MoveToId (Stringlist subroutine): Difference between revisions

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Revision as of 21:33, 18 January 2011

Move data from Stringlist to $list (Stringlist class)


This method moves data (Stringlist items) from a Stringlist to a $list. MoveToId is a subroutine that accepts one argument: the $list identifier of the $list to which data is to be moved. For more information about $list identifiers, see the Sirius Functions Reference Manual.

Syntax

sl:MoveToId( listId)

Syntax terms

sl A Stringlist object.
listid The $list identifier of the $list to which data is to be moved.

Usage notes

  • All errors in MoveToId result in request cancellation.
  • After the MoveToId method is invoked, the method Stringlist is empty, though the object variable is still valid (non-null).
  • MoveToId discards the original contents of the target $list.
  • The MoveToId method copies to the target $list any image association that is set via BindImage.
  • MoveToId simply moves the pointers to the Stringlist data to the target $list. It does not actually perform any data movement; therefore, it is extremely efficient.
  • MoveToId is intended to facilitate the migration to the use of Stringlists of existing applications that use $lists. For example, suppose complex subroutine Summarize takes a $list identifier as its input parameter. Now, suppose some code that has a Stringlist in %list wants to pass the Stringlist to Summarize. The following code illustrates how this can be accomplished:
    %listid = $listnew
    %list:moveToId(%listId)
    call summarize(%listId)
    %list:moveFromId(%listId)
    return
    

    Stringlists should always be used in preference to $lists, so MoveToId is provided only for the migration of existing $list applications to the use of Stringlists.