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Annotation of embedaddon/libxml2/doc/examples/tree1.c, revision 1.1.1.1

1.1       misho       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:  */
                     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