RE: long strings in edm

[<peter.leicester@diamond.ac.uk>]

Thanks for the info.

Does anyone know which version of edm this was added too. It appears our 1-12-28 (Mar2010) edm version doesn't support it.

Pete

-----Original Message-----
From: Andrew Johnson [mailto:anj@aps.anl.gov]
Sent: 17 June 2011 18:13
To: tech-talk@aps.anl.gov
Cc: Leicester, Pete (DLSLtd,RAL,DIA)
Subject: Re: long strings in edm

Hi Pete,

On 2011-06-17 peter.leicester@diamond.ac.uk wrote:
> In epics 3.14.11 it is possible to caput a long string (> 40 characters)
>  using the following:
>
> caput -S mypv$ "some string that is longer than 40 characters"

Not quite; $ is a legal character in a record name, so to make this a long
strings the $ *must* follow the . in the PV name, i.e. you have to use mypv.$
or mypv.VAL$.  The $ field modifier only works for fields of type DBF_*LINK or
for DBF_STRING fields which have size(>40) in the record type's DBD file.

> Is there an equivalent for writing long strings from an edm (version
> 1-12-28) text control or similar widget?

Yes, when writing EDM John Sinclair copied MEDM's support for string I/O to a
PV whose native type is an array of chars (which is what the above field
modifier does).  Just point the regular EDM text widgets at a suitable PV.

> (In my particular case I want to write a long PV name into a DOL field)

You should be able to use this approach, mypv.DOL$

- Andrew
--
Optimization is the process of taking something that works and
replacing it with something that almost works, but costs less.
-- Roger Needham

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