Any topic

Liberty BASIC Help Online

Using Inkey$

Liberty BASIC has a special variable named Inkey$ which can be used to fetch keys pressed. This only works with the graphicbox and with windows opened for graphics. Graphics controls handle an event called characterInput, which copies pressed-key codes into the Inkey$ variable. See Graphics Commands, Inkey$ , Reading Mouse Events and Keystrokes, and Using Virtual Key Contants with Inkey$ for more details. Here is a very short program demonstrating Inkey$:

'Inkey$ example

print "Keys pressed:"

open "Inkey$ example" for graphics as #graph

print #graph, "when characterInput [keyPressed]"

print #graph, "trapclose [quit]"

[loopHere]

'make sure #graph has input focus

print #graph, "setfocus"

'scan for events

scan

goto [loopHere]

[keyPressed]

key$ = Inkey$

if len(key$) < 2 then

print "pressed: "; key$

else

print "Unhandled special key"

end if

goto [loopHere]

[quit]

print "Quitting"

close #graph

end