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jlfreund's avatar
jlfreund
Visitor
13 years ago

GetChildElements erroneously returns <UNINITIALIZED>

Hi,

My app downloads and parses some XML that contains


...
    <categoryList>
        <category>Name1</category>
        <category>Name2</category>
        <category>Name3</category>
    </categoryList>


And successfully parses down to 


    if posterItem.Getname() = "categoryList" then
        categoryItems = posterItem.GetChildElements()
        for each categoryItem in categoryItems
            ' CRASH: categoryItem = <UNINITIALIZED>
            print categoryItem.GetName()


The problem is that when I print categoryItems from the dubugger, I get 3 valid children whose names match the expected category names. But when I try to iterate over categoryItems using for each, it always prepends three <UNINITIALIZED> values before the valid values.


Brightscript Debugger> p categoryItems
<Component: roXMLElement>
<Component: roXMLElement>
<Component: roXMLElement>

Brightscript Debugger> p foreach categoryItem in categoryItems
<UNINITIALIZED><UNINITIALIZED><UNINITIALIZED><Component: roXMLElement>
<Component: roXMLElement>
<Component: roXMLElement>


Does anyone know why that may be, and how I could fix or workaround the problem or detect the error upstream? I don't see any problem with the XML itself.
Roku Developer Program

5 Replies

  • RokuMarkn's avatar
    RokuMarkn
    Visitor
    13 years ago
    This seems to be a problem with the debugger but not with the language. The failure happens when you run the foreach statement in the debugger, but it seems to work ok when compiled into a channel. This works for me:

    string ="<list><c>name1</c><c>name2</c><c>name3</c></list>"
    xml = createobject("roXMLElement")
    if not xml.Parse(string) then stop
    categoryItems = xml.getChildElements()
    for each categoryItem in categoryItems
        print categoryItem.GetName()
    end for


    This prints

    c
    c
    c


    --Mark
  • RokuMarkn's avatar
    RokuMarkn
    Visitor
    13 years ago
    Hm, actually I can't reproduce the problem with the debugger either. Can you give a complete example of how to reproduce it?

    --Mark
  • jlfreund's avatar
    jlfreund
    Visitor
    13 years ago
    Hi, thanks for the quick reply. I was going to send the sample offline, but was able to sanitize it enough to post here (for everyone's benefit). 


    Sub Main()
        rsp = "<menutree><roPosterScreen><categoryList><category>1</category><category>2</category><category>3</category></categoryList></roPosterScreen></menutree>"    xml=CreateObject("roXMLElement")
        xml.Parse(rsp)
        
        rokumenu = xml.GetChildElements()
        for each element in rokumenu
            if element.GetName() = "roPosterScreen" then
                posterScreen = element.GetBody()
            endif
        next
        
        for each posterItem in posterScreen
            if posterItem.GetName() = "categoryList" then
                categoryItems = posterItem.GetChildElements()
                for each catgoryItem in categoryItems
                    print "categoryItem: " + categoryItem.GetName()
                    if categoryItem.GetName() = "category" then
                        print "Push " + categoryItem.GetBody()
                    endif
                next
            endif
        next
    End Sub
  • RokuMarkn's avatar
    RokuMarkn
    Visitor
    13 years ago
    Hm this is a strange one. Simply changing the names of two variables (categoryItems -> cs and categoryItem -> c) seems to fix the problem. I've filed a bug on this and we will investigate.

    --Mark