Bytes to bufferedreader python

Преобразовать байты в объект BufferedReader в Python?

Название этого вопроса такое же, как у этого, и я проголосовал за повторную постановку вопроса.

Я хочу преобразовать байтовый объект в объект BufferedReader, и вот мои попытки (после обращения ко многим статьям):

import numpy as np from PIL import Image as PILImage from io import BytesIO img_np = np.asarray([[[16, 16, 16], [2, 2, 2], [0, 0, 0], [6, 6, 6], [8, 8, 8], [0, 0, 0], [21, 21, 21], [3, 3, 3], [0, 0, 0], [62, 62, 62]], [[0, 0, 0], [71, 71, 71], [142, 142, 142], [107, 107, 107], [99, 99, 99], [101, 101, 101], [4, 4, 4], [86, 86, 86], [99, 99, 99], [146, 146, 146]], [[162, 162, 162], [203, 203, 203], [192, 192, 192], [228, 228, 228], [191, 191, 191], [178, 178, 178], [222, 222, 222], [200, 200, 200], [198, 198, 198], [182, 182, 182]], [[117, 117, 117], [178, 178, 178], [199, 199, 199], [214, 214, 214], [222, 222, 222], [208, 208, 208], [255, 255, 255], [251, 251, 251], [219, 219, 219], [255, 255, 255]], [[0, 0, 0], [0, 0, 0], [80, 80, 80], [169, 169, 169], [193, 193, 193], [238, 238, 238], [239, 239, 239], [243, 243, 243], [254, 254, 254], [230, 230, 230]], [[20, 20, 20], [20, 20, 20], [9, 9, 9], [1, 1, 1], [130, 130, 130], [194, 194, 194], [216, 216, 216], [255, 255, 255], [252, 252, 252], [255, 255, 255]], [[9, 9, 9], [0, 0, 0], [0, 0, 0], [0, 0, 0], [3, 3, 3], [44, 44, 44], [191, 191, 191], [217, 217, 217], [248, 248, 248], [225, 225, 225]], [[0, 0, 0], [11, 11, 11], [3, 3, 3], [11, 11, 11], [6, 6, 6], [15, 15, 15], [0, 0, 0], [153, 153, 153], [255, 255, 255], [253, 253, 253]], [[0, 0, 0], [5, 5, 5], [1, 1, 1], [4, 4, 4], [8, 8, 8], [4, 4, 4], [3, 3, 3], [0, 0, 0], [159, 159, 159], [241, 241, 241]], [[10, 10, 10], [9, 9, 9], [6, 6, 6], [2, 2, 2], [0, 0, 0], [0, 0, 0], [3, 3, 3], [20, 20, 20], [0, 0, 0], [185, 185, 185]]]) im = PILImage.fromarray(img_np.astype(np.uint8)) # im.save('./temp.jpeg', "JPEG") # f = open('./temp.jpeg', 'rb') # print(type(f)) # b_handle = io.BytesIO() im.save(b_handle, format="JPEG") # b = im.tobytes() print(type(b_handle)) b = b_handle.read() print(type(b)) print(b) im.save(b_handle, format="JPEG") b_br = io.BufferedReader(b_handle) print(type(b_br)) b = b_br.read() print(type(b)) print(b) 

Результат выглядит следующим образом:

Кажется, что файл вроде объектов пустой. Я знаю, что для b_handle я могу получить значение с помощью b_handle.getvalue() , но для буферизованного чтения он не работает как файловый объект.

Как я могу преобразовать байтовую строку в объект буферизованного чтения так же, как я открываю файл?

Источник

Convert Bytes into BufferedReader object in Python?

You are almost there. Once you save the image bytes into the buffer you need to seek (Change stream position) to byte offset 0 prior to the read call.

b_handle = io.BytesIO() im.save(b_handle, format="JPEG") b_handle.seek(0) b_handle.name = "temp.jpeg" b_br = io.BufferedReader(b_handle) b = b_br.read() 

>>> from io import BytesIO, BufferedReader >>> >>> b_handle = BytesIO() >>> b_handle.write(b"Hello World") 11 >>> b_handle.seek(0) # This is important. 0 >>> br = BufferedReader(b_handle) >>> br >>> br.read() b'Hello World' 

Abdul Niyas P M 13686

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Источник

Convert Bytes into BufferedReader object in Python?

The title of this question is the same as this one, and I have voted to reopoen the question.

I want to convert a byte object into a BufferedReader one, and here is my attempts(after referring to many articles):

import numpy as np from PIL import Image as PILImage from io import BytesIO img_np = np.asarray([[[16, 16, 16], [2, 2, 2], [0, 0, 0], [6, 6, 6], [8, 8, 8], [0, 0, 0], [21, 21, 21], [3, 3, 3], [0, 0, 0], [62, 62, 62]], [[0, 0, 0], [71, 71, 71], [142, 142, 142], [107, 107, 107], [99, 99, 99], [101, 101, 101], [4, 4, 4], [86, 86, 86], [99, 99, 99], [146, 146, 146]], [[162, 162, 162], [203, 203, 203], [192, 192, 192], [228, 228, 228], [191, 191, 191], [178, 178, 178], [222, 222, 222], [200, 200, 200], [198, 198, 198], [182, 182, 182]], [[117, 117, 117], [178, 178, 178], [199, 199, 199], [214, 214, 214], [222, 222, 222], [208, 208, 208], [255, 255, 255], [251, 251, 251], [219, 219, 219], [255, 255, 255]], [[0, 0, 0], [0, 0, 0], [80, 80, 80], [169, 169, 169], [193, 193, 193], [238, 238, 238], [239, 239, 239], [243, 243, 243], [254, 254, 254], [230, 230, 230]], [[20, 20, 20], [20, 20, 20], [9, 9, 9], [1, 1, 1], [130, 130, 130], [194, 194, 194], [216, 216, 216], [255, 255, 255], [252, 252, 252], [255, 255, 255]], [[9, 9, 9], [0, 0, 0], [0, 0, 0], [0, 0, 0], [3, 3, 3], [44, 44, 44], [191, 191, 191], [217, 217, 217], [248, 248, 248], [225, 225, 225]], [[0, 0, 0], [11, 11, 11], [3, 3, 3], [11, 11, 11], [6, 6, 6], [15, 15, 15], [0, 0, 0], [153, 153, 153], [255, 255, 255], [253, 253, 253]], [[0, 0, 0], [5, 5, 5], [1, 1, 1], [4, 4, 4], [8, 8, 8], [4, 4, 4], [3, 3, 3], [0, 0, 0], [159, 159, 159], [241, 241, 241]], [[10, 10, 10], [9, 9, 9], [6, 6, 6], [2, 2, 2], [0, 0, 0], [0, 0, 0], [3, 3, 3], [20, 20, 20], [0, 0, 0], [185, 185, 185]]]) im = PILImage.fromarray(img_np.astype(np.uint8)) # im.save('./temp.jpeg', "JPEG") # f = open('./temp.jpeg', 'rb') # print(type(f)) # b_handle = io.BytesIO() im.save(b_handle, format="JPEG") # b = im.tobytes() print(type(b_handle)) b = b_handle.read() print(type(b)) print(b) im.save(b_handle, format="JPEG") b_br = io.BufferedReader(b_handle) print(type(b_br)) b = b_br.read() print(type(b)) print(b) 

It seems that the file like objects are empty. I know that for the b_handle I can get the value by b_handle.getvalue() but for the bufferedreader it doesn’t work as a file object.

How can I convert a byte string into a bufferedreader object, the same as I open a file?

Answer

davy.ai

To convert a byte string into a BufferedReader object, you can use the io.BufferedReader(io.BytesIO(byte_string)) constructor. Here’s an example using the code from the question:

import numpy as np from PIL import Image as PILImage import io img_np = np.asarray([[[16, 16, 16], [2, 2, 2], [0, 0, 0], [6, 6, 6], [8, 8, 8], [0, 0, 0], [21, 21, 21], [3, 3, 3], [0, 0, 0], [62, 62, 62]], [[0, 0, 0], [71, 71, 71], [142, 142, 142], [107, 107, 107], [99, 99, 99], [101, 101, 101], [4, 4, 4], [86, 86, 86], [99, 99, 99], [146, 146, 146]], [[162, 162, 162], [203, 203, 203], [192, 192, 192], [228, 228, 228], [191, 191, 191], [178, 178, 178], [222, 222, 222], [200, 200, 200], [198, 198, 198], [182, 182, 182]], [[117, 117, 117], [178, 178, 178], [199, 199, 199], [214, 214, 214], [222, 222, 222], [208, 208, 208], [255, 255, 255], [251, 251, 251], [219, 219, 219], [255, 255, 255]], [[0, 0, 0], [0, 0, 0], [80, 80, 80], [169, 169, 169], [193, 193, 193], [238, 238, 238], [239, 239, 239], [243, 243, 243], [254, 254, 254], [230, 230, 230]], [[20, 20, 20], [20, 20, 20], [9, 9, 9], [1, 1, 1], [130, 130, 130], [194, 194, 194], [216, 216, 216], [255, 255, 255], [252, 252, 252], [255, 255, 255]], [[9, 9, 9], [0, 0, 0], [0, 0, 0], [0, 0, 0], [3, 3, 3], [44, 44, 44], [191, 191, 191], [217, 217, 217], [248, 248, 248], [225, 225, 225]], [[0, 0, 0], [11, 11, 11], [3, 3, 3], [11, 11, 11], [6, 6, 6], [15, 15, 15], [0, 0, 0], [153, 153, 153], [255, 255, 255], [253, 253, 253]], [[0, 0, 0], [5, 5, 5], [1, 1, 1], [4, 4, 4], [8, 8, 8], [4, 4, 4], [3, 3, 3], [0, 0, 0], [159, 159, 159], [241, 241, 241]], [[10, 10, 10], [9, 9, 9], [6, 6, 6], [2, 2, 2], [0, 0, 0], [0, 0, 0], [3, 3, 3], [20, 20, 20], [0, 0, 0], [185, 185, 185]]]) im = PILImage.fromarray(img_np.astype(np.uint8)) # Convert image to bytes and read into buffer b = io.BytesIO() im.save(b, format='JPEG') b.seek(0) buf = io.BufferedReader(b) # Read buffer contents data = buf.read() print(type(data)) #

In this example, we first save the image as a byte string using BytesIO , then read the byte string into a BufferedReader using io.BufferedReader(io.BytesIO(byte_string)) . Finally, we read the buffer’s contents using the read() method.

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