> I'm trying to write a c code which will operate
> httrack from within.
> it will get parameters like web address, depth of
> search, files type to download and where to save the
> file and run the software without user
> interference.

The best way is to look at the src/httrack.c source code; this is the
commandline version of httrack, which is just a wrapper around the libraries.

Note: if you are using the HTTrack libraries, your code needs to be GPL, too
(http://www.gnu.org/licenses/gpl.txt)