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Re: Read Zipped files [message #49917 is a reply to message #49915]

Tue, 29 August 2006 21:05

Mike Wallace
Messages: 25
Registered: May 2006

Junior Member

> 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?

You're right. Windows doesn't have the same concept of named pipes that
*nix does, and due to OS X being rooted in BSD, it should support named
pipes.

As for the original question, if you're using gzip to compress the
files, IDL can read them by using the /COMPRESS flag to the OPENR, OPENU
or OPENW commands.

If you're files are zip files, the only option I know of is to unzip the
file before you use it. If you are using *nix, you can use the named
pipe approach as the file would be unzipped into memory rather than to
the hard drive. If you're using Windows, the only option I can think of
is to write a small program in another language that could handle the
unzip and stream the results out to shared memory. You'd then have to
make your IDL program read from shared memory instead of the file. It's
not the easiest thing in the world if you've never worked with shared
memory before.

When you said that it would "be costly for my hard drive," what do you
mean? Are you referring to all the files that would have to be written
back out to disk all the time or are you concerned with running out of
disk space?

-Mike

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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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