[xslt] using xsltSaveResultTo()

[Daniel Kelley <dkelley otec com>]

Hi-

I've got a small program that takes a piece of xml, applies a stylesheet,
and calls xsltSaveResultToFile to print the results to stdout.  I'm trying
to modify this to save the results to a buffer in memory using
xsltSaveResultsTo(), but I'm not having much luck.  Here's a snippet from
what I've got:


[snippet]

        res = xsltApplyStylesheet(sheet, doc, NULL);

        if (res == NULL)
                print_err(ERR_T_CGI, "Applying sheet failed.");

        xml_buf = xmlAllocOutputBuffer(NULL);

        if (xml_buf == NULL)
                print_err(ERR_T_CGI, "unable to alloc xml_buf.");

        writ = xsltSaveResultTo(xml_buf, res, sheet);

        if (writ == -1 || !writ)
                print_err(ERR_T_CGI, "unable to save xslt results.");

        buff = malloc(sizeof(char) * 20000);

        writ = xmlOutputBufferWriteString(xml_buf, buff);

        if (writ == -1 || !writ)
                print_err(ERR_T_CGI, "unable to write xml_buf to
string.");

        return buff;

[/snippet]


in this snippet, the call to xsltSaveResultTo() always returns 0.  I'm
confident that I'm doing something wrong with how I'm allocating xml_buf
(declared as type xmlOutputBufferPtr);  if i change the
xsltSaveResultTo() call to 

	writ = xsltSaveResultToFile(stdout, res, sheet);

I get the transformed xml written to stdout.

I've been slogging through the definitions at

http://xmlsoft.org/XSLT/html/libxslt-utils.html, but have been unable to
figure out how to properly allocate a buffer for use with
xsltSaveResultTo(), or if there's a better way to do this.  Any
suggestions or pointers would be greatly appreciated.

Thanks-

Dan