Roku Developer Program

[JSM_IT_DEV]

I have set up the following Task:

<?xml version="1.0" encoding="utf-8" ?>

<!--********** Copyright 2015 Roku Corp.  All Rights Reserved. **********-->

<component name="launchSceneTask" extends="Task" >

<interface>
  <field id="scene" type="string" />
  <field id="video_key" type="string" />
</interface>

<script type="text/brightscript" >
<![CDATA[

sub init()
  m.top.functionName = "showSGScene"
end sub

sub showSGScene()
  print "in showSGScene"
  screen = CreateObject("roSGScreen")
  m.port = CreateObject("roMessagePort")
  screen.setMessagePort(m.port)
  scene = screen.CreateScene(m.top.scene)
  print "VIDEO KEY:"
  print m.top.video_key
  screen.show()

  while(true)
    msg = wait(0, m.port)
    msgType = type(msg)

    if msgType = "roSGScreenEvent"
    if msg.isScreenClosed() then return
    end if
  end while
end sub

]]>
</script>

</component>

And am calling it like so:

function showWatchSGScreen(video_key as String)
  m.sceneTask = CreateObject("roSGNode", "launchSceneTask")
  m.sceneTask.setField("scene", "watchScene")
  m.sceneTask.setField("video_key", video_key)
  m.sceneTask.ObserveField("test_trigger", "testFunction")
  m.sceneTask.control = "RUN"
end function

However, I get the following error:

Interface not a member of BrightScript Component (runtime error &hf3) in ...A2pJLT7/pkg:/components/homeScene.xml(97)
097:   m.sceneTask.setField("scene", "watchScene")

The examples in the documentation seem to be doing it exactly this way. Is there a bug, or is this user error?

[TheEndless]

Where are you calling showWatchSGScreen? You can only create Task nodes in certain contexts (I forget which don't work off the top of my head), so it's probably that m.sceneTask is invalid. You could potentially create the task node during init(), then just set the fields and control to "RUN" in your showWatchSGScreen function.

[JSM_IT_DEV]

I am calling showWatchSGScreen() from Main() in my main.brs file. I've also tried calling it from a KeyDown event in one of my scenes. Neither work.

[TheEndless]

Right, if you're calling it from Main, then it's running in the main BrightScript context, which doesn't support Task nodes. You should create and configure the Task node in the init() method of your scene, then you should be able to trigger it by setting the control to "RUN" at any point later in execution.

[JSM_IT_DEV]

You, my friend, are a life-saver. Thank you so much!

Here's the amended code:

In the init() method of my xml component:

m.sceneTask = CreateObject("roSGNode", "launchSceneTask")

In the showWatchSGScreen(video_key as String) method, called from a KeyPress event:

  m.sceneTask.setField("scene", "watchScene")
  m.sceneTask.setField("video_key", video_key)
  m.sceneTask.control = "RUN"

You've saved my life