This application failed to start because no Qt platform plugin could be initialized.

[huskier]

After compiled the PythonQt, we try to run the example program PyGuiExample.exe in the lib directory, and we've gotten the following error. What's wrong with our program? Thanks in advance.

[mrbean-bremen]

This looks like your Qt installation is not found, or the wrong one is found. Have you checked that the plugins/platforms directory exists in the path of the Qt binaries, and that the Qt binaries are in the PATH?

[huskier]

@mrbean-bremen Thank you.
After added the user environment variable QT_QPA_PLATFORM_PLUGIN_PATH (value: C:\Application\Qt\5.15.2\msvc2019_64\plugins\platforms), the issue is fixed.

[mrbean-bremen]

Ah, good to know. I'm converting this into a discussion issue, as it may help others.