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libxml2 2.9.1

    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:     /*
   82:      *Free the global variables that may
   83:      *have been allocated by the parser.
   84:      */
   85:     xmlCleanupParser();
   86: 
   87:     return 0;
   88: }
   89: #else
   90: int main(void) {
   91:     fprintf(stderr, "Tree support not compiled in\n");
   92:     exit(1);
   93: }
   94: #endif