Component Task to Consume Json

Archived
1

I make a task to consume a json
m.readerTask = createObject(“roSGNode”, “ContentReader”)
m.readerTask.setField(“uri”, “https://…/metadata/x?limit=1”)
m.readerTask.observeField(“content”, “buildModel”)
m.readerTask.control = “RUN”

I call the component that extends of task and I put the following:
content = createObject(“roSGNode”, “ContentNode”)
readInternet = createObject(“roUrlTransfer”)
readInternet.setUrl(m.top.uri)
json = ParseJSON(readInternet.GetString())

I get the following error:

051: readInternet = createObject(“roUrlTransfer”)
052:* json = ParseJSON(readInternet.GetString())
Member function not found in BrightScript Component or interface. (runtime error &hf4) in pkg:/components/Content/conten
t.brs(52)
052: json = ParseJSON(readInternet.GetString())

2

That’s because roUrlTransfer has no function named “GetString”.
See https://sdkdocs.roku.com/display/sdkdoc … er+Content for sample code - the pink at the bottom.

3

Thank you very much but now this:
054: json = ParseJSON(result)
055:
056: print json
057:* for each kind in json.editorials

‘Dot’ Operator attempted with invalid BrightScript Component or interface refere
nce. (runtime error &hec) in pkg:/components/Content/content.brs(57)
057: for each kind in json.editorials

This function probe with an interface example the basic navigation that does not use components, but in this new application that use components arise this problem, please can you help me[/size][/color]

4

By the error sounds as if json is invalid. What did the previous line show? Add maybe also a print type(json)

056:                      print json
5

Invalid Return
BRIGHTSCRIPT: ERROR: ParseJSON: Data is empty:

In the basic navigation project if you brought me information, so I coded it and if it returns me:
port = CreateObject(“roMessagePort”)
    request = CreateObject(“roUrlTransfer”)
    
    request.AddHeader(“Authorization”, “Basic <BASE 64 ENCODED SEGMENT WRITE KEY>”)
    request.AddHeader(“Accept”, “application/json”)
    request.AddHeader(“Content-Type”, “application/json”)
    request.EnablePeerVerification(false)
    request.EnableHostVerification(false)
    request.RetainBodyOnError(true)
    request.SetCertificatesFile(“common:/certs/ca-bundle.crt”)
    request.InitClientCertificates()
    request.SetMessagePort(port)
    request.SetUrl(“https://…/metadata/x?limit=1”)
if (request.AsyncGetToString())
        while (true)
            msg = wait(0, port)
            if (type(msg) = “roUrlEvent”)
                code = msg.GetResponseCode()
                if (code = 200)
                    playlist = CreateObject(“roArray”, 10, true)
                    json = ParseJSON(msg.GetString())
                    'print json
                    for each kind in json.editorials

But when placing it in scene graph something I do wrong, taking into account that it is HTTPS I do the following:

m.readerTask = createObject(“roSGNode”, “ContentReader”)
    m.readerTask.setField(“uri”, “https://…/metadata/x?limit=1”)
    m.readerTask.observeField(“content”, “buildModel”)
    m.readerTask.control = “RUN”

I call the component that extends of task and I put the following:

content = createObject(“roSGNode”, “ContentNode”)
    contentxml = createObject(“roXMLElement”)
 
    readInternet = createObject(“roUrlTransfer”)
    readInternet.setUrl(m.top.uri)
    result = readInternet.getToString()
    json = ParseJSON(result)
                    for each kind in json.editorials

There the error described appears to me, is there any other way to do it or that advises me to correct

6

Trace the problem back step by step!

BRIGHTSCRIPT: ERROR: ParseJSON: Data is empty

is telling you that result is empty string - or at least is not JSON. Print result to check, then follow back what could be the reason - was the URL wrong, did you forget the SSL certificates etc

    readInternet = createObject("roUrlTransfer")
    readInternet.setUrl(m.top.uri)
    result = readInternet.getToString()
    json = ParseJSON(result)
                    for each kind in json.editorials
7

Thank you very much, I followed your advice and giving different types of follow up and another few examples corrected the different errors, greetings