文件加载
c加载lua文件需要用到两个函数宏
luaL_loadfile(lua_State* L, const char* filename) //加载文件
lua_pcall(lua_State *L, int nargs, int nresults, int errfunc) //执行文件
代码示例:
load_test.lua
width=200
height=300
main.cc
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#ifdef __cplusplus
extern "C" {
#include "lua.h"
#include "lauxlib.h"
}
#endif // __cplusplus
void error(lua_State *L, const char* fmt, ...) {
va_list argp;
va_start(argp, fmt);
vfprintf(stderr, fmt, argp);
va_end(argp);
lua_close(L);
exit(EXIT_FAILURE);
}
void load(lua_State* L, const char* fname, int *w, int *h) {
if (luaL_loadfile(L, fname) || lua_pcall(L, 0, 0, 0)) {
//luaL_loadfile\lua_pcall 发生错误，两个函数都会把错误消息压入栈，并返回一个非零的错误代码，可以通过lua_tostring获得错误信息
error(L, "error cannot run config file:%s\n", lua_tostring(L, -1));
}
lua_getglobal(L, "width"); //将lua脚本中的全局变量 width 入栈
lua_getglobal(L, "height");
if (!lua_isnumber(L, -2)) {
error(L, "error width should be a number\n");
}
if (!lua_isnumber(L, -1)) {
error(L, "error height should be a number\n");
}
*w = lua_tointeger(L, -2);
*h = lua_tointeger(L, -1);
}
int main() {
lua_State* L = luaL_newstate();
int weight = 0;
int height = 0;
load(L, "./load_test.lua", &weight, &height);
printf("weight = %d, height = %d\n", weight, height);
lua_close(L);
system("pause");
}
