Re: Strange error from pvAccess

[Mark Rivers via Tech-talk <tech-talk at aps.anl.gov>]

Hi Jörn,

You might want to take a look at the code here which converts between NDArrays and NTNDArrays.

https://github.com/areaDetector/ADCore/blob/master/ADApp/ntndArrayConverterSrc/ntndArrayConverter.cpp

Mark

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From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of Jörn Dreyer via Tech-talk <tech-talk at aps.anl.gov>
Sent: Tuesday, October 24, 2023 7:04 AM
To: tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>
Subject: Strange error from pvAccess

 

Hello,

I am using pvAccess to read image data from a NDPluginPVA in areaDetector.
When I do the following lines in my program:

PvaClientChannelPtr channel = pva->channel((m_ImagePrefix + *imgDataPV).toStdString().c_str(), m_AccessMethod->toStdString().c_str(), 2.0);
epics::pvData::shared_vector<const double> array = channel->getDoubleArray();

I get an error:
Error: PvaClientData::getDoubleArray() did not find a scalarArray field

m_AccessMethod->toStdString().c_str() returns "pva".
If I use the same code with channel access it works.
Do I have to pass some special string to getDoubleArray in case of NDPluginPVA?


Regards,

Jörn