lua call dll demo

Using lua5.3

DllMain.cpp

 1 //生成的dll  是   lua_add53.dll
 2 //luaopen_lua_add
 3 extern "C" {
 4 #include "F:/lua_src/lua-5.3.5_Win64_vc15_lib/include/lua.h"  
 5 #include "F:/lua_src/lua-5.3.5_Win64_vc15_lib/include/lualib.h"  
 6 #include "F:/lua_src/lua-5.3.5_Win64_vc15_lib/include/lauxlib.h"
 7 };
 8 #pragma comment(lib, "F:/lua_src/lua-5.3.5_Win64_vc15_lib/lua53.lib")
 9 
10 #include <iostream>  
11 using namespace std;
12 
13 extern "C" int ShowMsg(lua_State* luaEnv) {
14   cout << "Hello world from clibs!" << endl;
15   return 0; // 返回值个数为0个.  
16 }
17 
18 extern "C" int sub2(lua_State* L)
19 {
20   double op1 = luaL_checknumber(L, 1);
21   double op2 = luaL_checknumber(L, 2);
 22 is    int TEMP = OP1 - OP2;
 23 is    lua_pushnumber (L, TEMP);
 24    return  . 1 ;
 25  }
 26 is  
27  // Part One: To export a list of functions 
28  static luaL_Reg luaLibs [] = {
 29      { " ShowMsg " , } ShowMsg,
 30      { " SUB2 " , SUB2},
 31 is      {NULL, NULL}
 32  };
 33 is  
34 is  // Part TWO: DLL entry function, Lua calls associated with this DLL.   
35  extern  " C "__declspec (dllexport)
 36  int luaopen_lua_add (lua_State * luaEnv) {    // WinFeature is modole name, the name of the future require
 37    // lua_register (luaEnv, "ShowMsg", ShowMsg);   // critical line on luaState up for good this lib
 38 is    // lua_register (luaEnv, "SUB2", SUB2);   // key line, the good registration on luaState lib 
39    lua_newtable (luaEnv);
 40    luaL_setfuncs (luaEnv, luaLibs, 0 );
 41 is    return  . 1 ;
 42 is }

After compilation is lua_add53.dll

take

1 local mytest = require "lua_add"
2 mytest.ShowMsg();
3 print(mytest.sub2(1,2));