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| Browsing beyond first message in C# |
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| jdmcfadden |
 Posted: Fri Oct 10, 2003 3:10 pm Post subject: Browsing beyond first message in C# |
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Newbie
Joined: 10 Oct 2003
Posts: 3
Location: Calhoun, GA
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Based on rampant Googling, this seems like an old question, but nothing I've run across has worked yet . . .
Using C# and the AMQMDNET library, I would like to be able to browse beyond the first message in a queue. But I always get the first message back regardless. My code looks like this (assume a connection to the manager is already established):
MQMessage mqMsg = new MQMessage();
MQGetMessageOptions mqMsgOpts = new MQGetMessageOptions();
int openOptions = IBM.WMQ.MQC.MQOO_INPUT_AS_Q_DEF +
IBM.WMQ.MQC.MQOO_FAIL_IF_QUIESCING +
IBM.WMQ.MQC.MQOO_BROWSE;
MQQueue q = null;
q = m_qMgr.AccessQueue(m_queueName, openOptions +
QC.MQOO_INQUIRE);
mqMsgOpts.Options += IBM.WMQ.MQC.MQGMO_BROWSE_NEXT;
mqGetMsgOpts.WaitInterval = 15000;
q.Get(mqMsg, mqMsgOpts); |
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| oz1ccg |
| Posted: Sat Oct 11, 2003 6:02 pm Post subject: |
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Yatiri
Joined: 10 Feb 2002
Posts: 628
Location: Denmark
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Hmm ....
what are you meaning.... ????
Every time you start the program it starts from the beginning of the queue. Then it's up to you (using a loop) to browse thru the queue, right ?
Second, before every get you have to clear msgid and corrid to prevent WMQ to get using these options. If WMQ uses the mqgid/corrid of the first message the it will take message number o..
this should work... but keep
| Quote: |
| mqMsgOpts.Options += IBM.WMQ.MQC.MQGMO_BROWSE_NEXT |
outside your loop  (I've seen it inside a loop and the developer couldn't see what was wong but tshe got some unexpected errors)
Just my $0.02 
_________________
Regards, Jørgen
Home of BlockIP2, the last free MQ Security exit ver. 3.00
Cert. on WMQ, WBIMB, SWIFT. |
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| jdmcfadden |
| Posted: Mon Oct 13, 2003 3:26 am Post subject: |
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Newbie
Joined: 10 Oct 2003
Posts: 3
Location: Calhoun, GA
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OK, I will try clearing the messageID before calling BROWSE_NEXT. I don't know what the corrid is; is it the same thing as the messageID?
The reason I'm not using a loop, per se, is that the app needs to browse the queue interactively; the user might want to go one message deep or 5 messages. I was hoping to be able to just let them click a "Next Message" button and keep bringing back stuff until they were done. I don't have a need to get bunches of messages at once. If I have to, I suppose I could do so and cache them, but it seems like a lot of potentially wasted transactions.
Thanks for the help. |
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| jdmcfadden |
| Posted: Mon Oct 13, 2003 6:30 am Post subject: |
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Newbie
Joined: 10 Oct 2003
Posts: 3
Location: Calhoun, GA
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OK, problem solved.
I was opening the queue and closing it again each time, and, as you quite properly said, opening the queue sets everything to the beginning. Once I stopped that and used a single browse connection, I could peek at all the messages I wanted.
The reason the loop idea confused me is that I hadn't needed a loop to move from one message to the next while peeking when I used the ActiveX control. And, as it turns out, I don't need one here: Some internal cursor in MQ's library keeps track of moving me forward, so that I can just call the BROWSE_NEXT until I run out of messages or get bored, whichever comes first.
Thanks for your help. |
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