X-ROUTED:	Wed, 24 Feb 1999 21:33:46 -0500
X-TCP-IDENTITY:	Ultima
Message-ID:	<36D4B5AB.E2B176F9@game-master.com>
Date:	Wed, 24 Feb 1999 21:30:05 -0500
From:	Kevin Lang/Ultima <ultima AT game-master DOT com>
Organization:	StormTech SoftWare
X-Mailer:	Mozilla 4.05 [en] (Win95; I)
MIME-Version:	1.0
To:	djgpp AT delorie DOT com
Subject:	Re: Help
References:	<36D162CB DOT E5B730A6 AT game-master DOT com> <36D2009E DOT E256EFBD AT cartsys DOT com> <36D46320 DOT 114420E4 AT game-master DOT com> <36D49611 DOT BF29AF33 AT cartsys DOT com>
Reply-To:	djgpp AT delorie DOT com

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Nate Eldredge wrote:

> Kevin Lang/Ultima wrote:
> >
> > Nate Eldredge wrote:
> >
> > > iso_map->tile_map[((iy<<(iso_map->ysize))+ix)].attributes
> > >
> > > Actually, it's quite simple.  You can see that TILE.attributes is indeed
> > > an `int', so the compiler is quite justified.
> > >
> > > I assume what you want to do is read the contents of the `attributes'
> > > member from the packfile.  `pack_fread' wants its first arg to be a
> > > pointer to the buffer into which to read.  Therefore, all you need to do
> > > is take the address of this horrible expression (with the `&' operator)
> > > and pass that.
> >
> > Yes I sortof figured this out a little while after :-)But  I don't get why I should use the .
> > operator instead of ->
> >
> > You are supposed to use -> when you are using a pointer to a struct right?
> > But tile_map is also a pointer to a struct, so how come the compiler wants me to put a . instead
> > of ->
>
> `tile_map' is a pointer, correct.  However, `tile_map[nnn]' is not; it
> is one of the elements of `tile_map', which is an array.  Each of these
> elements *is* a struct and not a pointer.
>
> It may help to know that `p[x]' is equivalent to `*(p+x)'.

Ah I understand now :-)

Thanks for the information!

> --
>
> Nate Eldredge
> nate AT cartsys DOT com



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