PySide2: TypeError: 'bytes' object cannot be interpreted as an integer

Question

I have this PySide2 code which works on Linux with Python 2.7

from PySide2.QtCore import QBuffer, QByteArray

...

image = self.clipboard.image()
ba = QByteArray()
buffer = QBuffer(ba)
buffer.open(QIODevice.WriteOnly)
image.save(buffer, "PNG")
return bytes(buffer.data())

But on windows with Python 3.6 it fails here:

  File "C:\....foo.py", line 93, in image_to_png
    return bytes(buffer.data())

Exception:

TypeError: 'bytes' object cannot be interpreted as an integer

What is the most simple way to get the PNG as bytes?

I would like to avoid to create a temporary file, since it is not needed for this context.

(I use PySide2, but I could switch to a different python-QT binding if you think it makes more sense. Please leave a comment if you think so)

Are you just converting old code to run on Python 3, or does it need to run on both 2.7 and 3.6? — PM 2Ring
– PM 2Ring, Commented Sep 12, 2018 at 9:46
@PM2Ring Up to now the same code base works in 2.7 and 3.6. It would be nice, if this could stay this way (at least for some months). — guettli
– guettli, Commented Sep 12, 2018 at 10:15

mportes · Accepted Answer · 2018-11-02 23:22:06Z

2

Looks like QBuffer.data() return type is QByteArray (which probably cannot be handled by the bytes() constructor), however QByteArray.data() return type is bytes. So, I think you should try return buffer.data().data() instead of return bytes(buffer.data()).

answered Nov 2, 2018 at 23:22

mportes

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1 Comment

mportes Over a year ago

I think the online documentation is incorrect in this case, since it indicates str as the return type of QByteArray.data(): link

guettli · Accepted Answer · 2018-09-12 10:47:21Z

0

This is a work-around.

def image_to_png(image):
    temp_png = tempfile.mktemp('.png')
    image.save(temp_png)
    with io.open(temp_png, 'rb') as fd:
        content = fd.read()
    os.unlink(temp_png)
    return content

If possible, I would like to avoid the temporary file. Other solutions are welcome.

edited Sep 12, 2018 at 10:47

answered Sep 12, 2018 at 10:31

guettli

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