COCOS2D-X3.0 next Lua and C + + call each other

Here we talk about how Lua and C + + communicate with each other

Original connection: http://blog.csdn.net/qqmcy/article/details/26052771

DJLCDATA.H Implementation Class

djlcdata.h//uitestlua////Created by du Jia Li on 14-5-17.////#ifndef __uitestlua__djlcdata__#define __UITESTLUA__DJLCDA Ta__#include "Cocos2d.h" #include "CCLuaEngine.h" using_ns_cc;using namespace Std;extern "C" {#include "lua.h" #include "        Lualib.h "#include" lauxlib.h "}class djlcdata {public:static djlcdata* getinstance (); /* getluavarstring: Call LUA global string luafilename = Lua file name varName = The variable name to fetch in LUA */const CH        ar* getluavarstring (const char* luafilename,const char* varName); /* * @brief getluaoneoftable: Call one of the LUA global table elements luafilename = Lua file name varName = to fetch LUA The table variable name KeyName = The key for one of the elements in the table to be taken in LUA */const char* getluavaroneoftable (const char* Luafi            Lename,const char* varname,const char* keyName);     /* * getluavartable: Call LUA global Table Luafilename = Lua file name varName = name of table variable to be taken (note: all data returned) */Const char* getluavartable(const char* Luafilename,const char* varName);  /* Callluafunction: Call lua function Luafilename = Lua file name functionname = The function name to invoke in LUA */const            char* callluafunction (const char* luafilename,const char* functionname);        /***************** Lua-C + + **************/void callcppfunction (const char* luafilename);    private:static int cppfunction (lua_state* ls);    static bool _isfirst;    Static djlcdata* _shared;                Const char* Getfilefullpath (const char* fileName); }; #endif/* Defined (__uitestlua__djlcdata__) */

DJLCData.cpp

djlcdata.cpp//uitestlua////Created by du Jia Li on 14-5-17.////#include "DJLCData.h" bool djlcdata::_isfirst;djlcdata* D    jlcdata::_shared;djlcdata* djlcdata::getinstance () {if (_shared = = nullptr) {_shared = new djlcdata (); } return _shared;} Const char* djlcdata::getluavarstring (const char *luafilename, const char *varname) {lua_state* ls = luaengine::getinst    Ance ()->getluastack ()->getluastate ();        int isOpen = Lual_dofile (ls, Getfilefullpath (luafilename));        if (IsOpen! = 0) {log ("Open Lua error:%i", IsOpen);    return nullptr;    } lua_settop (LS, 0);    Lua_getglobal (LS, varName);    int statescode = lua_isstring (ls, 1);        if (Statescode! = 1) {log ("Open Lua Error:%i", Statescode);    return nullptr;    } const char* str = lua_tostring (ls, 1);    Lua_pop (LS, 1);        return str; }const char* djlcdata::getluavaroneoftable (const char *luafilename, const char *varname, const char *keyname) {Lua_stat e* ls = LuaengIne::getinstance ()->getluastack ()->getluastate ();    int isOpen = Lual_dofile (ls, Getfilefullpath (luafilename));        if (IsOpen! = 0) {log ("Open Lua Error:%i", IsOpen);    return nullptr;    } lua_getglobal (LS, varName);    int Statescode lua_istable (LS,-1);        if (Statescode! = 1) {log ("Open Lua Error:%i", Statescode);    return nullptr;    } lua_pushstring (LS, keyName);    Lua_gettable (LS,-2);    Const char* valuestring = lua_tostring (ls,-1);    Lua_pop (LS,-1); return valuestring;} Const char* djlcdata::getluavartable (const char *luafilename, const char *varname) {lua_state* ls = Luaengine::getinsta    NCE ()->getluastack ()->getluastate ();        int isOpen = Lual_dofile (ls, Getfilefullpath (luafilename));        if (IsOpen! = 0) {log ("Open Lua error:%i", IsOpen);    return nullptr;    } lua_getglobal (LS, varName);    int it = lua_gettop (LS);        Lua_pushnil (LS);        string result = ""; while (LS, it lua_next) {string key = Lua_tostring (ls,-2);        String value = lua_tostring (ls,-1);        result = result + key + ":" + value + "\ T";    Lua_pop (LS, 1);    } lua_pop (LS, 1);    return Result.c_str (); }const char* djlcdata::callluafunction (const char *luafilename, const char *functionname) {lua_state* ls = luaengine::g    Etinstance ()->getluastack ()->getluastate ();        int isOpen = Lual_dofile (ls, Getfilefullpath (luafilename));        if (IsOpen) {log ("Open Lua error:%i", IsOpen);            return nullptr;    } lua_getglobal (LS, functionname);    Lua_pushstring (LS, "shen");    Lua_pushnumber (LS, 23);        Lua_pushboolean (LS, true);    /* Lua_call first parameter: The second parameter of the function's number of arguments: The number of function return values */Lua_call (LS, 3, 1);    Const char* Iresult = lua_tostring (ls,-1);    return iresult; }void djlcdata::callcppfunction (const char *luafilename) {lua_state* ls = luaengine::getinstance ()->getluastack ()-        >getluastate ();        /*The C + + function called by LUA must be static */Lua_register (ls, "cppfunction", cppfunction);    int isOpen = Lual_dofile (ls, Getfilefullpath (luafilename));        if (IsOpen! = 0) {log ("Open Lua error:%i", IsOpen);    Return    }}int djlcdata::cppfunction (lua_state *ls) {int luanum = (int) lua_tonumber (LS, 1);    char* luastr = (char*) lua_tostring (LS, 2);    Log ("Two references from LUA when invoking CPP functions:%i,%s", LUANUM,LUASTR);    /* value returned to LUA */lua_pushnumber (LS, 321);        Lua_pushstring (LS, "ShenQi");        /* Returns the number of LUA values */return 2;  }const char* djlcdata::getfilefullpath (const char *filename) {//src//here//refers to my Lua file placed under SRC this folder std::string str =        Stringutils::format ("src//%s", fileName); Return Fileutils::getinstance ()->fullpathforfilename (str). C_STR ();}

Hello2.lua

function Myadd (x, y)    return x + yendluastr = "ShenQi" luatable = {name = "Xiaonan", age = "$"}function lualogstring (_lo Gstr,_lognum,_logbool)    print ("Lua script prints a string from C:", _logstr,_lognum,_logbool)    return "Call Lua function OK" Endfunction call_cpp (_logstr,_lognum,_logbool)    num,str = cppfunction (999, "LUA string")    print (" Get two return values from the CPP function: ", NUM,STR) end

Call Method:

Log ("%s", Djlcdata::getinstance ()->getluavarstring ("Hello2.lua", "luastr"));        Log ("%s", Djlcdata::getinstance ()->getluavaroneoftable ("Hello2.lua", "luatable", "name"));                Log ("Table =%s", Djlcdata::getinstance ()->getluavartable ("Hello2.lua", "luatable"));                Log ("Call Lua Function back:%s", Djlcdata::getinstance ()->callluafunction ("Hello2.lua", "lualogstring"));                Djlcdata::getinstance ()->callcppfunction ("Hello2.lua");        Djlcdata::getinstance ()->callluafunction ("Hello2.lua", "call_cpp");

cocos2d:shenqicocos2d:xiaonancocos2d:Table = name:xiaonanage:20cocos2d: [Lua-print] LUA The script prints a string from C: Shen23truecocos2d:call lua function Back:call LUA functions Okcocos2d:lua The two parameters that came when invoking CPP: 999,lua STRINGCOCOS2D: [Lua-print] obtains two return values from the CPP function: 321shenqi

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COCOS2D-X3.0 next Lua and C + + call each other