c – 在C中存储对Lua值的引用,如何才能完成？

概述例如,假设我有一个键处理接口,在C中定义为： class KeyBoardHandler { public: virtual onKeyPressed(const KeyEventArgs& e); virtual onKeyReleased(const KeyEventArgs& e);} 现在,我想将此扩展到Lua,以允许Lua利用并在脚本中注册KeyboardHandl 例如,假设我有一个键处理接口,在C中定义为：

class KeyBoardHandler { public:    virtual onKeypressed(const KeyEventArgs& e);    virtual onkeyreleased(const KeyEventArgs& e);}

现在,我想将此扩展到Lua,以允许Lua利用并在脚本中注册KeyboardHandler.

到目前为止,这是原型.

class ScriptKeyboardHandler : public KeyboardHandler{public:    ... prevIoUs methods omitted    static voID createFromScript(lua_State* L);    bool createCppData();private:    ScriptKeyBoardHandler(lua_State* L);    int mSelf;    int mKeyPressFunc;    int mkeyreleaseFunc;    lua_State* mpLuaState;}

现在,我知道实现将是这样的：

ScriptKeyboardHandler::ScriptKeyboardHandler(lua_State* L) :    mpState(L){ }ScriptKeyboardHandler::onKeypressed(...) {      // check if mKeyPressFunc is a function     // call it,passing in mself,and the event args as params} // On Key Release omitted because being similar to the key pressedScriptKeyboardHandler::createFromScript(lua_State* L){    auto scriptKeyboardHandler = new ScriptKeyboardHandler(L);    if (scriptKeyboardHandler->createCppData())    {        // set the light user data and return a reference to ourself (mSelf)    }}ScriptKeyboardHandler::createCppData() {    // get the constructor data (second param) and find the keypressed and keyreleased function,store those for later usage    // any other data within the constructor data will apply to object}-- Syntax of the lua codeMyScriptHandler = { }MyScriptHandler.__index = MyScriptHandlerMyScriptHandler.onKeyPress = function(self,args)endhandler = createScriptHandler(handler,MyScriptHandler)registerKeyHandler(handler)

我只是不知道如何在函数作为表中的参数传入时找到这些函数.

我这样做了吗？我希望我是,这是一个痛苦的屁股因为tolua不容易支持虚拟课程,而不是你可以从脚本中得到的.

我不担心其他功能,我怎么从我的C代码中找到这些变量(按键功能等)

解决方法 这大致是我对onKeypressed的实现.

voID ScriptKeyboardHandler::onKeypressed(){   //Get the table corresponding to this object from the C registry   lua_pushlightuserdata(mpLuaState,this);   lua_gettable(mpLuaState,LUA_REGISTRYINDEX);   //Now get the function to call from the object   lua_pushstring(mpLuaState,"onKeyPress");   lua_gettable(mpLuaState,-2);   //Now call the function    lua_pushvalue(mpLuaState,-2 ); // Duplicate the self table as first argument   //Todo: Add the other arguments   lua_pcall(mpLuaState,1,0 ); // Todo: You'll need some error checking here and change the 1 to represent the number of args.   lua_pop(mpLuaState,1); //Clean up the stack}

但是,您还需要更新构造函数以将表示处理程序的lua对象存储到注册表中.

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