Re: [xml] quite huge memory consumption

[asma bouali <bouali asma gmail com>]

Hi,

 I would like to extract from information starting from a file XML to
use them afterwards in my program C with Visual studio 2008 Windows
XP. This file XML is voluminous.

I see that LibXml2 is a little difficult. Moreover, I do not find the
assistance.

- Can you give me an example of program C which use LibXml2 for
extract some information from  a file XML ?


there is somebody who says to me:
You do not need of library for parser XML: there are MSXML and other
SAX2 and the interfaces of the IXMLDocument kind in MSDN.

- Can you help me step by step on a small example of file XML in a
program C to understand how I will use MSXML ?



Thank you.

2009/7/24, Grzegorz JaÅkiewicz <gryzman gmail com>:
> Hi folks,
>
> I have a little XML file (13MB), containing 250 entries, scheduling
> information.
> Now, I am surprised to see, that xmlParseFile uses around 600MB to
> store information on that file.
>
> The way we parse it looks like that (pseudo code):
>
> xmlInitParser();
> doc = xmlParseFile(fn);
>
> context = xmlXPathNewContext(doc);
> s = xmlXPathEvalExpression(sTag, context);
> for(int j=0; j < s->nodesexyal->nodeNr; j++)
> {
>     if(NULL != s->nodesetval->nodeTab)
>     {
>       if(NULL!=(sNode = s->nodesetval->nodeTab[j]))
>        {
>
>           p = xmlGetProp(node, prop);
>              ...
>           xmlfree(p);
>
>           xmlDocSetRootElement(sDoc, sNode);
>           xy = xmlXPathEvalExpression(xyTag, context);
>
>            .........
>            r = xmlXPathEvalExpression(rTag, context);
>            ......
>            xmlXPathFreeObject(r);
>            xmlXPathFreeObject(xy);
>          }
>       }
> }
> xmlXPathFreeObject(s);
> xmlXPathFreeContext(context);
> xmlFreeDoc(sDoc);
> unlink(filename.c_str());
>
> xmlCleanupParser();
>
>
> so the memory consumption goes to 700 after xmlFileParse, and stays so
> high, even after xmlCleanupParser.
>
> any ideas ?
> it is libxml2-2.6.23-1 on centos 4.1 (and cannot change that).
>
>
> --
> GJ
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