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| brandoh |
 Posted: Thu Oct 19, 2006 10:52 am Post subject: Read all messages from a queue |
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Newbie
Joined: 18 Oct 2006
Posts: 8
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Sorry for all of the dumb questions, but is there any pseudo code or code snippets out there for reading all messages from a queue? I am putting a command on SYSTEM.COMMAND.INPUT and then trying to read the messages off of the replyToQueue. I can read the first message fine, but subsequent calls of queue.get fail with a 2033, no message available.
Im assuming that I need to advance to the next message in the queue, but I have not been able to determine how to do that. |
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| zpat |
| Posted: Thu Oct 19, 2006 10:59 am Post subject: |
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Jedi Council
Joined: 19 May 2001
Posts: 5866
Location: UK
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Clear the MQMD.MSGID and MQMD.CORRELID fields to binary zeros before each MQGET.
Last edited by zpat on Thu Oct 19, 2006 11:47 am; edited 1 time in total |
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| brandoh |
| Posted: Thu Oct 19, 2006 11:08 am Post subject: |
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Newbie
Joined: 18 Oct 2006
Posts: 8
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| I see the matchOptions in the MQGetMessageOptions fields, but I see no method to set them to 0. How is this done? |
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| brandoh |
| Posted: Thu Oct 19, 2006 11:10 am Post subject: |
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Newbie
Joined: 18 Oct 2006
Posts: 8
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| Also, I should mention that this code is java, and I am using the MQ Base classes for java. |
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| zpat |
| Posted: Thu Oct 19, 2006 11:48 am Post subject: |
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Jedi Council
Joined: 19 May 2001
Posts: 5866
Location: UK
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You're the Java coder, not me!
Something like creating a new instance of a message object?
RTM.....I only know Ye Olde programming languages! |
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| brandoh |
| Posted: Thu Oct 19, 2006 11:52 am Post subject: |
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Newbie
Joined: 18 Oct 2006
Posts: 8
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I think I have found it, some obscure doc from IBM.
for (int i = 0; i < qDepth; i++){
rcvMessage.clearMessage();
rcvMessage.correlationId = MQC.MQCI_NONE;
rcvMessage.messageId = MQC.MQMI_NONE;
replyQueue.get(rcvMessage, gmo);
messages[i] = rcvMessage.readLine();
}
the clearMessage, and MQCI/MQMI_NONE seem to do the trick. |
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| jefflowrey |
| Posted: Thu Oct 19, 2006 4:10 pm Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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NO.
DO NOT LOOP OVER THE QUEUE DEPTH.
Loop Infinitely until you get an Exception that is an MQRC 2033 (No more messages!).
You will be in for a world of unexplained problems if you leave the code the way it is.
_________________
I am *not* the model of the modern major general. |
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| kevinf2349 |
| Posted: Thu Oct 19, 2006 4:47 pm Post subject: |
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Grand Master
Joined: 28 Feb 2003
Posts: 1311
Location: USA
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well maybe not toally unexplained.  but sure as eggs are eggs the next post is going to ask if any one has come across this MQ bug (Nigel....that was sarcasm  ) |
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