Re: CPP example NTTable builder

[Heinz Junkes <junkes@fhi-berlin.mpg.de>]

Hi Michael,

your example The example works exactly as expected. Also with RTEMS5.

The crashes I observed are  in connection with the VMEbus implementation on the MVME6100.

I want to use the NTTable for image data collected on a path “through" the image:

[junkes@dune epics]$ pvinfo struckPVArray
CHANNEL  : struckPVArray
STATE    : CONNECTED
ADDRESS  : 141.14.128.12:5075
epics:nt/NTTable:1.0
   string[] labels
   structure value
       double[] ts
       double[] X
       double[] Y
       double[] Z


[junkes@dune epics]$ pvget -r 'field(value)' struckPVArray
struckPVArray
structure
   structure value
       double[] ts [3.55087e+12,3.55092e+12,3.55098e+12,3.55103e+12,3.55109e+12,3.55114e+12,3.5512e+12,3.55125e+12,3.55131e+12,3.55136e+12,3.55142e+12,3.55147e+12,3.55153e+12,3.55158e+12,3.55164e+12,3.55169e+12,3.55175e+12,3.5518e+12,3.55186e+12,3.55191e+12,3.55197e+12,3.55202e+12,3.55208e+12,3.55213e+12,3.55219e+12,3.55224e+12,3.5523e+12,3.55235e+12,3.55241e+12,3.55246e+12,3.55252e+12,3.55257e+12,3.55263e+12,3.55268e+12,3.55274e+12,3.55279e+12,3.55285e+12,3.5529e+12,3.55296e+12,3.55301e+12,3.55307e+12,3.55312e+12,3.55318e+12,3.55323e+12,3.55329e+12,3.55334e+12,3.5534e+12,3.55345e+12,3.55351e+12,3.55356e+12,3.55362e+12,3.55367e+12,3.55373e+12,3.55378e+12,3.55384e+12,3.55389e+12,3.55395e+12,3.554e+12,3.55406e+12,3.55411e+12,3.55417e+12,3.55422e+12,3.55428e+12,3.55433e+12,3.55439e+12,3.55444e+12,3.5545e+12,3.55455e+12,3.55461e+12,3.55466e+12,3.55472e+12,3.55477e+12,3.55483e+12,3.55488e+12,3.55494e+12,3.55499e+12,3.55505e+12,3.5551e+12,3.55516e+12,3.55521e+12,3.55527e+12,3.55532e+12,3.55538e+12,3.55543e+12,3.55549e+12,3.55554e+12,3.5556e+12,3.55565e+12,3.55571e+12,3.55576e+12,3.55582e+12,3.55587e+12,3.55593e+12,3.55598e+12,3.55604e+12,3.55609e+12,3.55615e+12,3.5562e+12,3.55626e+12,3.55631e+12]
       double[] X [0.0356783,0.0356783,0.0359882,0.0359882,0.0356783,0.0359882,0.0359882,0.0359882,0.0359882,0.0359882,0.0359882,0.0359882,0.0359882,0.0356783,0.0356783,0.0359882,0.0359882,0.0359882,0.0362981,0.0359882,0.0356783,0.0359882,0.0359882,0.0359882,0.0359882,0.0356783,0.0359882,0.0359882,0.0359882,0.0359882,0.0362981,0.0359882,0.0359882,0.0359882,0.0362981,0.0359882,0.0359882,0.0359882,0.0356783,0.0359882,0.0359882,0.0359882,0.0359882,0.0359882,0.0359882,0.0359882,0.0359882,0.0359882,0.0359882,0.0359882,0.0359882,0.0359882,0.0359882,0.0359882,0.0359882,0.0359882,0.0359882,0.0359882,0.0359882,0.0356783,0.0359882,0.0359882,0.0359882,0.0359882,0.0356783,0.0359882,0.0359882,0.0359882,0.0359882,0.0356783,0.0359882,0.0356783,0.0356783,0.0359882,0.0359882,0.0359882,0.0359882,0.0359882,0.0359882,0.0356783,0.0356783,0.0359882,0.0359882,0.0359882,0.0359882,0.0359882,0.0359882,0.0359882,0.0359882,0.0359882,0.0359882,0.0359882,0.0359882,0.0359882,0.0356783,0.0359882,0.0356783,0.0359882,0.0359882,0.0359882]
       double[] Y [0.0521035,0.0521035,0.0521035,0.0521035,0.0521035,0.0524134,0.0521035,0.0521035,0.0521035,0.0521035,0.0521035,0.0521035,0.0524134,0.0521035,0.0521035,0.0524134,0.0521035,0.0521035,0.0524134,0.0521035,0.0521035,0.0524134,0.0521035,0.0524134,0.0524134,0.0521035,0.0524134,0.0521035,0.0521035,0.0524134,0.0521035,0.0524134,0.0524134,0.0521035,0.0524134,0.0524134,0.0521035,0.0521035,0.0524134,0.0524134,0.0521035,0.0521035,0.0521035,0.0521035,0.0521035,0.0521035,0.0524134,0.0521035,0.0521035,0.0521035,0.0521035,0.0524134,0.0521035,0.0524134,0.0521035,0.0521035,0.0521035,0.0521035,0.0521035,0.0524134,0.0524134,0.0521035,0.0524134,0.0521035,0.0521035,0.0521035,0.0521035,0.0524134,0.0521035,0.0521035,0.0524134,0.0524134,0.0521035,0.0524134,0.0524134,0.0521035,0.0521035,0.0521035,0.0521035,0.0524134,0.0524134,0.0524134,0.0524134,0.0524134,0.0521035,0.0521035,0.0521035,0.0524134,0.0521035,0.0524134,0.0521035,0.0521035,0.0521035,0.0521035,0.0521035,0.0521035,0.0521035,0.0521035,0.0524134,0.0316495]
       double[] Z [0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0359882,0.0356783,0.0359882,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0359882,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0353684,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0359882,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783,0.0356783]

Heinz

> On 20. Jun 2018, at 08:02, Michael Davidsaver <mdavidsaver@gmail.com> wrote:
> 
> On 06/19/2018 10:49 AM, Heinz Junkes wrote:
>> HI,
>> 
>> try to create NTTable :
>> 
>> NTTableBuilderPtr builder = NTTable::createBuilder();
>> 
>>    PVStructurePtr pvStructure = builder->
>>            addColumn("ts", pvInt)->
>>            addColumn("X", pvDouble)->
>>            addColumn("Y", pvDouble)->
>>            addColumn("Z", pvDouble)->
>>            addDescriptor()->
>>            addAlarm()->
>>            addTimeStamp()->
>>            createPVStructure();
>> 
>> Unfortunately, I always end up with "core-dump” on the RTEMS-system.
> 
> Are you able to test on another OS as well?
> 
>> I have not understood yet how to specify the length for the four arrays (pvInt, pvDouble [X,Y,Z] ) connected to the 4 columns.
>> I thought I had to add an array structure to the 4 columns. But I found nothing in the nttable.h file how to do that.
>> Every note is welcome as always.
> 
> As the reluctant maintainer of normativeTypesCPP I'm recommending not to use class NTTable.
> I've not found it so helpful since, as you've found, it doesn't help with handling column data.
> 
> A more complete example, which should compile and not crash (it's late).
> 
>> #include <pv/pvData.h>
>> #include <pv/standardField.h>
>> namespace pvd = epics::pvData;
>> 
>> static
>> pvd::StructureConstPtr typedesc(pvd::getFieldCreate()->createFieldBuilder()
>>                                ->setId("epics:nt/NTTable:1.0")
>>                                ->addArray("labels", pvd::pvString)
>>                                ->addNestedStructure("value")
>>                                    ->addArray("ts", pvd::pvInt)
>>                                    ->addArray("X", pvd::pvDouble)
>>                                    ->addArray("Y", pvd::pvDouble)
>>                                    ->addArray("Z", pvd::pvDouble)
>>                                ->endNested()
>>                                //->add("timeStamp", pvd::getStandardField()->timeStamp()) // unused in this example
>>                                //->add("alarm", pvd::getStandardField()->alarm())
>>                                ->createStructure());
>> 
>> pvd::PVStructure::shared_pointer buildTable(){
>>    pvd::shared_vector<std::string> labels;
>>    labels.push_back("The TS");
>>    labels.push_back("The X");
>>    labels.push_back("The Y");
>>    labels.push_back("The Z");
>> 
>>    pvd::shared_vector<pvd::int32> ts;
>>    pvd::shared_vector<double> X, Y, Z;
>> 
>>    for(size_t i=0; i<10; i++) { // some fake data
>>        ts.push_back(i*10);
>>        X.push_back(i);
>>        Y.push_back(i+1);
>>        Z.push_back(i+2);
>>    }
>> 
>>    pvd::PVStructure::shared_pointer value(pvd::getPVDataCreate()->createPVStructure(typedesc));
>> 
>>    value->getSubFieldT<pvd::PVScalarArray>("labels")->putFrom(freeze(labels));
>>    value->getSubFieldT<pvd::PVScalarArray>("value.ts")->putFrom(freeze(ts));
>>    value->getSubFieldT<pvd::PVScalarArray>("value.X")->putFrom(freeze(X));
>>    value->getSubFieldT<pvd::PVScalarArray>("value.Y")->putFrom(freeze(Y));
>>    value->getSubFieldT<pvd::PVScalarArray>("value.Z")->putFrom(freeze(Z));
>> 
>>    return value;
>> }
>

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