cocos2d-x + lua 类继承问题

Cocos2d-x
#1

使用了 TestLua Demo中资源中的extern.lua 的class 方法做类的继承

在脚本CardListLayer.lua 中 自定义自己的类：

require("extern")

– 创建层

local CardListLayer = class(“CardListLayer”)

CardListLayer.__index = CardListLayer


cocos2d-x use tolua++ to export lua interface, for every c++ object exist in lua is userdata,

in lua 5.1 userdata can associate a private table call “environment”,

tolua++ use this feature to store data for every object. when you index the object,

it will find in “environment” first.


–]]


– 层 CardBagLayer 继承 CCLayer

function CardListLayer.extend(target)


local t = tolua.getpeer(target)
if not t then
    t = {}
    tolua.setpeer(target, t)
end
setmetatable(t, CardListLayer)
return target



end


– overwrite

function CardListLayer:init()

– do samething my init()

return true

end


– create object

function CardListLayer.create()


local layer = CardListLayer.extend(CCLayer:create())
if nil ~= layer then
    layer:init()
end
return layer    



end

return CardListLayer


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<span style="color:#333333;font-family:Helvetica, Tahoma, Arial, sans-serif;font-size:16px;line-height:24px;background-color:#f5f5f5;">在另一个脚本中调用时</span><br style="color:#333333;font-family:Helvetica, Tahoma, Arial, sans-serif;font-size:16px;line-height:24px;background-color:#f5f5f5;" />
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<p><span style="color:#333333;font-family:Helvetica, Tahoma, Arial, sans-serif;font-size:16px;line-height:24px;background-color:#f5f5f5;"><pre class="brush:lua; toolbar: true; auto-links: false;">        local pLayer = OpenLua("CCardBagLayer") -- 
        local cardListLayer = pLayer:create()
        print(type(cardListLayer))
        this.layer.addChild(cardListLayer)



 


其中OpenLua(FileName) 


function OpenLua(FileName)
    return require(CFileName)
end
```

 打印出来的 local cardListLayer = pLayer:create() 的类型为  userdata   但在this.layer.addChild(cardListLayer) 报 ：error in function 'addChild'. 
     argument #2 is ''; 'CCNode' expected 


 



我的继承方法错了吗 ? 还是有哪地方方法不对 ？对比了TestLua中的 ExtensionTest.lua的


TableViewTestLayer 中的Demo 好像区别只在生成对象在脚本内（TestLua）及另一脚本（我的） 是我返回值有问题吗？ 求分析.谢谢 


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