Lua编程示例（五）： C语言对Lua表的读取和添加

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#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：

复制代码 代码如下:
background = {r=1,g=0.5,b=0.7} 

运行输出结果为：

The background color : red = 1.00 ,green = 0.50 ,blue = 0.70The WIETH color : red = 1.00 ,green = 1.00 ,blue = 1.00The BLUE color : red = 0.00 ,green = 0.00 ,blue = 1.00