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Subject: Re: I'm looking for a pvacces example to read PVStructure
From: Marty Kraimer via Tech-talk <tech-talk@aps.anl.gov>
To: tech-talk@aps.anl.gov
Date: Tue, 12 Mar 2019 10:26:00 -0400
On 3/12/19 4:57 AM, will.rogers--- via Tech-talk wrote
________________________________
From: tech-talk-bounces@aps.anl.gov <tech-talk-bounces@aps.anl.gov> on behalf of Heinz Junkes via Tech-talk <tech-talk@aps.anl.gov>
Sent: 11 March 2019 16:41:54
To: tech-talk
Subject: I'm looking for a pvacces example to read PVStructure

I'm looking for a pva example c++ program which I can currently use (with Epics 7).

Unfortunately the examples I've found on the net don't work at all.

Above all, there seems to be a little confusion between PVAClient and pvac? (Or I don't get it)

I have a client that wants to read the PVStructure of a PV and then put new data  into
NTTable vector fields (x, y, z and time_index):

humma-kavula:~ junkes$ pvlist 0xB9EC6A5C00000000C2AFA421
CRYVISIL:STM:FASTSCAN:IMAGE_CHUNK

humma-kavula:~ junkes$ pvinfo CRYVISIL:STM:FASTSCAN:IMAGE_CHUNK
CHANNEL  : CRYVISIL:STM:FASTSCAN:IMAGE_CHUNK
STATE    : CONNECTED
ADDRESS  : 141.14.133.59:53379
epics:nt/NTTable:1.0
     string[] labels
     structure value
         double[] x
         double[] y
         double[] z
         int[] time_index
     string descriptor
     alarm_t alarm
         int severity
         int status
         string message
     time_t timeStamp
         long secondsPastEpoch
         int nanoseconds
         int userTag
     int counter



To read the PVStructure you can issue

pvget -r "" -v  CRYVISIL:STM:FASTSCAN:IMAGE_CHUNK

I do not know if any command line tool can change all the value fields with one command.
You could make the changes with the following set of commands:
pvput -r "value.x"  CRYVISIL:STM:FASTSCAN:IMAGE_CHUNK x0 x1 ...
pvput -r "value.y"  CRYVISIL:STM:FASTSCAN:IMAGE_CHUNK y0 y1 ...
pvput -r "value.z"  CRYVISIL:STM:FASTSCAN:IMAGE_CHUNK z0 z1 ...
pvput -r "value.time_index"  CRYVISIL:STM:FASTSCAN:IMAGE_CHUNK i0 i1 ...


You could create your own client code that uses channelPutGet to put all values and gets the entire structure.

Using pvaClientCPP your code would be something like:

   PvaClientChannelPtr channel = pva->channel("CRYVISIL:STM:FASTSCAN:IMAGE_CHUNK");     PvaClientPutGetPtr putGet = channel->createPutGet("putField(value)getField()");
    putGet->connect();
    PvaClientPutDataPtr putData = putGet->getPutData();
    PVStructurePtr pvValue = putData->getPVStructure();
    // CODE TO  PUT ALL FIELDS IN value

    putGet->putGet();
    PvaClientGetDataPtr getData = putGet->getGetData();
    cout << getData->getPVStructure() << endl;


Marty



Replies:
Re: I'm looking for a pvacces example to read PVStructure Heinz Junkes via Tech-talk
References:
I'm looking for a pvacces example to read PVStructure Heinz Junkes via Tech-talk
Re: I'm looking for a pvacces example to read PVStructure will.rogers--- via Tech-talk

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