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IDL Spawn on Windows OS [message #81516] Fri, 28 September 2012 19:10
wlandsman is currently offline  wlandsman
Messages: 743
Registered: June 2000
Senior Member
I have a FITS file reader that can work with gzip compressed files. It can work much more efficiently if it can know how many bytes would be in the uncompressed file (without actually having to uncompress it.) For Unix/Mac systems I can parse the output of "gzip -l" captured with Spawn

IDL> spawn,'gzip -l 1904-66_HPX.fits.gz',output

and the 'output' variable will contain something like
' compressed uncompressed ratio uncompressed_name'
' 105515 161280 34.6% 1904-66_HPX.fits'

I am told that this will not work under Windows OS (with gzip installed), presumably because it does not know about a gzip command. Can anyone suggest a way to make this code Windows friendly? (I do not have access to IDL on a Windows machine). Thanks, --Wayne

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