Re: Need Help about MSXML , LoadXML

From:

=?Utf-8?B?c2FjaGlu?= <sachin@discussions.microsoft.com>

Newsgroups:

microsoft.public.vc.language

Date:

Mon, 23 Mar 2009 23:24:01 -0700

Message-ID:

<E81BAAAA-33D2-45A8-9D9B-7FEAB3A7BB06@microsoft.com>

I have one more question in this context.
After processing certain amount of Document i am receiving error
"Not enough storage available to complete operation" For LoadXML Method

The program flow goes like this

1. I have a class CXmlWriter which initialise the IXMLDOMDOCUMENT in
constructor

2. the same class has a method UpdateDOM() which refer the IXMLDOMDocument
created in Constructor

void UpdateDom(string xmldata)
{
        VARIANT_BOOL whatisresult;

    BSTR bstr_XMLContent = SysAllocString(xmldata);

    HRESULT hr = pXMLDom->loadXML( bstr_XMLContent, &whatisresult);

      // code to Iterate inside the DOM and update few node

    // code to cleanup
}

and UpdateDom is in a loop and is called quite a many times
after processing say 70 to 80K documents LoadXML returns
"Not enough storage available to complete operation" error ..

What could be the possible cause.

cant we use LoadXML so much time on the same interface of IXMLDOMDocument ?

Wiill it be good idea to create and delete IXMLDOMDOCUMENT every time i
come inside UpdateDom function ?

Or should i release IXMLDOMDOCUMENT interface after getting such error build
it again ?

}

"Sachin" wrote:

i think i doesnt have much impact
"Carl Daniel [VC++ MVP]" wrote:

Sachin wrote:

will CoFreeUnusedLibraries() work ?

Why don't you try it and find out.

-cd

"Carl Daniel [VC++ MVP]" wrote:

Sachin wrote:

can we explicitly free it ?

Only by forcing the MSXML DLL to be unloaded from your process. Not
even releasing all interface refereces will force a GC, if I recall
correctly.

-cd

"Carl Daniel [VC++ MVP]" wrote:

Sachin wrote:

i am using MSXML to load a string as XML DOM object
so i use LoadXML method of IXMLDOMDocument
in my program i have to LoadXML several times in loop ,

i would like to if i repeat LoadXML call for Same interface
object would the earlier memory be freed ? On repeated call to
LoadXML the DOM is updated with new string content but will be
earlier memory be freed automatically ?

Yes, it will. MSXML uses an internal garbage collector so the
memory usage may grow but it will eventually be reclaimed.

-cd