Example: orders.4gl (MAIN block)

This MAIN block of the orders.4gl module is the entry point of the progam execution.

MAIN block in orders.4gl:

  1 MAIN
  2   DEFER INTERRUPT
  3 
  4   CONNECT TO "custdemo"
  5 
  6   OPEN FORM f1 FROM "orders"
  7   DISPLAY FORM f1
  8 
  9   CALL orditems_dialog()
 10 
 11 END MAIN

Note:

Line 2 declares the we defer the interruption events. If the program receives the SIGINT signal, it will continue.
Line4 establishes an SQL connection to the database identified by the custdemo data source. The SQL connection parameters are defined in the fglprofile file.
Line 6 loads the main form of the program, defined in the orders.per file compiled as orders.42f.
Line 7 displays the loaded form into the current window, which is the default SCREEN window.
Line 9 gives the control to the orditems_dialog function.