8000 Please destroy the QApplication singleton before creating a new QApplication instance. · Issue #1363 · tpaviot/pythonocc-core · GitHub
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Please destroy the QApplication singleton before creating a new QApplication instance. #1363

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LZHLZHOOO opened this issue Aug 18, 2024 · 2 comments
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Please destroy the QApplication singleton before creating a new QApplication instance. #1363

LZHLZHOOO opened this issue Aug 18, 2024 · 2 comments
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@LZHLZHOOO
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4b96f0dc14cb857437a767d6ca03e5d I want to upload a 3D model in STP format, but I'm encountering this error. Does anyone know what might be causing this issue? Please help.
@jnwalther
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jnwalther commented Oct 31, 2024 •
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I'm not 100% sure if this is the same issue, but I got the same error message when trying to open a display window for a second time in a single Python session. It seems to be related to Pyside6. Other projects seem to have similar issues.

The solution given in that issue seems to do the trick for me, i.e. go to https://github.com/tpaviot/pythonocc-core/blob/master/src/Display/SimpleGui.py and do

-  app = QtWidgets.QApplication(sys.argv)
+  app = QtWidgets.QApplication.instance() or QtWidgets.QApplication(sys.argv)

in line 230.

I haven't tested it completely, so I can't say if this change breaks anything for the other Qt versions.

@jnwalther jnwalther mentioned this issue Nov 7, 2024
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tpaviot commented Nov 15, 2024

Fixed by #1381

@tpaviot tpaviot closed this as completed Nov 15, 2024
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