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/** * 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 interesting * 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); return(0); } #else int main(void) { fprintf(stderr, "xmlReader support not compiled in\n"); return(0); } #endif