1. ABAP Programming MINS298c Fall 1998

2. Overview • Hiding in ABAP • Primitive Pagination • ABAP does Windows • Making Messages • Assignments

3. Hiding in ABAP (p.366) • Hide Command • temporarily stores variables • Hide Area related by line number • recalled at AT LINE-SELECTION event Hide area Display area Write: / airline, fnumber. Hide: / airline-cost. airline-cost airline-cost airline-cost airline-cost airline-cost airline-cost airline fnumber airline fnumber airline fnumber airline fnumber airline fnumber airline fnumber

4. Hiding in ABAP • Hide Command • temporarily stores variables • Hide Area related by line number • recalled at AT LINE-SELECTION event Hide area Display area Write: / airline, fnumber. Hide: / airline-cost. AT LINE-SELECTION write: / airline-cost. airline-cost airline-cost airline-cost airline-cost airline-cost airline-cost airline fnumber airline fnumber airline fnumber airline fnumber airline fnumber airline fnumber cursor >

5. Primitive Pagination (p.374) • Language Dependent • Headers & Labels • Default • one “logical page” of 60,000 lines • list header from text elements - Title and Heading • Overrides • Events: TOP-OF-PAGE: END-OF-PAGE: NEW-PAGE • “NO STANDARD PAGE HEADING” clause • LINE-COUNT clause

6. ABAP does Windows (p364) • Window command • starting at x1 y1 • ending at x2 y2 1 X 80 1 Y 24

7. ABAP does Windows (p364) • Window command • starting at 10 10 • ending at 20 20 1 x1 x2 80 1 y1 y2 24 10 20 10 20

8. Making Messages (p.440) • Message Types • a - abnormal end ABEND; no chance to correct • e - error; cannot continue asks for possible correction • w - warning; choice to continue or re-enter data • i - information; display only • s - success; displays message • Message command • MESSAGE messid • The ‘&’ sign represents variables for the message from the program

9. Message Example 001 Wrong entry & 001 my_name = ‘Bne’. if my_name ne ‘Ben’. MESSAGE e001 my_name. endif. e001 Wrong entry Bne cont new

10. Assignments • Add the code necessary to the currency program to catch the currencies that do not convert and to print these on a separate page so that the output appears on multiple pages. Use the new-page, end-of-page, and top-of-page events • Change the currency program to send an error message to the user as appropriate when the exchange rate does not exist for a currency.

11. Possible Presentation Topics • AT USER COMMAND • GUI Design • Variants • Dialog boxes - List of useful ones • List of events - List of most used • Field Symbols • AT CURSOR • Frames • Logical Databases • Uploading and downloading files • ABAP Query • Using Object Browser to develop a program • Demonstrating efficiency of conditionals • User and formula exits