c - Lua C API : handling large numbers

Question

我在代码中处理皮秒(数字 > 10^12)。
C代码给Lua传数据(atime和eventid都是size_t类型)

lua_getglobal ( luactx, "timer_callback" );
lua_pushunsigned ( luactx, atime );
lua_pushunsigned ( luactx, eventid );
lua_pcall ( luactx, 2, 0, 0 );

Lua函数

function timer_callback(time, eventid)  
  if eventid == TX_CLOCK then
  out_log(tostring(time)) --result is random garbage
  set_callback(time + 1000000000000, TX_CLOCK)
  return
  end  
end

我尝试使用 lua_pushnumber，但结果在 lua 中我得到了负数。

Answer 1

从 5.3 开始，Lua 支持 lua_Integer，默认为 64 位。来自reference manual :

lua_Integer

typedef ... lua_Integer;

The type of integers in Lua.

By default this type is long long (usually a 64-bit two-complement integer), but that can be changed to long or int, usually a 32-bit two-complement integer. (See LUA_INT in luaconf.h.) Lua also defines the constants LUA_MININTEGER and LUA_MAXINTEGER, with the minimum and the maximum values that fit in this type.

Lua 5.2 lua 可以通过编辑 luaconf.h 很容易地强制使用不同的数字类型。数字类型定义为 LUA_NUMBER。

对于 lua 5.1，你可以安装 lnum补丁，这将更改整数类型。