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 $(srcdir)/tree1.res
       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   */
      30  static void
      31  print_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   */
      50  int
      51  main(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      return 0;
      82  }
      83  #else
      84  int main(void) {
      85      fprintf(stderr, "Tree support not compiled in\n");
      86      return 0;
      87  }
      88  #endif