cocos2d-Lua与c++交互，lua如何绑定C++类。

概述我们有一个C++类，TestLayer.h #ifndef __TEST_LAYER_H__#define __TEST_LAYER_H__#include "cocos2d.h"namespace cocos2d{ class TestLayer : public Layer { public: static TestLayer* create(); bool ini

我们有一个C++类，TestLayer.h

#ifndef __TEST_LAYER_H__#define __TEST_LAYER_H__#include "cocos2d.h"namespace cocos2d{	class TestLayer : public Layer	{	public:		static TestLayer* create();		bool init();		voID myPrint(const std::string &str);		TestLayer(voID);		~TestLayer(voID);	};}int register_TestLayer(lua_State* tolua_S);#endif

TestLayer.cpp

#include "TestLayer.h"using namespace cocos2d;TestLayer::TestLayer(){}TestLayer::~TestLayer(){}voID TestLayer::myPrint(const std::string &str){	cclOG(str.c_str());}TestLayer* TestLayer::create(){	TestLayer *pRet = new TestLayer();	if ( pRet && pRet->init() ) {        pRet->autorelease();        return pRet;    }    CC_SAFE_DELETE(pRet);    return nullptr;}bool TestLayer::init(){	if ( !Layer::init() ) {		return false;	}	return true;}//lua binding#include "tolua_fix.h"#include "LuaBasicConversions.h"int lua_cocos2dx_TestLayer_create(lua_State* tolua_S){    int argc = 0;    bool ok  = true;#if COCOS2D_DEBUG >= 1    tolua_Error tolua_err;#endif#if COCOS2D_DEBUG >= 1    if (!tolua_isusertable(tolua_S,1,"cc.TestLayer",&tolua_err)) goto tolua_lerror;#endif    argc = lua_gettop(tolua_S) - 1;    if (argc == 0)    {        if(!ok)        {            tolua_error(tolua_S,"invalID arguments in function 'lua_cocos2dx_TestLayer_create'",nullptr);            return 0;        }        TestLayer* ret = TestLayer::create();        object_to_luaval<TestLayer>(tolua_S,"cc.Layer",(TestLayer*)ret);        return 1;    }    luaL_error(tolua_S,"%s has wrong number of arguments: %d,was expecting %d\n ","cc.Layer:create",argc,0);    return 0;#if COCOS2D_DEBUG >= 1    tolua_lerror:    tolua_error(tolua_S,"#ferror in function 'lua_cocos2dx_TestLayer_create'.",&tolua_err);#endif    return 0;}int lua_cocos2dx_TestLayer_myPrint(lua_State* tolua_S){    int argc = 0;	TestLayer* cobj = nullptr;    bool ok  = true;#if COCOS2D_DEBUG >= 1    tolua_Error tolua_err;#endif#if COCOS2D_DEBUG >= 1    if (!tolua_isusertype(tolua_S,&tolua_err)) goto tolua_lerror;#endif    cobj = (cocos2d::TestLayer*)tolua_tousertype(tolua_S,0);#if COCOS2D_DEBUG >= 1    if (!cobj)     {        tolua_error(tolua_S,"invalID 'cobj' in function 'lua_cocos2dx_TestLayer_myPrint'",nullptr);        return 0;    }#endif    argc = lua_gettop(tolua_S)-1;    if (argc == 1)     {        std::string arg0;        ok &= luaval_to_std_string(tolua_S,2,&arg0,"cc.TestLayer:myPrint");        if(!ok)        {            tolua_error(tolua_S,"invalID arguments in function 'lua_cocos2dx_TestLayer_myPrint'",nullptr);            return 0;        }        cobj->myPrint(arg0);        lua_settop(tolua_S,1);        return 1;    }    luaL_error(tolua_S,was expecting %d \n","cc.TestLayer:myPrint",1);    return 0;#if COCOS2D_DEBUG >= 1    tolua_lerror:    tolua_error(tolua_S,"#ferror in function 'lua_cocos2dx_TestLayer_myPrint'.",&tolua_err);#endif    return 0;}int lua_register_cocos2dx_TestLayer(lua_State* tolua_S){    tolua_usertype(tolua_S,"cc.TestLayer");    tolua_cclass(tolua_S,"TestLayer",nullptr);    tolua_beginmodule(tolua_S,"TestLayer");        tolua_function(tolua_S,"create",lua_cocos2dx_TestLayer_create);				tolua_function(tolua_S,"myPrint",lua_cocos2dx_TestLayer_myPrint);    tolua_endmodule(tolua_S);    std::string typename = typeID(TestLayer).name();    g_luaType[typename] = "cc.TestLayer";    g_typeCast["TestLayer"] = "cc.TestLayer";    return 1;}int register_TestLayer(lua_State* tolua_S){	lua_getglobal(tolua_S,"_G");    if (lua_istable(tolua_S,-1))//stack:...,_G,{        tolua_open(tolua_S);				tolua_module(tolua_S,"cc",0);		tolua_beginmodule(tolua_S,"cc");		lua_register_cocos2dx_TestLayer(tolua_S);		tolua_endmodule(tolua_S);    }    lua_pop(tolua_S,1);        return 1;}

这样就写好了一个c++类及其绑定函数，然后我们在Appdelegate.cpp中加入如下代码

bool AppDelegate::applicationDIDFinishLaunching(){    // set default FPS    Director::getInstance()->setAnimationInterval(1.0 / 60.0f);       // register lua module    auto engine = LuaEngine::getInstance();    ScriptEngineManager::getInstance()->setScriptEngine(engine);    lua_State* L = engine->getLuaStack()->getLuaState();    lua_module_register(L);	register_TestLayer(L);    // If you want to use Quick-Cocos2d-X,please uncomment below code    // register_all_quick_manual(L);    LuaStack* stack = engine->getLuaStack();    stack->setXXTEAKeyAndSign("2dxLua",strlen("2dxLua"),"XXTEA",strlen("XXTEA"));        //register custom function    //LuaStack* stack = engine->getLuaStack();    //register_custom_function(stack->getLuaState());    #if (COCOS2D_DEBUG > 0) && (CC_CODE_IDE_DEBUG_SUPPORT > 0)    // NOTE:Please don't remove this call if you want to deBUG with Cocos Code IDE    RuntimeEngine::getInstance()->start();    cocos2d::log("iShow!");#else    if (engine->executeScriptfile("src/main.lua"))    {        return false;    }#endif        return true;}

OK，大功告成，我们只要在lua文件中做如下调用进行测试：

local MainScene = class("MainScene",cc.load("mvc").VIEwBase)function MainScene:onCreate()    -- add background image    display.newSprite("MainSceneBg.jpg")        :move(display.center)        :addTo(self)    -- add play button    local playbutton = cc.MenuItemImage:create("Playbutton.png","Playbutton.png")        :onClicked(function()            --self:getApp():enterScene("PlayScene")             local layer = cc.TestLayer:create()             layer:myPrint("哈哈")        end)    cc.Menu:create(playbutton)        :move(display.cx,display.cy - 200)        :addTo(self)endreturn MainScene

可以看到，lua文件中，成功打印“哈哈”

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