C/C++读取Lua中的变量及调用Lua函数

config.lua

print('--In Lua--')

local a = -10
print('--math.abs(a)--',math.abs(a))

width = 1080
height = 720

name = "iphone"
numStr = 12345

function test1()
print('--function test1--')
end

function test2(var)
print('--function test2--')
print('--var--',var)
end

function test3()
print('--function test3--')
return "调用了lua function test3"
end

function test4(var)
print('--function test4--')
local num = tonumber(var)
    num = num + 10
return num
end

function test5(var)
print('--function test5--')
local t = 10
    var = var + 100
return t , var
end

function test6(x,y)
print('--function test6--')
print('--x--y--',x,y)
return x + y
end

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//// 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();    // 读取Lua中的变量    void getConfigWidthAndHeight(int* width,int* height);    // 调用Lua中的函数 无参无返回值    void callLuaFunction1();    // 调用Lua中的函数 无返回值 有一个参数    void callLuaFunction2();    // 调用Lua中的函数 无参数 有一个返回值    void callLuaFunction3();    // 调用Lua中的函数 有一个参数 有一个返回值    void callLuaFunction4();    // 调用Lua中的函数 有一个参数 有多个返回值    void callLuaFunction5();    // 调用Lua中的函数 有多个参数 有一个返回值    void callLuaFunction6();private:    LuaEngine():m_pLuaState(NULL){};    void init();    std::string getFilePath(std::string fileName);    lua_State* m_pLuaState;};#endif /* defined(__LuaAndCpp__LuaEngine__) */

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//// 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());// lua_pcall(m_pLuaState, 0, 0, 0);}std::string LuaEngine::getFilePath(std::string fileName){    return "/Users/Forest/Documents/LuaAndCpp/LuaAndCpp/scripts/" + fileName ;}void LuaEngine::getConfigWidthAndHeight(int* pWidth,int* pHeight){    // 获取Lua文件中的全局变量    lua_getglobal(m_pLuaState, "width");    // -1 栈顶位置 lua_isnumber 检测是否能转换成数字类型    if (lua_isnumber(m_pLuaState, -1)) {        int width = (int)lua_tonumber(m_pLuaState, -1);        std::cout << "width = " << width << std::endl;        *pWidth = width;    }    lua_pop(m_pLuaState, 1);    lua_getglobal(m_pLuaState, "height");    if (lua_isnumber(m_pLuaState, -1)) {        int height = (int)lua_tonumber(m_pLuaState, -1);        std::cout << "height = " << height << std::endl;        *pHeight = height;    }    lua_pop(m_pLuaState, 1);    lua_getglobal(m_pLuaState, "name");    if (lua_isstring(m_pLuaState, -1)) {        char* str = (char*)lua_tostring(m_pLuaState, -1);        std::cout << "name = " << str << std::endl;    }    lua_pop(m_pLuaState, 1);    // Lua中的 numStr 是 number 类型    // lua_isstring 不是判断是不是字符串类型，而是检测是否能转换成字符串类型    lua_getglobal(m_pLuaState, "numStr");    if (lua_isstring(m_pLuaState, -1)) {        char* str = (char*)lua_tostring(m_pLuaState, -1);        std::cout << "numStr = " << str << std::endl;    }    lua_pop(m_pLuaState, 1);}// 调用Lua中的函数 无参无返回值void LuaEngine::callLuaFunction1(){    lua_getglobal(m_pLuaState, "test1");    // 0 参数 0 返回值    int rel = lua_pcall(m_pLuaState, 0, 0, -1);    if (rel == -1) {        std::cout << "callLuaFunction1 error \n";    }}// 调用Lua中的函数 无返回值 有一个参数void LuaEngine::callLuaFunction2(){    lua_getglobal(m_pLuaState, "test2");    lua_pushstring(m_pLuaState, "调用了function test2");    int rel = lua_pcall(m_pLuaState, 1, 0, -1);    if (rel == -1) {        std::cout << "callLuaFunction2 error \n";    }}// 调用Lua中的函数 无参数 有一个返回值void LuaEngine::callLuaFunction3(){    lua_getglobal(m_pLuaState, "test3");    int rel = lua_pcall(m_pLuaState, 0, 1, -1);    if (rel == -1) {        std::cout << "callLuaFunction3 error \n";    }    char* str = (char*)lua_tostring(m_pLuaState, -1);    std::cout << "lua function test3 返回值 -- " << str << std::endl;}// 调用Lua中的函数 有一个参数 有一个返回值void LuaEngine::callLuaFunction4(){    lua_getglobal(m_pLuaState, "test4");    // 传参    lua_pushnumber(m_pLuaState, 10);    int rel = lua_pcall(m_pLuaState, 1, 1, -1);    if (rel == -1) {        std::cout << "callLuaFunction4 error \n";    }    int num = (int)lua_tonumber(m_pLuaState, -1);    std::cout << "lua function test4 返回值 -- " << num << std::endl;}// 调用Lua中的函数 有一个参数 有多个返回值void LuaEngine::callLuaFunction5(){    lua_getglobal(m_pLuaState, "test5");    lua_pushnumber(m_pLuaState, 10);    int rel = lua_pcall(m_pLuaState, 1, 2, -1);    if (rel == -1) {        std::cout << "callLuaFunction5 error \n";    }    int t = (int)lua_tonumber(m_pLuaState, -2);    int var = (int)lua_tonumber(m_pLuaState, -1);    std::cout << "lua function test5 返回值 -- t , var " << t << " " << var << std::endl;}// 调用Lua中的函数 有多个参数 有一个返回值void LuaEngine::callLuaFunction6(){    lua_getglobal(m_pLuaState, "test6");    lua_pushnumber(m_pLuaState, 10);    lua_pushnumber(m_pLuaState, 13);    int rel = lua_pcall(m_pLuaState, 2, 1, -1);    if (rel == -1) {        std::cout << "callLuaFunction6 error \n";    }    if (lua_isnumber(m_pLuaState, -1)) {        int num = (int)lua_tonumber(m_pLuaState, -1);        std::cout << "x+y== " << num << std::endl;        lua_pop(m_pLuaState, 1);    }}

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//// 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();    int width = 0;    int height = 0;    luaEngine->getConfigWidthAndHeight(&width,&height);    std::cout << "getConfigWidthAndHeight = " << width << " " << height << std::endl;    luaEngine->callLuaFunction1();    luaEngine->callLuaFunction2();    luaEngine->callLuaFunction3();    luaEngine->callLuaFunction4();    luaEngine->callLuaFunction5();    luaEngine->callLuaFunction6();    LuaEngine::destroyInstance();    return 0;}

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运行结果

Hello, World!
--In Lua--
--math.abs(a)-- 10
width = 1080
height = 720
name = iphone
numStr = 12345
getConfigWidthAndHeight = 1080 720
--function test1--
--function test2--
--var-- 调用了function test2
--function test3--
lua function test3 返回值 -- 调用了lua function test3
--function test4--
lua function test4 返回值 -- 20
--function test5--
lua function test5 返回值 -- t , var  10 110
--function test6--
--x--y--    10  13
x+y== 23
Program ended with exit code: 0

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