Brightsign BrightScript 2 Reference Guide Manual do Utilizador descarregar pdf (Página 20)

Events

Events in BrightScript center around an event loop and the “roMessagePort” Roku object.

Any RokuObject can be posted to a message port. Typically these will be Objects that

are designed to post events. For example, the “roTimer” class posts events of type

“roTimerEvent”.

Example:

print "BrightSign Button-LED Test Running"

p = CreateObject("roMessagePort")

gpio = CreateObject("roGpioControlPort")

gpio.SetPort(p)

while true

msg=wait(0, p)

if type(msg)="roGpioButton" then

butn = msg.GetInt()

if butn <=5 then

gpio.SetOutputState(butn+17,1)

print "Button Pressed: ";butn

sleep(500)

gpio.SetOutputState(butn+17,0)

end if

REM ignore buttons pressed while flashing led above

while p.GetMessage()<>invalid

end while

Note that the following two lines:

while true

msg=wait(0, p)

Could be replaced with:

For each msg in p

And then the last “end while” would become a “next”.

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Brightsign BrightScript 2 Reference Guide Manual do Utilizador Página 20