PySide2 cannot display image

SGaist

Hi and welcome to devnet,

Unless cat.jpg is in the same folder as where you start your python script, that won't work.

weida_wang

@SGaist Thanks for your greeting ! Yes, i put the py script and cat.jpg in the same folder, even though i pass the full path of cat.jpg, the window is still empty, please see the sreenshot (i.postimg.cc/ZqGW6xpz/image.png)

JonB

@weida_wang
FWIW: Try changing that guy's code so that you keep the original QMainWindow::centralWidget(), add a Q[HV]BoxLayout onto it, and add your QLabel onto that; and maybe put in some explicit sizes while you sort it out. It's just possible you have a layout issue. Also try label.setScaledContents(True). I'm not sure why it works from PyQt but not from PySide2.

weida_wang

@JonB emm， it seems not the layout issue, because print(pixmap.isNull()) outputs True , looks like something is wrong here

JonB

@weida_wang
Then it really does sound like it's having trouble finding the file. And I still don't get why that differ from PyQt, unless you are running the PySide from a different folder.

SGaist

Did you check that the file is in fact a valid jpeg image ?

JonB

@SGaist
The OP claims on stackoverflow (better to have copied the post here than just reference it):

If the imported package is PyQt5, it can work ! But if i replace PyQt5 with PySide2, it can't work again

:)

Which is why I want to verify he is running both from the same directory....

weida_wang

@JonB @SGaist Hi, Guys, i find the correct solution here : https://stackoverflow.com/questions/24346038/pyside-qpixmap-not-working.
Thanks for everyone's discussion !

JonB

@weida_wang
These links are from several years ago, for old PySide rather than new PySide2. I am surprised it is still the case: is this a bug, has it been reported on the Qt bugs site to the PySide2 people?

SGaist

Do you need to do that for a completely new installation of PySide2 ?