lua socket c++ socket效率怎样

一.lua调用C++在lua中是以函数指针的形式调用函数,并且所有的函数指针都必须满足如下此种类型:typedefint(*lua_CFunction)(lua_State*L);　　也就是说,偶们在C++中定义函数时必须以lua_State为参数,以int为返回值才能被Lua所调用.但是不要忘记了,偶们的lua_State是支持栈的,所以通过栈可以传递无穷个参数,大小只受内存大小限制.而返回的int值也只是指返回值的个数真正的返回值都存储在lua_State的栈中.偶们通常的做法是做一个wrapper,把所有需要调用的函数都wrap一下,这样就可以调用任意的函数了.[cpp]viewplaincopy#includeusingnamespacestd;#includeextern"C"{#include#include#include}//#pragmacomment(lib,"lua5.1.lib")lua_State*L;staticintaverage(lua_State*L){//返回栈中元素的个数intn=lua_gettop(L);doublesum=0;inti;for(i=1;iextern"C"{#include"lua.h"#include"lualib.h"#include"lauxlib.h"}/*Lua解释器指针*/lua_State*L;intmain(intargc,char*argv[]){/*初始化Lua*/L=lua_open();/*载入Lua基本库*/luaL_openlibs(L);/*运行脚本*/luaL_dofile(L,"Lua1.lua");/*清除Lua*/lua_close(L);/*暂停*/printf("Pressentertoexit…");getchar();return0;}[cpp]viewplaincopy/*AsimpleLuainterpreter.*/#includeextern"C"{#include#include#include}#includeextern"C"{//这是个C++程序,所以要extern"C",//因为lua的头文件都是C格式的#include"lua.h"#include"lualib.h"#include"lauxlib.h"}#pragmacomment(lib,"lua5.1.lib")/*theLuainterpreter*/lua_State*L;intluaadd(intx,inty){intsum;/*thefunctionname*/lua_getglobal(L,"add");intnTop=lua_gettop(L);//得到栈的元素个数。栈顶的位置。/*thefirstargument*/lua_pushnumber(L,x);nTop=lua_gettop(L);/*thesecondargument*/lua_pushnumber(L,y);nTop=lua_gettop(L);/*callthefunctionwith2arguments,return1result*/lua_call(L,2,1);nTop=lua_gettop(L);/*gettheresult*/sum=(int)lua_tonumber(L,-1);nTop=lua_gettop(L);/*清掉返回值*/lua_pop(L,1);nTop=lua_gettop(L);/*取出脚本中的变量z的值*/lua_getglobal(L,"z");nTop=lua_gettop(L);intz=(int)lua_tonumber(L,1);nTop=lua_gettop(L);lua_pop(L,1);nTop=lua_gettop(L);//没调通/*lua_pushnumber(L,4);nTop=lua_gettop(L);lua_setglobal(L,"r");nTop=lua_gettop(L);intr=(int)lua_tonumber(L,1);nTop=lua_gettop(L);*/returnsum;}intmain(intargc,char*argv[]){intsum;/*initializeLua*/L=lua_open();/*loadLuabaselibraries*///lua_baselibopen(L);/*loadthescript*/luaL_dofile(L,"e12.lua");/*calltheaddfunction*/sum=luaadd(10,15);/*printtheresult*/printf("Thesumis%d",sum);/*cleanupLua*/lua_close(L);return0;}/*程序说明:main中过程偶们上次已经说过了,所以这次只说说luaadd的过程*首先用lua_getglobal()把add函数压栈*然后用lua_pushnumber()依次把x,y压栈*然后调用lua_call(),并且告诉程序偶们有两个参数一个返回值*接着偶们从栈顶取回返回值,用lua_tonumber()*最后偶们用lua_pop()把返回值清掉*/脚本为：--addtwonumbersfunctionadd(x,y)returnx+y+2endz=6