voice_client 和 url 突然在 discord.py 机器人中不起作用

Question

我一直在编写一个不和谐的音乐机器人，我的简单版本没有任何错误！现在我想添加队列功能，我设计了它以便 replit.com 可以处理它。但现在我有错误说：

Ignoring exception in command play:
Traceback (most recent call last):
  File "/opt/virtualenvs/python3/lib/python3.8/site-packages/discord/ext/commands/core.py", line 85, in wrapped
    ret = await coro(*args, **kwargs)
  File "main.py", line 69, in _play
    vc = ctx.voice_client
AttributeError: 'str' object has no attribute 'voice_client'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/opt/virtualenvs/python3/lib/python3.8/site-packages/discord/ext/commands/bot.py", line 939, in invoke
    await ctx.command.invoke(ctx)
  File "/opt/virtualenvs/python3/lib/python3.8/site-packages/discord/ext/commands/core.py", line 863, in invoke
    await injected(*ctx.args, **ctx.kwargs)
  File "/opt/virtualenvs/python3/lib/python3.8/site-packages/discord/ext/commands/core.py", line 94, in wrapped
    raise CommandInvokeError(exc) from exc
discord.ext.commands.errors.CommandInvokeError: Command raised an exception: AttributeError: 'str' object has no attribute 'voice_client'

一般来说，像“is_paused”或“is_playing”这样的不和谐播放变量都不再起作用（得到相同的AttributeError。）！

这是我的代码：

queue_urls = []

class Music(commands.Cog):
  async def check_for_play(self, ctx):
    if len(queue_urls) > 0: #if there still are more items in the queue...
      await ctx.invoke(self.real_play) #...run the player again

  async def real_play(self, ctx): #the player plays the song...
    voice = discord.utils.get(bot.voice_clients, guild=ctx.guild)
    url = queue_urls[0]
    queue_urls.pop(0)
    with youtube_dl.YoutubeDL(ytdlopts) as ydl:
      info = ydl.extract_info(url, download=False)
      URL_NEXT = info['formats'][0]['url']
    voice.play(discord.FFmpegPCMAudio(URL_NEXT, **ffmpegopts), after=lambda e: ctx.invoke(self.check_for_play)) #...and when the song is finished, should run the function check_for_play

  @bot.command(name='play', aliases=['sing', 'p'])
  async def _play(self, ctx): #the command...
    vc = ctx.voice_client
    if not vc.is_connected:
      channel = ctx.author.voice.channel
      await channel.connect()
    url = ctx.message.content
    url = ttourl(url)
    queue_urls.append(url) #...adds the item to the queue...
    voicec = ctx.voice_client
    if not voicec.is_playing: #...and starts the player if its not already playing
      await ctx.invoke(self.real_play)

Answer 1

您遇到此错误是因为您的 cog 不完整且部分错误：

• 您没有声明 __init__ 构造函数，如果您想访问 cog 中的 bot 变量，这是必需的：

class Music(commands.Cog):
    def __init__(self, bot):
        self.bot = bot

• 您需要将每个 bot 引用替换为 self.bot，如下所示：

voice = discord.utils.get(self.bot.voice_clients, guild=ctx.guild)

• 在 cog 内部，您需要将 @bot.command() 替换为 @commands.command()：

@commands.command(name='play', aliases=['sing', 'p'])
async def _play(self, ctx):

Answer 2

我知道你在这里设计了一个 cog，但是你拥有的命令装饰器对于运行一个 cog 是不正确的。装饰器从client.command() 更改为commands.command()。当您说这在您的简化版本中有效时，我假设您的意思是单文件程序。