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| MTI. Not all the buffer was used when reading message |
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| Gralgrathor |
 Posted: Fri Sep 24, 2010 5:32 am Post subject: MTI. Not all the buffer was used when reading message |
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Master
Joined: 23 Jul 2009
Posts: 297
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Hi,
I am using an embedded message structure to receive data from a
mainframe application. The header is defined by a copybook, and
identifies the following messageset and type. There is currently only one
messagetype in use, which is also described by a copybook.
This messagetype contains "OCCURS... DEPENDING ON...", meaning that
the length of the data is variable and cannot be known up front.
Which is a problem, because the mainframe application sends its
messages using a fixed length buffer, initialised to the same character
that represents a null-value in the message.
Entirely predictable, this leads to messages like
| Code: |
| BIP5288E: An MRM parsing error has occurred. The bit stream of the message being parsed by the MRM parser is larger than expected for a message of this type. |
What annoys me is that there is a fully parsed model of the message in
the Root at the time the exception occurs, but that there's no way of
accessing this data without triggering another exception...
Does anybody know of a way to circumvent this problem without
changing the mainframe application sending the messages?
Thanks! |
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| Vitor |
| Posted: Fri Sep 24, 2010 5:57 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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Either open a 4 year old post or open a new one. Don't do both. 
_________________
Honesty is the best policy.
Insanity is the best defence. |
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| mqjeff |
| Posted: Fri Sep 24, 2010 6:13 am Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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You should be able to set a trailing, optional field that either repeats or has a length to the end of the message and matches the null padding.
There are specific conditions in CWF for the last field to have unknown repeats or to have length to the end of the bitstream, at least in 6.1 and later. |
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| Gralgrathor |
| Posted: Fri Sep 24, 2010 7:05 am Post subject: |
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Master
Joined: 23 Jul 2009
Posts: 297
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| mqjeff wrote: |
You should be able to set a trailing, optional field that either repeats or has a length to the end of the message and matches the null padding.
There are specific conditions in CWF for the last field to have unknown repeats or to have length to the end of the bitstream, at least in 6.1 and later. |
I've tried adding an element to the Message Definition Editor, with minOccurs=0, maxOccurs=10000, fixed length=1, but this results in a
| Code: |
| CPI Text Buffer Input Data Too Short |
How would you add such a trailer-element?
Sorry I asked: just found the End-Of-Bitstream option. |
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| Amitha |
| Posted: Fri Sep 24, 2010 7:12 am Post subject: |
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Voyager
Joined: 20 Nov 2009
Posts: 80
Location: Newyork
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| Quote: |
| I've tried adding an element to the Message Definition Editor, with minOccurs=0, maxOccurs=10000, fixed length=1, but this results in a |
If you specify max occurs of 10000 the cwf parser expects that many occurrences of trailer element. you would be better off using maxoccurs of -1. |
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| kimbert |
| Posted: Sat Sep 25, 2010 11:07 am Post subject: |
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Jedi Council
Joined: 29 Jul 2003
Posts: 5542
Location: Southampton
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| Quote: |
| just found the End-Of-Bitstream option. |
Good. That's the one you need.
| Quote: |
If you specify max occurs of 10000 the cwf parser expects that many occurrences of trailer element. you would be better off using maxoccurs of -1.
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As a developer who has worked on the MRM parser, I can confirm that Amitha is spot-on there. But don't use that technique anyway - End of Bitstream is what you need. |
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