Experimental Physics and
Industrial Control System

Michael Davidsaver via Tech-talk <[email protected]> · Thu, 19 Dec 2019 12:21:21 -0800

Hi Pierrick,

You question contain a lot of unfamiliar jargon.  "aSub" is reasonably
clear to me, but "v7Struct" could be referring to several possible
C++ classes.  It would be clearer if you could use literal C/C++
type names (eg. 'aSubRecord' or 'PVStructure').

Also, FYI.

http://epics-base.github.io/pvDataCPP/

http://epics-base.github.io/pvAccessCPP/

Specifically, I recommend looking at pvac::ClientProvider instead of PvaClient
and pvas::SharedPV instead of PVDatabase.

Example can be found in: https://github.com/epics-base/pvAccessCPP/tree/master/examples

On 12/18/19 1:51 PM, Pierrick M Hanlet via Tech-talk wrote:
> Hi all,
> I am developing a module for use at Fermilab which allows an easy interface
> from EPICS IOCs to our native control system.  I want to use aSub records
> so that I have the flat db files which can be populated with macros.  
> Within
> my module I've created a structure, v7Struct which carries all of the 
> pertinent
> information; e.g. Reading and Setting.  At initialization, I instantiate 
> as many
> of these objects (v7Structs) as I need.
> 
> So, to read from my v3 PVs, I do:
> v3PV -> aSub(Reading) -> v7Struct -> operator (via native system)
> 
> This works well.  Where I'm having difficulty is the other way around:
> operator -> v7Struct ->(?) aSub(Setting) -> v3PV
> 
> In other words, I don't know how to get my v7Struct to process my 
> aSub(Setting).
> I've been going through exampleCPP, which is a very helpful work, but thin
> on documentation.  Do I need to set up a PvaClient and set up monitor and
> then a link, or is there someway to do this directly from PVData or 
> PVDatabase?
> Thank you,
> Pierrick
> 

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System