Re: can't initialize record field with string

[Tim Mooney <mooney@aps.anl.gov>]

haquin wrote:
> Hi Tim,
>
> Thank you for your proposal but:
> I looked in the genSub record code and I think that what I do should 
> work ...
> After deeper investigations, it turns out that when I initialize the 
> INPH field type with FTH=STRING or CHAR it is then assigned a CA_LINK 
> type ((*plinkin).type)==CA_LINK instead of CONSTANT ...
> That's why the Constant string is not copied at init.
>
> When FTH=LONG then ((*plinkin).type)==CONSTANT
>
> How can I force it to be a CONSTANT
I think the only way to make the link type CONSTANT is to make the
link value entirely numeric.  As I read the code, FTH should have no
effect on the link type, because the EPICS code that makes the decision
doesn't look at anything other than the link value.

> Tim Mooney a écrit :
> > haquin wrote:
> > > Hi,
> > >
> > > I initialize the INPH (with macro substitution) of a gensub record 
> > > with a string,
> > > but it is never transferred to the corresponding H variable ...
> > >
> > > in the IOC shell I use the commands:
> > > epics> dbgf MyGensub.INPH
> > >        DBR_STRING:          MyString NPP NMS
> > >
> > > epics> dbgf MyGensub.H
> > >        DBR_STRING:
> > >
> > > The behaviour is different if I use LONG instead of STRING ...
> > >
> > > Can someone tell me how to do retreive MyString in MyGensub.H ?
> > You can use a stringout record to hold the string, like so:
> >
> > record(stringout, "myStringInit") {
> >    field(VAL, "$(MYSTRINGMACRO)")
> >    field(UDF, "0")
> > }
> > record(aSub, "myASub") {
> >    ....
> >    field(INPH, "myStringInit")
> >    ....
> > }
> >
> > Then, dbLoadRecords("myDatabase.db", "MYSTRINGMACRO=MyString")
--
Tim Mooney (mooney@aps.anl.gov) (630)252-5417
Beamline Controls & Data Acquisition Group
Advanced Photon Source, Argonne National Lab.