前面讲过Lua载入dll的方式去调用函数库,下面介绍的是函数压栈的方式调用函数库,通过lua_register把函数注册到lua的栈中,lua_register的定义如下,
#define lua_register(L,n,f) (lua_pushcfunction(L, (f)), lua_setglobal(L, (n)))
看了定义就知道,其实就是函数压栈,然后设置为全局变量,这样lua就可以调用它了。
// libforlua-2.cpp : 定义控制台应用程序的入口点。
//
#include "stdafx.h"
#include
#include
#include
#include
#include
//lua头文件
#ifdef __cplusplus
extern "C" {
#include "lua.h"
#include
#include
}
#else
#include
#include
#include
#endif
#pragma comment(lib, "lua51.lib")
static int math_abs(lua_State *L)
{
//获取传入的参数
lua_pushnumber(L, abs((int)luaL_checknumber(L, 1)));
return 1;
}
static int math_cos(lua_State *L)
{
lua_pushnumber(L, cos((double)luaL_checknumber(L, 1)));
return 1;
}
static int math_sin(lua_State *L)
{
lua_pushnumber(L, sin((double)luaL_checknumber(L, 1)));
return 1;
}
static const luaL_reg mathlib[] = {
{ "abs", math_abs },
{ "cos", math_cos },
{ "sin", math_sin },
{ NULL, NULL }
};
static int ShowMessage(lua_State * L)
{
lua_pushnumber(L, 1000);
printf("show message and push 1000 \n");
return -1;
}
int main(int argc, char** argv)
{
lua_State* L = lua_open();
luaL_openlibs(L);
// lua_register(L, "cos", math_cos);
// lua_register(L, "sin", math_sin);
// lua_register(L, "abs", math_abs);
//#define lua_register(L,n,f) (lua_pushcfunction(L, (f)), lua_setglobal(L, (n)))
luaL_register(L, "DY_MATH", mathlib);
char *luapath="./script/lua/lua.lua";
luaL_dofile(L, luapath);
double sinv = 30*3.1415926/180.0;
lua_getglobal(L, "SIN");
lua_pushnumber(L, sinv);
if (0 != lua_pcall(L, 1, 1, 0))
{
printf("cpp call lua function failed\n");
}
printf("sin(%f)=%f\n", sinv, lua_tonumber(L, -1));
lua_pop(L, 1);
lua_getglobal(L, "COS");
lua_pushnumber(L, 0.5);
if (0 != lua_pcall(L, 1, 1, 0))
{
printf("cpp call lua function failed\n");
}
printf("cos(0.5)=%f\n", lua_tonumber(L, -1));
lua_pop(L, 1);
//压栈后设置一个lua可调用的全局函数名
lua_pushcfunction(L, ShowMessage);
lua_setglobal(L, "showmessage");
//c调用lua
lua_getglobal(L, "SHOWMESSAGE");
lua_pcall(L, 0, 0, 0);
printf("get the showmessage pushed value %f \n", lua_tonumber(L, -1));
lua_close(L);
}
---------------------------------------------
--region lua.lua
--Date
--此文件由[BabeLua]插件自动生成
function COS(a)
print("called COS in lua script")
--lua调用c/c++
return DY_MATH.cos(a)
end
function SIN(a)
print("called SIN in lua script")
return DY_MATH.sin(a)
end
function SHOWMESSAGE()
showmessage()
end
--endregion
Lua 的详细介绍:请点这里
Lua 的下载地址:请点这里