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<== Date ==> <== Thread ==>

Subject: using the JCA extension
From: Sharon Lackey <slackey@fnal.gov>
To: tech-talk@aps.anl.gov
Date: Wed, 29 Mar 2006 11:24:45 -0600

I am trying to use the JCA extension from the binary download.   I have tried it on windows and on Fermi Scientific Linux and get the same result.   I’m using the example Java program to connect to a channel from the virtual linac IOC.  The channel connects without error but when I read the value it is unintelligible.  Here is what I’m doing in Java…

 

 

   try {

        JCALibrary jca= JCALibrary.getInstance();

        Context ctxt= jca.createContext(JCALibrary.JNI_SINGLE_THREADED);

        ctxt.printInfo();    

        // Create the Channel to connect to the PV.

        Channel ch= ctxt.createChannel("win32:CM1:intensityM");

            // send the request and wait 5.0 seconds for the channel to connect to the PV.

        try{

            ctxt.pendIO(5.0);}

        catch(Exception ex){

           System.out.println(ex.getMessage());

        }

   

            // If we're here, then everything went fine.

            // Display basic information about the channel.

        DBR reading = ch.get();

 

        System.out.println("getValue="+reading.getValue());

        

            System.out.println(ch.getElementCount());

            System.out.println("type="+ch.get().getType());

      

            System.out.println(ch.get().getValue());

 

 

        ch.printInfo();

         // We have no clue on whether the channel has been found and connected.

        // until the connection callback is called.

        //

        System.out.println("intensityM = "+ch.get().getValue());

 

        ch.destroy();

        ctxt.destroy();

      } catch(CAException caEx) {

        System.err.println("A Error occured: "+caEx);

      }

   

 

And here is the output….

 

CLASS : gov.aps.jca.jni.SingleThreadedContext

PREEMPTIVE_CALLBACK : true

ADDR_LIST :

AUTO_ADDR_LIST : true

CONNECTION_TIMEOUT : 30.0

BEACON_PERIOD : 15.0

REPEATER_PORT : 5065

SERVER_PORT : 5064

MAX_ARRAY_BYTES : 16384

EVENT_DISPATCHER: gov.aps.jca.event.DirectEventDispatcher@19b49e6

getValue=[D@14a9972

1

type=gov.aps.jca.dbr.DBRType[DBR_DOUBLE=6]

[D@a01335

CHANNEL  : win32:CM1:intensityM

TYPE     : gov.aps.jca.dbr.DBRType[DBR_DOUBLE=6]

COUNT    : 1

STATE    : gov.aps.jca.Channel$ConnectionState[CONNECTED=2]

HOSTNAME : juno.fnal.gov:5064

READ     : true

WRITE    : true

intensityM = [D@14d3343

 

 

Anyone know what I’m doing wrong???

 

Thanks,

Sharon Lackey

 


Replies:
Re: using the JCA extension Thomas Pelaia II

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