Created
March 29, 2013 02:27
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C++与Lua之间的相互调用接口
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| /*先是C++调用Lua。 | |
| */ | |
| extern "C" { | |
| #include "lua.h" | |
| #include "lualib.h" | |
| #include "lauxlib.h" | |
| } | |
| #include <cstdio> | |
| using std::printf; | |
| int main() | |
| { | |
| lua_State* L = luaL_newstate(); | |
| luaL_openlibs(L); | |
| printf("Press any key to run the \'add.lua\' file!\n"); | |
| luaL_dofile(L, "add.lua"); | |
| lua_getglobal(L, "add"); | |
| lua_pushnumber(L, 10); | |
| lua_pushnumber(L, 20); | |
| lua_pcall(L, 2, 1, 0); | |
| int sum = (int)lua_tonumber(L, -1); | |
| printf("The stack size is %d\n", lua_gettop(L)); | |
| lua_pop(L, 1); | |
| printf("The result is %d\n", sum); | |
| lua_close(L); | |
| return 1; | |
| } | |
| /*相应的lua文件为： | |
| function add(a, b) | |
| return a + b | |
| end | |
| */ | |
| ///////////////////////////////////////////////////////////////////////////// | |
| /*然后是使用C++给Lua写扩展库 | |
| */ | |
| extern "C" { | |
| #include "lua.h" | |
| #include "lualib.h" | |
| #include "lauxlib.h" | |
| } | |
| namespace { | |
| extern "C" int l_add2(lua_State* L) | |
| { | |
| double op1 = lua_tonumber(L, 1); | |
| double op2 = lua_tonumber(L, 2); | |
| lua_pushnumber(L, op1 + op2); | |
| return 1; | |
| } | |
| extern "C" int l_sub2(lua_State* L) | |
| { | |
| double op1 = lua_tonumber(L, 1); | |
| double op2 = lua_tonumber(L, 2); | |
| lua_pushnumber(L, op1 - op2); | |
| return 1; | |
| } | |
| const struct luaL_Reg mylib[] = { | |
| {"myadd", l_add2}, | |
| {"mysub", l_sub2}, | |
| {NULL, NULL} | |
| }; | |
| } | |
| //该C库的唯一入口函数。其函数签名等同于上面的注册函数。见如下几点说明： | |
| //1. 我们可以将该函数简单的理解为模块的工厂函数。 | |
| //2. 其函数名必须为luaopen_xxx，其中xxx表示library名称。Lua代码require "xxx"需要与之对应。 | |
| //3. 在luaL_register的调用中，其第一个字符串参数为模块名"xxx"，第二个参数为待注册函数的数组。 | |
| //4. 需要强调的是，所有需要用到"xxx"的代码，不论C还是Lua，都必须保持一致，这是Lua的约定， | |
| // 否则将无法调用。 | |
| extern "C" int luaopen_mylib(lua_State* L) | |
| { | |
| //luaL_register(L, "mylib", mylib); //这个是5.1以前的调用方式 | |
| luaL_newlib(L, mylib); //通过require来使用 | |
| return 1; | |
| } | |
| /*相应的Lua文件为： | |
| local lib = require "mylib" | |
| print(lib.myadd(1, 2)) | |
| print(lib.mysub(3, 2)) | |
| */ |
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