Specifications

Chapter 9. Event Polling and Error/Event Trapping
147
9.2 Event Polling
[ 1 ] Programming sample
The program below shows the event polling example which monitors the bar code reader and
the keyboard for occurrence of events.
This example uses the EOF and INKEY$ functions to check the data input for the bar code
reader and the keyboard, respectively.
OPEN "BAR:" AS #1 CODE "A"
loop
WAIT 0,3
IF NOT EOF(1) THEN
GOSUB barcod
ENDIF
k$=INKEY$
IF k$<>"" THEN
GOSUB keyin
ENDIF
GOTO loop
barcod
BEEP
LINE INPUT #1,dat$
PRINT dat$
RETURN
keyin
.
.
.
RETURN