Sorry, again this was meant to be CC'd to the list.
From: Andrew Johnson [mailto:[email protected]]
> On Thursday 01 October 2009 05:16:53 Michael Abbott wrote:
> > 3. What happens if I ask for a PV name ending in $ on a pre
> 14.11 server?
> > In particular, can I safely just hard-wire the special "ends with $ turns
> > into a string" treatment, or is this going to cause backwards
> > compatibility pain?
>
> Please do *not* look at the PV name in your code, there may
> be other field modifiers in the future that will also
> generate a string as a DBF_CHAR array, and existing
> applications already use waveform records to store long text
> strings (MEDM and EDM have both supported this for many years).
>
> You need to decide how to handle the data based on ca_field_type(),
> ca_element_count() and whether the application is looking for
> a string or an array of numbers. Unfortunately the last part
> is essential, only the application developer knows whether the
> aSub.VALA field is supposed to hold a printable string or a pixel array.
Huh. I think you're not going to like my Python channel access solution then.
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