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 2 Usage
 *******
 
 The following C program using libIDL will parse an IDL file and print
 the Repository IDs of the interfaces in the IDL module.
 
      #include <assert.h>
      #include <stdio.h>
      #include <stdlib.h>
      #include <libIDL/IDL.h>
 
      gboolean
      print_repo_id (IDL_tree_func_data *tfd, gpointer user_data)
      {
      	char *repo_id = NULL;
 
      	if (IDL_NODE_TYPE (tfd->tree) == IDLN_INTERFACE)
      		repo_id = IDL_IDENT_REPO_ID (IDL_INTERFACE (tfd->tree).ident);
 
      	if (repo_id)
      		printf ("%s\n", repo_id);
 
      	return TRUE;
      }
 
      int
      main (int argc, char *argv[])
      {
      	IDL_tree tree;
      	IDL_ns ns;
      	char *fn;
      	int rv;
 
      	if (argc < 2) {
      		fprintf (stderr, "usage: %s <file>\n", argv[0]);
      		exit (1);
      	}
      	fn = argv[1];
 
      	rv = IDL_parse_filename (fn, NULL, NULL, &tree, &ns, 0, IDL_WARNING1);
 
      	if (rv == IDL_ERROR || rv < 0) {
      		if (rv < 0)
      			perror (fn);
      		exit (1);
      	}
      	IDL_tree_walk_in_order (tree, print_repo_id, NULL);
      	IDL_ns_free (ns);
      	IDL_tree_free (tree);
 
      	return 0;
      }
 

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