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Re: VMS vs UNIX, unformatted binary files [message #3612 is a reply to message #3609]

Wed, 15 February 1995 19:29

rivers
Messages: 228
Registered: March 1991

Senior Member

In article <3ht8pb$qsj@due.uninett.no>, lars@rapid.fi.uib.no (Lars Soeraas) writes:
> We are trying to read unformatted binary files in IDL on a
> UNIX system (HP 9000, series 700). The files to be read have been
> generated by IDL on a VAX VMS. The problem is that the bytes are
> swapped and the files contain a mixture of lonint, int, floats
> and character strings. We have an idl program to read the files
> which works well on a VAX but returns garbage on the UNIX system.
> Is there a simple way of avoiding this problem?

You can swap the byte order in the "longs" and "ints" with BYTEORDER. However,
there are no built-in routines in IDL on the HP to convert VAX float to
IEEE float. The inverse routines do exist: you can convert VAX float to IEEE
float on tha VAX before writing the data to disk. Again, use the BYTEORDER
routine. If the data are only to be read by IDL the simplest thing to do
is SAVE, /XDR which saves the variables in the portable XDR format.
____________________________________________________________
Mark Rivers (312) 702-2279 (office)
CARS (312) 702-9951 (secretary)
Univ. of Chicago (312) 702-5454 (FAX)
5640 S. Ellis Ave. (708) 922-0499 (home)
Chicago, IL 60637 rivers@cars3.uchicago.edu (Internet)

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[Message index]

		Re: VMS vs UNIX, unformatted binary files By: lars on Mon, 20 February 1995 03:55
		Re: VMS vs UNIX, unformatted binary files By: thompson on Fri, 17 February 1995 07:25
		Re: VMS vs UNIX, unformatted binary files By: ryba on Thu, 16 February 1995 06:52
		Re: VMS vs UNIX, unformatted binary files By: rivers on Wed, 15 February 1995 19:29
		Re: VMS vs UNIX, unformatted binary files By: chase on Wed, 15 February 1995 15:09

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