libxml2 test

libxml_parsig.c

/* Code: */
#include <libxml/parser.h>
#include <libxml/xpath.h>
#include <stdio.h>

xmlDocPtr
getdoc (char *docname)
{
    xmlDocPtr doc;
    doc = xmlParseFile(docname);

    if (doc == NULL ) {
        fprintf(stderr,"Document not parsed successfully. \n");
        return NULL;
    }

    return doc;
}

xmlXPathObjectPtr
getnodeset (xmlDocPtr doc, xmlChar *xpath)
{

    xmlXPathContextPtr context;
    xmlXPathObjectPtr result;

    context = xmlXPathNewContext(doc); /* initialize the context */
    if (context == NULL)	       /* test if null */
    {
        printf("Error in xmlXPathNewContext\n");
        return NULL;
    }
    result = xmlXPathEvalExpression(xpath, context); /* evaluates XPath location
						      in the given context */
    xmlXPathFreeContext(context); /* free the context memory */
    if (result == NULL)
    {
        printf("Error in xmlXPathEvalExpression\n");
        return NULL;
    }
    if(xmlXPathNodeSetIsEmpty(result->nodesetval))
    {
        xmlXPathFreeObject(result);
        printf("No result\n");
        return NULL;
    }
    return result;
}
int
main(int argc, char **argv)
{

    char *docname = "nodehistory.xml";
    xmlDocPtr doc;
    xmlChar *xpath = (xmlChar*) argv[1];
    xmlNodeSetPtr nodeset;
    xmlXPathObjectPtr result;
    int i;
    xmlChar *keyword;

    if (argc <= 1)
    {
        printf("Usage: %s keyword\n", argv[0]);
        return(0);
    }

    
    doc = getdoc(docname);
    result = getnodeset (doc, xpath);
    if (result)			/* if not NULL */
    {
	double total = 0;
        nodeset = result->nodesetval;
        for (i=0; i < nodeset->nodeNr; i++)
	{
            keyword = xmlNodeListGetString
		(doc, nodeset->nodeTab[i]->xmlChildrenNode, 1);
	    
            printf("content of the element: %s\n", keyword);
	    total = total + (atof((char *)keyword)/1000000);
            xmlFree(keyword);
        }
        xmlXPathFreeObject (result);
	printf("total megabytes used %f mb\n", total); /* sould be able to return this value to another function */
    }
    xmlFreeDoc(doc);
    xmlCleanupParser();
    return (1);
}

/* main.c ends here */