source: vbox/trunk/src/libs/libxml2-2.6.30/doc/tutorial/includexpath.c@ 7931

<![CDATA[
#include <libxml/parser.h>
#include <libxml/xpath.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);
        if (context == NULL) {
                printf("Error in xmlXPathNewContext\n");
                return NULL;
        }
        result = xmlXPathEvalExpression(xpath, context);
        xmlXPathFreeContext(context);
        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;
        xmlDocPtr doc;
        xmlChar *xpath = (xmlChar*) "//keyword";
        xmlNodeSetPtr nodeset;
        xmlXPathObjectPtr result;
        int i;
        xmlChar *keyword;
                
        if (argc <= 1) {
                printf("Usage: %s docname\n", argv[0]);
                return(0);
        }

        docname = argv[1];
        doc = getdoc(docname);
        result = getnodeset (doc, xpath);
        if (result) {
                nodeset = result->nodesetval;
                for (i=0; i < nodeset->nodeNr; i++) {
                        keyword = xmlNodeListGetString(doc, nodeset->nodeTab[i]->xmlChildrenNode, 1);
                printf("keyword: %s\n", keyword);
                xmlFree(keyword);
                }
                xmlXPathFreeObject (result);
        }
        xmlFreeDoc(doc);
        xmlCleanupParser();
        return (1);
}
]]>