Re: [xml] Best way to do C Struct <-> XML Node tree?

[Tyler MacDonald <tyler yi org>]

Vedantam, Pavan <Pavan Vedantam fmcti com> wrote:
> Hi Tyler,
>
> I implemented something similar to what you are doing, this is what I
> do, "read the contents of an XML file directly to a C Struct, and also
> write back to the XML file with the values from the C struct", I have an
> XML file which is similar to the one below,
>
> <?xml version="1.0" encoding="UTF-8" ?> 
>  <!--  Sample template of the XML file to be used --> 
> <XML_TO_C>
>   <bb type="string">XML is the in thing !!</bb> 
>   <ex2 type="array" size="6">10,20,30,786,50,80</ex2> 
> </XML_TO_C>
>
> Hope this helps,

        Interesting approach! I was thinking of something schema-independant
though. I've got it working now, there's just one aggrivating bit of C code
that i have to do to translate between printf formatting codes and C
datatypes (you'd figure something like this would be part of the libc
core...)

#define DATA2XML(s,t) if(!strcmp(description.format, s)) { sprintf((char*)__buffer, description.format, 
*((t*)data)); }

xmlNodePtr bt_data2xml(xmlNodePtr parent, bt_xml_node description, void*
data) {
    if(!strcmp(description.format, "%s")) {
        strcpy((char*)__buffer, (char*)data);
    }
    else DATA2XML("%llu", u_int64_t)
    else DATA2XML("%lu", time_t)
    else DATA2XML("%u", u_int32_t)
    else {
        __buffer[0] = 0;
        fprintf(stderr, "Warning: %s is null: unknown format '%s'\n",
description.name, description.format);
    }
    
    return xmlNewTextChild(parent, NULL, description.name, __buffer);    
}

        Maybe one day I'll figure out a way to get rid of that, but it works
for now. :-)

                - Tyler