Forum Discussion

kidasov's avatar
kidasov
Channel Surfer
8 years ago

How to start task again?

I have a problem with task. I want to get data from the server. So I have a task:
sub init()
    m.top.functionName = "executeTask"
vimeoClientID = "clientId"
    vimeoClientSecret = "clientSecret+"
    
    blob = CreateObject("roByteArray")
    blob.FromAsciiString(vimeoClientID + ":" + vimeoClientSecret)
    
    m.base64Vimeo = blob.ToBase64String()
end sub

function executeTask()    
    url = m.top.url
    
    print("In execute task function")
    
    request = CreateObject("roURLTransfer")
    request.SetCertificatesFile("common:/certs/ca-bundle.crt")
    request.AddHeader("X-Roku-Reserved-Dev-Id", "")
    request.AddHeader("Authorization","basic " + m.base64Vimeo)
    request.InitClientCertificates()
    request.SetURL(url)
    
    m.top.response = request.getToString()
    m.top.request = url
end function

In mainscene I create a task in main function
sub init()
    m.requestTask = CreateObject("roSGNode", "RequestTask")    [size=85][font=Helvetica Neue, Helvetica, Arial, sans-serif]   [/font][/size]
end sub


Also there is a function to start my task.
sub makeURLRequest(props)
 m.requestTask.setField("url", props.url)
 m.requestTask.control = "RUN"
 m.requestTask.observeField("response", props.callback)
end sub

I get data (bunch of videos) from server like this:
sub getVimeoChannelVideosPage(page, callback)
 print("Making request for page: " + page.toStr())
 makeURLRequest({
 url: "https://api.vimeo.com/channels/" + m.channel.id + "/videos?page=" + page.toStr(),
 callback: callback,
 })
end sub

sub getVimeoChannelVideos(callback)
 getVimeoChannelVideosPage(1, "onGetVimeoVideosPage")
end sub

And the problem happens in callback when I get first page with videos and  want to get another one page by restarting task. But code in executeTask function  never happens.
sub onGetVimeoVideosPage()
 response = m.requestTask.response 
 json = parseJSON(response)

 videos = json.data
 nextPage = json.paging.next
 
 if (nextPage <> invalid)
 m.channel.currentPage += 1
 print("Current page " + m.channel.currentPage.toStr())
 getVimeoChannelVideosPage(m.channel.currentPage, "onGetVimeoVideosPage")
 else
 showScene(m.homeScene)
 end if
 
end sub

I highly appreciate any help or advice. Also feel so sorry for my bad english.
Roku Developer Program

2 Replies

  • tim_beynart's avatar
    tim_beynart
    Channel Surfer
    8 years ago
    I'd suggest that instead of storing a reference to the task, create a new one for each request.
    With your current implementation, you could try adding a STOP but it may not work:
    sub makeURLRequest(props)
     m.requestTask.control = "STOP"
     m.requestTask.setField("url", props.url)
     m.requestTask.control = "RUN"
     m.requestTask.observeField("response", props.callback)
    end sub
    • NicholasStokes's avatar
      NicholasStokes
      Binge Watcher
      3 years ago


      I am running this file in task.xml

       

      <?xml version=“1.0” encoding=“utf-8" ?>
      <!-- Copyright 2016 Roku Corp. All Rights Reserved. -->
      <component name=“ContentReader” extends=“Task”>
      <script type=“text/brightscript”>
      <![CDATA[
      sub init()
      m.top.functionName = “getAPIResponse”
      end sub

      sub getAPIResponse()
      port = CreateObject(“roMessagePort”)
      request = CreateObject(“roUrlTransfer”)
      request.setRequest(“GET”)
      request.setURL(m.top.contenturi)
      jsonString = request.GetToString()
      jsonParsed = ParseJson(jsonString)
      m.top.content = jsonParsed
      end sub
      ]]>
      </script>
      </component>

       

      And Used this below function in main.brs file

       

      sub Main()
      print “in showChannelSGScreen”
      m.readXMLContentTask = createObject(“roSGNode”, “ContentReader”)
      m.readXMLContentTask.observeField(“content”, “setcontent”)
      m.readXMLContentTask.contenturi = “http://www.sdktestinglab.com/Tutorial/content/xmlcontent.xml”
      m.readXMLContentTask.control = “RUN”
      readData = m.top.content
      print “readData”
      end sub

      but this function is not executed in main.brs file
      Can you please help me to execute this function from main.brs Or provide the sample examples