Path: utzoo!attcan!telly!lethe!yunexus!ists!helios.physics.utoronto.ca!news-server.csri.toronto.edu!bonnie.concordia.ca!uunet!mcsun!corton!irisa!boissier
From: boissier@irisa.fr (franck boissiere)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Import Binary Date File from PC
Message-ID: <1991Feb6.102550.10982@irisa.fr>
Date: 6 Feb 91 10:25:50 GMT
References: <21958@duke.cs.duke.edu>
Sender: news@irisa.fr
Organization: IRISA, Rennes (FR)
Lines: 43

From article <21958@duke.cs.duke.edu>, by fang@physics.phy.duke.edu (Fang Zhong):
> 
> 	I use a PC to automate my experiment. I store my data on the PC in
> binary format as:
> 
> 
>>	fp = fopen(filename, "ab"); 
>>		fwrite(&data, sizeof(float), 1,fp); 
>>	fclose(fp);
> 
> I can use:
> 
>>	fread(&data, sizeof(float), 1, fp);
> 
> to read the data back on PC.  I plot my data with Igor on Mac. However, if
> I use the same line
> 
>>	fread(&data, sizeof(float), 1, fp);
> 
> to read the data on Mac after the data has been imported via "default
> translation" of Apple File Exchange, I get garbage.  The same is true when
> I generate binary data on Mac and read it back on PC.  This problem exits
> regardless which mode I use in AFE.

AFE only knows about file structured following a format. For text files
it will map end of lines accordingly for Microsoft Word files it will
convert between several other text processing formats.

In your case how to you want AFE to know that this particular file
contains floats written on a PC and convert them into the proper Mac
format?

Your problem is that the byte storage of multibyte data is not the same 
on 80x86 (PC processors) and 680x0 (Mac Processors), the swab() routine
included in most C libraries will do the job for you.



-- 
Franck BOISSIERE                        boissier@irisa.irisa.fr
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