Tengu Tengu - 3 months ago 126
Linux Question

Python ValueError: embedded null byte when reading png file from bash pipe

from PIL import Image
from subprocess import Popen, PIPE

scr = Image.open(Popen.communicate(Popen(['import','-w','0x02a00001','png:-'], stdout=PIPE))[0])


File "/usr/lib/python3/dist-packages/PIL/Image.py", line 2258, in open
fp = builtins.open(filename, "rb")
ValueError: embedded null byte

Answer

Try first to load raw data into a BytesIO container:

from io import BytesIO
from PIL import Image
from subprocess import Popen, PIPE

data = Popen.communicate(Popen(['import','-w','0x02a00001','png:-'], stdout=PIPE))[0]
scr = Image.open(BytesIO(data))