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try the QDBRTVFD API to retrieve the key field information.
Here's the procedure definition I use:
* List Key Fields (QDBRTVFD retrieve file desc)API Procedure
DListFileDesc pr ExtPgm('QDBRTVFD')
d OutputData 32766a Options(*Varsize)
d OutputDataLen 10i 0 Const
d CUSPFNameRet 20a
D PFRcdFmt 8a Const
d CUSPFName 20a Const
D RcdFmt 8a Const
d OverrideProc 1a Const
d System 10a Const
d FormatType 10a Const
d ErrorCode 32766a options(*varsize)
* List File Description Header DS
D FDHDS ds
D FDHBytesRet 10i 0
D FDHBytesAvail 10i 0
D FDHMaxKeyLen 5i 0
D FDHKeyCount 5i 0
D FDHReserved 10a
D FDHFormatCnt 5i 0
D KeyRecFmt 10a
D KeyReserve 2a
D Key#OfKeys 5i 0
D KeyReserv1 14a
D KeyInfoOffset 10i 0
* List Key Information DS
D KeyDS ds
D KeyIntName 10a
D KeyExtName 10a
D KeyDtaType 5i 0
D KeyFldLen 5i 0
D Key#OfDigits 5i 0
D KeyDecPos 5i 0
D KeyAttrFlg 1a
D KeyAltLen 5i 0
D KeyAltName 30a
D KeyReserv3 1a
D KeyAttrFlg1 1a
D KeyReserv4 1a
c CallP(E) ListFileDesc(OutputData:
c OutputDataLen:
c CUSPFNameRet:
c 'FILD0300':
C CUSPFName:
c RcdFmtName:
c OverrideProc:
c '*LCL':
c '*EXT':
c ErrorDS)
* If Any Errors Occur or No Key Fields Found, Set Number Of Keys To 0
c If OutputData=*Blanks
C OR %Error
c OR %len(%Trim(OutputData))=0
c Eval Key#OfKeys=0
c Else
c MoveL OutputData FDHDS
c EndIf
* Process Key Information Stored in the OutputData Variable
c Eval StrPos=KeyInfoOffset+1
c Do Key#OfKeys
c Eval KeyDS=%Subst(OutputData:StrPos:
c +%Size(KeyDS))
Anyway you should be able to adapt this code for your pgm....
Thanks,
Tommy Holden
-----Original Message-----
From: Tony Carolla [mailto:carolla@xxxxxxxxx]
Sent: Thursday, September 23, 2004 10:51 AM
To: rpg400-l@xxxxxxxxxxxx
Subject: Key field info
I have written a quick little app to list the fields in a physical
file, using the QUSCRTUS, QUSPTRUS, QUSLRCD and QUSLFLD APIs. The
fields are placed in a subfile, and listed for the user. It's
basically like DSPFFD, without all the extra 'stuff' that I don't
usually need to see at a glance. Neato.
I would like to also indicate which fields are key fields, and what
order these key fields are in. I can't see which API would help me
with this detail. I don't see any option on the QUSLFLD API to show
this, nor on the QUSLRCD API.
Also, I don't see a way of knowing how many fields are returned from
the QUSLFLD API. I currently have a DS based on a POINTER to the user
space, and I increment the pointer after each field retrieval to the
subfile. I test the first character of the field name for containing
an alpha character, and if it does not, I assume I have reached the
end of the loop. Kind of messy, but it works. Is there a better way?
TIA
Tony Carolla,
Programmer/Analyst
MedAmerica Billing Services, Inc.
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