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QTIPS - MFS - Select.IndexOwners of the new "Modifying Filing System" book from RevTI will be aware that it is now possible to query an MFS to see if it is capable of a specific type of search, so that the programmer does not have to encode the logic him/herself. This is achieved by calling the filing system as in the following code example 0001 OPEN "MEMBER" TO PRIMARY_FILE_VAR THEN 0002 BFS = PRIMARY_FILE_VAR<1,1> ; N_FS = BFS<1,1,1> 0003 HANDLE = DELETE( PRIMARY_FILE_VAR, 1, 1, 0 ) 0004 NAME = "FAMILY_NAME" ; FMC = @FM :@FM : @FM : 1 0005 RECORD = 7 ; STATUS = 0 0006 CALL @N_FS(33,BFS,HANDLE,NAME,FMC,RECORD,STATUS) 0007 END Here the NAME is set to the dictionary item to check, the FMC to a case insensitive flag, RECORD to a code indicating the type of search to check for (7 is GT) and STATUS to 0 indicating a test call. Whilst the documentation records that the results will be returned in RECORD they are in fact returned in FMC. (Volume 4, Issue 8, Pages 12,13) |
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