How to terminate anonymous threads in Delphi on application close?

Question

I have a Delphi application which spawns 6 anonymous threads upon some TTimer.OnTimer event.

If I close the application from the X button in titlebar Access Violatio

Answer 1

Make your threads watch for some kind of notification from the outside. This could be an event that gets signaled, a message sent to a window owned by the thread, a command sent over a socket that your thread listens to, or whatever other form of communication you find.

If you determine that this problem is because your threads are so-called "anonymous" threads, then a simple workaround is for you to make them be non-anonymous threads. Put the body of the anonymous function into the Execute method, and pass any captured variables to the thread class via its constructor.