Why can't I upload a photo to VKontakte?

Question

Python

There is such a code. It works, it can upload images to the server asynchronously, but I don't want to create unnecessary files, so I use BytesIO

import ...

image_url = '...'
vk_session = vk_api.VkApi(token=TOKEN)
api = vk_session.get_api()

upload_url = api.photos.getMessagesUploadServer()['upload_url']

with open('/tmp/photo.jpg', 'wb') as f:
    f.write(httpx.get(image_url).content)
files = {'photo': open('/tmp/photo.jpg', 'rb')}

async def fetch(url, file):
    async with httpx.AsyncClient() as client:
        s = await client.post(url, files=file)
        return s.json()


async def main():
    responses = await asyncio.ensure_future(fetch(upload_url, files))
    print(responses)

if __name__ == '__main__':
    asyncio.run(main())

But the code doesn't work with BytesIO, the 'photo' field is empty

import ...
image_url = '...'
vk_session = vk_api.VkApi(token=TOKEN)
api = vk_session.get_api()

upload_url = api.photos.getMessagesUploadServer()['upload_url']

files = {'photo': BytesIO(httpx.get(image_url).content)}

async def fetch(url, file):
    async with httpx.AsyncClient() as client:
        s = await client.post(url, files=file)
        return s.json()


async def main():
    responses = await asyncio.ensure_future(fetch(upload_url, files))
    print(responses)


if __name__ == '__main__':
    asyncio.run(main())

The answer is not an error, but the 'photo' field is empty. Why is this happening? How to upload photos to VKontakte servers without creating temporary files?

Answer 1

Isn't it easier to make a file, upload it and delete it right away?

Answer 2

You can upload photos like this, using the VkUpload method:

from vk_api import VkUpload

upload = VkUpload(vk_session)
send = upload.photo_messages(photos='название фотографии')
attach = "photo{}_{}".format(send[0]["owner_id"], send[0]["id"])

In messages.send in attachments you pass attach.