Cocos2dx-c++ and LUA data communication

This article was reproduced in: http://www.cnblogs.com/zisou/p/cocos2dx-lua2.html

We mainly address the following issues:

1,c++ How to get a variable value inside LUA?

2,c++ how to get a table in Lua (LUA uses table to implement object-oriented, it can invoke the more advanced reference method inside LUA)

3,c++ How to access a method inside Lua?

How does 4,c++ access a parameter-taking method inside Lua?

How does 5,c++ access a parameter-taking method inside Lua with a return value?

If all the above problems are solved, we can meet the problems of data communication in the game development.

I integrated the Himi brother this tutorial inside the idea, refactoring a bit, defined a better use of the C++/lua data communication class library;

http://blog.csdn.net/xiaominghimi/article/details/8816887

Below I directly paste function, everybody to pick up:

PublicSendLuaData.h

publicsendluadata.cpp////Lua and c++/c interaction class #ifndef __publicsendluadata__#define __publicsendluadata__#include " Cocos2d.h "using namespace cocos2d;using namespace Std;extern" C "{#include" lua.h "#include" lualib.h "#include"        Lauxlib.h "};class publicsendluadata{public:static publicsendluadata* getinstance (); /* Directly get the LUA variable name value filename luafilename variable name varName */const char* getluavarstring (const char* Luafilename,con        St char* VarName);  /* Gets the node name in a table in Lua, even the method file name Luafilename method name varname section name */const char* getluavaroneoftable (const char*        Luafilename,const char* varname,const char* keyName); /* Call LUA Global table LUA file name luafilename table variable name varname */const char* getluavartable (const char* Luafilename        , const char* varName); /* with parameter return file name Luafilename method name functionname parameter sequence arraypar parameter type Arraypartype */const char* Callluafu Ncparreturn (const char* luafilename,const char* Functionname,ccarray* arraypar,ccarray* Arraypartype); /* with parameter no return file name Luafilename method name functionname parameter sequence arraypar parameter type Arraypartype */const void Callluafun        Cpar (const char* luafilename,const char* functionname,ccarray* arraypar,ccarray* arraypartype);    private:static bool _isfirst;    Static publicsendluadata* m_instance;    Const char* Getfilefullpath (const char* fileName); ~publicsendluadata ();}; #endif

PublicSendLuaData.cpp

publicsendluadata.cpp////Created by zisou-ysj////Lua and c++/c Interactive class # include "PublicSendLuaData.h" #include "Ccluaeng Ine.h "publicsendluadata* publicsendluadata::m_instance = NULL; publicsendluadata* publicsendluadata::getinstance () {if (!m_instance) {m_instance = new Publicsendlua    Data (); } return m_instance;}  Get variable Name Value const char* publicsendluadata::getluavarstring (const char* luafilename,const char* varName) {lua_state* ls        = Ccluaengine::d efaultengine ()->getluastack ()->getluastate ();    int isOpen = Lual_dofile (ls, Getfilefullpath (luafilename));        if (isopen!=0) {cclog ("Open Lua Error:%i", IsOpen);    return NULL;    } lua_settop (LS, 0);        Lua_getglobal (LS, varName);    int statescode = lua_isstring (ls, 1);        if (statescode!=1) {cclog ("Open Lua Error:%i", Statescode);    return NULL;    } const char* str = lua_tostring (ls, 1);        Lua_pop (LS, 1); return str;} Const char* Publicsendluadata::geTluavaroneoftable (const char* luafilename,const char* varname,const char* keyName) {lua_state* ls = ccluaengine::d        Efaultengine ()->getluastack ()->getluastate ();    int isOpen = Lual_dofile (ls, Getfilefullpath (luafilename));        if (isopen!=0) {cclog ("Open Lua Error:%i", IsOpen);    return NULL;        } lua_getglobal (LS, varName);    int statescode = lua_istable (ls,-1);        if (statescode!=1) {cclog ("Open Lua Error:%i", Statescode);    return NULL;    } lua_pushstring (LS, keyName);    Lua_gettable (LS,-2);        Const char* valuestring = lua_tostring (ls,-1);        Lua_pop (LS,-1); return valuestring;} Execute LUA table, return table structure const char* publicsendluadata::getluavartable (const char* luafilename,const char* varName) {lua_state* L        s = ccluaengine::d efaultengine ()->getluastack ()->getluastate ();    int isOpen = Lual_dofile (ls, Getfilefullpath (luafilename));        if (isopen!=0) {cclog ("Open Lua Error:%i", IsOpen); Return NULL;        } lua_getglobal (LS, varName);    int it = lua_gettop (LS);        Lua_pushnil (LS);        String result= "";        while (Lua_next (LS, it)) {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 ();} The Execute LUA method with parameters has a return value of const char* Publicsendluadata::callluafuncparreturn (const char* luafilename,const char* functionname, ccarray* arraypar,ccarray* arraypartype) {lua_state* ls = ccluaengine::d efaultengine ()->getluastack ()        Getluastate ();    int isOpen = Lual_dofile (ls, Getfilefullpath (luafilename));        if (isopen!=0) {cclog ("Open Lua Error:%i", IsOpen);    return NULL;    } lua_getglobal (LS, functionname);    int countnum = Arraypar->count (); if (countnum>0) {for (int i = 0; I<arraypar->count (); i++) {ccstring* typestr = (ccstring*) Arraypartype->Objectatindex (i);            ccstring* Strnr = (ccstring*) arraypar->objectatindex (i); if (Typestr->isequal (Ccstring::create ("string"))) {lua_pushstring (LS, strnr->getcstring ())            ; } else if (Typestr->isequal (ccstring::create ("int"))) {Lua_pushnumber (LS, STRNR-&G            T;intvalue ()); } else if (Typestr->isequal (ccstring::create ("bool"))) {Lua_pushboolean (LS, strnr-            >boolvalue ());        }}}//Lua_call first parameter: Number of arguments to function second parameter: Number of function return values */Lua_call (LS, countnum, 1);        Const char* Iresult = lua_tostring (ls,-1); return iresult;} Execute Lua method with parameter no return value const void Publicsendluadata::callluafuncpar (const char* luafilename,const char* Functionname,ccarray        * arraypar,ccarray* arraypartype) {lua_state* ls = ccluaengine::d efaultengine ()->getluastack ()->getLuaState (); int isOpen = Lual_dofile (ls, getfilefullPath (Luafilename));    if (isopen!=0) {cclog ("Open Lua Error:%i", IsOpen);    } lua_getglobal (LS, functionname);    int countnum = Arraypar->count (); if (countnum>0) {for (int i = 0; I<arraypar->count (); i++) {ccstring* typestr = (ccstring*)            Arraypartype->objectatindex (i);            ccstring* Strnr = (ccstring*) arraypar->objectatindex (i); if (Typestr->isequal (Ccstring::create ("string"))) {lua_pushstring (LS, strnr->getcstring ())            ; } else if (Typestr->isequal (ccstring::create ("int"))) {Lua_pushnumber (LS, STRNR-&G            T;intvalue ()); } else if (Typestr->isequal (ccstring::create ("bool"))) {Lua_pushboolean (LS, strnr-            >boolvalue ()); }}}//Lua_call first parameter: Number of arguments to function second parameter: Number of function return values */Lua_call (LS, countnum, 0); }const char* Publicsendluadata::getfilefullpath (cOnst char* fileName) {return ccfileutils::sharedfileutils ()->fullpathforfilename (filename). C_STR ();}    Publicsendluadata::~publicsendluadata () {cc_safe_delete (m_instance); M_instance=null;}

There are comments on the above, I will not go into detail one by one, but the above method can meet the majority of the requirements of the C + + access to LUA;

I'll just say one example here:

ccarray* Arraypar = Ccarray::create () arraypar->addobject (ccstring::create ("parameter value")); ccarray* arraytype =ccarray::create (); Arraytype->addobject (Ccstring::create ("string")); Publicsendluadata::getinstance ()->callluafuncpar ("Lua filename", "parameter name", Arraypar, arraytype);

This is a specific call to LUA inside a parameter global method of the statement;

I wrote a type-matching method:

if (Typestr->isequal (Ccstring::create ("string")))            {                lua_pushstring (LS, strnr->getcstring ());            }            else if (Typestr->isequal (ccstring::create ("int")))            {                lua_pushnumber (LS, strnr->intvalue ());            }            else if (Typestr->isequal (ccstring::create ("bool")))            {                Lua_pushboolean (LS, strnr->boolvalue ());            }

When you use it, pay attention to match this to the line;

What if we were to access C + + functions in Lua? Remember the first part of my article that Lua calls the C + + function class method?

I advocate using the tolua++ tool class to sit LUA access C + +;

Cocos2dx-c++ and LUA data communication