as first arg to the xmlHashScanner - in
fact - that part works, but the xmlElementPtr is invalid:
(gdb) print *el
$1 = {_private = 0x0, type = 134541632, name = 0x804e140 "", children =
0xbfbff584,
last = 0x8048611, parent = 0x2, next = 0xbfbff58c, prev = 0xbfbff598,
doc = 0xbfbff584, etype = 134514153, content = 0x804a13c,
attributes = 0xbfbff584, prefix = 0x80484ba "Ã", contModel = 0x80485f1}
--
Melvyn
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