Lua & C++

anonymous_user_643afe49 · December 18, 2016, 4:18pm

Hi guys, how can i add lua scripts in my c++ game?

anonymous_user_643afe49 · December 18, 2016, 8:44pm

for this code:

#pragma once
include <iostream>

include “lua/lua.hpp” //needed for Lua

//
/ LuaEngine class
/
/ implements a wrapper around the lua state object required
/ to run user defined lua scripts. It is a non-copyable class
/ as the application should only include one instance of the engine
/ and execute scripts on that engine’s state
/******/
class LuaEngine
{
public:
//Constructor
LuaEngine(void) : m_L(luaL_newstate()) { luaL_openlibs(m_L); }
LuaEngine(const LuaEngine& other); //non-construction copy
LuaEngine& operator=(const LuaEngine&); //non-copy
~LuaEngine(void) { lua_close(m_L); } //Destructor clean-up
									 //returns lua state object
lua_State* L();

//Execute Lua File
void ExecuteFile(const char* file);

//Execute Lua Expression (contained in string)
void ExecuteString(const char* expression);
private:
//member lua state
lua_State* m_L;

private:
//handle errors
void report_errors(int state);
};

include “LuaEngine.h”

//returns lua state object
lua_State* LuaEngine::L()
{
return m_L;
}

//helper function to report errors in evaluated lua scripts
void LuaEngine::report_errors(int state)
{
if (state != 0)
{
std::cerr << "ERR: " << lua_tostring(m_L, state) << std::endl;
lua_pop(m_L, 1); //remove error
}
}

//executes a lua script file
void LuaEngine::ExecuteFile(const char* file)
{
if (file == NULL)
return;
int state = luaL_dofile(m_L, file);
report_errors(state);
}

//execute a lua expression contained in string
//
//(could contain a full script with line breaks)
void LuaEngine::ExecuteString(const char* expression)
{
if (expression == NULL)
{
std::cerr << “ERR: null expression passed to script engine!” << std::endl;
return;
}
int state = luaL_dostring(m_L, expression);
report_errors(state);
}

include “LuaEngine.h”

//macro definition for safe deletion of pointer object
#define SAFE_DELETE(x) { if(x) delete x; x = nullptr; }

//entry point for application
int main()
{
//create lua engine
LuaEngine* engine = new LuaEngine();
//execute specified file file
engine-&gt;ExecuteFile("test.lua");

SAFE_DELETE(engine); //delete engine from memory

system("PAUSE"); //&lt;iostream&gt;: function waits for user input
return 0;
}

im getting error: LNK1120
LNK2019