Hi,
My apologies if this mailing list is not the intended target.
The version of libxml2 and the OS on which it is deployed is displayed
below.
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shell$ xml2-config --version
2.6.11
shell$ cat /proc/version
Linux version 2.6.9-1.667smp ([EMAIL PROTECTED]) (gcc
version 3.4.2 20041017 (Red Hat 3.4.2-6.fc3)) #1 SMP Tue Nov 2 14:59:52
EST 2004
-----------------------------------------------------------------------
I would like to know how to use streaming XPath. Googling on libxml2
about this shows favorable search results.
The usage scenario follows:
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//
//open an XML file for reading
FILE *xmlFile;
if ((xmlFile = fopen(argv[1] , "r")) == NULL)
{
...
}
//
// read a chunk/fragment of XML
// Evaluate an XPath on the chunk of XML
do
{
char buffer[BUFFER_SIZE];
int readlen = fread (buffer, 1, BUFFER_SIZE, xmlFile);
//
// Parse the XML fragment
xmlDocPtr doc = xmlSAXParseMemory(sax, buffer, BUFFER_SIZE, 0);
if (doc != NULL)
{
xmlXPathContextPtr xpathCtx = xmlXPathNewContext(doc);
xmlXPathObjectPtr xpathObj = xmlXPathEvalExpression(
xpathExpr, xpathCtx);
//
// Print the XPath results
xmlXPathFreeObject(xpathObj);
xmlXPathFreeContext(xpathCtx);
xmlFreeDoc(doc);
}
} while (not end of XML file);
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I understand that xmlSAXParseMemory needs a well-formed XML in-memory
buffer and not just a chunk.
For example, consider the XML
-----------------------------------------------------------------------
<foo>
<bar>This is a really long string: 123456789012345678901234567890
</bar>
</foo>
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The chunks could be
-----------------------------------------------------------------------
Chunk 1:
<foo>
<bar>This is a really long string: 1234567890
Chunk 2:
12345678901234567890</bar>
</foo>
-----------------------------------------------------------------------
Could you please tell me if streaming XPath is supported? If so, could
you please provide me a code sample that would parse a XML chunk and
evaluate XPaths on it.
Thanks much for your help.
Regards,
Ravi.
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