isCOBOL Evolve : Appendices : Library Routines : WOW Routines
WOW Routines
The WOW library routines allow customization and handling of the COBOL-WOW graphical user interfaces.
Routine
Feature
removes a bitmap from memory
loads a bitmap into memory
starts the buffering of video updates
flushes the buffered video updates
Note - the above routines are supported only by isCOBOL, they were not present in the RM/COBOL runtime. Refer to Supported API functions for the list of WOW routines that are supported by both isCOBOL and RM/COBOL.
Examples:
Example - Load 100 items in a ListBox with buffering
...
WORKING-STORAGE SECTION.
   COPY "windows.cpy".
 01 LIST-ITEM.
    03 FILLER PIC X(5) VALUE "Item-".
    03 ITEM-I PIC 9(3).
...
PROCEDURE DIVISION.
...
   CALL WOWSTARTBUFFERING USING WIN-RETURN.
   CALL WOWSETPROP USING WIN-RETURN LIST1 "VISIBLE" 0.
   PERFORM VARYING ITEM-I FROM 1 BY 1 UNTIL ITEM-I > 100
       CALL WOWADDITEM USING WIN-RETURN LIST1 LIST-ITEM
   END-PERFORM.
   CALL WOWSETPROP USING WIN-RETURN LIST1 "VISIBLE" 1.
   CALL WOWSTOPBUFFERING USING WIN-RETURN.