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| How to get a pdf into the buffer (no referance messages) |
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| jed |
 Posted: Fri Dec 31, 2004 4:31 pm Post subject: |
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Centurion
Joined: 08 Jan 2004
Posts: 118
Location: MI, USA
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Lemme get this straight.....
You're just trying to GET messages that you've PUT, right?
In order to read all the messages in a queue... You just need to do...
iMsgLen = 50;
do
{
md.MsgId = MQMI_NONE;
md.CorrelId = MQCI_NONE;
msgLen = iMsgLen;
mqGet(connH, &queueH, &md, getOpt, msgLen, msg, &iMsgLen, &compCode, &reasCode);
} until (compCode != MQCC_OK)
I hope this helps you in getting the subsequent messages from the queue.
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Jed |
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| ironface |
| Posted: Tue Jan 04, 2005 2:05 am Post subject: |
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Newbie
Joined: 28 Dec 2004
Posts: 8
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Sorry to bother You again, but I misexplained my need.
I've got a queue with 4 old message. Using an application I put one another message and want to retrieve the reply message related.
In the PUT message I use:
...
md.CorrelId = MQCI_NEW_SESSION
MQPUT gHcon, gHobj, md, pmo, buflen, Buffer, CompCode, Reason
...
In the get message
...
Struc.MatchOptions = MQMO_MATCH_CORREL_ID
MQGET gHcon, gHobj, md, gmo, buflen, Buffer, messlen, CompCode, Reason
...
The issue is that the message retrieved is the oldest instead of the related. |
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| jefflowrey |
| Posted: Tue Jan 04, 2005 5:24 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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| ironface wrote: |
In the PUT message I use:
...
md.CorrelId = MQCI_NEW_SESSION
MQPUT gHcon, gHobj, md, pmo, buflen, Buffer, CompCode, Reason
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DO NOT USE MQCI_NEW_SESSION.
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I am *not* the model of the modern major general. |
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| ironface |
| Posted: Wed Jan 05, 2005 1:27 am Post subject: |
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Newbie
Joined: 28 Dec 2004
Posts: 8
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| What should I use instead of MQCI_NEW_SESSION? |
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| kman |
| Posted: Wed Jan 05, 2005 2:54 am Post subject: |
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Partisan
Joined: 21 Jan 2003
Posts: 309
Location: Kuala Lumpur, Malaysia
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Ironface,
I think you should listen to Peter's suggestion. read the programming manual. But I take it you already did, but still got confused with all this.
I hope I can explain in a simple way.
You have two program - Sender, and Responder.
When Sender puts a request message, it either sets the messageid and/or correlid, or gets the queue manager to assigned the ids.
Keep in mind the messageid.
Once request message is received by Responder, it sends (put) a reply message into the reply queue for the Sender. During this time, the Responder copy the messageid (that what we normally do) and assign it to the correlid of the reply message.
The Sender is expecting a reply based on the messageid it sent earlier. Since the responder copied to the Correlid, your match option should be Match Correlid. When doing this, do not set the correlid at all.
Do Not use MQCI_NEW_SESSION.
First because it is wrong. Second, because that would give a totally new value, which the matching will fail.
There is a couple of sample programs that you should look for... mqsrv and mqreq that exhibit this scenario. |
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| jefflowrey |
| Posted: Wed Jan 05, 2005 5:56 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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On your PUT, specify MQCI_NONE for your Message ID AND your Correlation ID. ALSO specify MQPMO_NEW_MSG_ID.
Save the resulting Message ID.
On your GET,create a NEW mqmd, specify MQCI_NONE for your Message ID. Assign the correlation ID to the saved Message ID, and specify MQMO_MATCH_CORREL_ID in your match options.
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I am *not* the model of the modern major general. |
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| EddieA |
| Posted: Wed Jan 05, 2005 10:09 am Post subject: |
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Jedi
Joined: 28 Jun 2001
Posts: 2453
Location: Los Angeles
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| Quote: |
| On your PUT, specify MQCI_NONE for your Message ID AND your Correlation ID. ALSO specify MQPMO_NEW_MSG_ID |
Now that's the "belt and braces" approach. You only need to do one or the other.
| Quote: |
| specify MQCI_NONE for your Message ID. ... and specify MQMO_MATCH_CORREL_ID in your match options |
And again. 
Cheers,
_________________
Eddie Atherton
IBM Certified Solution Developer - WebSphere Message Broker V6.1
IBM Certified Solution Developer - WebSphere Message Broker V7.0 |
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| jefflowrey |
| Posted: Wed Jan 05, 2005 10:32 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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I've always been told that the best defense is a good offense.
So at least *occasionally*, I program offensively.
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I am *not* the model of the modern major general. |
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| kman |
| Posted: Wed Jan 05, 2005 4:35 pm Post subject: |
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Partisan
Joined: 21 Jan 2003
Posts: 309
Location: Kuala Lumpur, Malaysia
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The above are referring to the Sender program, and not the Responder. Had you chosse Jeff's earlier suggestion, i.e., MQCI_NONE for CorrelId on the Responder, your GET on the Sender will always fail.
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| jefflowrey |
| Posted: Thu Jan 06, 2005 5:26 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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| kman wrote: |
The above are referring to the Sender program, and not the Responder. Had you chosse Jeff's earlier suggestion, i.e., MQCI_NONE for CorrelId on the Responder, your GET on the Sender will always fail.
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Ahh. Responder!
Responders are a lot more complicated.
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I am *not* the model of the modern major general. |
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| ironface |
| Posted: Mon Jan 17, 2005 3:36 am Post subject: |
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Newbie
Joined: 28 Dec 2004
Posts: 8
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Jefflowrey, EddieA, Kman, you're very kind in answering my questions.
First of all I want to assure You I red the topics in the MOSeries help and the ones present in the documentation area of this site. My problem is that I'm very new in MQ so some rules are difficult to be "digested".
Jefflowery Yo specify "On your GET,create a NEW mqmd, specify MQCI_NONE for your Message ID. Assign the correlation ID to the saved Message ID"... What I'm missing is to understand where I do receive the correlID, since the MQPUT in visual basic seems it doesn't return any value.
Thanks again for your help. |
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| kman |
| Posted: Mon Jan 17, 2005 6:29 pm Post subject: |
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Partisan
Joined: 21 Jan 2003
Posts: 309
Location: Kuala Lumpur, Malaysia
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| Quote: |
| What I'm missing is to understand where I do receive the correlID, since the MQPUT in visual basic seems it doesn't return any value. |
| Code: |
' Setup MQMD and MQPMO to their respective
' initial values
MQMD_DEFAULTS pmd
pmd.Format = MQFMT_STRING
MQPMO_DEFAULTS pmo
' Get message to be "put" from the Put text box
buflen = Len(txtPut.Text)
Buffer = txtPut.Text
MQPUT gHcon, gHobj, pmd, pmo, buflen, Buffer, CompCode, Reason
cboAPIRC.AddItem "MQPUT: CompCode = " + Str(CompCode) + ", Reason Code = " + Str(Reason), 0 |
The pmo - put message option is here assumed to be defaults. This could mean MQPMO_NEW_MSG_ID, and MQPMO_NEW_CORREL_ID.
If you want to be sure, add these statement during your put.
pmo.Options = MQPMO_NEW_MSG_ID + MQPMO_NEW_CORREL_ID
You can print out on the display text for your message id and correlid.
textDisplayMsgId = pmd.MessageId
textDisplayCorrelId = pmd.CorrelId
The above are for the Sender program. In your Responder, follow Jeff's suggestion. So instead of using defaults, you set the correlId from the received message id. Much like;
| Code: |
pmd.CorrelId = gmd.MessageId 'this is the msg id from your get' |
Then again, in your Sender, while getting for the reply, use the match correlid in the gmo.
| Code: |
gmo.MatchOptions = MQGMO_MATCH_CORREL_ID
gmd.CorrelId = pmd.MessageId 'this is the original put message id'
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These bits of codes, I hope will help you to understand all this. I do not have a VB on my machine, so the above codes are not verified, but should be correct. Unless someone wants to verify this. |
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| ironface |
| Posted: Thu Jan 20, 2005 8:16 am Post subject: |
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Newbie
Joined: 28 Dec 2004
Posts: 8
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| Finally I succeded. Thanks a lot to all. |
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