Access to vcl component in thread! Delphi?

The cause of the AV is that you pass the address of a TForm method to a function that expects a TThreadFunc (see the documentation of System.BeginThread() ). Using Addr() like this is a good way to keep the compiler from pointing out your bugs.

The VCL (Gui components) is only to be accessed from the main thread. Other threads need the main thread to access the VCL.

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