cocos2dx3.0rc导出自定义类到lua的方法

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。

转载请注明出处http://www.cnblogs.com/mrblue/p/3637910.html

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 ools oluaREADME.mdown说得去做，不做赘述。

2、写c++类(我测试用的是cocos2d-x-3.0rc0 estslua-empty-testprojectClassesHelloWorldScene.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 ools olua，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

　　

　　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 ools olua下，敲入python genbindings_myclass.py

回车运行。如果前面没问题的话你会在cocos2d-x-3.0rc0 estslua-empty-testprojectClasses多了一个文件夹auto，然后把里面生成lua_myclass_auto.cpp和lua_myclass_auto.hpp加入拽如工程

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

local function main()
    -- avoid memory leak
    collectgarbage("setpause", 100)
    collectgarbage("setstepmul", 5000)

    local hello = HelloWorld:create()
    local sceneGame = cc.Scene:create()
    sceneGame:addChild(hello)
    cc.Director:getInstance():runWithScene(sceneGame)

    if(1==1) then
        return
    end

……
……

运行（注意如果代码没变动是不是拷贝脚本资源的，要手动拷贝），你就会看到HelloWorld，而不是小松鼠了。