possible bug in roMessagePort.wait()

Archived
1

This is the shortest code I’ve been able to get to duplicate the issue.


Sub Main()
    u = getStringFromKeyboard("Enter username")
    p = getStringFromKeyboard("Enter password")
End Sub

Function getStringFromKeyboard(message = "" As String) As String
    result = ""
    port = CreateObject("roMessagePort")
    screen = CreateObject("roKeyboardScreen")
    screen.SetMessagePort(port)
    screen.SetDisplayText(message)
    screen.AddButton(1, "OK")
    screen.Show()
    while true
        print "waiting..."
        msg = wait(0, port)
        print "done waiting"
        if type(msg) = "roKeyboardScreenEvent" then
            if msg.GetIndex() = 1 then
                result = screen.GetText()
                exit while
            end if
        end if
    end while
    screen.Close()
    return result
End Function

Running this app, I get prompted for a username, I enter the username and hit ok, then I get booted back to the main menu. The second keyboard screen (for the password) never appears. The debug output shows:


waiting...
done waiting
waiting...

I.e., it’s crashing on the second call to wait(). Am I doing something wrong or is this a platform bug?

2

“Yoglets” wrote:
This is the shortest code I’ve been able to get to duplicate the issue.


Sub Main()
    u = getStringFromKeyboard("Enter username")
    p = getStringFromKeyboard("Enter password")
End Sub

Function getStringFromKeyboard(message = "" As String) As String
    result = ""
    port = CreateObject("roMessagePort")
    screen = CreateObject("roKeyboardScreen")
    screen.SetMessagePort(port)
    screen.SetDisplayText(message)
    screen.AddButton(1, "OK")
    screen.Show()
    while true
        print "waiting..."
        msg = wait(0, port)
        print "done waiting"
        if type(msg) = "roKeyboardScreenEvent" then
            if msg.GetIndex() = 1 then
                result = screen.GetText()
                exit while
            end if
        end if
    end while
    screen.Close()
    return result
End Function

Running this app, I get prompted for a username, I enter the username and hit ok, then I get booted back to the main menu. The second keyboard screen (for the password) never appears. The debug output shows:


waiting...
done waiting
waiting...

I.e., it’s crashing on the second call to wait(). Am I doing something wrong or is this a platform bug?Create a facade screen. The roku exits the app immediately after the last screen is closed. You create the first keyboard screen and also close it in the getStringFromKeyboard function, and since there are no other screens open at that moment, that’s when the Roku kills the app. See RokuKevin’s explanation here: viewtopic.php?p=162550#p162550 (note: he refers to ‘screen flickering’, which may have been true when he wrote it, but nowadays it’s a requirement to have a screen always stuck open at the back of your stack for the life of your app: viewtopic.php?p=321402#p321402).

3

Excellent! Thank you gonzotek.