Re: Data Queues

To the Toolbox, each entry on the Data Queue is just a stream of bytes or all
text.  When you read an entry from the DataQueue object you get a DataQueueEntry
object.  From DataQueueEntry you getData() or getString().  If you call
getString(), the Toolbox assumes the data is all text and converts it from
EBCDIC to unicode before putting it in the String object.  If you call
getData(), the Toolbox just hands you a byte array with the data it read off the
queue.  Your code extracts the data.  You can use a Toolbox Record object or
pull the data out using simple converters.  In your case I think the Record
object is probably more work than you need.  It would be easier to use the
AS400Text object to convert the bytes into a String.

David Wall
AS/400 Toolbox for Java


"Richard Dean" <rddean@gdi.net> on 08/19/99 02:14:57 PM

Please respond to JAVA400-L@midrange.com

To:   JAVA400-L@midrange.com
cc:
Subject:  Data Queues





I have a question about Data Queues.  I have been experimenting with the
Java tool box and have been able to successfully write to and read from the
AS/400 data queue.  I would like to be able to write to the data queue with
a CL program, and then have the Java Client read from it.  Is there a
special format for writing to the data queue that the CL must use in order
for the Client to be able to read it correctly.  I would thing not, but
after looking at the sample code below, which describes the data in the
queue, I began to wonder.

// First create the base data types.
CharacterFieldDescription userId =
   new CharacterFieldDescription(new AS400Text(8),  "USER_ID");
CharacterFieldDescription userName =
   new CharacterFieldDescription(new AS400Text(20), "USER_NAME");

// Build a record format and fill it with the base data types.
RecordFormat dataFormat = new RecordFormat();
dataFormat.addFieldDescription(userId);
dataFormat.addFieldDescription(userName);

Would I just write out 28 bytes with the first 8 bytes being User Id and the
last 20 being User Name.  Or is there some kind of identification that I
have to give to the two fields like I did above in the Java program(USER_ID,
USER_NAME),  Also does anyone know the CL calls to write to/read from the
data queue.

Thanks
Richard Dean



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