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venkatareddy
Level 7

roMessagePort: Trying to construct a message port on a non-plugin thread

I am getting error in Home.brs , when I calling the service .Getting error at the line  request.SetMessagePort(port)

Here is the error,

BRIGHTSCRIPT: ERROR: roUrlTransfer: creating MAIN|TASK-only component failed on RENDER thread: pkg:/components/Home/Home.brs(67)
BRIGHTSCRIPT: ERROR: roMessagePort: Trying to construct a message port on a non-plugin thread: pkg:/components/Home/Home.brs(68)

BrightScript Micro Debugger.
Enter any BrightScript statement, debug commands, or HELP.

Suspending threads...
Thread selected:  1*   pkg:/components/Home/Home.brs(69)       request.SetMessagePort(port)

Current Function:
065:  Function getMenuItemsByGroup() 
066:      mplinkStatus = CreateObject("roDeviceInfo").GetLinkStatus()
067:      request = CreateObject("roUrlTransfer")
068:      port = CreateObject("roMessagePort")
069:*     request.SetMessagePort(port)
070:      request.SetRequest("GET")
071:      request.SetUrl("URL")
072:      if (request.AsyncGetToString())
073:        while (true)
'Dot' Operator attempted with invalid BrightScript Component or interface reference. (runtime error &hec) in pkg:/components/Home/Home.brs(69)
069:     request.SetMessagePort(port)
Backtrace:
#1  Function getmenuitemsbygroup() As Dynamic
   file/line: pkg:/components/Home/Home.brs(69)
#0  Function init() As Dynamic
   file/line: pkg:/components/Home/Home.brs(28)
Local Variables:
global           Interface:ifGlobal
m                roAssociativeArray refcnt=3 count:4
mplinkstatus     Boolean val:true
request          Invalid
port             Invalid
msg              <uninitialized>
code             <uninitialized>
items            <uninitialized>
json             <uninitialized>
resultlist       <uninitialized>
result           <uninitialized>
resultitem       <uninitialized>
event            <uninitialized>
Threads:
ID    Location                                Source Code
 0    pkg:/source/main.brs(16)                screen.show()
 1*   pkg:/components/Home/Home.brs(69)       request.SetMessagePort(port)
  *selected

Brightscript Debugger> 
Thread detached

Thread detached

Please find the code,

Home.xml :

<?xml version="1.0" encoding="utf-8" ?> 
<!--********** Copyright 2016 Roku Corp.  All Rights Reserved. **********-->

<component name="Home" extends="Panel" >
<interface>
<field id="rowListContent" type="node" onchange="rowListContentChanged" />
</interface> 
<script type="text/brightscript" uri="pkg:/components/Home/Home.brs"/>
<children>
  <RowList id="theRowList"/>
  <Poster id = "icon"  />  
</children>
</component>


Home.brs :

function init()
 menuList = getMenuItemsByGroup() 
    for each menu in menuList
        print "menu type is : ";menu.type
        carouselList = getCarouselItemsByType(menu.type)
    end for
end function

Function getMenuItemsByGroup() 
    mplinkStatus = CreateObject("roDeviceInfo").GetLinkStatus()
    request = CreateObject("roUrlTransfer")
    port = CreateObject("roMessagePort")
    request.SetMessagePort(port)
    request.SetRequest("GET")
    request.SetUrl("URL")
    if (request.AsyncGetToString())
      while (true)
          msg = wait(0, port)
          if (type(msg) = "roUrlEvent")
              code = msg.GetResponseCode()
              if (code = 200)              
                  items = CreateObject("roArray", 1, true)
                  json = ParseJSON(msg.GetString())
                  resultList = json.results
                  for each result in resultList
                     resultItem = {
                          title: result.title
                          type: result.name
                          noOfElements: result.pageSize
                          layoutType: result.layoutType
                      }
                      print "result item : ";resultItem
                      items.push(resultItem)
                  end for
                  return items
              endif
          else if (event = invalid)
              request.AsyncCancel()
          endif
      end while
    endif
    return invalid
End Function



Function getCarouselItemsByType(carouselType) as object
    mplinkStatus = CreateObject("roDeviceInfo").GetLinkStatus()
    print "link status is :";mplinkStatus 
    if (not mplinkStatus) then  
        ShowMessageDialog("Alert","No network connection")
        return invalid
    end if
    request = CreateObject("roUrlTransfer")
    print "request is :";request
    port = CreateObject("roMessagePort")
    print "port is :";port
    request.SetMessagePort(port)
    request.SetRequest("GET")
    request.SetUrl("URL")
    if (request.AsyncGetToString())
      while (true)
          msg = wait(0, port)
          if (type(msg) = "roUrlEvent")
              code = msg.GetResponseCode()
              if (code = 200) 
                  items = CreateObject("roArray", 1, true)
                  print "items is :";items
                  json = ParseJSON(msg.GetString())
                  resultList = json.results
                  for each result in resultList
                     print "result is: ";result
                     images = CreateObject("roArray", 1, true)
                     imageItems = result.images.values
                     
                     for each imageItem in imageItems
                          image ={
                            profile: imageItem.profile
                            type: imageItem.type
                            link: imageItem.link
                          }
                          print "image link is : "image.link;
                          images.push(image)
                      end for
                      print "images count ";images.Count()
                     resultItem = {
                          id: result._id
                          title: result.title
                          description: result.generalInfo.description
                          images: images
                      }
                      items.push(resultItem)
                  end for
                  return items
              endif
          else if (event = invalid)
              request.AsyncCancel()
          endif
      end while
    endif
  return invalid
End Function
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1 Reply
Roku Employee
Roku Employee

Re: roMessagePort: Trying to construct a message port on a non-plugin thread

The second diagnostic is confusing even to me, i admit -
but what it means is that you cannot create roUrlTransfer or roMessagePort in the render thread.
See https://sdkdocs.roku.com/display/sdkdoc ... pt+Support
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