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Re: Pass Pointer through procedures [message #55256 is a reply to message #55255]

Thu, 09 August 2007 06:04

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

payon@gmx.de writes:

> what is the simpliest way to pass pointers through procedures? I
> couldn't find anything which exlpain it well. Ok, I read some
> different things a bout pointers and they weren't helpful.

You are reading the wrong things. Try this:

http://www.dfanning.com/misc_tips/pointers.html

Pointers are nothing more or less than IDL variables. While
it is true that the thing the pointer points to is stored
in a global memory location, the pointer itself is a local
variable and must be treated as such.

And you are also correct that if you are going to use Common
blocks, there is no advantage to pointers, unless the
thing you are pointing to will be changing in the course
of the IDL session.

The usual way to pass variables among procedures and functions
is via positional or keyword parameters.

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]

		Re: Pass Pointer through procedures By: payon on Thu, 09 August 2007 07:19
		Re: Pass Pointer through procedures By: payon on Thu, 09 August 2007 07:11
		Re: Pass Pointer through procedures By: David Fanning on Thu, 09 August 2007 06:04

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