A trick. C + + Call LUA code profile function (with code)

There are two functions in the Lua file, then call the code with the CPP file, finally, there is a critical step, compile, we need to add additional options: g++ main.cpp-o main-llua-ldl. The process looks simple and requires hands-on operation.

First you install the Lua dev, which is simple to install:

Yum Install Lua-devel

Well, many Linux systems have lua but no dev and a little pit.

Here is the Lua file, which has two functions:

function Add (A, B)    return a + b endfunction hello ()    print ("Hello Lua!!!") End

After that is the call code for the CPP file:

 #include <iostream> #include <string>using std::cout;using std:: Endl;using Std::string;//extern, use the following file as a C-style file using extern "C" {#include <lua.h> #include <lauxlib.h> #inc    Lude<lualib.h>}int Main () {//create environment Lua_state *l = Lual_newstate ();        if (L = = NULL) {cout << "state error" << Endl;     return-1;    }//Load library lual_openlibs (L);    Const string file = "Func.lua";    Load file int ret = Lual_dofile (L, File.c_str ());        if (ret) {cout << "Dofile error" << Endl;     return-1;    } The//hello function does not have parameters, call Lua_getglobal (L, "hello") directly; Lua_pcall (L, 0, 0, 0);      Three 0 meanings, 0 arguments, 0 return value, 0 custom error handling Lua_getglobal (L, "add");      Two parameters are passed to the Add function, 1 and 2 are passed directly, and the variable is OK lua_pushnumber (L, 1);     Lua_pushnumber (L, 2);            Lua_pcall (l,2,1,0);    The return value is placed in the position of-1 cout << lua_tonumber (L,-1) << Endl;    Lua_close (L); return 0;} 

Finally, there is a critical step, and we need to add additional options when compiling:

g++ main.cpp-o MAIN-LLUA-LDL

Look at the results:

Done