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

..

Answer 4

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 5

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 6

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

Answer 7

Thanks Badgirl MIRI