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Re: reading gziped CDFs [message #34256 is a reply to message #34120]

Thu, 27 February 2003 09:26

Rick Towler
Messages: 821
Registered: August 1998

Senior Member

"erikb" wrote ...

> I have gziped CDF files that I would like to open without having to
> manually unzip them for space considerations. I know that IDL can
> handle opening gziped files with the /compress keyword to the open
> routines, but that doesn't help with a CDF. I see that my ver. of IDL
> (5.4) has a CDF_compression command, but it seems that this is an
> internal compression method within the CDF structure.

> So... is there a way to get IDL to understand that I have
> a gzipped CDF?

No.

> I'm thinking I need to kludge CDF_open somehow.

Since (net)CDF functionality is provided via .dlms your ability to kludge
anything will be rather limited unless you roll your own.

I think your only option is the unzip -> use -> zip approach you have
already thought of. Ken suggested using mktemp() to create unique file
names although that is a C library function and isn't native to IDL. An
alternative would be to use the last 8 or so digits of systime(/seconds) to
create your filename. This approach has limits (you only get 1 unique name
per second) but I think it would be fine for what you want to do.

-Rick

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[Message index]

		reading gziped CDFs By: erikb on Wed, 26 February 2003 20:50
		Re: reading gziped CDFs By: K. Bowman on Thu, 27 February 2003 10:43
		Re: reading gziped CDFs By: Mark Hadfield on Thu, 27 February 2003 10:40
		Re: reading gziped CDFs By: Rick Towler on Thu, 27 February 2003 09:26
		Re: reading gziped CDFs By: Kenneth P. Bowman on Thu, 27 February 2003 04:22

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