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Re: Reading from process pipes in IDL? [message #21795 is a reply to message #21782]

Thu, 21 September 2000 00:00

George N. White III is currently offline

George N. White III
Messages: 56
Registered: September 2000

Member

On Thu, 21 Sep 2000, Benno Puetz wrote:

> I have been trying to read image data from compressed (*.gz) files.
>
> While this is possible with
>
> SPAWN, "gunzip "+file+".gz"
>
> OPENR, l, file, /GETLUN
>
> READU, ....
>
> FREE_LUN, l
>
> I would prefer a way similar to PERL's
>
> open(FILE, "gzip -cd $file |");
>
> ...
>
> since it would not have to decompress/compress to disk.
>
> Is this at all possible with IDL?
>
> --
> Benno Puetz
> Kernspintomographie
> Max-Planck-Institut f. Psychiatrie Tel.: +49-89-30622-413
> Kraepelinstr. 10 Fax : +49-89-30622-520
> 80804 Muenchen, Germany

If your system (OS/2, unix, ??) supports named pipes, you can use them for
this sort of problem, although I have never tried them with IDL. Use
"mknod pipename p" to create a named pipe, then start a background process
to stuff data into the pipe, (e.g., "gzcat file.gz > pipename & "). In
your program, "pipename" is read as if it was an ordinary file, except
that you can't do things like Fortran backspace or rewind, or memory
mapped I/O.

--
George N. White III <gnw3@acm.org> Bedford Institute of Oceanography

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[Message index]

		Re: Reading from process pipes in IDL? By: Craig Markwardt on Thu, 21 September 2000 00:00
		Re: Reading from process pipes in IDL? By: landsman on Thu, 21 September 2000 00:00
		Re: Reading from process pipes in IDL? By: Craig Markwardt on Thu, 21 September 2000 00:00
		Re: Reading from process pipes in IDL? By: gfirem1 on Thu, 21 September 2000 00:00
		Re: Reading from process pipes in IDL? By: George N. White III on Thu, 21 September 2000 00:00

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