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Re: index arrays of structures [message #59301 is a reply to message #59229]

Mon, 17 March 2008 08:03

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Reimar Bauer writes:

> Have to say first that is not a solution for your current problem. But
> sometimes you like to know about this too
>
> You can directly read into pointers
> this examples assumes files of equal filesize (it reads now only one
> file, but you can use [i] for [0] )
>
> a={data:replicate(ptr_new(bytarr(20996)),4)}
> openr,lun,'example.bin',/get
> readu,lun,*(a.data)[0]
> free_lun,lun
>
> print, (*(a.data)[0])[0:10] ; prints the first bytes
>
> You can make the structure more complex if you have to read for example
> records of byte, float and other types. Then you have to define a
> structure with placeholders for these types. You can replicate this
> structure to the number of records. And then the whole file could be
> read at once.

With all due respect to Reimar, this is NOT the kind
of thing you should be laying on a guy who is struggling
to understand the basics of programming! Give the
guy a break. Simple, simple, simple. He can learn the
rest later. :-)

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		index arrays of structures By: raghuram on Sat, 15 March 2008 13:53
		Re: index arrays of structures By: raghuram on Mon, 17 March 2008 13:31
		Re: index arrays of structures By: R.G. Stockwell on Mon, 17 March 2008 10:57
		Re: index arrays of structures By: raghuram on Mon, 17 March 2008 09:29
		Re: index arrays of structures By: David Fanning on Mon, 17 March 2008 08:03
		Re: index arrays of structures By: R.Bauer on Mon, 17 March 2008 07:44
		Re: index arrays of structures By: Vince Hradil on Sun, 16 March 2008 12:29
		Re: index arrays of structures By: raghuram on Sun, 16 March 2008 12:19

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