Cocos2d-x 3.1 Lua Binding

http://my.oschina.net/skyHacker2/blog/298397

目录[-]

参考：http://www.cocos2d-x.org/docs/manual/code-ide/binding-custom-class-to-lua/en

////  HNLuaTest.h//  cocos2d_libs////  Created by Eleven Chen on 14-8-5.////#ifndef __cocos2d_libs__HNLuaTest__#define __cocos2d_libs__HNLuaTest__#include "cocos2d.h"#include <string>class Test : public cocos2d::Ref{public:    static std::string helloMsg();    static Test* create();    bool init();    static cocos2d::Vec2 left();};#endif /* defined(__cocos2d_libs__HNLuaTest__) */

////  HNLuaTest.cpp//  cocos2d_libs////  Created by Eleven Chen on 14-8-5.////#include "HNLuaTest.h"using namespace cocos2d;std::string Test::helloMsg(){    return "Hello from  HNLuaTest::helloMsg()";}Test* Test::create(){    return new test();}bool Test::init(){    return true;}Vec2 Test::left(){    return Vec2(0,0);}

进入到tolua目录：$(PROJECT_ROOT)/frameworks/cocos2d-x/tools/tolua

在之前先看看README文件，并安装好环境。

README文件中提到必须要用androID ndk r9b来编译，因为编译的时候用到了C++ std 4.7的头文件，而r9b包含了4.7，我用的是r9d，只有4.6和4.8。我把*.ini文件里面的4.7改成4.8来编译。

新建一个cocos2dx_custom.ini文件，然后从其他文件里面copy一份代码过来修改，代码里面每一个设置都有详细的注释。

clang_headers = -I%(clangllvmdir)s/lib/clang/3.3/include # the prefix to be added to the generated functions. You might or might not use this in your own# templatesprefix = cocos2dx_custom# create a target namespace (in JavaScript,this would create some code like the equiv. to `ns = ns || {}`)# all classes will be embedded in that namespacetarget_namespace = cc# the native namespace in which this module locates,this parameter is used for avoID conflict of the same class name in different modules,as "cocos2d::Label" <-> "cocos2d::ui::Label".cpp_namespace = androID_headers = -I%(androIDndkdir)s/platforms/androID-14/arch-arm/usr/include -I%(androIDndkdir)s/sources/cxx-stl/gnu-libstdc++/4.8/libs/armeabi-v7a/include -I%(androIDndkdir)s/sources/cxx-stl/gnu-libstdc++/4.8/includeandroID_flags = -D_SIZE_T_defineD_ clang_headers = -I%(clangllvmdir)s/lib/clang/3.3/include clang_flags = -nostdinc -x c++ -std=c++11cocos_headers = -I%(cocosdir)s/cocos -I%(cocosdir)s/cocos/editor-support -I%(cocosdir)s/cocos/platform/androIDcocos_flags = -DANDROIDcxxgenerator_headers = # extra arguments for clangextra_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 parseheaders =  %(cocosdir)s/cocos/my/HNLuaTest.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 = Test.*# 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" lookupclasses_have_no_parents = Test# base classes which will be skipped when their sub-classes found them.base_classes_to_skip =# classes that create no constructor# Set is special and we will use a hand-written constructorabstract_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

为了方便，每次绑定时不需要生成cocos2d-x的绑定代码，新建一个genbindings_custom.py文件，然后复制genbindings.py的代码过来，把下面的地方：

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'),\                    'custom.ini': ('custom','lua_custom_auto'),\                    'cocos2dx_custom.ini' : ('cocos2dx_custom','lua_cocos2dx_custom_auto'),\                    }

改为

cmd_args = {'cocos2dx_custom.ini' : ('cocos2dx_custom',\                    }

./genbindings_custom.py

生成的代码在cocos/scripting/lua-bindings/auto里面

LOCAL_PATH := $(call my-dir)include $(CLEAR_VARS)LOCAL_MODulE := cocos_custom_staticLOCAL_MODulE_filename := libmyLOCAL_SRC_fileS := \HNLuaTest.cppLOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH) $(LOCAL_PATH)./LOCAL_C_INCLUDES := $(LOCAL_PATH) $(LOCAL_PATH)./LOCAL_CFLAGS += -Wno-psabiLOCAL_EXPORT_CFLAGS += -Wno-psabiLOCAL_WHolE_STATIC_liBRARIES := cocos2dx_staticinclude $(BUILD_STATIC_liBRARY)$(call import-module,.)

LOCAL_SRC_fileS := manual/ccluaBrIDge.cpp \                            #省略                            auto/lua_cocos2dx_custom_auto.cpp \                            ../../../external/lua/tolua/tolua_event.c \                            #省略

修改AppDelegate.cpp

//register custom function    //LuaStack* stack = engine->getLuaStack();    //register_custom_function(stack->getLuaState());    LuaStack *stack = engine->getLuaStack();    auto L = stack->getLuaState();    if (L)    {        lua_getglobal(L,"_G");        register_all_cocos2dx_custom(L);        lua_settop(L,0);    }#if (COCOS2D_DEBUG>0)    if (startRuntime())        return true;#endif    engine->executeScriptfile(ConfigParser::getInstance()->getEntryfile().c_str());    return true;

这里不能按照原本代码注释的方法那样做，那样会出错。

而且都是tolua_module这个函数里面的lua_rawget(L,-2);这一行出错。

原因是：

LuaEngine初始化的时候会运行3个lua文件，把stack给清空了。

在tolua_module函数中，lua_pushstring(L,name);后，栈只有一个元素，所以 只需要把_G放到栈中，再运行register_all_cocos2dx_custom(L);，如果模块不在_G中，就添加到_G中，就可以全局访问了。

-- test custom local msg = cc.Test:helloMsg() print(msg)

ns_map:    "cocos2d::extension::": "cc."    "cocos2d::ui::": "ccui."    "cocos2d::": "cc."    "spine::": "sp."    "cocostudio::": "ccs."    "cocosbuilder::": "cc."    "CocosDenshion::": "cc."    # 我自己的命名空间    "hunuo::": "hn."