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平台：（Lua 和 LuaSocket 移植的地方）一个使用 ARM 7 开发板的嵌入式系统，运行带有 TCP/IP 堆栈的第 3 方 RTOS。

什么有效：

  • 使用 Lua 标准库，例如“io”调用、打印、断言等
  • 使用 udp = assert(socket.udp) 方法发送 UDP 数据包，assert(udp:send(something))

问题：执行示例 smtp lua 脚本时：

local smtp = require("socket.smtp")
from = "myEmail"
rcpt = {"<someOne's Email>"}
mesgt = { heasers = {someHeader}, body = "Hello World" } 
r, e = smtp.send {
    from = from,
    rcpt = rcpt, 
    source = smtp.message(mesgt),
    server = "someServer",
    port = 25,
}

-- an error returns after execution: 
-- lua\socket\smtp.lua:115: attempt to call field 'try' (a nil value)

-- Corresponding code in smtp.lua around line 115:

function open(server, port, create)
    local tp = socket.try(tp.connect(server or SERVER, port or PORT,
        TIMEOUT, create))
    local s = base.setmetatable({tp = tp}, metat)
    -- make sure tp is closed if we get an exception
    s.try = socket.newtry(function()
        s:close()
    end)
    return s
end

// Where try = newtry() in socket.lua and the corresponding C code is the same
// from the one provided with the library for UNIX:
static int global_newtry(lua_State *L) {
    lua_settop(L, 1);
    if (lua_isnil(L, 1)) lua_pushcfunction(L, do_nothing);
    lua_pushcclosure(L, finalize, 1);
    return 1;
}
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1 回答 1

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好吧，既然错误说“try is nil”，那么我最好的猜测是C lib没有正确或不完全链接到你的Lua。这可能是安装错误、缺少库或类似原因的结果。

于 2012-04-11T17:59:04.607 回答