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Re: VMS vs UNIX, unformatted binary files [message #3613 is a reply to message #3612]

Wed, 15 February 1995 15:09

chase
Messages: 62
Registered: May 1993

Member

>>>> > "Lars" == Lars Soeraas <lars@rapid.fi.uib.no> writes:
In article <3ht8pb$qsj@due.uninett.no> lars@rapid.fi.uib.no (Lars Soeraas) writes:

Lars> We are trying to read unformatted binary files in IDL on a
Lars> UNIX system (HP 9000, series 700). The files to be read have been
Lars> generated by IDL on a VAX VMS. The problem is that the bytes are
Lars> swapped and the files contain a mixture of lonint, int, floats
Lars> and character strings. We have an idl program to read the files
Lars> which works well on a VAX but returns garbage on the UNIX system.
Lars> Is there a simple way of avoiding this problem?

Use XDR format. This format is portable among versions of IDL running
on different machines. This is a special portable binary format that can be
read by other programs (e.g., C and PASCAL) on machines that have the
XDR library. See Chapter 17 of the IDL User Guide.

To use the XDR format, just add the /XDR keyword to your open
statements in IDL. It is that easy.

If you want to create XDR files with other programs for IDL to read,
there is an example in the User Guide. It is C program that creates
an XDR data file which is then easily read into IDL.

Chris
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chris.chase@jhuapl.edu

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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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