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Compare bytes in two DBs, using SCL

Created by: PetrovSI82 at: 2/3/2010 10:16 PM (5 Replies)

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2/3/2010 10:16 PM	Rate (0)
PetrovSI82 Posts: 17 Rating: (0)	Hi! I am working on project where I need to compare parameter values from two the same DBs. I am planing to do this, like: 1. Comparing byte by byte (first byte from DB1 with first byte from DB2) 2. If byte are equal -> move to second bytes and compare it; do this until byte become not equal 3. If bytes are not equal then, tell me bytes location (BytePointer- integer value for bytes location) 4. This BytePointer will tell me which parameters are not equal 5. I need a look-up table for parameters (param location in bytes + param. lenght) 6. Continue with byte comparing-> move to next byte My questions: How to compare bytes, and how to move to next byte when previous is checked? I was thinking to use "AT" for making a simbol name which is type "byte". With using for loop i will moves through bytes, and with "if" and "continue" the loop will be stopped to check look-up table. I will be grateful of any kind of suggestion!!! THX Peter
PetrovSI82 Posts: 17 Rating: (0)
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2/4/2010 7:18 AM	Rate (0)
Aret Posts: 2348 Rating: (265)	FC1 : INT for i:=1 to xxx do if BYTE_TO_INT(db1.dbb[i]) <> BYTE_TO_INT(db2.dbb[i]) then FC1:=i; return; end_if; end_for;
Aret Posts: 2348 Rating: (265)
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This contribution was helpful to 1 thankful Users how come

2/4/2010 12:22 PM	Rate (0)
PetrovSI82 Posts: 17 Rating: (0)	Thanks Aret! I mean, it is not necessary to doing "byte_to_int" conversion Also, i want to access to DB using symbols name. Example: OriginDB.dbb[i] but complier generates an error.
PetrovSI82 Posts: 17 Rating: (0)
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2/4/2010 1:22 PM	Rate (0)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 1/4/2026 Posts: 12479 Rating: (2722)	Hello Petrov; If you are using symbols, you must use symbolic names for the ".dbb1" prt of the address too. EExample: MyDB.dbb1 is not permitted; it mixes addressing types DB20.dbb1 is OK, it uses absolute addresing MyDB."firstbyte" is OK, it uses symbolic addressing If you want to compare bytes that are not defined sybolically in your DBm you must use absolute addressing. Hope this helps, Daniel Chartier

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2/4/2010 2:00 PM	Rate (0)
PetrovSI82 Posts: 17 Rating: (0)	OK! How i have to define "firstbyte" to used it in for loop -> for moving to next byte! Thx!
PetrovSI82 Posts: 17 Rating: (0)
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2/8/2010 4:49 PM	Rate (0)
PetrovSI82 Posts: 17 Rating: (0)	I found solution for my problem, with my own function for reading byte in defined DB! Anyway, Thanks everybody
PetrovSI82 Posts: 17 Rating: (0)
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