Cheat Engine

[dlpb]

Assuming I have a function

Function MyFunction (A, B: Integer): Boolean;
Begin
End;


How would I call that so that it is used in a new thread. You see, I have a lot of things to be doing in my functions that affect the main thread if they aren't being used from a separate thread.

I use Delphi 7.

[STN]

MyFunction(1,2); ?

Just create a thread, loop it with a sleep (so it doesn't exit or eats all cpu) and call your function

[dlpb]

The problem is that this function will be called from a hijacked function. I use a DLL. So...

[atom0s]

Are you trying to fully take over the function or just add your call to it?

[dlpb]

[dlpb]

I overthought this.

It can be done v easily for the parts I need using

CreateThread(nil, 0, @CustomMusicFadeOut, nil, 0, dwtemp);

[dlpb]

What happens when a thread ends - like above when I call that and it ends naturally after all operations are complete.

Is there a leak? Will the memory be freed?

I guess I have to save the handle and then free it.

----------

It's cool. I found the answer. Seems I do need to close the thread properly

http://www.delphibasics.co.uk/RTL.asp?Name=BeginThread

That's the best way to do this in Delphi that I've seen.

[Dark Byte]

when a thread exists it calls terminatethread, so there's no need to do anything.
At most call closehandle on the result of createThread, but you can do that even before the thread has finished (e.g right after createthread)

[dlpb]

Yeah, that is something I am sure a lot of people don't realize. Nor did I until you confirmed it.

It seems that "Endthread" is still required though (when using beginthread)? This calls api ExitThread.

What happens if this isn't called? Or does delphi clean up a beginthread / createthread regardless? Is that what you are saying? It seems that people using C / C++ disagree - so perhaps those languages require manual clean up?

[Dark Byte]

when the createthread api creates a new thread, it's stack is setup in such a way, that the last ret instruction will jump to exitthread, therefore, just exiting the function will cause the thread to self terminate

same in Delphi , the thread will eventually call the last 'ret' and then self destruct.

[dlpb]

[Dark Byte]

it's faster than having to fall back to the end of the function. (e.g inside a function called by another function called by another function , etc...)

[dlpb]

This stuff really needs to be documented better by MS and so on. Thanks! I'll add you as a thank you credit.

[atom0s]

[dlpb]

Yeah, I already checked it. It calls the api ExitThread, though, I recall.

Edit. Yeah, also says so in your links.