Expat, decision making on element-name

From: Maarten Verhage (m_r_verhage_at_hotmail.com)
Date: 04/30/04 

Date: 30 Apr 2004 07:08:21 -0700

Hi All,

I've made a modified version of the Expat elements.c example. What I
want the program to do is to recognize a hardcoded
element-name/tag-name and then execute some code which has access to
the data(e.g. "Maarten Verhage" in XML file).

The current situation (problem) is:

1. The XML parser calls the function startElement when it finds a tag,
in this function I don't have access to the data between the tags.

2. The XML parser calls the function charHandler when it finds data,
in this function I don't have access to the tag-name.

Thank you!

-- below is the code I have now

-- start of XML file
<?xml version="1.0"?>
<person>
        <name>Maarten Verhage</name>
        <age>24</age>
</person>
-- end of XML file

-- start of C file
#include <stdio.h>
#include <conio.h>
#include "expat.h"

static void XMLCALL startElement(void *userData, const char *name,
const char **atts)
{
  int i;
  int *depthPtr = userData;

  for (i = 0; i < *depthPtr; i++)
  {
    putchar('\t');
        }
  // print elementname
  puts(name);

  *depthPtr += 1;
}

static void XMLCALL endElement(void *userData, const char *name)
{
  int *depthPtr = userData;
  *depthPtr -= 1;
}

static void XMLCALL charHandler(void *userData, const XML_Char *s, int
len)
{
        int i;
        for (i=0; i < len; i++)
        {
                fprintf(stdout, "%c", s[i]);
        }
}

int main(int argc, char *argv[])
{
  FILE *xmlfile;
  char buf[BUFSIZ];
  XML_Parser parser = XML_ParserCreate(NULL);
  int done;
  int depth = 0;
  XML_SetUserData(parser, &depth);
  XML_SetElementHandler(parser, startElement, endElement);
  XML_SetCharacterDataHandler(parser, charHandler);

        // open XML file
        if ((xmlfile = fopen("xml_test.xml", "r")) == NULL)
        {
                fprintf(stderr, "Error opening xml_test.xml\n");
                getch();
                return -1;
        }

  do
  {
    size_t len = fread(buf, 1, sizeof(buf), xmlfile);
    done = len < sizeof(buf);
    if (XML_Parse(parser, buf, len, done) == XML_STATUS_ERROR)
    {
      fprintf(stderr,
              "%s at line %d\n",
              XML_ErrorString(XML_GetErrorCode(parser)),
              XML_GetCurrentLineNumber(parser));
      return 1;
    }
  } while (!done);

  XML_ParserFree(parser);

  // close the XML file
  fclose(xmlfile);

  getch();
  return 0;
}
-- end of C file

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