如何在Lua与C/C++之间实现table数据的交换

local tTest =
{
gdp = ,
info = "this is test about exchange table data!",
task = {, , , },
};

local tRet = TestTable(tTest);

int LuaTestTable(lua_State* L)
{
printf("stack size = %d\n", lua_gettop(L)); //打印栈中元素的个数 lua_pushstring(L, "gdp"); //将gdp字符串压入栈顶
//根据栈顶的key获取table中的value，将key（这里的“gdp”）移除，再将value压入栈顶
lua_gettable(L, );
printf("%s\n", lua_tostring(L, -)); //取栈顶元素（注意这里的整型值都是string类型）
lua_pop(L, ); //取完之后清理栈顶
printf("stack size = %d\n", lua_gettop(L)); //打印栈中元素的个数 lua_pushstring(L, "info"); //同上
lua_gettable(L, );
printf("%s\n", lua_tostring(L, -));
lua_pop(L, );
printf("stack size = %d\n", lua_gettop(L)); lua_pushstring(L, "task"); //这里的value值是一个table哦，没关系栈操作都是一样的
lua_gettable(L, );
for (int i = ; i < ; ++i)
{
lua_pushnumber(L, i+);
lua_gettable(L, -);
printf("%s\n", lua_tostring(L, -));
lua_pop(L, );
}
lua_pop(L, );
printf("stack size = %d\n", lua_gettop(L)); //到这里tTest表依然在栈底，但不影响后面的操作。 //------华丽的分割线------------//
//到这里table数据的解析就结束了，以下内容是c API给lua返回table数据 lua_newtable(L);//要给lua脚本返回一个table类型，先要new一个，压入栈顶
lua_pushnumber(L, ); //将key先压入栈
lua_pushstring(L, "table2lua"); //再将value压入栈
lua_settable(L, -);//settable将操作-2，-1编号的键值对，设置到table中，并把key-value从栈中移除 lua_pushstring(L, "key"); //同上
lua_newtable(L); //这里有个子table
lua_pushstring(L, "capi");
//这里的value类型使用lua_CFunction类型，可用做c API调用，函数实现请参看附录1
lua_pushcfunction(L, LuaSayHello);
lua_settable(L, -);
lua_pushnumber(L, );
lua_pushnumber(L, );
lua_settable(L, -);
lua_settable(L, -); //这个从这里“lua_pushstring(L, "key"); //同上”开始匹配的
printf("stack size = %d\n", lua_gettop(L));
return ; //返回栈顶1个元素
}

--file: test.lua
local tTest = {
gdp = ,
info = "this is test about exchange table data!",
task = {, , , },
};
local tRet = TestTable(tTest);
printTable(tRet); //实现请参看附录2
tRet.key.capi(); //实现请参看附录1

printTable(tRet);

tRet.key.capi();

stack size = //以下是LuaTestTable的输出 stack size =
this is test about exchange table data!
stack size = stack size =
stack size = //以下是printTable的输出
{
[] = table2lua
[key] =
{
[] =
[capi] = function: 0x409795
}
}
Lua call c/c++:SayHello() //这里是 [capi] = function: 0x409795被调用的输出
Hello Everyone!

//注册到lua虚拟机中的c API函数
int LuaSayHello(lua_State* L)
{
printf("Lua call c/c++:SayHello()\n");
printf("Hello Everyone!\n");
return ;
}

//脚本函数实现打印一个table
function printTable(t, n)
if "table" ~= type(t) then
return ;
end
n = n or ;
local str_space = "";
for i = , n do
str_space = str_space.." ";
end
print(str_space.."{");
for k, v in pairs(t) do
local str_k_v = str_space.." ["..tostring(k).."] = ";
if "table" == type(v) then
print(str_k_v);
printTable(v, n + );
else
str_k_v = str_k_v..tostring(v);
print(str_k_v);
end
end
print(str_space.."}");
end