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我在 Computercraft 上有一个名为 Twitch 的程序，它显示了我在 Twitch 上有多少浏览者和追随者。当我尝试运行它时，它给了我这个错误：

twitch:39: 尝试索引

? （一个空值）

代码是：

    -- Written By Bacon_Donut
-- http://twitch.tv/bacon_donut
-- API call updated by @darkgoldblade on twitter

-- View all my public pastebin codes at:
-- http://pastebin.com/u/bacon_donut

-- This is formatted to fit on a 1x3 wall of Advanced Monitors
-- with an Advanced Computer on the left side.
-- To get this to work you need to edit the streamid variable then run these four commands:

-- label set SomeKindOfNameHere
-- pastebin get 4nRg9CHU json
-- pastebin get vhn1z23v startup
-- startup

-- ChangeLog:
-- Feb 16, 2015 - @CoolAcid
-- Added automatic download of JSON parser
-- Fixed the offline streamer detection
-- Added last follower option

-- Twitch Name of the Streamer
streamid = "Bacon_Donut"


-- SleepTime is how often to grab new data. Set here to one minute.
-- Set it too fast and twitch will flag you for spam
-- and stop giving you data
SleepTime = 60

if not fs.exists('json') then
        write("JSON API not found - Downloading")
        shell.run("pastebin get 4nRg9CHU json")
end

os.loadAPI("json")
local m = peripheral.wrap("right")
m.setCursorPos(1,1)

function getFollowers()

        str = http.get("https://api.twitch.tv/kraken/channels/" .. streamid .. "/follows?limit=1").readAll()
        obj = json.decode(str)
        follows = json.encodePretty(obj._total)

        m.setCursorPos(1,3)    
        m.write("Twitch Followers: ")
        m.write(follows)

        return follows
end

function getFollower()

        str = http.get("https://api.twitch.tv/kraken/channels/" .. streamid .. "/follows?limit=1").readAll()
        obj = json.decode(str)
        follower = json.encodePretty(obj.follows[1].user.name)

        m.setCursorPos(1,5)    
        m.write("Follower: ")
        m.write(follower)

        return follows
end

function getViewerCount()
        lstr = http.get("https://api.twitch.tv/kraken/streams/" .. streamid).readAll()
        lobj = json.decode(lstr)
        m.setCursorPos(1,1)


        if lobj.stream == nil then
                m.write(streamid)
                m.setCursorPos(1,4)
                m.write("Live Viewers: Offline")
        else
                live = json.encodePretty(lobj.stream.viewers)
                m.setBackgroundColor(colors.yellow)
                m.clear()
                m.write(streamid)
                m.setCursorPos(1,4)
                m.write("Live Viewers: ")
                m.write(live)          
        end

        return live
end

while true do
        m.setCursorPos(1,1)
        m.setBackgroundColor(colors.white)
        m.setTextColor(colors.blue)
        m.setTextScale(1)
        m.clear()

        m.write(streamid)
        m.setCursorPos(1,4)

        local status, live = pcall(function () getViewerCount() end)

        if status then
                -- do nothing
        else
                m.write("Live Viewers: Loading...")
        end

        local status, followsCount = pcall(function () getFollowers() end)

        m.setCursorPos(1,3)    

        if status then         
                -- do nothing
        else           
                m.write("Twitch Follows: Loading...")
        end

        m.setCursorPos(1,5)    

        local status, live = pcall(function () getFollower() end)

        if status then
                -- do nothing
        else
                m.write("Follower: Loading...")
        end



        sleep(SleepTime)
end
4

2 回答 2

2

李毅的假设是错误的。

考虑到您的错误是具体的，尝试索引？（一个 nil 值），那么这意味着 m 是 nil。换句话说，您需要在计算机右侧放置一个外围设备（在这种情况下，我假设是一个显示器）。

从代码：

-- This is formatted to fit on a 1x3 wall of Advanced Monitors
-- with an Advanced Computer on the left side.

所以你需要显示器，在右边。

也许您应该阅读其他人的代码提供的说明，而不是想知道它为什么不起作用。

于 2015-04-08T18:26:49.670 回答
0

您包装的外围设备实际上没有能力setCursorPos()

边注：

多行注释通常是这样完成的：

--[[
Stuff here is a comment
]]--
于 2015-03-23T10:50:27.370 回答