Lua and C + + call each other

{--1, Environment-}

For quick Start, a small, fast vc++6.0 compiler is used

and download the LUA installation package on the official website. Official Address {--http://10.21.210.18/seeyon/index.jsp--}

When both are installed, they can be

{--2, engineering, and configuration--}

1, first use vc++6.0 to create a simple Win32 Console application

2. From the installation directory of LUA, copy the files from the include and Lib two directories into the directory of the project you just created.

{include: the. h header file containing Lua}

{lib: dynamic-link library dll with LUA}

3, in order to make vc++6.0 compile and link to find the required LUA file

{Add all the. h files that you just copied over the project to ensure that the compilation passes}

{Set dll{project in compiler-set-object/library module last add lua5.1.lib lua51.lib, guarantee link through}}

{--3, C + + and Lua invoke each other example-}

To invoke Lua, first we have to write a simple Lua file and save the file to a path, such as the path {F:\\lua}

function Add (x, y)     = clib ();//About Clib () is a C function that will be introduced later.     Print ("Thefirstarg"). N1);     Print ("Thesecond arg"). N2);    return x + yEnd

This function is used to calculate the and of the two parameters x, Y, passed from the C function.

In addition, this function also demonstrates how to invoke Lua to invoke C function clib () for convenience.

Next we start writing the main function

#include <stdlib.h>//This is a C + + program, so to extern "C",//Because LUA header files are in C format extern "C" {#include "lua.h" #include "lualib.h" # Include "Lauxlib.h"}lua_state* L; /* The LUA interpreter *///C function called to LUA must be defined as static int XXX (lua_state *l) static int clib (Lua_state *l) {Lua_pushnumber　　(L, 100);    Lua_pushnumber (L, 200); return 2;
Lua calls the function to fetch 2 results from the stack}
Here C + + calls the LUA function int luaadd (int x, int. y) {int sum;/* the function name */lua_getglobal (L, "add");
/* The first argument */lua_pushnumber (L, x);
/* The second argument */lua_pushnumber (L, y);
/* Call the function with 2 arguments, return 1 result *///description called functions are with 2 parameters and a return value Lua_call (L, 2, 1);/* Get the result */sum = (int) Lua_tonumber (l,-1); Lua_pop (L, 1); return sum;} int main (int argc, char* argv[]) {int sum;/* initialize Lua */l = Lual_newstate ();//Create a pointer to the LUA interpreter/* Load LUA base libra Ries */lual_openlibs (L); Lua_register (L, "Clib", clib);
/* Load the script *//*lcc.lua is a LUA file called by this C + + program, note that the second parameter of the Lual_dofile () function is to write an absolute path, otherwise it will prompt "unprotected error API (Attampt to call a nil value) "Error */lual_dofile (L," F:\\lua\\lcc.lua ");/* Call the Add function */sum = Luaadd (10, 15); * Print the result */printf ("The sum is%d\n", sum);/* Cleanup Lua */lua_close (L); System ("pause"); return 0;}

The Clib () function above is the function to be called in the Lua file

Key code: Lua_register (L, "Clib", clib); registers the function in the LUA stack so that LUA can invoke it.

and how C + + calls Lua

Key codes: Lual_dofile () and Luaadd () functions

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by Alwaystiys.

From 2014.09.05

At Gz.

Lua and C + + call each other