以前要导出c++类到lua，就得手动维护pkg文件，那简直就是噩梦，3.0以后就会感觉生活很轻松了。
下面我就在说下具体做法。
1、安装必要的库和工具包，以及配置相关环境变量，请按照cocos2d-x-3.0rc0\tools\tolua\README.mdown说得去做，不做赘述。
2、写c++类(我测试用的是cocos2d-x-3.0rc0\tests\lua-empty-test\project\Classes\HelloWorldScene.cpp)
3、写一个生成的python脚本，你不会写，没关系，我们会照猫画虎
1）进入目录cocos2d-x-3.0rc0\tools\tolua，复制一份genbindings.py，命名为genbindings_myclass.py
2）把生成目录制定到咱工程里去，打开genbindings_myclass.py把
output_dir='%s/cocos/scripting/lua-bindings/auto' % project_root
改成
output_dir='%s/tests/lua-empty-test/project/Classes/auto'% project_root
3）修改命令参数,把
cmd_args={'cocos2dx.ini': ('cocos2d-x','lua_cocos2dx_auto'),\
'cocos2dx_extension.ini': ('cocos2dx_extension','lua_cocos2dx_extension_auto'),\
'cocos2dx_ui.ini': ('cocos2dx_ui','lua_cocos2dx_ui_auto'),\
'cocos2dx_studio.ini': ('cocos2dx_studio','lua_cocos2dx_studio_auto'),\
'cocos2dx_spine.ini': ('cocos2dx_spine','lua_cocos2dx_spine_auto'),\
'cocos2dx_physics.ini': ('cocos2dx_physics','lua_cocos2dx_physics_auto'),\
}
改成
cmd_args={'myclass.ini': ('myclass','lua_myclass_auto') }
4）这时你可能问myclass.ini在哪啊，我们下来就写这个文件。原理一样，我还是照猫画虎，拿cocos2dx_spine.ini改的。
[myclass]
# the prefix to be added to the generated functions. You might or might not use this in your own
# templates
prefix = myclass
# create a target namespace (in javascript,this would create some code like the equiv. to `ns = ns || {}`)
# all classes will be embedded in that namespace
target_namespace =
android_headers = -I%(androidndkdir)s/platforms/android-14/arch-arm/usr/include -I%(androidndkdir)s/sources/cxx-stl/gnu-libstdc++/4.7/libs/armeabi-v7a/include -I%(androidndkdir)s/sources/cxx-stl/gnu-libstdc++/4.7/include
android_flags = -D_SIZE_T_DEFINED_
clang_headers = -I%(clangllvmdir)s/lib/clang/3.3/include
clang_flags = -nostdinc -x c++ -std=c++11
cocos_headers = -I%(cocosdir)s/cocos -I%(cocosdir)s/cocos/2d -I%(cocosdir)s/cocos/base -I%(cocosdir)s/cocos/ui -I%(cocosdir)s/cocos/physics -I%(cocosdir)s/cocos/2d/platform -I%(cocosdir)s/cocos/2d/platform/android -I%(cocosdir)s/cocos/math/kazmath -I%(cocosdir)s/extensions -I%(cocosdir)s/external -I%(cocosdir)s/cocos/editor-support -I%(cocosdir)s
cocos_flags = -DANDROID -DCOCOS2D_JAVASCRIPT
cxxgenerator_headers =
# extra arguments for clang
extra_arguments = %(android_headers)s %(clang_headers)s %(cxxgenerator_headers)s %(cocos_headers)s %(android_flags)s %(clang_flags)s %(cocos_flags)s %(extra_flags)s
# what headers to parse
headers = %(cocosdir)s/tests/lua-empty-test/project/Classes/HelloWorldScene.h
# what classes to produce code for. You can use regular expressions here. When testing the regular
# expression,it will be enclosed in "^$",like this: "^Menu*$".
classes = HelloWorld
# what should we skip? in the format ClassName::[function function]
# ClassName is a regular expression,but will be used like this: "^ClassName$" functions are also
# regular expressions,they will not be surrounded by "^$". If you want to skip a whole class,just
# add a single "*" as functions. See bellow for several examples. A special class name is "*",which
# will apply to all class names. This is a convenience wildcard to be able to skip similar named
# functions from all classes.
skip =
rename_functions =
rename_classes =
# for all class names,should we remove something when registering in the target VM?
remove_prefix =
# classes for which there will be no "parent" lookup
classes_have_no_parents =
# base classes which will be skipped when their sub-classes found them.
base_classes_to_skip = Ref ProcessBase
# classes that create no constructor
# Set is special and we will use a hand-written constructor
abstract_classes =
# Determining whether to use script object(js object) to control the lifecycle of native(cpp) object or the other way around. Supported values are 'yes' or 'no'.
script_control_cpp = no
.ini中部分参数的用法： name: 单纯只是名称。 prefix: 最后生成的文件都会以这个命名前缀，如 prefix.cpp,prefix.hpp,prefix_api.js classes: 你的所需转换的类的名称，必须是所导入的头文件中所有的类，这里可以使用正则表达式来加入多个类，参考cocox2ds.ini。 extra_arguments：一些接口所需的系统参数。如clang包，android ndk包的引入所需的系统参数在此添加，写法可以参照以上三个.ini都有。 headers: 你所需要绑定的头文件路径。 target_namespace：命名空间。最后生成的JS文件的类，会以这个命名空间开头。例如你的类为sqlite，命名空间为cocos2dx，那么最后生成的就是cocos2dx.sqlite。 rename_functions：可以将你要绑定的方法的名称更改成你所要的。可以更改多个，用逗号隔开，写法参照 sqliteCpp::[sqlite3_execCpp=sqlite3_exec]，这个就是将sqliteCpp中的sqlite3_ execCpp方法重命名为sqlite3_exec方法。 rename_classes ：同上，重命名类。 skip ：跳过你所不需要绑定的方法和类，于是就不生成。
改的时候要注意这些行
[myclass] prefix = myclass target_namespace = headers = %(cocosdir)s/tests/lua-empty-test/project/Classes/HelloWorldScene.h classes = HelloWorld skip = abstract_classes =
4、下面要自动生成代码了，打开命令行工具，cd到cocos2d-x-3.0rc0\tools\tolua下，敲入
python genbindings_myclass.py
5、把我们生成的个module在脚本引擎初始化的时候加入lua。
编辑AppDelegate.cpp，包含lua_myclass_auto.hpp头文件，在
LuaEngine* engine = LuaEngine::getInstance();
后面加入
register_all_myclass(engine->getLuaStack()->getLuaState());6、编译运行。这样HelloWorld这个类就被导出到lua了。
测试------------------------------------------------
打开hello.lua，编辑local function main()这个函数
把前面改成
localfunctionmain()
-- avoid memory leak
collectgarbage("setpause",100)
collectgarbage("setstepmul",5000)
localhello = HelloWorld:create()
localsceneGame = cc.Scene:create()
sceneGame:addChild(hello)
cc.Director:getInstance():runWithScene(sceneGame)
if(1==1)then
return
end
……
……
如果还是没懂什么意思，就去参考http://www.tairan.com/archives/5493
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