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Re: Reading Binary [message #49250 is a reply to message #4812]

Wed, 12 July 2006 07:21

Paul Van Delst[1]
Messages: 1157
Registered: April 2002

Senior Member

Dirk1106@googlemail.com wrote:
> for 12 bits
>
> fread(&t0, 3, 1, fp); byteswap(&t0,3);
> fread(&tof, 1, 1, fp);
> fread(&pos1, 2, 1, fp); byteswap(&pos1,2);
> fread(&pos2, 2, 1, fp); byteswap(&pos2,2);
> fread(&ang, 2, 1, fp); byteswap(&ang,2);
> fread(&e1, 1, 1, fp);
> fread(&e2, 1, 1, fp);
>
>
>
> for 13 bits.
>
> fread(&t, 8, 1, fp); byteswap(&t,8);
> fread(&pos, 2, 1, fp); byteswap(&pos,2);
> fread(&ang, 2, 1, fp); byteswap(&ang,2);
> fread(&e, 1, 1, fp);
>

I thought fread worked in units of (8-bit) bytes? My C reference double check confirmed
that also (from http://www.elook.org/programming/c/fread.html)

-------------
fread()

Syntax:

#include <stdio.h>
int fread( void *buffer, size_t size, size_t num, FILE *stream );

Description:
The function fread() reads num number of objects (where each object is size bytes) and
places them into the array pointed to by buffer. The data comes from the given input
stream. The return value of the function is the number of things read...use |feof()| or
|ferror()| to figure out if an error occurs.
-------------

paulv

--
Paul van Delst Ride lots.
CIMSS @ NOAA/NCEP/EMC Eddy Merckx
Ph: (301)763-8000 x7748
Fax:(301)763-8545

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[Message index]

		Reading binary data (written using XDR) into IDL?? By: khan on Wed, 09 August 1995 00:00
		Re: Reading Binary By: Peter Clinch on Wed, 12 July 2006 08:28
		Re: Reading Binary By: greg michael on Wed, 12 July 2006 07:25
		Re: Reading Binary By: Paul Van Delst[1] on Wed, 12 July 2006 07:21
		Re: Reading Binary By: Dirk1106@googlemail.c on Wed, 12 July 2006 07:13
		Re: Reading Binary By: Peter Clinch on Wed, 12 July 2006 06:30
		Re: Reading Binary By: Dirk1106@googlemail.c on Wed, 12 July 2006 06:01
		Re: Reading Binary By: greg michael on Wed, 12 July 2006 04:12
		Re: Reading Binary By: Peter Clinch on Wed, 12 July 2006 02:14
		Re: Reading Binary By: Dirk1106@googlemail.c on Wed, 12 July 2006 01:39
		Re: Reading Binary By: greg michael on Tue, 11 July 2006 05:43

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