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Re: IDL Save Files: A Journey into Craig's World [message #38940 is a reply to message #38916]

Fri, 02 April 2004 21:58

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

Greetings!

Michael Wallace <mwallace.removethis@swri.edu.invalid> writes:
>
> What I'm interested in is an example of a save file which consists of a
> structure with multiple one-dimensional arrays. The arrays are the same
> size, but may be of different primitive data types (usually integers,
> sometimes floats, sometimes strings). I guess I'm trying to figure out
> how all the records line up and where everything falls for a complicated
> structure like this. I want to determine how easy it would be to create
> a save file such as this outside of IDL.

If you are looking for an example, then probably you could make an
example pretty easily with some sample data, right?

You can also easily use the mid- or low-level routines in my library
to create sample save files of any type you desire.

The variable-type descriptors are not full fledged records. What you
are really asking is how the descriptors appear within a single
variable's record. What you will find is that a structure descriptor
starts with a value of "9". Then, if the structure contains any
arrays or structures within itself, then descriptors for those follow,
first arrays, then structures. For your problem, you would see the
following byte stream:
STRUCT_DESCR (N tags, including M arrays)
ARRAY_DESCR (1)
...
ARRAY_DESCR (M)

After the first definition of a structure, any following structures of
the same data type refer back to the original instead of redefining it
again.

> By the way, do you (Craig) have plans to update the document for IDL 6.0?

Let's say that the implied legal threats against me by RSI and Kodak
have more or less cooled my interest in IDL save files.

Do you have any reason to believe that IDL 6 save file formats have
changed?

Craig

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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@REMOVEcow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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[Message index]

		Re: IDL Save Files: A Journey into Craig's World By: Craig Markwardt on Mon, 05 April 2004 09:43
		Re: IDL Save Files: A Journey into Craig's World By: Craig Markwardt on Mon, 05 April 2004 09:39
		Re: IDL Save Files: A Journey into Craig's World By: Paul Van Delst[1] on Mon, 05 April 2004 09:11
		Re: IDL Save Files: A Journey into Craig's World By: Michael Wallace on Mon, 05 April 2004 09:02
		Re: IDL Save Files: A Journey into Craig's World By: Craig Markwardt on Fri, 02 April 2004 21:58
		Re: IDL Save Files: A Journey into Craig's World By: p.sommer on Sun, 18 April 2004 19:26

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