Experimental Physics and Industrial Control System
Hi Zen,
On Sunday 23 May 2010 18:17:31 Szalata, Zenon M. wrote:
> I am initializing a mbbo record with "menu" strings from my device driver.
> This is done on demand and it works well. Unfortunately, the record does
> not issue a monitor when that is done so EDM does not get that the record
> now has new set of strings. If I toggle EDM to edit then to execute it
> gets the new strings.
>
> How can I nudge the mbbo record from my device driver to issue a monitor?
> I have access to the records data structure.
Which version of Base are you using? If you have R3.14.11 there is a new
event type called DBE_PROPERTY which we added to signal this kind of metadata
change to the clients. It currently only gets generated by the mbb[io] record
types when someone modifies the state values or strings; you can see that by
looking in the special() routine for those record types.
Unfortunately there are probably no clients that actually support this yet,
but IIRC the approach is backwards compatible if you want to add it to your
favourite client(s). The change required would be to replace the initial
ca_get_callback() using the DBR_GR_ENUM with a ca_create_subscription() for
DBE_PROPERTY events and make sure that the client expects it. The server will
generate one such event at connection time even if the IOC code never posts
another one, but those IOCs that do generate such events will update their
clients whenever the channel properties are flagged.
HTH,
- Andrew
--
The best FOSS code is written to be read by other humans -- Harald Welte
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