我正在制作一個(gè)簡單的Flask API來上傳圖像并執(zhí)行一些操作，然后將其作為二進(jìn)制存儲在數(shù)據(jù)庫中，然后我想使用 send_file()函數(shù)下載它，但是，當(dāng)我傳遞像字節(jié)這樣的圖像時(shí)，它會給我一個(gè)錯誤:return send_file(BytesIO.read(image.data), attachment_filename='f.jpg', as_attachment=True) TypeError: descriptor“read”需要“_io.BytesIO”對象，但收到“bytes”我的上傳圖像的代碼如下：@app.route('/upload', methods=['POST'])def upload(): images = request.files.getlist('uploadImages') n = 0 for image in images: fileName = image.filename.split('.')[0] fileFormat = image.filename.split('.')[1] imageRead = image.read() img = BytesIO(imageRead) with graph.as_default(): caption = generate_caption_from_file(img) newImage = imageDescription(name=fileName, format=fileFormat, description=caption, data=imageRead) db.session.add(newImage) db.session.commit() n = n + 1 return str(n) + ' Image has been saved successfully'我的下載圖像的代碼：@app.route('/download/<int:id>')def download(id): image = imageDescription.query.get_or_404(id) return send_file(BytesIO.read(image.data), attachment_filename='f.jpg', as_attachment=True)任何人都可以幫忙嗎？？？
1 回答
鴻蒙傳說
TA貢獻(xiàn)1865條經(jīng)驗(yàn) 獲得超7個(gè)贊
看來你很困惑io.BytesIO。讓我們看一些使用的示例BytesIO。
>>> from io import BytesIO
>>> inp_b = BytesIO(b'Hello World', )
>>> inp_b
<_io.BytesIO object at 0x7ff2a71ecb30>
>>> inp.read() # read the bytes stream for first time
b'Hello World'
>>> inp.read() # now it is positioned at the end so doesn't give anything.
b''
>>> inp.seek(0) # position it back to begin
>>> BytesIO.read(inp) # This is same as above and prints bytes stream
b'Hello World'
>>> inp.seek(0)
>>> inp.read(4) # Just read upto four bytes of stream.
>>> b'Hell'
read這應(yīng)該能讓您了解on 的工作原理BytesIO。我認(rèn)為你需要做的是這個(gè)。
return send_file(
BytesIO(image.data),
mimetype='image/jpg',
as_attachment=True,
attachment_filename='f.jpg'
)
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