OO in lua trouble: inherit

In my practice, I found two very strange behavior(please see attachment), the detail as follow:

client.lua: line 195: attempt to call method 'Debug' (a nil value)

question: why it could not find the method?

client_xchat.lua: line 83: attempt to index local 'tblSvrPacket' (a number value)

question: the parameter is table, why it become the number?

could you give me some advice to solve this problem, thanks in advanced.

andy.

------------------ 原始邮件 ------------------

发件人: "taozuhong"<taozuhong@qq.com>;

发送时间: 2011年5月6日(星期五) 上午10:09

收件人: "lua-l"<lua-l@lists.lua.org>; "roberto"<roberto@inf.puc-rio.br>;

主题: OO in lua new style: inherit

Hi guys,

I have found a new OO style, it is very convenient, so share it for u, any suggestion is welcome.

===============================================================

Client = {

__debug = false, -- 是否调试模式

__online = false, -- 是否联机在线

__timeout = 5000, -- 默认超时时间

}

function Client:New()

object = {}

-- 对象方法继承

setmetatable(object, self)

self.__index = self

-- 对象属性继承

object.__debug = self.__debug

object.__online = self.__online

object.__timeout = self.__timeout

return object

end

function Client:Delete()

-- release resources

end

function Client:Print(...)

print("Client: ", unpack(arg))

end

-- 继承基类对象

CLIENT_XCHAT = Client:New()

function CLIENT_XCHAT:New()

object = {}

-- 对象方法继承

setmetatable(object, self)

self.__index = self

return object

end

function CLIENT_XCHAT:Release()

self:Delete()

end

function CLIENT_XCHAT:Log(...)

self:Print("CLIENT_XCHAT: ", unpack(arg))

end

-- Example

myClient = CLIENT_XCHAT:New()

myClient:Log("Hello world")

------------------

Andy Tao[陶祖洪]

祖洪测试自动化 http://www.zuhong.cn

天是圆的，地是方的，凡事都要有个规矩！