xmlparsig

main.c

/* Code: */
#include <stdio.h>
#include <string.h>
#include "internodeAPI.h"
#include "xmlparsing.h"
#define BASEXML "tmp/nodeservice.xml"
/* sample XML file */
/* <internode> */
/* <api> */
/* <services count="1"> */
/*      <service type="Personal_ADSL" href="/api/v1.5/ID">ID_changed</service> */
/*      </services> */
/* </api> */
/* </internode> */
#define USAGEXML "tmp/nodeusage.xml"
#define HISTORYXML "tmp/nodehistory.xml"
/* sample XML file */
/* <internode><api> */
/* <service type="Personal_ADSL" request="history">ID_changed</service> */
/*      <usagelist> */
/*      <usage day="2013-01-25"> */
/*      <traffic name="total" unit="bytes">2084408661</traffic> */
/*      </usage> */
/*      <usage day="2013-01-26"> */
/*      <traffic name="total" unit="bytes">3038963621</traffic> */
/*      </usage> */
/*      </usagelist> */
/* </api></internode> */



int
main(int argc, char *argv[])
{

    char baseurl[80] = "https://customer-webtools-api.internode.on.net/api/v1.5/";
/* get the first xml for the internode userid */

    getNodeXml(baseurl, BASEXML); // this function takes url and saves the xml file to the path given using libcurl defined in internodeAPI.h 
    char * serviceID = getElementContent(BASEXML, "service");
    printf("%s\n", serviceID ); // i get ID_changed printed
    strcat(baseurl, serviceID);

    char history[80];
    strcpy(history, baseurl);
    strcat(history,"/history/");

    char usage[80];
    strcpy(usage, baseurl);
    strcat(usage,"/usage/");

    printf("%s\n",baseurl );    /* all of these work */
    printf("%s\n",history );
    printf("%s\n",usage );

    getNodeXml(usage, USAGEXML);
    getNodeXml(history, HISTORYXML);
    getNodeXml(baseurl, HISTORYXML);

    char * traffic = getElementContent(HISTORYXML, "traffic");

    printf("%s\n", traffic);	/* segmentation fault */

    return 0;
}


/* main.c ends here */

xmlparsig.c

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

static xmlDocPtr
getdoc (const char *filename);

static xmlXPathObjectPtr
getnodeset (xmlDocPtr docPtr, xmlChar *xpath);


/* takes two pointers to string as name of the document and element */
char *
getElementContent(char * filename, char * elementname)
{
    char  element[50] = "//"; 	/* needs // prefix for some reason */
    strcat(element, elementname);
    xmlDocPtr doc = getdoc(filename); /* xmlDocPtr to the document */
    xmlChar *xpath = (xmlChar*) element; /* is the name of the element */

    xmlXPathObjectPtr result = getnodeset (doc, xpath);
    xmlNodeSetPtr nodeset;
    int i;
    xmlChar *keyword = (xmlChar *) malloc(sizeof(char) * 50); // not sure how to do this properly

    if (result)                 /* if not NULL */
    {
        nodeset = result->nodesetval;
        for (i=0; i < nodeset->nodeNr; i++)
        {
            keyword = xmlNodeListGetString
                (doc, nodeset->nodeTab[i]->xmlChildrenNode, 1);

	    return (char *)keyword;
	    xmlFree(keyword);
        }
        xmlXPathFreeObject (result);
    }
    xmlFreeDoc(doc);
    xmlCleanupParser();
    return NULL;
}



/* takes pointer to a string of the name of the document */
static xmlDocPtr
getdoc (const char *filename)
{
    xmlDocPtr docPtr;
    docPtr = xmlParseFile(filename);

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

    return docPtr;
}


/* takes a xmlDocPtr to the xml document and a xmlChar string pointer as
 an element name */
static 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("There is no element of this name \n");
        return NULL;
    }
    return result;
}



/* xmlparsing.c ends here */