RE: NTNDArrays, Java

[Mark Rivers <rivers@cars.uchicago.edu>]

He is correctly connected to the NDPluginPva server.

 

From: tech-talk-bounces@aps.anl.gov [mailto:tech-talk-bounces@aps.anl.gov] On Behalf Of bob dalesio
Sent: Friday, March 10, 2017 11:10 AM
To: Madden, Timothy J.
Cc: EPICS tech-talk
Subject: Re: NTNDArrays, Java

 

Are you connected to the area detector server or the waveform record?

We are now working on making records put in the metadata.

Bob

 

On Mar 10, 2017 11:16 AM, "Madden, Timothy J." <tmadden@aps.anl.gov> wrote:

I am playing with NTNDArrays. I generate them from AD 2-5 with a sim detector and the pva plugin.
pvget can display the arrays that pop out of the driver.

Now I am writing a java program to monitor and eventually display in Image J.

The code is below.

I problem I have is that the dimensions and uniqie ID seem to be abscent from the data.
Also, calling NTNDArray.wrap fails, as the returned data seems to be not a real NT ND Array.

Furtner, the image data is byte[] type. I can get out the Union or values, or call toString to get the raw data.
I am not sure how  Java figures out if the union is bytes or ints or whatever.
I will have to be able to ask the NTNDArray what its datatype is, then convert to ints or whatever the datatype is. Not sure how this is done.
I have looked at the C++ code for the PVA ADDriver in AD2-5, but there are differences between cpp and java interfaces.
Also I have to call wrapUnsafe to even convert  the PVStructure into NTNDArray, which makes no sense. wrap fails.



Thanks
Tim Madden

Code below:


    public static void main(String[] args) {
        // TODO Auto-generated method stub

        System.out.println("Maddens test java get image");
        if (true)
        {
        PvaClient pva=PvaClient.get();
        PvaClientChannel mychannel = pva.channel("13SIM1:Pva1:Image");
       
       
        PvaClientMonitor pvamon=mychannel.monitor();
        //pvamon.connect();
        pvamon.start();
       
        PvaClientMonitorData easydata = pvamon.getData();
       
       
        while(true)
        {
        pvamon.waitEvent(0);
       
        //String sc = easydata.showChanged();
        PVStructure pvs = easydata.getPVStructure();
       
       
        NTNDArray myarray =NTNDArray.wrapUnsafe(pvs);
        //String imgstr = myarray.toString();
           
        PVUnion pvu = myarray.getValue();
       
        PVStructureArray dims = myarray.getDimension();
       
        //org.epics.pvdata.pv.Field a = pvu.getField();
        //PVInt uniqid = myarray.getUniqueId();
       
       
        //PVStructureArray psa =myarray.getAttribute();
   
        System.out.println("got data ");

        pvamon.releaseEvent();
       
        }
   
        }
   
       
        System.out.println("Maddens test java end");

    }