René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Application crash on macOS after closing the Py-QT5 window.","articleBody":"Hello.\r\nThere is a big problem with macOS Ventura 13.1.\r\nI've made the simplest app for macOS 64-bit - one Form, one Button. It executes a very simple python script. \r\n\r\nEverything works fine, but after closing the chart window, the application crashes with a message in a PAServer:\r\n`objc_disposeClassPair: class 'FMXWindow' still has subclasses, including 'NSKVONotifying_FMXWindow’!`\r\n\r\nIn larger projects, the effect is stranger. What can be done to solve this problem?\r\n\r\nP.S. It is also interesting that after running the script, the application icon changes to the Matplotlib icon.\r\n\r\n```\r\nunit MainUnit;\r\ninterface\r\nuses\r\n   PythonEngine,\r\n   System.Classes,\r\n   FMX.Forms, FMX.Controls, FMX.Controls.Presentation, FMX.StdCtrls, FMX.Types;\r\n\r\ntype\r\n   TFormMain = class(TForm)\r\n      ButtonRun: TButton;\r\n      procedure FormCreate(Sender: TObject);\r\n      procedure ButtonRunClick(Sender: TObject);\r\n      private\r\n         py: TPythonEngine;\r\n   end;\r\n\r\nvar\r\n   FormMain: TFormMain;\r\n\r\nimplementation\r\n{$R *.fmx}\r\n\r\nprocedure TFormMain.FormCreate(Sender: TObject);\r\nbegin\r\n   // Create python engine\r\n   py                     := TPythonEngine.Create(Self);\r\n   py.UseLastKnownVersion := True;\r\n   py.FatalAbort          := False;\r\n   py.FatalMsgDlg         := False;\r\n   // Load DLL\r\n   py.LoadDll;\r\nend;\r\n\r\nprocedure TFormMain.ButtonRunClick(Sender: TObject);\r\nbegin\r\n   // Simple script, that uses matplotlib and Py-QT5\r\n   var s: ANSIString := 'import matplotlib.pyplot as plt'#10\r\n         + 'plt.plot([1.6, 2.7])'#10\r\n         + 'plt.show()';\r\n   py.ExecString(s);\r\nend;\r\n\r\nend.\r\n```\r\n","author":{"url":"https://github.com/HawaiAl","@type":"Person","name":"HawaiAl"},"datePublished":"2023-02-03T12:46:43.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/409/python4delphi/issues/409"}