tree1.c revision d0cf7f6eea7331cc398c232d7879e4239d989e14 
1/**
2 * section: Tree
3 * synopsis: Navigates a tree to print element names
4 * purpose: Parse a file to a tree, use xmlDocGetRootElement() to
5 *          get the root element, then walk the document and print
6 *          all the element name in document order.
7 * usage: tree1 filename_or_URL
8 * test: tree1 test2.xml > tree1.tmp ; diff tree1.tmp tree1.res ; rm tree1.tmp
9 * author: Dodji Seketeli
10 * copy: see Copyright for the status of this software.
11 */
12#include <stdio.h>
13#include <libxml/parser.h>
14#include <libxml/tree.h>
15
16#ifdef LIBXML_TREE_ENABLED
17
18/*
19 *To compile this file using gcc you can type
20 *gcc `xml2-config --cflags --libs` -o xmlexample libxml2-example.c
21 */
22
23/**
24 * print_element_names:
25 * @a_node: the initial xml node to consider.
26 *
27 * Prints the names of the all the xml elements
28 * that are siblings or children of a given xml node.
29 */
30static void
31print_element_names(xmlNode * a_node)
32{
33    xmlNode *cur_node = NULL;
34
35    for (cur_node = a_node; cur_node; cur_node = cur_node->next) {
36        if (cur_node->type == XML_ELEMENT_NODE) {
37            printf("node type: Element, name: %s\n", cur_node->name);
38        }
39
40        print_element_names(cur_node->children);
41    }
42}
43
44
45/**
46 * Simple example to parse a file called "file.xml",
47 * walk down the DOM, and print the name of the
48 * xml elements nodes.
49 */
50int
51main(int argc, char **argv)
52{
53    xmlDoc *doc = NULL;
54    xmlNode *root_element = NULL;
55
56    if (argc != 2)
57        return(1);
58
59    /*
60     * this initialize the library and check potential ABI mismatches
61     * between the version it was compiled for and the actual shared
62     * library used.
63     */
64    LIBXML_TEST_VERSION
65
66    /*parse the file and get the DOM */
67    doc = xmlReadFile(argv[1], NULL, 0);
68
69    if (doc == NULL) {
70        printf("error: could not parse file %s\n", argv[1]);
71    }
72
73    /*Get the root element node */
74    root_element = xmlDocGetRootElement(doc);
75
76    print_element_names(root_element);
77
78    /*free the document */
79    xmlFreeDoc(doc);
80
81    /*
82     *Free the global variables that may
83     *have been allocated by the parser.
84     */
85    xmlCleanupParser();
86
87    return 0;
88}
89#else
90int main(void) {
91    fprintf(stderr, "Tree support not compiled in\n");
92    exit(1);
93}
94#endif
95