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Re: point_lun [message #19122 is a reply to message #19032]

Wed, 23 February 2000 00:00

John-David T. Smith is currently offline

John-David T. Smith
Messages: 384
Registered: January 2000

Senior Member

Craig Markwardt wrote:
>
> "R.Bauer" <R.Bauer@fz-juelich.de> writes:
>>
>> I have recognized today point_lun makes differences between files
>> written on UNIX or DOS
>> for following idl version.
>
> This almost certainly has something to do with the difference between
> end-of-line conventions in Unix and Windows worlds. I believe that
> windows/DOS uses a CR/LF while Unix simply uses an LF.
>
> I don't understand *exactly* what is going wrong though, but it seems
> that Windows may be assuming that a CR/LF pair are present in your
> Unix file when only one of them is there. What's wierd is that it's
> using that information in the POINT_LUN call. This may not be a bug
> in IDL but rather in the Windows library that IDL uses. The Microsoft
> people probably don't even consider it a bug but a feature...
>
> There are converters that can do the Unix<->DOS conversion for you,
> but unfortunately it's an extra ugly step.
>

It depends on how it was written. Even DOS C programs will happily convert each
newline in your output to a carraige return/newline pair, unless told not to
with some kind of BINARY mode. All formatted windows/dos output will reflect
this conversion, unless it is somehow disabled. Many FTP programs will do this
to, for example (unless in binary mode).

JD

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J.D. Smith |*| WORK: (607) 255-5842
Cornell University Dept. of Astronomy |*| (607) 255-6263
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Ithaca, NY 14853 |*|

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[Message index]

		point_lun By: R.Bauer on Wed, 23 February 2000 00:00
		Re: point_lun By: Martin Schultz on Fri, 25 February 2000 00:00
		Re: point_lun By: John-David T. Smith on Wed, 23 February 2000 00:00
		Re: point_lun By: Craig Markwardt on Wed, 23 February 2000 00:00
		Re: point_lun By: John-David T. Smith on Tue, 29 February 2000 00:00

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