Re: CInternetSession::OpenURL and Seek, Read

From:

"AliR $VC++ MVP$" <AliR@online.nospam>

Newsgroups:

microsoft.public.vc.mfc

Date:

Thu, 15 May 2008 14:13:21 -0500

Message-ID:

<RW%Wj.129$mh5.42@nlpi067.nbdc.sbc.com>

I'm not an expert on WinINet (CInternetSession is a wrapper for WinINet),
but I think that it keeps the data in an internal buffer, disk or memory
until you read it, take a look at InternetReadFile and
InternetSetFilePointer. In the background it also caches the file just like
a web browser would.

Anyway you might get more intelligent answers if you post to a WinINet group
or something similar.

AliR.

"Jeff" <someone@somewhere.com> wrote in message
news:oGZWj.8612$sv3.7216@newsfe13.ams2...

Hello

Does anyone know the details of what goes on behind the scenes when I open
a URL with CInternetSession::OpenURL and then do a Seek( ) and a Read( )
on the returned file pointer?

I'm guessing that the class just downloads and caches the entire URL and
then seeks and reads into a local file on my hard drive. It would be nice
though if it actually just downloaded the specified bytes - I believe HTTP
allows for that with a byte-range parameter doesn't it?

Thanks
Jeff