CODEWITHSUNDEEP
pythonpysidemaya
ColinKennedy
ColinKennedy

Reputation: 998

Getting unittest PySide and Maya on commandline to work

I have a Maya environment with a PySide window which gets generated on the fly with whatever is in that Maya scene. I'm trying to now take that to command-line and make unittests out of it.

I have everything working, minus one problem. Most PyQt/PySide unittest documentation state to create a QApplication like this:

app = QApplication(sys.argv)
win = SomeWindow()
sys.exit(app.exec_())

This doesn't work because there's already a QApplication instance, built from Maya. 

RuntimeError: A QApplication instance already exists.

Excluding these steps though yields this error and the tests fail:

QWidget: Cannot create a QWidget when no GUI is being used

I know that there's a QApplication instance in the scene, because this command yields a QApplication instance:

QApplication.instance()

So how do I associate the GUI that I want to create with that instance? You can't exec_() Maya's running QApplication so I'm not sure how to get my GUI to see the QApplication. _

Upvotes: 0

Views: 464

Answers (1)

ColinKennedy
ColinKennedy

Reputation: 998

Found the solution. The issue was that I wasn't holding a global reference to the same instance across all of my tests (multiple Maya files were being created/destroyed over and over).

So somewhere at the top of the file, you just write

APP = None

Then in each test, import another file that keeps a link to that QApplication instance as a singleton and set APP equal to it

Upvotes: 1

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