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| Problem with MQRFH2 parser |
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| nize |
 Posted: Wed Mar 17, 2010 5:13 am Post subject: Problem with MQRFH2 parser |
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Voyager
Joined: 02 Sep 2009
Posts: 90
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Hi,
I have a problem using the MQRFH2 parser of WMB 6.1.0.5. The background is that I am parsing a message having an MQMD, XQH, zero or one MQMDE, zero or more MQRFH2 headers and then a payload.
The following code successfully creates a branch OutputRoot.XMLNSC.logMsg.MQRFH2:
| Code: |
create lastchild of OutputRoot.XMLNSC.logMsg DOMAIN 'MQRFH2' PARSE(
blobPtr
ENCODING encodPtr
CCSID ccsidPtr); |
However, I get no data when I try to access
| Code: |
| DECLARE MQRFH2Length INTEGER OutputRoot.XMLNSC.logMsg.MQRFH2.Struclength; |
But MQRFH2Length is assigned the value 2 when I use the line:
| Code: |
| DECLARE MQRFH2Length INTEGER OutputRoot.XMLNSC.logMsg.MQRFH2.Version; |
When debugging I believe all fields according to the MQRFH2 specification (including the variable section) appear in the eclipse "variable" section except for Struclength and Strucid.
Could it be a bug in the MQRFH2 parser?
Extra background:
I have checked that the blob being parsed really contains these two values. This I did by creating a message set based on the C header file for the MQRFH2 header and parsing in the MRM domain. Using this parser I access the correct values of the StrucId and the Struclength fields. However, it is not as straigh-forward creating a MRM parser for the variable part of the MQRFH2 and this is why I am trying with the parser which is build-in in WMB. If I dont find any other solution I guess I will parse the MQRFH2 header two times, the first time accessing the Struclength using the MRM domain and the next time accessing the variable part using the MQRFH2 domain.
I see in http://publib.boulder.ibm.com/infocenter/wmbhelp/v6r0m0/topic/com.ibm.etools.mft.doc/ad09730_.htm that StruchLength nor StrucId are listed as required for the parsers MQRFH2 and MQRFH2C, but I dont know what that means.
Thanks in advance! |
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| kimbert |
| Posted: Wed Mar 17, 2010 6:37 am Post subject: |
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Jedi Council
Joined: 29 Jul 2003
Posts: 5542
Location: Southampton
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So you want OutputRoot to look like this:
| Code: |
OutputRoot
MQMD
XQH
MQMDE
(MQRFH2)*
XMLNSC |
Your code seems to be attempting to create this:
| Code: |
OutputRoot
MQMD
XQH
MQMDE
XMLNSC
MQRFH2
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Parsers cannot be nested in this way. If the message needs to be written by a sequence of different parsers then you need to set up a chain of header parsers followed by a chain of body parsers with all of them being direct children of OutputRoot. |
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| nize |
| Posted: Wed Mar 17, 2010 6:49 am Post subject: |
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Voyager
Joined: 02 Sep 2009
Posts: 90
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Hi,
The problem does not occur when I try to serialize (i.e. generating a message to the output queue) but when I am parsing the binary stream to logical fields. So where I put them in the current nodes OutputRoot tree really is not the problem. I will have compute nodes after preparing for the serialization. I guess you could see it as misleading that I call one of the branches in the temporary structure XMLNSC. 
So, instead, my problem is that when I am parsing I dont get ALL the fields contained in the MQRFH2 header. |
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| kimbert |
| Posted: Wed Mar 17, 2010 7:00 am Post subject: |
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Jedi Council
Joined: 29 Jul 2003
Posts: 5542
Location: Southampton
|
| Quote: |
| I guess you could see it as misleading that I call one of the branches in the temporary structure XMLNSC. |
If you create a direct child of OutputRoot and give it the name 'XMLNSC' it automagically gets assigned to the XMLNSC parser. Same goes for any other built-in parser name ( 'MRM', 'MQRFH2' ). This does not happen in the other trees ( Environment, LocalEnvironment, ExceptionList ).
It *is* misleading, but more to the point, I cannot see any advantage to putting it under OutputRoot.XMLNSC. Why not put it into LocalEnvironment ( and use CREATE...DOMAIN 'MQRFH2', of course)?
I don't know why the MQRFH2 parser is not putting those two fields into OutputRoot, but I'm reluctant to think very hard about it until I see it failing under more normal circumstances |
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