putScalarArray fails for numbers > 6 digits

[jsparger]

Hi. I am unable to put an array where any value contains a string longer than 6 digits using the method Channel::putScalarArray. However, pvput works fine on the command line.

I also tried constructing a PvScalarArray of type ULONG, but a pvaccess.PvScalarArray is not accepted by Channel::putScalarArray.

Below are the database I used and the commands which can be run to reproduce the error. I am using pvapy 2.2

(dgro_asub) jsparger@spectre:dgro_asub$ pip freeze | grep pvapy
pvapy==2.2.0

record(waveform, "Addresses")
{
    field(DESC, "Addresses")
    field(FTVL, "ULONG")
    field(NELM, "3")
}

In [1]: import pvaccess                                                                              

In [2]: c = pvaccess.Channel("Addresses")                                                            

In [3]: print(c.get())                                                                               
epics:nt/NTScalarArray:1.0 
    uint[] value [123456]
    alarm_t alarm
        int severity 0
        int status 0
        string message NO_ALARM
    time_t timeStamp
        long secondsPastEpoch 1591882692
        int nanoseconds 459499857
        int userTag 0
    structure display
        double limitLow 0
        double limitHigh 0
        string description Addresses
        string units 
        int precision 0
        enum_t form
            int index 0
            string[] choices ["Default", "String", "Binary", "Decimal", "Hex", "Exponential", "Engineering"]
    control_t control
        double limitLow 0
        double limitHigh 0
        double minStep 0
    valueAlarm_t valueAlarm
        boolean active false
        double lowAlarmLimit nan
        double lowWarningLimit nan
        double highWarningLimit nan
        double highAlarmLimit nan
        int lowAlarmSeverity 0
        int lowWarningSeverity 0
        int highWarningSeverity 0
        int highAlarmSeverity 0
        byte hysteresis 0


In [4]: c.putScalarArray([123456])                                                                   

In [5]: c.get()["value"]                                                                             
Out[5]: array([123456], dtype=uint32)

In [6]: c.putScalarArray([1234567])                                                                  
---------------------------------------------------------------------------
PvaException                              Traceback (most recent call last)
<ipython-input-6-4152885d1ebd> in <module>
----> 1 c.putScalarArray([1234567])

PvaException: parseToPOD: Extraneous characters

In [7]: quit()         
                                                                              
(dgro_asub) jsparger@spectre:dgro_asub$ pvput Addresses [1234567]
Old : 2020-06-11 15:39:19.060  [123456]
New : 2020-06-11 15:43:26.610  [1234567]

[sveseli]

Thanks for sending this, I did reproduce the problem on my end.

[sveseli]

As a temporary workaround, this should work:

bluegill2> python -c "from pvaccess import *; c = Channel('Addresses'); c.put([1]); pv = c.get(); print(pv['value']); pv.setScalarArray([1234567890]); c.put(pv); pv2=c.get(); print(pv2['value'])"
[1]
[1234567890]

[jsparger]

This works. Thanks @sveseli.

[jsparger]

For anyone who finds this between now and the fix, the first put is not necessary, it was just to show how it works. Just getting a pv object and using it to set the value is enough.

In [1]: import pvaccess                                                                                                                                                               

In [2]: c = pvaccess.Channel("Addresses")                                                                                                                                             

In [3]: pv = c.get()                                                                                                                                                                  

In [4]: pv.setScalarArray([123456789])                                                                                                                                                

In [5]: c.put(pv)                                                                                                                                                                     

In [6]: c.get()['value']                                                                                                                                                              
Out[6]: array([123456789], dtype=uint32)

[sveseli]

This issue is resolved in release 2.3.0.