問題描述

我正在嘗試為 Discord 機器人實現一個系統，該系統可以動態修改圖像并將它們發送給機器人用戶.為此，我決定使用 Pillow (PIL) 庫，因為它對我的目的來說看起來簡單明了.

I am trying to implement a system for a Discord bot that dynamically modifies images and sends them to the bot users. To do that, I decided to use the Pillow (PIL) library, since it seemed simple and straightforward for my purposes.

這是我的工作代碼示例.它加載一個示例圖像，作為測試修改，在其上繪制兩條對角線，并將圖像作為 Discord 消息輸出:

Here is an example of my working code. It loads an example image, as a test modification, draws two diagonal lines on it, and outputs the image as a Discord message:

# Open source image
img = Image.open('example_image.png')

# Modify image
draw = ImageDraw.Draw(img)
draw.line((0, 0) + img.size, fill=128)
draw.line((0, img.size[1], img.size[0], 0), fill=128)

# Save to disk and create discord file object
img.save('tmp.png', format='PNG')
file = discord.File(open('tmp.png', 'rb'))

# Send picture as message
await message.channel.send("Test", file=file)

這會導致我的機器人發出以下消息:

This results in the following message from my bot:

這行得通；但是，我想省略將圖像保存到硬盤驅動器并再次加載它的步驟，因為這似乎相當低效且不必要.經過一番谷歌搜索后，我遇到了以下解決方案；但是，它似乎不起作用:

This works; however, I would like to omit the step of saving the image to the hard drive and loading it again, since that seems rather inefficient and unnecessary. After some googling I came across following solution; however, it doesn't seem to work:

# Save to disk and create discord file object
# img.save('tmp.png', format='PNG')
# file = discord.File(open('tmp.png', 'rb'))

# Save to memory and create discord file object
arr = io.BytesIO()
img.save(arr, format='PNG')
file = discord.File(open(arr.getvalue(), 'rb'))

這會導致以下錯誤消息:

This results in the following error message:

Traceback (most recent call last):
    File "C:Users<username>AppDataLocalProgramsPythonPython38-32libsite-packagesdiscordclient.py", line 270, in _run_event
        await coro(*args, **kwargs)
    File "example_bot.py", line 48, in on_message
        file = discord.File(open(arr.getvalue(), 'rb'))
UnicodeDecodeError: 'utf-8' codec can't decode byte 0x89 in position 0: invalid start byte

推薦答案

discord.File 支持傳遞 io.BufferedIOBase 作為 fp 參數.
io.BytesIO 繼承自 <代碼>io.BufferedIOBase.
這意味著您可以直接將 io.BytesIO 的實例作為 fp 來初始化 discord.File，例如:

discord.File supports passing io.BufferedIOBase as the fp parameter.
io.BytesIO inherits from io.BufferedIOBase.
This means that you can directly pass the instance of io.BytesIO as fp to initialize discord.File, e.g.:

arr = io.BytesIO()
img.save(arr, format='PNG')
arr.seek(0)
file = discord.File(arr)

另一個例子可以在 如何上傳圖片?discord.py 文檔中的常見問題解答部分.

這篇關于從內存中發送圖像的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！