Experimental Physics and
Industrial Control System

"Kasemir, Kay" <[email protected]> · Fri, 18 Sep 2009 08:54:11 -0400

Hi:

JCA/CAJ is very close to the original Channel Access
client library, so just as with it you have the choice between
a) Always get the enum as a DBR_STRING.
   "Works", gives you the string, but asks the IOC to
   produce the string when fetching the number would be a tiny bit
   more efficient. Besides, you might really want both the number
   and the state string.
b) Get the DBR_CTRL_ENUM once(!), which gives you the enum strings,
   then continue to just read the number.
   Seems perfect, because more efficient and now you have both
   number and string.
   But DBR_CTRL_ENUM  only gives you a maximum of 16 enums,
   while in fact there might be more options for certain enumerated values.
Your pick.

-Kay

On 9/18/09 01:16 , "David Brodrick" <[email protected]> wrote:

> Tech-talkers,
> I am using JCA/CAJ and I am wondering about the best way to determine
> the string representation of the current value for enumerated records
> such as bi, mbbi, etc.
> 
> Given the current numeric VAL, do I need to explicitly do an additional
> CA call to find out the appropriate string mapping (eg to find out the
> string for ONAM), or is there an easier way?
> Many thanks,
>   David
> 
> --
> ==========================================================
>  David Brodrick, Software Engineer
>  CSIRO Australia Telescope National Facility
>  Locked Bag 194, Narrabri, NSW 2390, Australia
>  Work: 02 6790 4038  Fax: 02 6790 4090
>  mailto:[email protected]
> ==========================================================
> 
> 
> 

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System