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Re: Read Zipped files [message #49918 is a reply to message #49917]

Tue, 29 August 2006 13:52

mchinand
Messages: 66
Registered: September 1996

Member

In article <1156870907.629435.73050@i3g2000cwc.googlegroups.com>,
loknath <ladhikari@gmail.com> wrote:
> Hi,
> I have huge satellite data stored in zipped files and unzipping would
> be costly for my hard drive. Is there a way IDL can unzip these files
> and read or read these files without unzipping in the hard drive.
> Thanks
>

I'm not sure if this is the best way to do this, but on Linux (and other Unix
flavors?) you could use named pipes:

from the shell prompt (only has to be done once):

> mkfifo pipe_filename

then in IDL for each file you want to unzip and read (filename is a string
variable with containing the filename of zipped file you want to read):

spawn,'unzip -p '+filename+' >pipe_filename&'

<insert read commands here, using pipe_filename as if it were a regular file
containing your unzipped data>

If your files used gzip compression instead, you could just use the /COMPRESS
option for OPENR.

I don't think any of this would work in Windows but probably in OS X. Didn't
someone have a Windows DLM that supported zipped files?

Good luck,

--Mike

--
Michael Chinander, PhD
m-chinander@uchicago.edu
Department of Radiology
University of Chicago

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[Message index]

		Re: Read Zipped files By: loknath on Wed, 30 August 2006 14:36
		Re: Read Zipped files By: Haje Korth on Wed, 30 August 2006 04:51
		Re: Read Zipped files By: Mike Wallace on Tue, 29 August 2006 21:05
		Re: Read Zipped files By: mchinand on Tue, 29 August 2006 13:52
		Re: Read Zipped files By: Haje Korth on Thu, 31 August 2006 05:13

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