Re: [xml] Using xmlSAXHandler

[Henning Follmann <h follmann gmx de>]

On Thu, Apr 04, 2002 at 07:44:36AM -0800, Raghu Sampath wrote:
> Hi,
>
> I would like to use the xmlSAXHandler of the libxml2
> package. I am not sure of how to override the
> xmlSAXHandler class. Here's a sample of the code,
>
> struct XMLSAXHandler : public xmlSAXHandler
> {
>
> void startDocument(void * user_data)
> {
>    cout<<"this is the start of the document"<<endl;
>
> }
>
>
> void endDocument(void * user_data)
> {
>    cout<<"This is the end of the document"<<endl;
> }
> }
>
> Can you provide me with some sample code? How do the
> startDocument and endDocument callbacks work?

Though a structure is in some way a class with default public members,
this isn't really a SAX framework. It is SAX like.


void
startDoc(void * ctxt)
{

        printf("Start document\n");
}

void
endDoc(void * ctxt)
{

        printf("End document\n");
}


...

        xmlSaxHandler sax;
        xmlParserCtxtPtr ctxt;

...

        sax.startDocument=startDoc;
        sax.endDocument=endDoc;

        ctxt = xmlCreatePushParserCtxt ( &sax,
                                        &myData, /* whatever it is */
                                        NULL,
                                        0,
                                        NULL);


/* now feed with stream */

        while (n=fread(Buffer,  sizeof(char), 10,  input)){
                xmlParseChunk( ctxt, Buffer, n, 0);
        }

        /* to get an endDocument event we have to send EOF */
        Buffer[0]=EOF;
        xmlParseChunk( ctxt, Buffer, 10, 0);



Of course you can build an OO interface on top of it, but there is
already one:
http://lusis.org/~ari/xml++/

This might help.


Cheers,
Henning

-- 
Henning Follmann          |   hfollmann itcfollmann com
it consulting             |  http://www.itcfollmann.com