/** * section: xmlReader * synopsis: Parse multiple XML files reusing an xmlReader * purpose: Demonstrate the use of xmlReaderForFile() and * xmlReaderNewFile to parse XML files while reusing the reader object * and parser context.  (Note that the XMLReader functions require * libxml2 version later than 2.6.) * usage: reader4 <filename> [ filename ... ] * test: reader4 test1.xml test2.xml test3.xml > reader4.tmp && diff reader4.tmp $(srcdir)/reader4.res * author: Graham Bennett * copy: see Copyright for the status of this software. */ #include <stdio.h>#include <libxml/xmlreader.h> #ifdef LIBXML_READER_ENABLED static void processDoc(xmlTextReaderPtr readerPtr) {    int ret;    xmlDocPtr docPtr;    const xmlChar *URL;     ret = xmlTextReaderRead(readerPtr);    while (ret == 1) {      ret = xmlTextReaderRead(readerPtr);    }     /*     * One can obtain the document pointer to get insteresting     * information about the document like the URL, but one must also     * be sure to clean it up at the end (see below).     */    docPtr = xmlTextReaderCurrentDoc(readerPtr);    if (NULL == docPtr) {      fprintf(stderr, "failed to obtain document\n");            return;    }          URL = docPtr->URL;    if (NULL == URL) {      fprintf(stderr, "Failed to obtain URL\n");          }     if (ret != 0) {      fprintf(stderr, "%s: Failed to parse\n", URL);      return;    }     printf("%s: Processed ok\n", (const char *)URL);} int main(int argc, char **argv) {    xmlTextReaderPtr readerPtr;    int i;    xmlDocPtr docPtr;     if (argc < 2)        return(1);     /*     * this initialises the library and check potential ABI mismatches     * between the version it was compiled for and the actual shared     * library used.     */    LIBXML_TEST_VERSION     /*     * Create a new reader for the first file and process the     * document.     */    readerPtr = xmlReaderForFile(argv[1], NULL, 0);    if (NULL == readerPtr) {      fprintf(stderr, "%s: failed to create reader\n", argv[1]);            return(1);    }    processDoc(readerPtr);     /*     * The reader can be reused for subsequent files.     */    for (i=2; i < argc; ++i) {      	xmlReaderNewFile(readerPtr, argv[i], NULL, 0);	if (NULL == readerPtr) {	  fprintf(stderr, "%s: failed to create reader\n", argv[i]);      	  return(1);	}        processDoc(readerPtr);    }     /*     * Since we've called xmlTextReaderCurrentDoc, we now have to     * clean up after ourselves.  We only have to do this the last     * time, because xmlReaderNewFile calls xmlCtxtReset which takes     * care of it.     */    docPtr = xmlTextReaderCurrentDoc(readerPtr);    if (docPtr != NULL)      xmlFreeDoc(docPtr);     /*     * Clean up the reader.     */    xmlFreeTextReader(readerPtr);     /*     * Cleanup function for the XML library.     */    xmlCleanupParser();    /*     * this is to debug memory for regression tests     */    xmlMemoryDump();    return(0);} #elseint main(void) {    fprintf(stderr, "xmlReader support not compiled in\n");    exit(1);}#endif