Date: Mon, 3 Nov 1997 17:38:16 -0800 (PST)
Message-Id: <199711040138.RAA10984@adit.ap.net>
Mime-Version: 1.0
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To: Oon Lin <Oon DOT Lin AT jcu DOT edu DOT au>, djgpp AT delorie DOT com
From: Nate Eldredge <eldredge AT ap DOT net>
Subject: Re: getc() and getw()
Precedence: bulk

At 05:06  11/3/1997 +1000, Oon Lin wrote:
>Hi..
>
>I'm having problem trying to use getc() and getw() to work..
>
>I have the code to read in the header of a PCX file and put them into a
>structure
>
>But when I use getw() to read in the width and height field I get a zero
>instead of the value that I'm expecting...
I'm afraid I don't have the time to read all your code, but IIRC those
fields of a PCX header are 16-bit values. getw() reads an `int', which is 32
bits for DJGPP. It's usually a bad idea to use such compiler-dependent
functions. Try `fread' into a `short' with size==2 instead.
>
>And when I use getc() to actually get the all the RLE data (through
>using a loop) I get either zero or inconsistent values everytime I run
>the program...
That I don't know about, unless it's caused by the getw()'s leaving you at
the wrong place in the file.
>
>Hmm.. could this be caused GCC's buffered input / output ?? I had set
>the buffer to NULL using setbuf() and even packed the structures (I
>doubt it's this problem..) but I still can't get the data corerctly...
The buffering won't affect it at all, and packing the struct will only make
a difference if you fread() directly into it, which it seems you don't.

>Everything is fine when I use Turbo C 2.0 but not GCC (DJGPP 2.0)
That would support my theory of the getw() problem.

Nate Eldredge
eldredge AT ap DOT net