问题描述
如果用户键入 /foo 并且该命令不存在，我如何发送消息说该命令不存在"?
If user types /foo and that command does not exist, how do I send the message saying "This command does not exist"?
这可能很简单，但我有点困惑.
This is maybe pretty simple but I'm bit confused.
如果您需要更多信息，请发表评论.
If you need more info please comment.
谢谢！
推荐答案
你可以定义一个 on_command_error 事件(请注意，与记录的重写分支相比，异步分支上的参数顺序相反)如果出现 CommandError ，将被调用.
You can define an on_command_error event (Note that the order of arguments is reversed on the async branch, compared to the documented rewrite branch) that will be called if there if a CommandError is raised.
然后您可以签入 错误处理程序 如果错误是 CommandNotFound 错误并相应处理:
You can then check in that error handler if the error is a CommandNotFound error and handle it accordingly:
@bot.event
async def on_command_error(error, ctx):
if isinstance(error, commands.CommandNotFound):
await bot.send_message(ctx.message.channel, "No such command")
else:
raise error
这假设您正在使用 discord.ext.commands 扩展来编写命令(您应该这样做).
This assumes you are using the discord.ext.commands extension to write your commands (which you should).
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