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main.cpp
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executable file
·204 lines (177 loc) · 3.97 KB
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#include<iostream>
using namespace std;
extern "C"{
#include<lua.h>
#include<lualib.h>
#include<lua.hpp>
};
#pragma comment(lib,"lua5.1.lib")
void test1(lua_State* L)
{
luaL_dostring(L,"function showstr(str) print(str) end");
luaL_dostring(L,"function add(x,y) return x+y end");
const char *pstr = "hello edward";
lua_getglobal(L,"showstr");
lua_pushstring(L,pstr);
lua_pcall(L,1,0,0);
lua_getglobal(L,"add");
lua_pushinteger(L,2);
lua_pushinteger(L,3);
lua_pcall(L,2,1,0);
printf("lua add function return val is %d\n",lua_tointeger(L,-1));
}
void luaParser2(lua_State* L)
{
char buff[256];
int error;
while(fgets(buff,256,stdin) != NULL)
{
error = luaL_loadbuffer(L,buff,strlen(buff),"line") || lua_pcall(L,0,0,0);
if(error)
{
fprintf(stderr,"%s",lua_tostring(L,-1));
lua_pop(L,1);
}
}
}
void luaParser(lua_State* L)
{
char buff[256];
int error;
while(fgets(buff,sizeof(buff),stdin) != NULL)
{
error = luaL_loadbuffer(L,buff,strlen(buff),"line") || lua_pcall(L,0,0,0);
if(error)
{
fprintf(stderr,"%s",lua_tostring(L,-1));
lua_pop(L,1);
}
}
}
/// 从栈底到栈顶依次遍历整个堆栈
static void stackDump(lua_State *L)
{
int i;
int top = lua_gettop(L);
for(i = 1; i <= top; i++)
{
int t = lua_type(L,i);
switch(t)
{
case LUA_TSTRING:
printf("%s",lua_tostring(L,i));
break;
case LUA_TBOOLEAN:
printf(" %g", lua_toboolean(L,i)? "true":"false");
break;
case LUA_TNUMBER:
printf(" %g",lua_tonumber(L,i));
break;
default:
printf(" %s",lua_typename(L,t));
break;
}
printf(" ");
}
printf("\n");
}
void testDumpStack(lua_State *L)
{
lua_pushboolean(L,1);
lua_pushnumber(L,10);
lua_pushstring(L,"hello");
stackDump(L);
lua_pushvalue(L,-4);
stackDump(L);
lua_replace(L,3);
stackDump(L);
lua_settop(L,6);
stackDump(L);
lua_remove(L,-3);
stackDump(L);
}
void oper_table(lua_State* L)
{
}
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,char* filename, int* width, int* height)
{
if(luaL_loadfile(L,filename) || lua_pcall(L,0,0,0))
{
error(L,"cannot run configure file %s",lua_tostring(L,-1));
}
lua_getglobal(L,"width");
lua_getglobal(L,"height");
if(!lua_isnumber(L,-2))
error(L,"width should be a number");
if(!lua_isnumber(L,-1))
error(L,"height should be a number");
*width =(int)lua_tonumber(L,-2);
*height =(int)lua_tonumber(L,-1);
}
double cppCallLuaFunc(lua_State*L, double x, double y)
{
double z;
lua_getglobal(L,"f");
lua_pushnumber(L,x);
lua_pushnumber(L,y);
if(lua_pcall(L,2,1,0) != 0)
error(L,"error running func f ： %s", lua_tostring(L,-1));
z = lua_tonumber(L,-1);
lua_pop(L,1);
return z;
}
int cppCallLuaFuncAndGetValueX(lua_State* L)
{
int x ;
lua_getglobal(L,"printMsg");
if(lua_pcall(L,0,0,0) != 0)
error(L,"error runing func f: %s",lua_tostring(L,-1));
lua_getglobal(L,"x");
x = lua_tointeger(L,-1);
lua_pop(L,1);
return x;
}
void access_lua_table(lua_State* L)
{
printf("%d",lua_gettop(L));
lua_getglobal(L,"me");
if(!lua_istable(L,-1))
{
printf("error in table ");
return;
}
/// 往栈里面压入一个key:name
lua_pushstring(L,"name");
lua_gettable(L,-2);
printf("name = %s",lua_tostring(L,-1));
}
int main()
{
lua_State *L = NULL;
L = lua_open();
luaL_openlibs(L);
///test1(L);
///luaParser(L);
////testDumpStack(L);
int width, height;
load(L,"cfg.lua",&width,&height);
printf("width = %d height = %d \n",width,height);
double z = cppCallLuaFunc(L,1.0,2.0);
int x = cppCallLuaFuncAndGetValueX(L);
printf("cpp call lua function return value :%f\n",z);
printf("cpp call lua function return value :%d\n",x);
printf("---------------------------------\n");
access_lua_table(L);
///oper_table(L);
lua_close(L);
return 0;
}