Cocos2d-x 3.2 Lua调用自定义C++类

2014年11月13日 by Brandon

1.环境

  • 系统：Windows 7 64位
  • Cocos2d-x：3.2
  • python：2.75 32位
  • NDK：android-ndk-r9b或android-ndk-r9d，需要配置环境变量：NDK_ROOT
  • pyyaml：PyYAML-3.10.win32-py2.7.exe 安装到 ..\Python27\Lib\site-packages
  • pyCheetah：Cheetah.zip 解压到 ..\Python27\Lib\site-packages

2.自定义C++类

路径：我保存在..\cocos2d-x-3.2\cocos\my\

  1. // CustomClass.h
  2. #ifndef __CUSTOM__CLASS
  3. #define __CUSTOM__CLASS
  4. #include "cocos2d.h"
  5. namespace cocos2d {
  6. class CustomClass : public cocos2d::Ref
  7. {
  8. public:
  9.     CustomClass();
  10.     ~CustomClass();
  11.     static cocos2d::CustomClass* create();
  12.     bool init();
  13.     CREATE_FUNC(CustomClass);
  14. };
  15. } //namespace cocos2d
  16. #endif // __CUSTOM__CLASS
  1. // CustomClass.cpp
  2. #include "CustomClass.h"
  3. USING_NS_CC;
  4. CustomClass::CustomClass(){
  5. }
  6. CustomClass::~CustomClass(){
  7. }
  8. bool CustomClass::init(){
  9.     return true;
  10. }
  11. std::string CustomClass::helloMsg() {
  12.     return "Hello from CustomClass::sayHello";
  13. }

3.自定义ini文件

路径：..\cocos2d-x-3.2\tools\tolua\

可复制目录下的某个ini文件作为模板，我用了：cocos2dx_spine.ini

主要需要修改以下参数配置：

  • [cocos2dx_spine]
  • prefix = cocos2dx_spine
  • target_namespace = sp
  • headers = %(cocosdir)s/cocos/editor-support/spine/spine-cocos2dx.h
  • classes = Skeleton SkeletonAnimation

我这里的设置是：

  • [cocos2dx_custom]
  • prefix = cocos2dx_custom
  • target_namespace = my
  • headers = %(cocosdir)s/cocos/my/CustomClass.h
  • classes = CustomClass

4.修改genbindings.py脚本

路径：..\cocos2d-x-3.2\tools\tolua\genbindings.py

找到cmd_args项，增加：

  1. 'cocos2dx_custom.ini' : ('cocos2dx_custom', 'lua_cocos2dx_custom'), \

可用#注释掉其它的ini文件引用

5.运行genbindings.py脚本

路径：..\cocos2d-x-3.2\tools\tolua\genbindings.py

在命令提示符中进入脚本所在目录,执行：

  1. python genbindings.py

完成后可在..\cocos2d-x-3.2\cocos\scripting\lua-bindings\auto\中找到生成的文件

6.运行工程

  • 用visual studio打开..\cocos2d-x-3.2\build\cocos2d-win32.vc2012.sln，设置lua-empty-test为启动项目。
  • 将..\cocos2d-x-3.2\cocos\my\下的自定义类添加到项目lua-empty-test的Classes中
  • 将生成的C++的桥接文件添加到项目liblua的auto下
  • 对liblua项目右键，在属性 - 配置属性 - C/C++ - 常规 - 附加包含目录中加入生成文件路径..\cocos2d-x-3.2\cocos\my\
  • 编辑lua-empty-test的入口类AppDelegate.cpp：
  1. #include "cocos2d.h"
  2. #include "AppDelegate.h"
  3. #include "audio/include/SimpleAudioEngine.h"
  4. #include "base/CCScriptSupport.h"
  5. #include "CCLuaEngine.h"
  6.  
  7. USING_NS_CC;
  8. using namespace CocosDenshion;
  9.  
  10. AppDelegate::AppDelegate()
  11. {
  12.     // fixed me
  13.     //_CrtSetDbgFlag(_CRTDBG_ALLOC_MEM_DF|_CRTDBG_LEAK_CHECK_DF);
  14. }
  15.  
  16. AppDelegate::~AppDelegate()
  17. {
  18.     // end simple audio engine here, or it may crashed on win32
  19.     SimpleAudioEngine::getInstance()->end();
  20.     //CCScriptEngineManager::destroyInstance();
  21. }
  22. bool AppDelegate::applicationDidFinishLaunching()
  23. {
  24.     // register lua engine
  25.     LuaEngine* engine = LuaEngine::getInstance();
  26.     ScriptEngineManager::getInstance()->setScriptEngine(engine);
  27.     
  28.     //The call was commented because it will lead to ZeroBrane Studio can't find correct context when debugging
  29.     //engine->executeScriptFile("src/hello.lua");
  30.     //增加以下5句
  31.     LuaStack* stack = engine->getLuaStack();
  32.     lua_State* state = stack->getLuaState();
  33.     lua_getglobal(state, "_G");
  34.     register_all_MyClass(stack->getLuaState());
  35.     lua_pop(state, 1);
  36.  
  37.     engine->executeString("require 'src/hello.lua'");
  38.     return true;
  39. }
  40.  
  41. // This function will be called when the app is inactive. When comes a phone call,it's be invoked too
  42. void AppDelegate::applicationDidEnterBackground()
  43. {
  44.     Director::getInstance()->stopAnimation();
  45.     SimpleAudioEngine::getInstance()->pauseBackgroundMusic();
  46. }
  47.  
  48. // this function will be called when the app is active again
  49. void AppDelegate::applicationWillEnterForeground()
  50. {
  51.     Director::getInstance()->startAnimation();
  52.     SimpleAudioEngine::getInstance()->resumeBackgroundMusic();
  53. }
  • 在lua中引用自定义的C++类

路径：..\cocos2d-x-3.2\tests\lua-empty-test\src\

打开hello.lua，在main方法中加入以下代码：

  1.     local test = my.CustomClass:create()
  2.     print("==================== " .. test:helloMsg())
  • 执行

回到visual studio，开始执行，搞掂。