MQSeries.net :: View topic - How to identify messages before retrieving

Rohitash · Posted: Thu Oct 06, 2005 8:08 pm Post subject:

Hi
I want to set some parameter of the messages before putting them in the queue( like correlationID). When i retrieve the messages, i want to check this parameter and retrieve all the messages based on this information in the message header. I tried setting different correlation ids for different messages and wrote a program to retrieve all the messages having the same correlation ID. It is working. The correlation ID is being set in the following way:-

While Sending:-
MQMessage hello_world1.writeString( "One last try000");
String corrId= "Accounts";
byte[] b1 =corrId.getBytes();
hello_world1.correlationId= b1;

While recieving :-
byte[] correlationId1 = retrievedMessage1[icount].correlationId;
strCorrelationId1 = new String(correlationId1).trim();

I want to know if i can do the same task with some other parameter of the message header for eg:- groupId, applicationIdData,etc. I tried doing it with groupId and applicationIdData. While reading the message, it contains a blank value for both groupId and applicationIdData. So i am unable to compare them with a String value.

The second problem is that when I get a messageId, it is in byte[] form. When i convert it to string, i tried two ways:-

1)
messageId = retrievedMessage1icount].messageId.toString().trim();
The first one gives a value which is something like
message Id:[B@a20892
String message Id:[B@a20892

2) //messageId = new String(retrievedMessage1[i].messageId).trim();
The second one gives a messageId consisting of junk characters.

Which of the follwoing is used to get the messageId and store it to identify the message? Do we convert it to string or is there some other way of dealing with it?

Please help me with this problem.

_________________
Thanks and regards
Rohitash Laul