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Asked: 2026-05-23T21:36:36+00:00

I have created a class that derives from TThread, because I wish to do

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I have created a class that derives from TThread, because I wish to do some async stuff, however to avoid having to create another class, I built the entire thing around that thread class. Not sure if this is good practice or not, and if I cant get this to work, well then I suppose I have no choice but to recode..

The problem: I create the Thread on FormCreate, assign some properties, and I Free it on FormDestroy. In the Thread’s constructor, I set FreeOnTerminate = False. When I click on a button on my Form, I Start(); the Thread. Okay, so it runs as expected, an error occurs (expected!), its being passed to my error handling event, and it appears to terminate. I then click the button again, and I get a Cannot call Start on a running or suspended thread error.

How can I finish the thread without freeing it, and enabling me to start it again?

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1 Answer

  1. Editorial Team

    You can’t restart a thread once it is finished/terminated. In that case you should just create a new instance if the thread again like you did in FormCreate.

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