Experimental Physics and
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<== Date ==>		<== Thread ==>

Subject:	Re: Retrieving record name from aSub input/output fields
From:	Andrew Johnson via Tech-talk <tech-talk at aps.anl.gov>
To:	"Wang, Andrew" <wang126 at llnl.gov>, EPICS tech-talk <tech-talk at aps.anl.gov>
Date:	Wed, 27 Jul 2022 11:25:41 -0500

Hi Andy,

On 7/26/22 6:53 PM, Wang, Andrew via Tech-talk wrote:

Update. I think I got it. I had to do the following.

static long func(aSubRecord *prec)
{
    DBLINK inpa = prec->inpa;
    char *rec_name = inpa.value.pv_link.pvname;
    printf("Record name in INPA is %s\n", rec_name);
    return 0;
}

A DBLINK is a structure (not a pointer) so your first line of code is copying data that you don't need to do, and the value.pvlink union member is only valid for certain kinds of link, so I would suggest something like this, which adds protection from that by only showing DB and CA links:

static long func(aSubRecord *prec)
{
    DBLINK *plink = &prec->inpa;
    if (plink->type == DB_LINK || plink->type == CA_LINK) {
      const char *target = plink->value.pv_link.pvname;
        printf("Record %s.INPA links to %s\n", prec->name, target);
    }
    return 0;
}

HTH,

- Andrew

From: Wang, Andrew
Sent: Tuesday, July 26, 2022 4:17 PM
To: EPICS tech-talk <tech-talk at aps.anl.gov>
Subject: Retrieving record name from aSub input/output fields

Hi all,

Quick question this time. I was wondering if there was a way to retrieve the name of the record referenced in an OUTLINK/INLINK field such as INPA, OUTA, etc. in the aSub routine.

For instance, suppose I had an aSub record such as the following.

record(aSub, “example”)

{

                field(SNAM, “func”)

                field(INPA, “rec_in_inpa”)

}

I would like to be able to print the name of the record in INPA within “func”.

static long func(aSubRecord *prec)

{

                char *rec_name = prec->____;

                printf(“Record name in INPA is %s\n”, rec_name);

                return 0;

}

Thanks,

Andy

Purple ribbon awareness

-- 
Complexity comes for free, Simplicity you have to work for.

References:: Retrieving record name from aSub input/output fields Wang, Andrew via Tech-talk; Re: Retrieving record name from aSub input/output fields Wang, Andrew via Tech-talk

Navigate by Date:: Prev: Re: Retrieving record name from aSub input/output fields Michael Davidsaver via Tech-talk; Next: Re: Retrieving record name from aSub input/output fields Wang, Andrew via Tech-talk; Index: 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 <2022> 2023 2024
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ANJ, 14 Sep 2022

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System