Discord Bots：检测另一个命令中的消息

Question

在我的discord bot（python）上，我试图检测或更确切地说是检查命令中发送的消息：如果有人键入命令$start，则该命令应在while循环中检查$start命令之后发送的消息。如果发送的消息为“加入”，则应将发送消息的用户添加到列表中。我试图通过on_message（）函数检测消息并将其保存在变量中，但它似乎不起作用，我认为我的代码没有多大意义，但我不知道如何正确实现它

import discord
from discord.ext import commands
    
client = commands.Bot(command_prefix = "$")

@client.event
async def on_ready():
    print("started")

sentMsg = ""
users = []

@client.event
async def on_message(msg):
    if msg.author == client.user:
        return
    else:
        sentMsg = msg.content
        print(sentMsg)

@client.command()
async def start(ctx):
    print(sentMsg)
    await ctx.send("starting ...")
    users.append(ctx.author)
    while True:
        if sentMsg == "join":
            ctx.send("Joined!")
            sentMsg = ""

client.run(*token*)

我把sentMsg varible放在VS代码的Watch部分，它总是说“不可用”，尽管它打印了正确的值。在on_message（）中将鼠标悬停在其上方时，会显示：“sentMsg”未被访问。 有人能改进我的代码吗？或者有人有更好的想法来实现这一点吗

我非常感谢任何人的帮助

Answer 1

您可以让bot使用client.wait_for检测消息，而不是使用on_消息事件

例如：

@client.command()
async def start(ctx):
    await ctx.send("starting ...")
        try:
            message = await client.wait_for('message', timeout=10, check=lambda m: m.author == ctx.author and m.channel == ctx.channel and ctx.content == "join") # You can set the timeout to 'None' 
            # if you don't want it to timeout (then you can also remove the 'asyncio.TimeoutError' except case 
            # (remember you have to have at least 1 except after a 'try'))

            # if you want the bot to cancel this if the message content is not 'join',
            # take the last statement from the check and put it here with an if
            
            # what you want to do after "join" message

        except asyncio.TimeoutError:
            await ctx.send('You failed to respond in time!')
            return