Customize StartDataDigger

This hook is called when you start or stop a DataDigger window. Within one session you can start multiple DataDigger windows. On starting, this hook is called with parameter piNumber = +1 and on close with piNumber = -1.

A useful example would be to check on the existence of a certain file that indicates maintenance to the database:

  /* Check if we are allowed to start */
  IF piNumber = 1 
    AND SEARCH('db-maintenance.txt') <> ? THEN 
  DO:
    MESSAGE 'Sorry, db is in maintenance, please try again later' VIEW-AS ALERT-BOX.
    QUIT.
  END.  

When starting, and the file is found:

After this, the session quits.