Roku Developer Program

[rikkrokker]

Hi all,

I'm pulling my hair out and need some help. I'm trying to update my previously working audio player app to allow for refresh of the player buttons based on playstate. I keep getting errors on the 'function reloadbuttons (screen as object, isplaying as boolean, ispaused as boolean)' line, saying that 'screen' is uninitialized. What am I missing (while I still have hair on my head)...

Function showAudioSpringboardScreen(item as object)
    screen = CreateObject("roSpringboardScreen")
    port = screen.getmessageport()
    busydialog=CreateObject("roOneLineDialog") ' creates a dialog box
    print "showAudioSpringboardScreen"
	print item
	print item.title
	
    
    busydialog.SetMessagePort(port)
    screen.AllowUpdates(false)
	screen.SetBreadcrumbText("Live Audio Stream","")
	screen.SetBreadcrumbEnabled(true)
    screen.SetContent(item)
    screen.Show()
	audio=createobject("roaudioplayer")
	isplaying=false
	ispaused=false
	reloadbuttons(screen,playing,paused)

   	screen.SetDescriptionStyle("audio") 'audio, movie, video, generic
                                        ' generic+episode=4x3,

    screen.SetStaticRatingEnabled(false)
    screen.AllowUpdates(true)
    screen.setadurl("http://crntalk.com/podcast/roku/app/images/adbanner_hd.png","http://crntalk.com/podcast/roku/app/images/adbanner_sd.png")
	screen.setAdSelectable(true)


    downKey=3
    selectKey=6

    while true
        msg = wait(0, aud.GetMessagePort())


'*******************
if type(msg)="roAudioPlayerEvent"	
	print msg.getmessage()
	if msg.isStatusMessage() and msg.GetMessage() = "startup progress" then
	busydialog.SetMessagePort(aud.GetmessagePort()) 'sets a message port for the dialog box
	busydialog.SetTitle("Your CRN Live Stream will begin momentarily. ") 'displays a line of text for the dialog box title
	busydialog.ShowBusyAnimation() ' enables a spinning animation
	busydialog.Show() ' makes the dialog box and busy animation display
	
	else if msg.isStatusMessage() and msg.GetMessage() = "start of play" then
	busydialog.Close()

	else if msg.isStatusMessage() and msg.GetMessage() = "end of playlist" then
	busydialog.Close()
	busydialog=CreateObject("roOneLineDialog") ' creates a dialog box
	busydialog.SetMessagePort(aud.GetmessagePort()) 'sets a message port for the dialog box
	busydialog.SetTitle("The Connection Timed Out.") 'displays a line of text for the dialog box title
	busydialog.Show() ' makes the dialog box

	busydialog.Close()
	endif

'*******************

else if type(msg) = "roSpringboardScreenEvent"
    if msg.isScreenClosed()
    print "Screen closed"
    exit while 

else if msg.isadselected() then
	print "Ad Selected"
	showParagraphScreen(true)
              
else if msg.isButtonPressed()
    print "Button pressed: "; msg.GetIndex(); " " msg.GetData()
    if msg.GetIndex() = 0 then
    print "Audio Player Selected"
	audio.SetMessagePort (port)

	if item <> invalid and type(m) = "roAssociativeArray"
		print "Array OK"
		print item.url
		Print "Getting Stream"
		audio.stop()
        audio.addContent(item)	
		audio.play()
		isplaying=false
		ispaused=false
	reloadbuttons(screen,isplaying,ispaused)

Else if isplaying and not ispaused then

            	Audio.pause()
				isplaying=true
                ispaused=false
                reloadbuttons(screen,isplaying,ispaused)

else if isplaying and ispaused then

                audio.resume()
                isplaying=true
                ispaused=true
                reloadbuttons(screen,isplaying,ispaused)



	else print "invalid"
		'return -1
	end if

    			else if msg.GetIndex() = 1
				print "Audio Stop"
				audio.stop()
                islaying=false
                ispaused=false
                reloadbuttons(screen,isplaying,ispaused)

                else if msg.GetIndex() = 2 then
					if item.title = "CRN1" then
                         Schedule1(true)
					     print "Show Schedule"
					else if item.title = "CRN2" then
						 Schedule2(true)
					     print "Show Schedule"
					else if item.title = "CRN3" then
						 Schedule3(true)
					     print "Show Schedule"
					else if item.title = "CRN4" then
						 Schedule4(true)
					     print "Show Schedule"
					else if item.title = "CRN5" then
						 Schedule5(true)
					     print "Show Schedule"
					else if item.title = "CRN6" then
						 Schedule6(true)
					     print "Show Schedule"
					else if item.title = "CRN7" then
						 Schedule7(true)
						 print "Show Schedule"
					else print "No Schedule Loaded"
						end if
				else if msg.GetIndex() = 3
						showParagraphScreen(true)
                else if msg.GetIndex() = 4
                        return true
                    endif
            else
                print "Unknown event: "; msg.GetType(); " msg: "; msg.GetMessage()
            endif
        else 
            print "wrong type.... type=";msg.GetType(); " msg: "; msg.GetMessage()
        endif
    end while


    return screen
End Function

Function reloadButtons(screen as object, isplaying as Boolean, ispaused as Boolean)

                               screen.clearbuttons()
                               If not isplaying then
                               screen.addbutton(0,"Play")
                               Else if isplaying and not ispaused then
                               screen.addbutton(0,"Pause")
                               screen.addbutton(1,"Stop")

                               Else if isplaying and ispaused then
                               screen.addbutton(0,"Resume")
                               screen.addbutton(1,"Stop")
                               End if

                                'now add any non-conditional buttons

	    					screen.AddButton(2,"Network Schedule")
							screen.AddButton(3,"About CRN")
    						screen.AddButton(4,"Go Back")

                End function

[RokuChris]

Are you sure it's screen that's not initialized and not one of the other paramters? These lines look like they may be a problem...

   isplaying=false
   ispaused=false
   reloadbuttons(screen,playing,paused)

You initialize 2 variables named isplaying and ispaused, then pass two different variable names to reloadbuttons()

When a crash happens, the BrightScript console will show you a list of all variables currently in scope and their values. It will also show you a trace with line numbers so you can see which call to the function caused the problem.

[rikkrokker]

Thanks Chris,

I noticed a few typos in there after your reply. I guess sometimes an extra set of eyes is all I need. Working on this and will post my results.

Erik

[rikkrokker]

OK,

So after the typo fixes, my screen shows the buttons but seems to stop the event loop after the 'reloadbuttons' call and hang on the screen. How do I handle the reloadbuttons call and return to the event loop?

Here's the updated code:

Function showAudioSpringboardScreen(item as object)
    screen = CreateObject("roSpringboardScreen")
    port = screen.getmessageport()
    busydialog=CreateObject("roOneLineDialog") ' creates a dialog box
    print "showAudioSpringboardScreen"
	print item
	print item.title
	busydialog.SetMessagePort(port)

   	screen.SetDescriptionStyle("audio") 'audio, movie, video, generic
    screen.SetStaticRatingEnabled(false)
    screen.AllowUpdates(true)
    screen.setadurl("http://crntalk.com/podcast/roku/app/images/adbanner_hd.png","http://crntalk.com/podcast/roku/app/images/adbanner_sd.png")
	screen.setAdSelectable(true)
    screen.AllowUpdates(false)
	screen.SetBreadcrumbText("Live Audio Stream","")
	screen.SetBreadcrumbEnabled(true)
    screen.SetContent(item)
    screen.Show()

	audio=createobject("roaudioplayer")
	isplaying=false
	ispaused=false
	reloadbuttons(screen,isplaying,ispaused)

    downKey=3
    selectKey=6

   

 while true
        msg = wait(0, screen.GetMessagePort())


'**Busy Dialog Box**
if type(msg)="roAudioPlayerEvent"	
	print msg.getmessage()
	if msg.isStatusMessage() and msg.GetMessage() = "startup progress" then
	busydialog.SetMessagePort(screen.GetmessagePort()) 'sets a message port for the dialog box
	busydialog.SetTitle("Your CRN Live Stream will begin momentarily. ") 'displays a line of text for the dialog box title
	busydialog.ShowBusyAnimation() ' enables a spinning animation
	busydialog.Show() ' makes the dialog box and busy animation display
	
	else if msg.isStatusMessage() and msg.GetMessage() = "start of play" then
	busydialog.Close()

	else if msg.isStatusMessage() and msg.GetMessage() = "end of playlist" then
	busydialog.Close()
	busydialog=CreateObject("roOneLineDialog") ' creates a dialog box
	busydialog.SetMessagePort(screen.GetmessagePort()) 'sets a message port for the dialog box
	busydialog.SetTitle("The Connection Timed Out.") 'displays a line of text for the dialog box title
	busydialog.Show() ' makes the dialog box

	busydialog.Close()
	endif

'*******************

else if type(msg) = "roSpringboardScreenEvent"
    if msg.isScreenClosed()
    print "Screen closed"
    exit while 

else if msg.isadselected() then
	print "Ad Selected"
	showParagraphScreen(true)
              
else if msg.isButtonPressed()
    print "Button pressed: "; msg.GetIndex(); " " msg.GetData()
    if msg.GetIndex() = 0 then
    print "Audio Player Selected"
	audio.SetMessagePort (port)

	if item <> invalid and type(m) = "roAssociativeArray"
		print "Array OK"
		print item.url
		Print "Getting Stream"
		audio.stop()
        audio.addContent(item)	
		audio.play()
		isplaying=false
		ispaused=false
	reloadbuttons(screen,isplaying,ispaused)

else if isplaying and not ispaused then

            	Audio.pause()
				isplaying=true
                ispaused=false
                reloadbuttons(screen,isplaying,ispaused)

else if isplaying and ispaused then

                audio.resume()
                isplaying=true
                ispaused=true
                reloadbuttons(screen,isplaying,ispaused)



	else print "invalid"
		return -1
	end if

    			else if msg.GetIndex() = 1
				print "Audio Stop"
				audio.stop()
                islaying=false
                ispaused=false
                reloadbuttons(screen,isplaying,ispaused)

                else if msg.GetIndex() = 2 then
					if item.title = "CRN1" then
                         Schedule1(true)
					     print "Show Schedule"
					else if item.title = "CRN2" then
						 Schedule2(true)
					     print "Show Schedule"
					else if item.title = "CRN3" then
						 Schedule3(true)
					     print "Show Schedule"
					else if item.title = "CRN4" then
						 Schedule4(true)
					     print "Show Schedule"
					else if item.title = "CRN5" then
						 Schedule5(true)
					     print "Show Schedule"
					else if item.title = "CRN6" then
						 Schedule6(true)
					     print "Show Schedule"
					else if item.title = "CRN7" then
						 Schedule7(true)
						 print "Show Schedule"
					else print "No Schedule Loaded"
						end if
				else if msg.GetIndex() = 3
						showParagraphScreen(true)
                else if msg.GetIndex() = 4
                        return true
                    endif
            else
                print "Unknown event: "; msg.GetType(); " msg: "; msg.GetMessage()
            endif
        'else 
            'print "wrong type.... type="; msg.GetType(); " msg: "; msg.GetMessage()
        endif
    end while


    return true
End Function

Function reloadButtons(screen as object, isplaying as Boolean, ispaused as Boolean)

                               screen.clearbuttons()
                               If not isplaying then
                               screen.addbutton(0,"Play")
                               Else if isplaying and not ispaused then
                               screen.addbutton(0,"Pause")
                               screen.addbutton(1,"Stop")

                               Else if isplaying and ispaused then
                               screen.addbutton(0,"Resume")
                               screen.addbutton(1,"Stop")
                               End if

                                'now add any non-conditional buttons

	    					screen.AddButton(2,"Network Schedule")
							screen.AddButton(3,"About CRN")
    						screen.AddButton(4,"Go Back")

                End function

[RokuChris]

You aren't setting a message port on your springboard screen, so your Wait() never gets a roSpringboardScreenEvent. And you're setting the message port on your audio player in your roSpringboardScreenEvent handler, so that never happens either.

[rikkrokker]

So I cleaned up the MSG port oversight and some other housekeeping, but the app still hangs after the reloadbuttons function. Telnet shows no errors, the app just stops reponding with no buttons on screen. The graphic elements are there, but no buttons. The event loop seems to stop.

Function showAudioSpringboardScreen(item as object)
    screen = CreateObject("roSpringboardScreen")
    port = screen.getmessageport()
    busydialog=CreateObject("roOneLineDialog") ' creates a dialog box
    print "showAudioSpringboardScreen"
	print item
	print item.title
	'busydialog.SetMessagePort(port)

	screen.SetMessagePort(port)
   	screen.SetDescriptionStyle("audio") 'audio, movie, video, generic
    screen.SetStaticRatingEnabled(false)
    screen.AllowUpdates(true)
    screen.setadurl("http://crntalk.com/podcast/roku/app/images/adbanner_hd.png","http://crntalk.com/podcast/roku/app/images/adbanner_sd.png")
	screen.setAdSelectable(true)
    screen.AllowUpdates(false)
	screen.SetBreadcrumbText("Live Audio Stream","")
	screen.SetBreadcrumbEnabled(true)
    screen.SetContent(item)
    screen.Show()

	audio=createobject("roaudioplayer")
	audio.SetMessagePort (screen.GetMessagePort())
	isplaying=false
	ispaused=false
	reloadbuttons(screen,isplaying,ispaused)

    downKey=3
    selectKey=6

   

 while true
        msg = wait(0, screen.GetMessagePort())


'**Busy Dialog Box**
if type(msg)="roAudioPlayerEvent"	
	print msg.getmessage()
	if msg.isStatusMessage() and msg.GetMessage() = "startup progress" then
	busydialog.SetMessagePort(screen.GetmessagePort()) 'sets a message port for the dialog box
	busydialog.SetTitle("Your CRN Live Stream will begin momentarily. ") 'displays a line of text for the dialog box title
	busydialog.ShowBusyAnimation() ' enables a spinning animation
	busydialog.Show() ' makes the dialog box and busy animation display
	
	else if msg.isStatusMessage() and msg.GetMessage() = "start of play" then
	busydialog.Close()

	else if msg.isStatusMessage() and msg.GetMessage() = "end of playlist" then
	busydialog.Close()
	busydialog=CreateObject("roOneLineDialog") ' creates a dialog box
	busydialog.SetMessagePort(screen.GetmessagePort()) 'sets a message port for the dialog box
	busydialog.SetTitle("The Connection Timed Out.") 'displays a line of text for the dialog box title
	busydialog.Show() ' makes the dialog box

	busydialog.Close()
	endif

'*******************


else if type(msg) = "roSpringboardScreenEvent"
    if msg.isScreenClosed()
    print "Screen closed"
    exit while 

else if msg.isadselected() then
	print "Ad Selected"
	showParagraphScreen(true)
              
else if msg.isButtonPressed()
    print "Button pressed: "; msg.GetIndex(); " " msg.GetData()
    if msg.GetIndex() = 0 then
	if not isplaying and not ispaused then
    print "Audio Player Selected"

	if item <> invalid and type(m) = "roAssociativeArray"
		print "Array OK"
		print item.url
		Print "Getting Stream"
		audio.stop()
        audio.addContent(item)	
		audio.play()
		isplaying=false
		ispaused=false
	reloadbuttons(screen,isplaying,ispaused)
	else print "invalid"
		return -1
	end if



	else if isplaying and not ispaused then

            	Audio.pause()
				isplaying=true
                ispaused=false
                reloadbuttons(screen,isplaying,ispaused)

	else if isplaying and ispaused then

                audio.resume()
                isplaying=true
                ispaused=true
                reloadbuttons(screen,isplaying,ispaused)

	end if


    			else if msg.GetIndex() = 1
				print "Audio Stop"
				audio.stop()
                islaying=false
                ispaused=false
                reloadbuttons(screen,isplaying,ispaused)

                else if msg.GetIndex() = 2 then
					if item.title = "CRN1" then
                         Schedule1(true)
					     print "Show Schedule"
					else if item.title = "CRN2" then
						 Schedule2(true)
					     print "Show Schedule"
					else if item.title = "CRN3" then
						 Schedule3(true)
					     print "Show Schedule"
					else if item.title = "CRN4" then
						 Schedule4(true)
					     print "Show Schedule"
					else if item.title = "CRN5" then
						 Schedule5(true)
					     print "Show Schedule"
					else if item.title = "CRN6" then
						 Schedule6(true)
					     print "Show Schedule"
					else if item.title = "CRN7" then
						 Schedule7(true)
						 print "Show Schedule"
					else print "No Schedule Loaded"
						end if
				else if msg.GetIndex() = 3
						showParagraphScreen(true)
                else if msg.GetIndex() = 4
                        return true
                    endif
            else
                print "Unknown event: "; msg.GetType(); " msg: "; msg.GetMessage()
            endif
        'else 
           'print "wrong type.... type="; msg.GetType(); " msg: "; msg.GetMessage()
        endif

    end while


    'return true
End Function

Function reloadButtons(screen as object, isplaying as Boolean, ispaused as Boolean)

                            screen.clearbuttons()

                            If not isplaying then
                            screen.addbutton(0,"Play")

                            Else if isplaying and not ispaused then
                            screen.addbutton(0,"Pause")
                            screen.addbutton(1,"Stop")

                            Else if isplaying and ispaused then
                            screen.addbutton(0,"Resume")
                            screen.addbutton(1,"Stop")
                            End if

                                'now add any non-conditional buttons

	    					screen.AddButton(2,"Network Schedule")
							screen.AddButton(3,"About CRN")
    						screen.AddButton(4,"Go Back")


                End function

[RokuChris]

I don't think you've fixed the message port issue and your event loop isn't doing anything because it isn't getting any events.

You're doing this:

port = screen.getmessageport()
screen.SetMessagePort(port)

Calling GetMessagePort() on a screen that doesn't have a message port will return invalid. So port is invalid when you pass it to SetMessagePort() and no message port is set on your screen. An easy way to see that is to print the type of port to the console:

screen = CreateObject("roSpringboardScreen")
port = screen.GetMessagePort()
? type(port)

You need to create a roMessagePort object and pass that to SetMessagePort()

port = CreateObject("roMessagePort")
screen.SetMessagePort(port)

You can also see what kind of events (if any) your Wait() is returning with the same technique:

msg = Wait(0, port)
? type(msg)