Experimental Physics and Industrial Control System
Hi,
we just found the "feature" again, that in record-sections of db-files,
the DTYP field has to be set before the INP or OUT field (at least for
INST_IO), it took us an hour or two to track this down.
I didn't search for that in the AppDevGuide and other docs, since I'm
afraid (and definitely hope), I'll find that documented, since I found
tha last reference to that "feature" on tech-talk back in '99. It was
undocumented back then...
So for about 10 years, we didn't have a problem with that here at BESSY,
but the following is, what just happened:
1. A colleague created a db-file for his application with vdct
* he set the INP field of his whatever-in-record properly, but
forgot to set the DTYP at all
2. He recognizes his mistake and opens his db-file in vdct again and
sets DTYP as well
So far, everything looks good, BUT:
* When vdct writes the db-file, it puts the fields in the order in
that they were set!
Fields added in another vdct-session or after another "Open" are
appended to the list of already defined fields!
* Hence, vdct creates a db-file, that won't work at all (INP is set
before DTYP is) while looking absolutely correct (to the untrained
eye).
My first suggestion would be to change dbLoadRecords() (dbPutString(),
and/or setLinkType() in dbStaticLib.c) and remove the dependency, but I
also see, that it's a lot easier to modify vdct in a way to always write
the fields in the order they were defined in the dbd-file (or at least
write DTYP before INP or OUT).
The latter would be a workaround, that would keep us safe for the next
10 years...
Regards,
Thomas
--
______________________________________________________________________
/homas.Birke @ bessy.de
BESSY Tel: +49 30 6392 4934
Albert Einstein StraÃe 15 Fax: +49 30 6392 4859
12489 Berlin
Germany
- Replies:
- Re: order of DTYP and INP/OUT fields in db-Files and vdct Marty Kraimer
- Re: order of DTYP and INP/OUT fields in db-Files and vdct Michael Abbott
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