C/C++遍历Lua中的table

config.lua

test_table = {
    name = 'app',
    age = 13
}

//
//  LuaEngine.h
//  LuaAndCpp
//

#ifndef __LuaAndCpp__LuaEngine__
#define __LuaAndCpp__LuaEngine__

#include <stdio.h>
#include <iostream>
#include "lua.hpp"

class LuaEngine {

public:

    ~LuaEngine();

    static LuaEngine* getInstance();

    static void destroyInstance();

    // 遍历table
    void readTestTable();
    // 得到table的key value
    void getTableInfo();
private:

    LuaEngine():m_pLuaState(NULL){};

    void init();

    std::string getFilePath(std::string fileName);

    lua_State* m_pLuaState;

    char* getFiled(lua_State* L,const char* key);

    int table_next(int idx,char*& key,char*& value);
};

#endif /* defined(__LuaAndCpp__LuaEngine__) */

//
//  LuaEngine.cpp
//  LuaAndCpp
//

#include "LuaEngine.h"

LuaEngine::~LuaEngine(){
    lua_close(m_pLuaState);
}

static LuaEngine* LuaEngine_instance = NULL;

LuaEngine* LuaEngine::getInstance(){
    if (LuaEngine_instance == NULL) {
        LuaEngine_instance = new LuaEngine();
        LuaEngine_instance->init();
    }
    return LuaEngine_instance;
}

void LuaEngine::destroyInstance(){
    if (LuaEngine_instance) {
        delete LuaEngine_instance;
        LuaEngine_instance = NULL;
    }
}

void LuaEngine::init(){
    m_pLuaState = luaL_newstate();
    luaL_openlibs(m_pLuaState);

    luaL_dofile(m_pLuaState, this->getFilePath("config.lua").c_str()); 
}

std::string LuaEngine::getFilePath(std::string fileName){
    return "/Users/Forest/Documents/LuaAndCpp/LuaAndCpp/scripts/" + fileName ;
}

// 遍历table
void LuaEngine::readTestTable(){
    lua_getglobal(m_pLuaState, "test_table");
    if (lua_istable(m_pLuaState, -1)) {
        char* name = this->getFiled(m_pLuaState, "name");
        char* age = this->getFiled(m_pLuaState, "age");
        int n_age = atoi(age);
        std::cout << "name = " << name << "\n" << "age = " << n_age << std::endl;
    }
}

char* LuaEngine::getFiled(lua_State *L, const char *key){
//    char* rlt = NULL;
    lua_pushstring(L , key);
    lua_gettable(L, -2);
    if (lua_isstring(L, -1)) {
        char* rlt = (char*)lua_tostring(L, -1);
        lua_pop(L, 1);
        return rlt;
    }
    return NULL;
}

// 得到table的key value
void LuaEngine::getTableInfo(){
    int t_idx = 0;
    char* key = NULL;
    char* value = NULL;

    lua_getglobal(m_pLuaState, "test_table");
    t_idx = lua_gettop(m_pLuaState);
    lua_pushnil(m_pLuaState);
    while (this->table_next(1,key,value) != 0) {
        std::cout << "key = " << key << "\n" << "value = " << value << std::endl;
    }
}

int LuaEngine::table_next(int idx,char*& key,char*& value){
    if (lua_next(m_pLuaState, idx) != 0) {
        key = (char*)lua_tostring(m_pLuaState, -2);
        value = (char*)lua_tostring(m_pLuaState, -1);
        lua_pop(m_pLuaState, 1);
        return 1;
    }
    return 0;
}

//
//  main.cpp
//  LuaAndCpp
//

#include <iostream>

#include "LuaEngine.h"

int main(int argc, const char * argv[]) {
    // insert code here...
    std::cout << "Hello, World!\n";

    LuaEngine* luaEngine = LuaEngine::getInstance();

    luaEngine->readTestTable();

    luaEngine->getTableInfo();

    LuaEngine::destroyInstance();

    return 0;
}

运行结果：

name = app
age = 13
key = name
value = app
key = age
value = 13