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| Length reference |
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| KIT_INC |
 Posted: Fri Jul 22, 2011 10:46 am Post subject: Length reference |
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Knight
Joined: 25 Aug 2006
Posts: 589
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I am learning how to model a message. My environment is WMB V61
I have a message which is just 1 byte length followed by data.
I created a CWF Message with two local elements
MSG_Length - type integer , length 1 byte
MSG_Data - type string length reference MSG_Length, Length unit character
When I parsed an Input message (2ab) using MQInput node. I hope the mrm parser will read the first byte '2' as length and expect 2 characts of data to follow (which is ab). However I got a parser error saying that the expected length is 50. I think the parser is reading the 2 as hex 32 (dec 50) and hence expect 50 characters to follow.
If this is the way the parser works, how can I do this for messages with only 2 of 3 bytes of data ? |
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| joebuckeye |
| Posted: Fri Jul 22, 2011 11:27 am Post subject: |
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Partisan
Joined: 24 Aug 2007
Posts: 365
Location: Columbus, OH
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| The character '2' is not the same thing as an integer representing the number 2. |
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| Vitor |
| Posted: Fri Jul 22, 2011 12:54 pm Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| joebuckeye wrote: |
| The character '2' is not the same thing as an integer representing the number 2. |
| KIT_INC wrote: |
| If this is the way the parser works, how can I do this for messages with only 2 of 3 bytes of data ? |
By putting an integer representation of the value 2 (or 3) as appropriate in the first byte.
Can be a bit fiddly with RFHUtil et al, but a few line of code in the language of your choice will do it fine. 
_________________
Honesty is the best policy.
Insanity is the best defence. |
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| kimbert |
| Posted: Sat Jul 23, 2011 12:50 pm Post subject: |
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Jedi Council
Joined: 29 Jul 2003
Posts: 5542
Location: Southampton
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Your message model is wrong.
You have told the parser to expect a binary integer in the first field, but your input data actually contains a text integer. You could model it as an 'external decimal' in CWF. Alternatively, use TDS to model your data - TDS assumes that your data is represented as text. |
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