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Re: Fortran unformatted data: Big or little endian [message #34947 is a reply to message #34946]

Wed, 30 April 2003 13:31

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Mark Hadfield (m.hadfield@niwa.co.nz) writes:

> If you have a reasonably recent version of IDL (>= 5.4??) and you know
> the byte-order of the machine on which you're *reading* the data then
> you can use OPEN's SWAP_IF_BIG_ENDIAN or SWAP_IF_LITTLE_ENDIAN
> keywords. Here's the documentation entry for the former:
>
> SWAP_IF_BIG_ENDIAN
>
> Setting this keyword is equivalent to setting SWAP_ENDIAN; it only
> takes effect if the current system has big endian byte
> ordering. This keyword does not refer to the byte ordering of the
> input data, but to the computer hardware.

The problem seems to be that the guy doesn't know
the ordering of the INPUT data. Like always, if you
don't know what it is you are reading, you are in
for a bit of bother (to paraphrase Whinnie the Pooh).

Maybe he will get lucky. It happens. :-)

Cheers,

David

--
David W. Fanning, Ph.D.
Fanning Software Consulting, Inc.
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155

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[Message index]

		Re: Fortran unformatted data: Big or little endian By: David Fanning on Sun, 04 May 2003 16:17
		Re: Fortran unformatted data: Big or little endian By: Mark Hadfield on Sun, 04 May 2003 15:07
		Re: Fortran unformatted data: Big or little endian By: David Fanning on Fri, 02 May 2003 16:26
		Re: Fortran unformatted data: Big or little endian By: btt on Fri, 02 May 2003 09:54
		Re: Fortran unformatted data: Big or little endian By: Dick Jackson on Fri, 02 May 2003 09:24
		Re: Fortran unformatted data: Big or little endian By: David Fanning on Wed, 30 April 2003 14:42
		Re: Fortran unformatted data: Big or little endian By: Mark Hadfield on Wed, 30 April 2003 13:52
		Re: Fortran unformatted data: Big or little endian By: David Fanning on Wed, 30 April 2003 13:31
		Re: Fortran unformatted data: Big or little endian By: Mark Hadfield on Wed, 30 April 2003 13:13
		Re: Fortran unformatted data: Big or little endian By: thompson on Wed, 30 April 2003 08:05
		Re: Fortran unformatted data: Big or little endian By: Paul Van Delst[1] on Wed, 30 April 2003 07:48
		Re: Fortran unformatted data: Big or little endian By: David Fanning on Wed, 30 April 2003 06:39
		Re: Fortran unformatted data: Big or little endian By: Michael Schroeter on Wed, 30 April 2003 06:30
		Re: Fortran unformatted data: Big or little endian By: David Fanning on Wed, 30 April 2003 05:55
		Re: Fortran unformatted data: Big or little endian By: Michael Schroeter on Mon, 05 May 2003 02:35
		Re: Fortran unformatted data: Big or little endian By: btt on Mon, 05 May 2003 07:07

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