Experimental Physics and
Industrial Control System

Hi all,

I have a problem with EPICS 7.0.8 when trying to retrieve image data from an areaDetector using the pva protocol.
I'm using the Pva plugin because of the size of the image (61 Mpixels). The PV is "cam:Pva1:Image" and in my program
using pvAccess I get the following error:

Error: PvaClientData::getDoubleArray() did not find a scalarArray field

When doing the following:

pva = PvaClient::get("pva ca");
PvaClientChannelPtr channel = pva->channel("cam:Pva1:Image", "pva", 2.0);
epics::pvData::shared_vector<const double> array = channel->getDoubleArray();

Enabling debugging for pva gives the following:

PvaClientChannel::PvaClientChannel channelName WIZZLERHD:HZDR:asicam1:Pva1:Image
PvaClientChannel::connect channelName WIZZLERHD:HZDR:asicam1:Pva1:Image
PvaClientChannel::issueConnect channelName WIZZLERHD:HZDR:asicam1:Pva1:Image
PvaClientChannel::issueConnect calling provider->createChannel
PvaClientChannel::channelCreated channelName WIZZLERHD:HZDR:asicam1:Pva1:Image connectState 1 isConnected false status.isOK true
PvaClientChannel::waitConnect channelName WIZZLERHD:HZDR:asicam1:Pva1:Image
 PvaClientChannel::channelStateChange  channelName WIZZLERHD:HZDR:asicam1:Pva1:Image CONNECTED
PvaClientGet::create(pvaClient,channelName,pvRequest)
 channelName WIZZLERHD:HZDR:asicam1:Pva1:Image pvRequest structure 
    structure field
        structure value

PvaClientGet::PvaClientGet channelName WIZZLERHD:HZDR:asicam1:Pva1:Image
PvaClientGet::connect channelName WIZZLERHD:HZDR:asicam1:Pva1:Image
PvaClientGet::issueConnect channelName WIZZLERHD:HZDR:asicam1:Pva1:Image
PvaClientGet::waitConnect channelName WIZZLERHD:HZDR:asicam1:Pva1:Image
PvaClientGet::channelGetConnect channelName WIZZLERHD:HZDR:asicam1:Pva1:Image status.isOK true
PvaClientGetData::create
PvaClientGet::get channelName WIZZLERHD:HZDR:asicam1:Pva1:Image
PvaClientGet::issueGet channelName WIZZLERHD:HZDR:asicam1:Pva1:Image
PvaClientGet::waitGet channelName WIZZLERHD:HZDR:asicam1:Pva1:Image
PvaClientGet::getDone channelName WIZZLERHD:HZDR:asicam1:Pva1:Image status.isOK true
PvaClientData::setData
PvaClientGet::getData  channelName WIZZLERHD:HZDR:asicam1:Pva1:Image
PvaClientGet::checkConnectState channelName WIZZLERHD:HZDR:asicam1:Pva1:Image
PvaClientData::getDoubleArray
PvaClientData::getSinglePVField
Error: PvaClientData::getDoubleArray() did not find a scalarArray field

The array vaiable is 0 in this case.
No clue what I am doing wrong here?

I can retrieve the value of the pv with pvget. So it exists and is correctly filled.
Any help appreciated!

Regards

Jörn

Replies:

Re: AreaDetector Pva problem Jörn Dreyer via Tech-talk

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