Experimental Physics and
Industrial Control System

From: Core-talk <[email protected]> on behalf of EPICS Core Talk <[email protected]>
Reply-To: Ralph Lange <[email protected]>
Date: Thursday 16 January 2020 at 11:36
To: EPICS Core Talk <[email protected]>
Subject: pvput JSON syntax

Dear Core colleagues,

New: pvput does not support anymore JSON field assignment 

The command line help does not mention this removal of functionality.
$ pvput -h
Usage: pvput [options] <PV name> <value>
       pvput [options] <PV name> <size/ignored> <value> [<value> ...]
       pvput [options] <PV name> <field>=<value> ...
       pvput [options] <PV name> <json_array>
       pvput [options] <PV name> <json_map>
options:
  -h: Help: Print this message
  -V: Print version and exit
  -r <pv request>:   Request, specifies what fields to return and options,
default is ''
  -w <sec>:          Wait time, specifies timeout, default is 5.000000
second(s)
  -p <provider>:     Set default provider name, default is 'pva'
  -M <raw|nt|json>:  Output mode.  default is 'nt'
  -v:                Show entire structure (implies Raw mode)
  -q:                Quiet mode, print only error messages
  -d:                Enable debug output
 Deprecated options:
  default: Auto - try value as enum string, then as index number
  -n, -s, -F, -t: ignored
  -f <input file>: error
 JSON support is present
Examples:
  pvput double01 1.234       # shorthand
  pvput double01 value=1.234
  pvput arr:pv X 1.0 2.0  # shorthand  (X is arbitrary and ignored)
  pvput arr:pv "[1.0, 2.0]"            # shorthand
  pvput arr:pv value="[1.0, 2.0]"
Field values may be given with JSON syntax.
Complete structure
  pvput double01 '{"value":1.234}'
Sub-structure(s)
  pvput group:pv some='{"value":1.234}' other='{"value":"a string"}'
$ /usr/bin/pvput PVA-SRV-TESTS:INTEGER '{"value":4321}'
JSON syntax not supported by this build.