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| Help w/ repeating group of fixed & variable length struc |
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| bradhack |
 Posted: Fri Aug 13, 2004 11:20 am Post subject: Help w/ repeating group of fixed & variable length struc |
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Newbie
Joined: 28 May 2002
Posts: 7
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I have to format a message on output consisting of the following three fields which, as a group, may repeat 0 to n times:
1. Length (4 byte field which is a calculation of the sum of the lengths of all three fields in the group)
2. Code (6 byte field which describes the field)
3. Value (Variable length field which contains the actual value)
So, for example, if I had a field code called 900010 which had a value of 63 the complete structure would look as follows (I've separated the 3 fields with spaces for readability:
0012 900010 63
The 0012 is obtained by adding the 6 byte Code + the 2 byte Value + the 4 bytes to account for the length field itself.
These 3 fields can then repeat as a group multiple times with different Codes and different Values of course:
0015020003OWNER
0018010820NEW YORK
001901042613,831.38
I've tried creating messages using both CWF and TDS physical formats, but haven't found the right combination yet. I know you can reference a field to calculate a field length, but this calculation is based on multiple fields.
I'd appreciate any suggestions. Thanks. |
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| jefflowrey |
| Posted: Fri Aug 13, 2004 12:37 pm Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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Is the group delimited in any way - like by a line ending in your example?
_________________
I am *not* the model of the modern major general. |
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| wooda |
| Posted: Mon Aug 16, 2004 7:45 am Post subject: |
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Master
Joined: 21 Nov 2003
Posts: 265
Location: UK
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Hi bradhack,
This is very very similar to TDS Tagged Encoded Length. However in TEL the tag and the encoded length are the other way around.
I have racked my brains and I am quite confident there is currently no way you can model this message in TDS (and certainly not CWF).
I suggest you raise a requirement with IBM to expand support for TDS Tagged Encoded Length.
This leaves you the following options:
Parse this in a plugin parser/node.
Write ESQL to parse this in the BLOB domain.
Or manipulate this enough in ESQL to make it parsable in TDS.
(ie iterate through the message swaping the length and code fields around) |
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