From:	Martin Ambuhl <mambuhl AT earthlink DOT net>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: fseek()/ fread() troubles
Date:	Sun, 02 May 1999 20:33:42 -0400
References:	<7gikpt$k2i$1 AT nnrp1 DOT dejanews DOT com>
X-Posted-Path-Was:	not-for-mail
X-Accept-Language:	en
X-ELN-Date:	3 May 1999 00:32:42 GMT
X-ELN-Insert-Date:	Sun May 2 17:35:19 1999
Organization:	Nocturnal Aviation
Lines:	40
Mime-Version:	1.0
NNTP-Posting-Host:	1cust124.tnt11.nyc3.da.uu.net
Message-ID:	<372CEEE6.1B3F3A85@earthlink.net>
X-Mailer:	Mozilla 4.51 [en] (Win95; I)
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

benvg AT hotpop DOT com wrote:
> 
> I've been trying to use fseek and fread to do some file i/o but weird things
> are happening. I can't seem to figure it out so I wrote this short program,
> and maybe someone can help me out.

Kill the magic numbers and call fseek correctly:

[ ... ]
#if 0
        write(fileno(fp), &data, 20);
#endif
        fwrite(&data, sizeof(STRUCTURE), 1, fp);   /* mha */
        data.number++;
    }
[ ... ]    
#if 0
        fseek_ret = fseek(fp, SEEK_SET, rand_num * 20);
#endif        
        fseek_ret = fseek(fp,rand_num * sizeof(STRUCTURE), SEEK_SET);
        ftell_ret = ftell(fp);

#if 0
        fread(&data, 20, 1, fp);
#endif        
        fread(&data, sizeof(STRUCTURE), 1, fp);
[ ... ]






/* vi: set cindent ts=4 sw=4 et tw=72: */



-- 
Martin Ambuhl (mambuhl AT earthlink DOT net)
Note: mambuhl AT tiac DOT net will soon be inactive

- Raw text -