I don't think you can do this with standard c++. Or if you can, you may need third party libraries. A quick search suggests going with the microsoft windows option would seem the easiest.

[search]c++ read webpage[/search]
http://www.daniweb.com/forums/thread50205.html
Look at the msdn website and the documentation for wininet perhaps?

using libcurl would be a portable way. http://curl.haxx.se/libcurl
source or binaries for a number of platforms are available http://curl.haxx.se/download.html

libcurl can be used directly from c++. curlpp gives a c++ wrapper that uses stl, is exception and type safe; so you may want to use it.
http://rrette.com/textpattern/index.php?s=cURLpp
http://rrette.com/textpattern/index....download&id=35

you could also use curl from the command line.
to retriev a number of web pages (eg. to mirror a complete website), use wget
http://www.gnu.org/software/wget/
for windows: http://www.christopherlewis.com/WGet/WGetFiles.htm