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| encoding/copying of mqrfh2 header |
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| fde |
 Posted: Wed Apr 09, 2008 3:38 am Post subject: encoding/copying of mqrfh2 header |
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Acolyte
Joined: 05 Jul 2007
Posts: 65
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Hi folks,
environment:
WMB 6.1, MQ 6 on AIX 5.3
During my flow, I create a mqrfh2 header and insert name-value pairs in the usr folder of mqrfh2. Other fields of mqrfh2 are populated automatically, e.g. the mcd folder. Than the message is written to a queue using mq-output.
If I look at my message using RFHUtil I can see all fields of the mqrfh2header. If I save the message to a file with RFHUtil and open the file in an editor, I can see the rfh2folders too (<mcd>xyz</mcd>...).
Now in my AIX programm, which issues an mqget, I dont find any readable strings in the headersection. Only the message data is readable.
Message
-MessageBroker Propertiesheader
-MQMD (Codepage=850)
-MQRFH2(Format=MQSTR)
-MRM
I want to copy the mqrfh2 header into another message to invoke another flow which expects the mqrfh2 header.
To copy the header, IMO I need either tags, to identify the header, or a structure description of the mqrfh2 header.
Due to the dynamical content of mqrfh2 (different strings in mcd and usr folders), I should not be able to create such a structure description.
Do you have any suggestions regarding the format of mqrfh2 or how to copy mqrfh2?
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| Vitor |
| Posted: Wed Apr 09, 2008 3:44 am Post subject: Re: encoding/copying of mqrfh2 header |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| fde wrote: |
Now in my AIX programm, which issues an mqget, I dont find any readable strings in the headersection. Only the message data is readable.
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Worth underlining that the only "header" returned by an MQGET call is the MQMD; the RFH2 will be in the message buffer with the application data. If the data's truely unreadable (remembering that part of it is not text anyway!) check the RFH2's data CCSID is set correctly.
The variable part of the RFH2 (mcd, usr, etc) is always directly after the fixed portion of the header, which itself contains the length of the variable portion. You don't mention what you're running on AIX but if it's non-Java consider using XMS to handle the RFH2. Or JMS if it's Java.
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Honesty is the best policy.
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| fde |
| Posted: Wed Apr 09, 2008 5:19 am Post subject: Re: encoding/copying of mqrfh2 header |
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Acolyte
Joined: 05 Jul 2007
Posts: 65
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| Vitor wrote: |
Worth underlining that the only "header" returned by an MQGET call is the MQMD; the RFH2 will be in the message buffer with the application data. If the data's truely unreadable (remembering that part of it is not text anyway!) check the RFH2's data CCSID is set correctly.
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Thanks for clarification. I found the dynamical part of rfh2 (usr, mcd folders) readable using tools like rfhutil. Being able to substring or indexof the readable part would be sufficient for my requirements.
I am not so familar with CCSID. Is there a "correct" value for CCSID for a specific system like iSeries?
Currently the CCSID field of mqrfh2 contains '1208' which i googled to "UTF-8 with IBM PUA". What would I use for a german iSeries system?
| Vitor wrote: |
The variable part of the RFH2 (mcd, usr, etc) is always directly after the fixed portion of the header, which itself contains the length of the variable portion. You don't mention what you're running on AIX but if it's non-Java consider using XMS to handle the RFH2. Or JMS if it's Java. |
I missunderstanded something. The program is running on iSeries not AIX and is written in RPG.
The part of the program, which accesses the queue seems to use a native MQGET. One of the MQGET parameters contains the MQGMO_CONVERT mentionend in http://publib.boulder.ibm.com/infocenter/wmqv6/v6r0/index.jsp?topic=/com.ibm.mq.csqzak.doc/js00862.htm
_________________
Global warming is an unintentional side effect of SOA's hotness.
-- http://soafacts.com/
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| Vitor |
| Posted: Wed Apr 09, 2008 5:58 am Post subject: Re: encoding/copying of mqrfh2 header |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| fde wrote: |
I am not so familar with CCSID. Is there a "correct" value for CCSID for a specific system like iSeries?
Currently the CCSID field of mqrfh2 contains '1208' which i googled to "UTF-8 with IBM PUA". What would I use for a german iSeries system? |
I know neither iSeries nor German.
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| jefflowrey |
| Posted: Wed Apr 09, 2008 6:01 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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The CCSID of the MQRFH2 indicates the CCSID of the *next* section of the message, in this case your message body.
The NameValueCCSID of the MQRFH2 indicates the CCSID of the variable length section, which can only be in one of a few different codepages (1208 is one).
If your RPG program is not expecting the MQRFH2, then it's trying to read that as your message data. This is likely causing problems.
If your RPG program *is* expecting the MQRFH2, and doing the right things to process it, then the convert should be doing the "right" things with your data.
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| fde |
| Posted: Wed Apr 09, 2008 6:53 am Post subject: |
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Acolyte
Joined: 05 Jul 2007
Posts: 65
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I solved something. You guys are great!
I messed around in the debugsession, trying out different CCSID values.
CCSID 273 (http://www-306.ibm.com/software/globalization/ccsid/ccsid273.jsp)
ends up readable from the folder section on in the RGP program.
Now I am able to work with the rfh2header, especially searching for the end of the rfh2 header.
Minor issues remain, like why are there 2 blanks between mqrfh2 and the message data (Headers have always a length of a multiply of 4?).
Anyway, thanks for valuable input!
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Global warming is an unintentional side effect of SOA's hotness.
-- http://soafacts.com/
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| EddieA |
| Posted: Wed Apr 09, 2008 9:32 am Post subject: |
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Jedi
Joined: 28 Jun 2001
Posts: 2453
Location: Los Angeles
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| fde wrote: |
| Headers have always a length of a multiply of 4? |
Yes.
But there is also a length field, in the RFH2, that tells you how long the complete header is, without having to "deduce" the end.
Cheers,
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Eddie Atherton
IBM Certified Solution Developer - WebSphere Message Broker V6.1
IBM Certified Solution Developer - WebSphere Message Broker V7.0 |
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