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pointers in IDL [message #8813]

Mon, 28 April 1997 00:00

Christian Oehreneder is currently offline

Christian Oehreneder
Messages: 6
Registered: September 1995

Junior Member

Dear colleagues!

I need help on the following problem:

My application uses a not a priori known number of images with different
sizes, which I want to access easily and flexible, preferrably by
writing img_i = img(i) or something similar. Because of the different
sizes of the images this is not easily done in IDL.
In common programming lanuages it would be natural to have an array of
pointers to each of the images.
So far I have not found a possibilty to do this in IDL. Handles are nice
but they do not allow to have two pointers on the same data. The effect
is that once you take the value of a handle (without copying it of
course !!) the handle itself contains an undefined value. It is not
possible to have a list of images and pass them to some manipulation
routines by pointer, e.g. multiplying all images by a factor of 2. Of
course it is possible to take the value form the handle, multiply it and
set it as value of the handle, but that's rather cumbersome.

Has anyone an idea how to work arround this??

Thanks in advance

Christian Oehreneder
************************************************************ ************
Christian Oehreneder

Institute for Photogrammetry and Remote Sensing
Technical University Vienna

TU Wien, Institut 122 Tel.: +43 1 58801-3730
Gusshausstrasse 27-29 FAX: +43 1 5056268
A-1040 Wien Email: co@ipf.tuwien.ac.at
AUSTRIA ((coehrene@fbgeo1.tuwien.ac.at))
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[Message index]

		pointers in IDL By: Christian Oehreneder on Mon, 28 April 1997 00:00
		Re: Pointers By: Liam Gumley on Mon, 09 August 1999 00:00
		Re: Pointers By: davidf on Mon, 09 August 1999 00:00
		Re: Pointers in IDL By: Peter Clinch on Wed, 14 April 2004 07:55
		Re: Pointers in IDL By: JD Smith on Tue, 13 April 2004 18:08
		Re: Pointers in IDL By: Rick Towler on Tue, 13 April 2004 11:06
		Re: Pointers in IDL By: R.Bauer on Tue, 13 April 2004 10:37
		Re: Pointers in IDL By: Antonio Santiago on Tue, 13 April 2004 10:08

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