Return composite index information for given file
function PXKeyQuery
(IndexFileName : String; { name of file that is the index }
var FldName : NameString; { field name associated with index }
var NFields : Integer; { number of fields in comp index }
var Mode : Integer; { mode (case-sens or not) of index }
var FldHandles : FieldHandleArray; { array of field numbers in index }
var IndexId : FieldHandle): Int; { field handle for composite index }
Errors: PXERR_FILENOTFOUND 5 Could not find file
PXERR_INVFILENAME 108 Invalid file name |