Hi:
> Michael will have to answer the "what changed" question,
Looking further, the difference in pvget seems to be that a plain
pvget ThePV
now always seems to be the same as
pvget -r 'field(value)' ThePV
That works for most normative types that have a "value" as a top-level field, but can of course fail for a custom structure.
In the past, pvget was more lenient. Maybe it checked the structure description, and if there's no "value", it would drop back to performing a "-r field()" request?
Here's the output of the older example compiled with base 3.15.5 and EPICS-CPP-4.6.0:
# Plain 'pvget' succeeds, reports same as pvget -r 'field()' neutrons:
$ pvget neutrons
neutrons
structure
time_t timeStamp 2018-08-28T12:40:37.707 1143
epics:nt/NTScalar:1.0 proton_charge
double value 4e+08
epics:nt/NTScalarArray:1.0 time_of_flight
uint[] value [1143,1143,1143,1143,1143,1143,1143,1143,1143,1143]
epics:nt/NTScalarArray:1.0 pixel
uint[] value [11430,11430,11430,11430,11430,11430,11430,11430,11430,11430]
$ pvget -r 'field()' neutrons
neutrons
structure
time_t timeStamp 2018-08-28T12:41:49.185 7469
epics:nt/NTScalar:1.0 proton_charge
double value 1e+09
epics:nt/NTScalarArray:1.0 time_of_flight
uint[] value [7469,7469,7469,7469,7469,7469,7469,7469,7469,7469]
epics:nt/NTScalarArray:1.0 pixel
uint[] value [74690,74690,74690,74690,74690,74690,74690,74690,74690,74690]
# If I try to fetch the non-existing top-level "value" field, I get the same error as the new plain "pvget" reports:
$ pvget -r 'field(value)' neutrons
[neutrons] failed to create channel get: Status [type=ERROR, message=invalid pvRequest]
I could argue either way:
a) "pvget" without "-r .." should assume that we're reading a normative type, i.e. use "field(value)" and fail if there is no value.
b) "pvget" should get something. First try "value", but if the PV info doesn't show a value field, just dump everything.
Thanks,
Kay
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- Re: "Invalid request" for simply "pvget ThePV" when all other requests seem fine Andrew Johnson
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- "Invalid request" for simply "pvget ThePV" when all other requests seem fine Kasemir, Kay
- Re: "Invalid request" for simply "pvget ThePV" when all other requests seem fine Andrew Johnson
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