Re: How to get a list of all available PVs

[Carlos Pascual <cpascual@cells.es>]

Hi Pavel, 

Thanks a lot for the quick answer.

Unfortunately what I need is getting the list from a client.
I was hoping that I could somehow broadcast some network message and have all 
IOCs or PVs replying...

I understand that both the ssh and the procServ methods would require that the 
user running the client has shell access to the box running the IOC (and I 
suppose that this is not a general case)

Also, I understand that in general there may be more than one box running 
IOCs. Is there any way of discovering them on a local network (e.g., by a port 
scan on a certain known port?)

Cheers


On Mon 17 December 2012 09:49:54 Pavel Maslov wrote:
> Hi Carlos,
> 
> on the IOC side issue *dbl* (in the epics shell):
> 
> epics> dbl
> And you'll get all the PVs loaded in to EPICS database.
> 
> If you want to get a list of PVs on the client side though, then I don't
> think that can be implemented as easily as I have descibed above.
> You can always ssh to the IOC box and either execute st.cmd and use the dbl
> command, or use procServ to connect to a running IOC. In this case, I
> suspect the st.cmd file should contain dbl after the iocInit command. As
> for the latter, I have never used procServ myself. So just guessing.
> 
> On Mon, Dec 17, 2012 at 12:38 PM, Carlos Pascual <cpascual@cells.es> wrote:
> > Hi,
> > 
> > Sorry for this newbie question... I come from the Tango community, and I
> > am quite lost with Epics
> > 
> > I am a developer of Taurus [1], a GUI library initially designed to
> > provide PyQT GUIs on top of Tango. But our goal is to also support other
> > communication/control systems such as Epics.
> > 
> > I recently implemented some very basic support for epics in Taurus (just
> > a proof of concept) using PyEpics, and one of the first questions that I
> > came across is:
> > 
> > How can I obtain a list of all PVs that are available?
> > 
> > ... or even better, can I get a list of all PVs whose name contains a
> > certain
> > prefix?
> > 
> > The reason I want this is that I want to create a browser/selector of
> > PVs. I
> > do not care that much if the method is slow (I could live with doing it
> > once
> > and only manually refreshing the list).
> > But I need the method to be generic, i.e. it should not assume some non-
> > standard service (such a site-dependent database) to be available.
> > 
> > Is this possible at all?
> > 
> > Cheers,
> > 
> > [1] http://www.tango-controls.org/static/taurus/latest/doc/html/
> > 
> > --
> > +----------------------------------------------------+
> > 
> >  Carlos Pascual Izarra
> >  Scientific Software Coordinator
> >  Computing Division
> >  Cells / Alba Synchrotron  [http:/www.cells.es]
> >  Carretera BP 1413 de Cerdanyola-Sant Cugat, Km. 3.3
> >  E-08290 Cerdanyola del Valles (Barcelona), Spain
> >  E-mail: cpascual@cells.es
> >  Phone: +34 93 592 4428
> > 
> > +----------------------------------------------------+

-- 
+----------------------------------------------------+
 Carlos Pascual Izarra
 Scientific Software Coordinator
 Computing Division
 Cells / Alba Synchrotron  [http:/www.cells.es]
 Carretera BP 1413 de Cerdanyola-Sant Cugat, Km. 3.3
 E-08290 Cerdanyola del Valles (Barcelona), Spain
 E-mail: cpascual@cells.es
 Phone: +34 93 592 4428
+----------------------------------------------------+