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| MQGET trouble with assigning MSGID |
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| mq_fish |
 Posted: Mon Aug 16, 2004 11:43 am Post subject: MQGET trouble with assigning MSGID |
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Newbie
Joined: 16 Aug 2004
Posts: 2
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I am working on a Client (PowerBuilder)/Server (Mainframe PL/I) application. I am having some difficulty assigning the message id using a variable into MD.MSGID. Here's a quick overview of what I'm trying to accomplish:
1) Powerbuilder is putting an asynchronous message to a LAN Remote Queue -> Local Mainframe Queue. The message id (MSG_ID) is retrieved after the PUT. This message id is a 48 character string. e.g. 414D51204D5153443120202020202020CE361F4120007711
2) Powerbuilder will then send a smaller message (containing message id MSG_ID, etc.) to fire the mainframe MQ tran. I am reading the MSG_ID into a local variable declared as follows:
| Code: |
| MESSAGE_ID CHAR(48) INIT(''); |
3) When the tran executes on the mainframe, it needs to go to the Mainframe local queue to pick up the large message. It needs to use the correct message id (i.e. MESSAGE_ID) to know which message to pick up from the Mainframe queue.
Setting MD.MSGID = MQMI_NONE will get back the first message it finds, which may be the wrong one.
If I assign (hardcode) the 48 character MSG_ID into MD.MSGID, with a Hex conversion character 'X', I am able to retrieve the correct message. e.g. MD.MSGID = '414D51204D5153443120202020202020CE361F4120007711'X. But, since the MSG_ID will be different every time, I need to assign a variable (i.e. MESSAGE_ID) into MD.MSGID.
Any suggestions/advice provided is greatly appreciated. Thanks in advance. |
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| fjb_saper |
| Posted: Tue Aug 17, 2004 5:05 am Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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Your problem is defining your message ID as a STRING.
Message Id is a byte array and contains hex values including those which could normally mark the end of a string.
Your system is correctly protesting that you are trying to assign values beyond the end of string marker.
Define your variable as being a hex value. Each hex value is represented by its value string (0-F)
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| mq_fish |
| Posted: Tue Aug 17, 2004 1:00 pm Post subject: |
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Newbie
Joined: 16 Aug 2004
Posts: 2
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Thanks for the info, I appreciate it.
I've tried declaring MESSAGE_ID as a Bit variable, but with no luck. Any ideas on how to define MESSAGE_ID as a Hex value in PL/I?
Thanks. |
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| RogerLacroix |
| Posted: Tue Aug 17, 2004 8:35 pm Post subject: |
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Jedi Knight
Joined: 15 May 2001
Posts: 3264
Location: London, ON Canada
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Dude,
IBM includes PL/I samples when you install MQ Server and the toolkit.
On the mainframe, dataset naming standard is *.*.SCSQPLIC and *.*.SCSQPLIS .
If you had a peek, you would notice that MsgID & CorrelID are defined with char(24).
Regards,
Roger Lacroix
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