How to allow one instance of exe

Question

Hi

I have an application which need to have only one instance of the application active at a time. What to do when we have to restrict one instance of exe is active?

Answer 1

I have done this in Windows via system API calls to get the list of running windows and see if your window title is in the list. I always felt that it needed to be more reliable than using the Title property, but it was the best idea I could find. It solved the problem and there were no reports that indicated otherwise.

Answer 2

google gave me this

https://cplusplus.com/forum/beginner/88988/

https://stackoverflow.com/questions/2285110/restrict-application-to-one-instance-per-shell-session-on-windows

Answer 3

Use a named mutex with some unique name then check for the enum ERROR_ALREADY_EXISTS

I can't remember how the code implementation looks like but I've tried it before on Qt and it works well

Answer 4

Thanks Bob_Li and Brian

Yeah, I too had an idea of title , but it is too initial thought .

More than this, is there a way to achieve this as platform independently (both linux and windows ) ?

Answer 5

I was also wondering about that, but it's os specific, it seems.

Answer 6

Thanks Badgirl MIRI

Answer 7

Thanks venom85jojes

Does python one is platform independent? If proc.info is having extension as .exe for name, will linux also has .exe extension?

Regarding last method, singleton class is limited to one application. Right? Or is it singleton across the os and user level ?