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Re: Determining machine endian-ness [message #12136 is a reply to message #12129]

Thu, 02 July 1998 00:00

Kelly Dean
Messages: 92
Registered: March 1997

Member

I check a value in my data that is normally constant. If this value is too big, I
byte-swap.

With IDL 4.0+, !VERSION tells you if your operating system is UNIX or WIN32. I
would use this to determine if I need to byte-swap on some occassions. However,
some people that use my stuff still are using IDL 3.6 - so I stick with checking a
number in the data for most of the IDL code I share.

Kelly

Mark Rivers wrote:

> Is there a way to determine whether the machine on which IDL is executing is
> big endian or little endian? I am trying to read a data file which I know
> contains little-endian data. I need to byte swap this data if IDL is running
> on a big-endian machine, but not byte-swap if it is running on a little-endian
> machine.
>
> It would be nice there were a field in !VERSION which contained this
> information. Right now I am testing if !VERSION.ARCH eq 'x26', 'alpha', etc.
> There must be a better way.
>
> ____________________________________________________________
> Mark Rivers (773) 702-2279 (office)
> CARS (773) 702-9951 (secretary)
> Univ. of Chicago (773) 702-5454 (FAX)
> 5640 S. Ellis Ave. (708) 922-0499 (home)
> Chicago, IL 60637 rivers@cars.uchicago.edu (e-mail)
>
> or:
> Argonne National Laboratory (630) 252-0422 (office)
> Building 434A (630) 252-0405 (lab)
> 9700 South Cass Avenue (630) 252-1713 (beamline)
> Argonne, IL 60439 (630) 252-0443 (FAX)

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[Message index]

		Re: Determining machine endian-ness By: callen on Thu, 02 July 1998 00:00
		Re: Determining machine endian-ness By: Kelly Dean on Thu, 02 July 1998 00:00
		Re: Determining machine endian-ness By: pit on Thu, 02 July 1998 00:00
		Re: Determining machine endian-ness By: menakkis on Thu, 02 July 1998 00:00
		Re: Determining machine endian-ness By: davidf on Wed, 01 July 1998 00:00
		Re: Determining machine endian-ness By: mallors on Wed, 01 July 1998 00:00

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