🚀 go-pugleaf

Adam wrote:
> 
> When you say "portable" most systems have wininet.dll installed.

I just checked my Linux installation and hey, what do you know, it's not
there. In comp.programming (which is where I'm reading this), "portable"
means more than just "portable to Windows".

> It is part
> of the OS in Win '98 and >. But for users with Win '95 - all they need is IE
> 4 or >.

<shrug>

> "justin chan" <jayc@start.com.au> wrote in message
> news:16379a2c.0109251629.5566caa3@posting.google.com...
> > Hi,
> >
> > Currently I'm using 'InternetCombineURL' function from WinInet to
> > combine a base and relative URL into a single URL.
> > eg. Base: http://www.myserver.com/folder/
> >     Relative: ../file.html
> >     Result: http://www.myserver.com/file.html
> >
> > However, because I want to make my application portable, I'm removing
> > dependencies on WinInet.

Excellent.

> >
> > Does anyone know if there is an alternative to 'InternetCombineURL'
> > and does not rely on WinInet??

Yes, Justin, it's called "programming".  :-)

Start off with your base URL. Parse on the / character. This gives you
tokens http: (in your example), www.myserver.com, and folder.

Build a data structure that represents that relationship:

      www.myserver.com
            ^
            |
            |
            |
            V
          folder

This rather simple example doesn't explain things very well, but
basically you'd have each node pointing to an array of child nodes and
also to a parent node (with the server node itself having a parent of
NULL). That would enable you to build up a picture of the server as you
go.

Anyway, from that start, finding a relative path is trivial. Start at
the "current" directory - in your case, www.myserver.com/folder - and
parse, again on the / character. If you hit a . on its own, you can
discard it. If you hit on .. on their own, you need to go one place
nearer the root. If you hit a token terminated by a /, you need to
change into that directory (possibly creating a new node in your data
structure in order to represent it), and if you hit a non-empty token
not ending in / at the end, that's the file you're after.

It's really relatively simple, but also relatively interesting, and well
worth the exercise of programming for yourself.


-- 
Richard Heathfield : binary@eton.powernet.co.uk
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