cocos2dx是怎么使用lua引擎的

第一步：看cocos2dx调用lua的最初切入点：

bool AppDelegate::applicationDidFinishLaunching(){    CCDirector *pDirector = CCDirector::sharedDirector();    pDirector->setOpenGLView(CCEGLView::sharedOpenGLView());    CCEGLView::sharedOpenGLView()->setDesignResolutionSize(480, 320, kResolutionNoBorder);    pDirector->setDisplayStats(true);    pDirector->setAnimationInterval(1.0 / 60);    // register lua engine    CCLuaEngine* pEngine = CCLuaEngine::defaultEngine();//从这里开始了lua旅程。    CCScriptEngineManager::sharedManager()->setScriptEngine(pEngine);//保存刚才新建的lua引擎对象，以便别处调用。    std::string path = CCFileUtils::sharedFileUtils()->fullPathForFilename("hello.lua");//CCFileUtils工具类一定封装了文件的搜索路径。     //接下来直接执行了脚本，跟句helloCpp工程的实现，这里本该是类似    //CCScene *pScene = HelloWorld::scene();    //pDirector->runWithScene(pScene);    //这样的代码，但这里并没有这样的代码，可以猜测：hello.lua中一定是实现了类似这样的一些功能，事实上，一定是这样。    //---因为需要添加的这些东西scene、other nodes都是一些c++类的对象，    //既然hello.lua能完成这些工作，那么lua也一定是有能力访问并操作了这些类与对象，    //换句话说，也就是一定存在一种机制，让c++暴漏一些接口供lua调用，    //亦即：lua可以访问cocos2dx里面的东西，并且，一定封装的很好用，否则没人用了。    pEngine->executeScriptFile(path.c_str());     return true;}

第二步：看看CCLuaEngine到底干了点啥

class CCLuaEngine : public CCScriptEngineProtocol{public:    static CCLuaEngine* defaultEngine(void);        virtual ~CCLuaEngine(void);    virtual ccScriptType getScriptType() {        return kScriptTypeLua;    };    CCLuaStack *getLuaStack(void) {        return m_stack;    }    //-----------new in me 1    virtual void addSearchPath(const char* path);    //-----------new in me 2    virtual void addLuaLoader(lua_CFunction func);    //----------------------------inherit from CCScriptEngineProtocol------------------    //==================这些函数好像都是纯虚函数在父类中===========================    //--------下面这几个函数基本都是调用【CCLuaStack *m_stack;】的成员方法来实现的    virtual void removeScriptObjectByCCObject(CCObject* pObj);    virtual void removeScriptHandler(int nHandler);    virtual int reallocateScriptHandler(int nHandler);    virtual int executeString(const char* codes);    virtual int executeScriptFile(const char* filename);    virtual int executeGlobalFunction(const char* functionName);    //--------------------------------end--------------------------------    virtual int executeNodeEvent(CCNode* pNode, int nAction);    virtual int executeMenuItemEvent(CCMenuItem* pMenuItem);    virtual int executeNotificationEvent(CCNotificationCenter* pNotificationCenter, const char* pszName);    virtual int executeCallFuncActionEvent(CCCallFunc* pAction, CCObject* pTarget = NULL);    virtual int executeSchedule(int nHandler, float dt, CCNode* pNode = NULL);    virtual int executeLayerTouchesEvent(CCLayer* pLayer, int eventType, CCSet *pTouches);    virtual int executeLayerTouchEvent(CCLayer* pLayer, int eventType, CCTouch *pTouch);    virtual int executeLayerKeypadEvent(CCLayer* pLayer, int eventType);    virtual int executeAccelerometerEvent(CCLayer* pLayer, CCAcceleration* pAccelerationValue);    virtual int executeEvent(int nHandler, const char* pEventName, CCObject* pEventSource = NULL, const char* pEventSourceClassName = NULL);    int executeTableViewEvent(int nEventType,cocos2d::extension::CCTableView* pTableView,void* pValue = NULL, CCArray* pResultArray = NULL);    virtual int executeEventWithArgs(int nHandler, CCArray* pArgs);    virtual bool handleAssert(const char *msg);    virtual bool parseConfig(CCScriptEngineProtocol::ConfigType type, const std::string& str);    //----------------------------inherit from CCScriptEngineProtocol end--------------private:    CCLuaEngine(void)    : m_stack(NULL)    {}    bool init(void);        static CCLuaEngine* m_defaultEngine;    CCLuaStack *m_stack;};

第三步：CCLuaEngine类中有一个指针成员变量m_stack，我们先来看看它的定义，注意下CCLuaStack和CCLuaEngine的区别于联系

class CCLuaStack : public CCObject{public:    static CCLuaStack *create(void);    static CCLuaStack *attach(lua_State *L);    lua_State* getLuaState(void) {        return m_state;    }    virtual void addSearchPath(const char* path);    virtual void addLuaLoader(lua_CFunction func);    virtual void removeScriptObjectByCCObject(CCObject* pObj);    virtual void removeScriptHandler(int nHandler);    virtual int reallocateScriptHandler(int nHandler);    virtual int executeString(const char* codes);    virtual int executeScriptFile(const char* filename);    virtual int executeGlobalFunction(const char* functionName);    virtual void clean(void);    virtual void pushInt(int intValue);    virtual void pushFloat(float floatValue);    virtual void pushBoolean(bool boolValue);    virtual void pushString(const char* stringValue);    virtual void pushString(const char* stringValue, int length);    virtual void pushNil(void);    virtual void pushCCObject(CCObject* objectValue, const char* typeName);    virtual void pushCCLuaValue(const CCLuaValue& value);    virtual void pushCCLuaValueDict(const CCLuaValueDict& dict);    virtual void pushCCLuaValueArray(const CCLuaValueArray& array);        virtual bool pushFunctionByHandler(int nHandler);    virtual int executeFunction(int numArgs);    virtual int executeFunctionByHandler(int nHandler, int numArgs);    virtual int executeFunctionReturnArray(int nHandler,int nNumArgs,int nNummResults,CCArray* pResultArray);    virtual bool handleAssert(const char *msg);protected:    CCLuaStack(void)    : m_state(NULL)    , m_callFromLua(0)    {}    bool init(void);    bool initWithLuaState(lua_State *L);        lua_State *m_state;    int m_callFromLua;};