Re: How to write a soft record with a constant long string value

["Cobb, Tom \(DLSLtd,RAL,LSCI\) via Tech-talk" <tech-talk at aps.anl.gov>]

This is my best attempt so far:

record(waveform, "TEST") {
  field(NELM, 200)
  field(FTVL, "STRING")
  field(INP, [
    "a line that contains up to 39 chars,",
    "a space will be inserted before the",
    "next line. 'This works too', and so",
    "does {}, but backslash n and",
    "backslash escaped double quotes",
    "don't *seem* to work."
  ])
}

$ caget TEST.VAL
TEST.VAL 200 a line that contains up to 39 chars, a space will be inserted before the next line. \'This works too\', and so does {}, but backslash n and backslash escaped double quotes don\'t *seem* to work. 

The lack of \" makes it a bit difficult to put JSON in it, although I could always use a single quote and convert on the client...

I've tried the const JSON links too, but they also don't accept escaped quotes.

Any other ideas?

Thanks,

Tom

---

From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of Cobb, Tom (DLSLtd,RAL,LSCI) via Tech-talk <tech-talk at aps.anl.gov>
Sent: 18 August 2020 10:04
To: tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>
Subject: How to write a soft record with a constant long string value

 

Hi all,

I would like to write a database file with a single record that holds a constant chunk of JSON (generated by a script at IOC build time). I would prefer to do this by writing the JSON into the database file itself, rather than having to use a separate file, or dbpf.

Does anyone know if this is possible?

Thanks,

Tom

 

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Diamond Light Source Limited (company no. 4375679). Registered in England and Wales with its registered office at Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, United Kingdom