我要评论
#include "stdafx.h"
lua_state *l;
void load_lua(char *filename){
l=lual_newstate();
lual_openlibs(l);
if((lual_loadfile(l,filename) || lua_pcall(l,0,0,0))!= 0){
lual_error(l,"loadfile error! \n %s",lua_tostring(l,-1));
}
}
double getfield(lua_state *l,char * key){
double res;
//默认栈顶是table，将key入栈
lua_pushstring(l,key);
lua_gettable(l,-2); //查找键值为key的元素，置于栈顶
if(!lua_isnumber(l,-1)){
lual_error(l,"num get error! %s\n",lua_tostring(l,-1));
}
res = lua_tonumber(l,-1);
lua_pop(l,1); //删掉产生的查找结果
return res;
}
void setfield(lua_state *l,char *key,double value){
//默认栈顶是table
lua_pushstring(l,key);
lua_pushnumber(l,value);
lua_settable(l,-3); //将这一对键值设成元素
}
struct mycolor{
char *name;
unsigned char red,green,blue;
}color[]={
{"wieth",1,1,1},
{"black",0,0,0},
{"blue",0,0,1}
};
//先创建一个空的栈，填入元素，用lua_setglobal弹出表，并赋成全局变量
void setcolor(lua_state *l,struct mycolor col){
lua_newtable(l);
setfield(l,"r",col.red);
setfield(l,"g",col.green);
setfield(l,"b",col.blue);
lua_setglobal(l,col.name);
}
void getcolor(lua_state *l,char *key){
lua_getglobal(l,key);
if(!lua_istable(l,-1)){
lual_error(l,"'background' is not a table! %s\n",lua_tostring(l,-1));
}
double red;
double green;
double blue;
red = getfield(l,"r");
blue = getfield(l,"b");
green = getfield(l,"g");
printf("the %s color : red = %.2f ,green = %.2f ,blue = %.2f\n",key,red,green,blue);
}
int _tmain(int argc, _tchar* argv[])
{
load_lua("test.lua");
getcolor(l,"background");
int i = 0;
while(color[i].name != null){
setcolor(l,color[i]);
i++;
}
getcolor(l,"wieth");
getcolor(l,"blue");
return 0;
}
test.lua 中就一行代码：
运行输出结果为：
the background color : red = 1.00 ,green = 0.50 ,blue = 0.70 the wieth color : red = 1.00 ,green = 1.00 ,blue = 1.00 the blue color : red = 0.00 ,green = 0.00 ,blue = 1.00
发表评论