QTIPS - Descending Order Quickdex/Rightdexes [Revelation On-Line Wiki]

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====== QTIPS - Descending Order Quickdex/Rightdexes=====

^Published By^Date^Version^Knowledge Level^Keywords^
|Sprezzatura Ltd|01 APR 1992|2.11+|EXPERT|QUICKDEX, RIGHTDEX, MFS, LRDEX.SUB, DESCENDING|

If it is ever required to quickdex or rightdex a file in descending order
this may be accomplished using the system subroutine LRDEX.SUB. This is
essentially an MFS shell with one extra parameter at the end - the sort
order. The calling parameters are

Lrdex.Sub(Code,BFS,Handle,Name,FMC,Record,Status,S_Order)

Thus to add a descending rightdex to a file one could create an MFS as
follows

      Subroutine DR_MFS( A, B, C ,D, E, F, G)
       call lrdex.sub(a,b,c,d,e,f,g,"DR")
      Return


Then add DR_MFS as the last multivalue of attribute 2 of the REVMEDIA
record. Note that this is the simplest form of MFS shell possible -
additional logic could easily be built in to exclude specific records from
the sorted list etc.


(Volume 3, Issue 10, Page 4)