Question

我要说的是，我对 Python 没有任何经验。我正在尝试为私人 Discord 服务器制作一个机器人，该服务器在键入“$gimme”后从 ftp 服务器（根目录）发布随机图像（.jpg）。 #文件名是随机的乱码

我已经搜索了几个小时来寻找解决方案，但我总是遇到一些问题。我无法弄清楚 ftp 与 discord 的语法，因为我对 Python 的了解几乎不存在，无论我搜索多少答案，我都无法弄清楚。

这真的是我最后的选择，我无处可寻。我希望有比我多一点知识的人可以帮助我。

谢谢

#include <iostream>
#include <map>
#include <variant>
#include <vector>
#include <string>

int main(){
    typedef std::map<std::string, std::variant<int, double, float, std::string>> Dict;

    std::vector<Dict> params = {
        {
            {"label", "Labs"},
            {"dir", "/media/sf_Data/"},
            {"num_frames", 4},
            {"scale_factor", 1.0},
        }, // Dict 0
        {
            {"label", "Airplanes"},
            {"dir", "/media/m_result/"},
            {"num_frames", 5},
            {"scale_factor", 0.5},
        } // Dict 1
    };

    int idx = 0;
    std::string label   = std::get<std::string>(params[idx]["label"]);
    std::string folder  = std::get<std::string>(params[idx]["dir"]);
    int num_frames      = std::get<int>(params[idx]["num_frames"]);
    double scf          = std::get<double>(params[idx]["scale_factor"]);
    
    std::cout << label << std::endl;
    std::cout << folder << std::endl;
    std::cout << num_frames << std::endl;
    std::cout << scf << std::endl;

    return 0;
}

Answer 1

使用回调方法编辑

我知道python和FTP不是discord，但是通过查看文档，我发现了如何在discord中发送文件。我做了以下代码（未经测试）。我添加了一个从 FTP 服务器随机获取文件的函数，并在 on_message 函数中调用这个函数

import os
import requests
import ftplib
from ftplib import FTP
import random
import discord

client = discord.Client()

ftp = FTP()
ftp.connect(os.getenv('BOP_IP'), 2021)
ftp.login(os.getenv('BOP_UN'), os.getenv('BOP_PW'))

#path='/'
def download_random_file()
  file_list = ftp.nlst()
  random_file_name = random.choice(file_list)
  #download the file
  with open(random_file_name, 'wb') as fp:
    ftp.retrbinary('RETR {0}'.format(random_file_name), fp.write) 
    
  return random_file_name

@client.event
async def on_ready():
  print('We have logged in as {0.user}'
  .format(client))

@client.event
async def on_message(message):
  if message.author == client.user:
    return
  if message.content.startswith('$gimme'):
    file_downloaded = download_random_file()
    await message.channel.send(file=discord.File(file_downloaded))
    os.unlink(file_downloaded) #Delete the downloaded file

client.run(os.getenv('TOKEN'))

优化：

确保文件已下载（使用 try catch 块）
确保下载的文件是图像（带有 MIMETYPE）

Answer 2

@axelinux

非常感谢您花时间帮助我。

在服务器上运行“$gimme”时出现以下错误

Ignoring exception in on_message
Traceback (most recent call last):
  File "/opt/virtualenvs/python3/lib/python3.8/site-packages/discord/client.py", line 343, in _run_event
    await coro(*args, **kwargs)
  File "main.py", line 31, in on_message
    file_downloaded = download_random_file()
  File "main.py", line 17, in download_random_file
    ftp.retrbinary('RETR {0}'.format(random_file_name)) #download the file
TypeError: retrbinary() missing 1 required positional argument: 'callback'

Answer 3

@axelinux

再次感谢。

您发送给我的修改后的代码在不和谐中输入“$gimme”后返回以下内容：

Ignoring exception in on_message
Traceback (most recent call last):
  File "/opt/virtualenvs/python3/lib/python3.8/site-packages/discord/client.py", line 343, in _run_event
    await coro(*args, **kwargs)
  File "main.py", line 34, in on_message
    file_downloaded = download_random_file()
  File "main.py", line 20, in download_random_file
    ftp.retrbinary('RETR {0}'.format(random_file_name), fp.write)
  File "/usr/lib/python3.8/ftplib.py", line 425, in retrbinary
    with self.transfercmd(cmd, rest) as conn:
  File "/usr/lib/python3.8/ftplib.py", line 382, in transfercmd
    return self.ntransfercmd(cmd, rest)[0]
  File "/usr/lib/python3.8/ftplib.py", line 348, in ntransfercmd
    resp = self.sendcmd(cmd)
  File "/usr/lib/python3.8/ftplib.py", line 275, in sendcmd
    return self.getresp()
  File "/usr/lib/python3.8/ftplib.py", line 248, in getresp
    raise error_perm(resp)
ftplib.error_perm: 550 File not found

我已经进行了一些搜索，我想我现在可以使用了：

def download_random_repo():
 ftp.cwd('/repo')
 file_list = ftp.nlst()
 random_file_name = random.choice(file_list)
 ftp.retrbinary('RETR {0}'.format(random_file_name), open(random_file_name, 'wb').write) #download the file
 return random_file_name

我所要做的就是将行更改为：ftp.retrbinary('RETR {0}'.format(random_file_name), open(random_file_name, 'wb').write)

非常感谢您的帮助。没有你就不能工作:)

让 Discord BOT 从 ftp 服务器 (Filezilla) 获取随机图像

3 个答案: