QImage from file content

Question

I have a table in my DB which contains information about images (like width, height, content-type, file-type and file content). In column file_content stored entire image (not pixel data or something else - entire file readed and stored as binary data). Now I want to create QImage (or QPixmap) from this record in my application on Python+PySide. How can I do it?

I tried loadFromData, but it is expects raw pixel data, not file with header like in my case.

Actually, I have no idea hot to solve it.

UPD: My code sample which does not works:

    with open('Koala.jpg', 'r') as f:
        content = f.read()

    self.image = QtGui.QImage()

    print self.image.loadFromData(content)

Result:

False
Corrupt JPEG data: 1 extraneous bytes before marker 0xd9
JPEG datastream contains no image

loadFromData should work, it doesn't expect raw pixel data. Are you giving it the right image format? Have you confirmed that the data you're passing in does actually represent a valid image? — Dan Milburn, Jul 25 '13 at 10:16
@DanMilburn I updated question with source code which does not works for me. No matter what kind of image - jpg or png I trying to load it always fails. — Alex G.P., Jul 25 '13 at 13:17

score 1 · Accepted Answer · answered Jul 25 '13 at 13:27

1

Such a silly mistake! Just replaced with open('Koala.jpg', 'r') as f: with with open('Koala.jpg', 'rb') as f: and loadFromData loaded my images.

Never forget to open image files as binary!

answered Jul 25 '13 at 13:27

Alex G.P.

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score 0 · Answer 2 · answered Jul 25 '13 at 08:33

0

There is QImage::loadFromData for that.

See the docs.

answered Jul 25 '13 at 08:33

Pavel Strakhov

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Thank you for reference to C++ Qt, but for Python port Pyside existing only one method `loadFromData` (http://srinikom.github.io/pyside-docs/PySide/QtGui/QImage.html#PySide.QtGui.PySide.QtGui.QImage.loadFromData) which returns `bool`. Anyway, it is not working accordingly to my updated waustion - I've added code sample. – Alex G.P. Jul 25 '13 at 13:19

QImage from file content

2 Answers2

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