CAPI c++ 遍歷lua表

1.一些用來遍歷lua表的api簡介

以下是對下面幾個函數的認識不對請批評指正：

lua_istable:是否是一個表
lua_gettable(L,int index) ：把lua棧的索引為index表的lua棧的index+1所指的索引的值彈出。也就是彈出table[index+1];
lua_next(L,index)：先把 表(lua棧 index所指的表), 的當前索引彈出，再把table 當前索引的值彈出，也就是先彈出 table的索引，再彈出table索引的值

2.代碼示例

// lua_table_extent.cpp : 定義控制台應用程序的入口點。
//

#include "stdafx.h"
#include "stdafx.h"
#include "lua.hpp"
#include "lauxlib.h"
#include "lualib.h"
#include <string.h>
#include <windows.h>
#include <iostream>
using namespace std;
#pragma comment(lib,"lua5.1.lib")
#pragma comment(lib,"lua51.lib")


/*
luaJ_table.lua文件內容
----------------------------------------------
NUMBER_TABLE =
{ 11,
22,
33,
44,
}

NUMBER_TABLE_WITH_INDEX =
{
["a"] = 1,
["b"] = 2,
["c"] = 3
}


STRING_TABLE_WITH_INDEX =
{
["a"] = "this is a",
["b"] = "this is b",
["c"] = "this is c"
}
-----------------------------------------------
*/

int _tmain(int argc, _TCHAR* argv[])
{

    lua_State *L = luaL_newstate();
    luaL_openlibs(L);

    if(0 != luaL_loadfile(L,"lua_table.lua"))
    {
        printf("loadbuff error :%s",lua_tostring(L,-1));
        lua_pop(L,1);
    }

    if(0 != lua_pcall(L,0,0,0))
    {
        printf("pcall error :%s",lua_tostring(L,-1));
        lua_pop(L,1);
    }

    lua_getglobal(L,"STRING_TABLE_WITH_INDEX");
    /*此時lua棧狀態
    ----------------------------------
    |  -1 table NUMBER_TABLE
    ----------------------------------
    */

    if(!lua_istable(L,-1))
        cout<<"not a table"<<endl;
    /*此時lua棧狀態
    ----------------------------------
    |  -1 table NUMBER_TABLE
    ----------------------------------
    */

    lua_pushnumber(L,1);
    /*此時lua棧狀態
    ----------------------------------
    |  -1 1 key
    |  -2 table NUMBER_TABLE
    ----------------------------------
    */
    lua_gettable(L,-2);
    /*此時lua棧狀態
    ----------------------------------
    |  -1 1 Value
    |  -2 table NUMBER_TABLE
    ----------------------------------
    */
    if(lua_isnumber(L,-1))
        cout<<lua_tonumber(L,-1)<<endl;
    else if(lua_isstring(L,-1))
        cout<<lua_tostring(L,-1)<<endl;
    /*此時lua棧狀態
    ----------------------------------
    |  -1 1 Value
    |  -2 table NUMBER_TABLE
    ----------------------------------
    */
    lua_pop(L,1);
    /*此時lua棧狀態
    ----------------------------------
    |  -1 table NUMBER_TABLE
    ----------------------------------
    */


    //循環遍歷
    lua_pushnil(L);
    /*此時lua棧狀態
    ----------------------------------
    |  -1 nil
    |  -2 table NUMBER_TABLE
    ----------------------------------
    */
    while(lua_next(L,-2))
    {
    /*此時lua棧狀態
    ----------------------------------
    |  -1 value
    |  -2 key
    |  -3 table NUMBER_TABLE
    ----------------------------------
    */
        if(lua_isnumber(L,-2))
            cout<<"key:"<<lua_tonumber(L,-2)<<'\t';
        else if(lua_isstring(L,-2))
            cout<<"key:"<<lua_tostring(L,-2)<<'\t';
        if(lua_isnumber(L,-1))
            cout<<"value:"<<lua_tonumber(L,-1)<<endl;
        else if(lua_isstring(L,-1))
            cout<<"value:"<<lua_tostring(L,-1)<<endl;

    /*此時lua棧狀態
    ----------------------------------
    |  -1 value
    |  -2 key
    |  -3 table NUMBER_TABLE
    ----------------------------------
    */
        lua_pop(L,1);
    /*此時lua棧狀態
    ----------------------------------
    |  -1 key
    |  -2 table NUMBER_TABLE
    ----------------------------------
    */
    }
    lua_pop(L,1);

    /*此時lua棧狀態
    ----------------------------------
    |  -1 table NUMBER_TABLE
    ----------------------------------
    */
    lua_close(L);
    system("pause");
    return 0;
}

以上代碼的輸出為

key:a   value:this is a
key:c   value:this is c
key:b   value:this is b
請按任意鍵繼續. . .