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Re: Global Variable [message #26830 is a reply to message #19399]

Mon, 01 October 2001 08:33

Pavel A. Romashkin
Messages: 531
Registered: November 2000

Senior Member

Martin,
The following URL points to a tiny file that does what you want.
http://spot.colorado.edu/~romashki/idl/single_set.sav
You can see basic description by typing
SINGLE_SET, /HELP
To set a global variable, use
SINGLE_SET, 'The_Name', My_State[, /NO_COPY]
To read it, use
My_State = SINGLE_GET('The_Name'[, /NO_COPY])
To kill it:
SINGLE_KILL, 'The_Name'
There is no limit on the number of named global variables.
If you did not keep track of global pointers using GET_HANDLE then
HEAP_GC will be able to kill them, as they exist as dangling references.
In this case, call to SINGLE_GET will re-create the named global
variable, but, of course, not its contents.
However, they are accessible via SINGLE_GET at any time.
Cheers,
Pavel
Disclaimer: I do not support using global variables. Provided procedure was
only written as an alternative to using COMMON blocks for those rarest
cases when widget programs are absolutely independent but benefit from
being aware of each other.

Martin Downing wrote:
>
> Reimar,
>
> If this is to be a global variable, do you have a cunning method of locating
> and identifying this variable off the heap?
>
> Martin

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[Message index]

		Global variable vs common block By: marc schellens[1] on Thu, 16 March 2000 00:00
		Re: Global Variable By: Pavel A. Romashkin on Mon, 01 October 2001 08:33
		Re: Global Variable By: R.Bauer on Mon, 01 October 2001 05:04
		Re: Global Variable By: Martin Downing on Mon, 01 October 2001 04:14
		Re: Global Variable By: Miguel Ángel Córd on Mon, 01 October 2001 03:46
		Re: Global Variable By: R.Bauer on Mon, 01 October 2001 02:53
		Re: Global Variable By: Martin Downing on Mon, 01 October 2001 02:40

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