HP RPG/XL Programmer's Guide (30318-90001)

4- 14

Figure 4-8. Displaying Function Key Labels

Comments

1 This line defines the array, KEYLBL, that contains the function

key label text. There are 8 labels in the array, each label

containing 16 characters.

2 This line enables the function keys F4 , F7 and F8 . It

also displays the function key labels saved in the KEYLBL array.

3 This line is the last line of Output Specifications. Following

this line are the contents of the function key labels array

(KEYLBL).

Using Escape Sequences

Escape sequences let you perform many terminal-handling functions for

which there is no corresponding RPG language facility. For example, you

can use escape sequences to set graphics mode, move the cursor and reset

the terminal.

The Calculation Specification operation, DSPLY, can be used to "display"

escape sequences. You enter an escape sequence literal in the Factor 1

Field of a Calculation Specification. Figure 4-9 shows how to use escape

sequences to home the cursor, clear the screen and release a memory lock.

Instead of entering the escape sequences as literals in your program, you

can enter them into a message file (see the next section for information

on message files).

1 2 3 4 5 6 7

678901234567890123456789012345678901234567890123456789012345678901234

E* FUNCTION KEY LABEL ARRAY

E* KEYLBL 1 8 16

C .

C KEYLBL SET

KEYLBL ARRAY

ADD SRC CODE

DEL SRC CODE

CHG DESCR .

ADD

SRC CODE

DEL

SRC CODE

CHG

DESCR