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Re: Defining constants in IDL? [message #31314 is a reply to message #31307]

Sat, 22 June 2002 09:55

ronn
Messages: 123
Registered: April 1999

Senior Member

in article af0nid$1ets$1@agate.berkeley.edu, Marshall Perrin at
mperrin+news@arkham.berkeley.edu wrote on 6/21/02 10:31 PM:

> Dominic Zarro <dzarro@yahoo.com> wrote:
>> IDL is very forgiving. Just define a constant to be any name and set its
>> value. For example,
>>
>> IDL> a = 100
>>
>> Just be careful not to redefine and, hence, overwrite the variable 'a'.
>
> The problem with this approach is that it is only visible within one
> particular file. There's no mechanism akin to C's header files for
> getting a constant into multiple source files, something I frequently find
> myself missing.

Hi Marshall,

Actually there is something similiar to including a header file. What you
need is a file with no header (i.e. pro or function as the first line) and
no end statement. For example,

a = 0
True = 1
False = 0
yes = 'YES'

could be saved in a file called constants.pro.

To include this in your own code you would do this.

pro myProcedure, p1, p2

@constants

...
...

end

The @ sign acts as an include statement to the compiler.

-Ronn

--
Ronn Kling
KRS, inc.
email: ronn@rlkling.com
"Application Development with IDL"ï¿½ programming book updated for IDL5.5!
"Calling C from IDL, Using DLM's to extend your IDL code"
http://www.rlkling.com/

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[Message index]

		Re: Defining constants in IDL? By: thompson on Thu, 27 June 2002 15:51
		Re: Defining constants in IDL? By: jeyadev on Tue, 25 June 2002 10:37
		Re: Defining constants in IDL? By: R.Bauer on Mon, 24 June 2002 06:43
		Re: Defining constants in IDL? By: Robert Stockwell on Mon, 24 June 2002 06:04
		Re: Defining constants in IDL? By: ronn on Sat, 22 June 2002 09:55
		Re: Defining constants in IDL? By: mperrin+news on Fri, 21 June 2002 19:31
		Re: Defining constants in IDL? By: Dominic Zarro on Fri, 21 June 2002 19:18
		Re: Defining constants in IDL? By: jeyadev on Fri, 28 June 2002 15:51

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