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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);
/*
* Cleanup function for the XML library.
*/
xmlCleanupParser();
/*
* this is to debug memory for regression tests
*/
xmlMemoryDump();
return(0);
}
#else
int main(void) {
fprintf(stderr, "xmlReader support not compiled in\n");
exit(1);
}
#endif
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