Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Thu, 26 Feb 2009 15:24:28 -0600

On Thursday 26 February 2009 13:57:56 Carl Schumann wrote:
>
> I am using the command-line caget with an array of space-containing
> strings.  Apparently caget uses spaces to separate array elements.   A
> space separator causes some difficultly in this case because the
> elements themselves contains spaces.   For example, ...
>
> > clx39:~ $ caget -# 1 ADC00.RNGS
> > ADC00.RNGS                     50, 10k: -10->0
> > clx39:~ $ caget ADC00.RNGS
> > ADC00.RNGS 9 50, 10k: -10->0 50, 10k: +-5 50, 10k: 0->10 50: -6->0,
> > 10k: -5->0 50: +-3, 10k: +-2.5 50, 10k: 0->5 50: -5->0, 10k: -2->0 50:
> > +-2.5, 10k: +-1 50: 0->5, 10k: 0->2
> > clx39:~ $
>
> One can ask for specific elements as I have done, but that is a little
> bit inconvenient.  Any suggestions?

The tools caget caput and camonitor are really designed for human consumption.  
If you're writing scripts that make more than a few calls (especially if they 
are long-running or involve looping) you should consider switching to a 
scripting language that has a direct interface to the CA library.  There are 
several Python interfaces available, and a Perl library comes with Base 
R3.14.10 (look at base/html/CA.html for documentation).  These will all allow 
you to fetch arrays the way you want them, and they can help reduce the load 
on your IOCs when compared with scripts that repeatedly run the command-line 
tools.

- Andrew
-- 
The best FOSS code is written to be read by other humans -- Harold Welte

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System