B4J Question Only one instance of an app

[Bruce Axtens]

How do I make sure that there's only ever one instance of my B4J app running.VB6 had

The PrevInstance property in Visual Basic 6.0 determines if an instance of the application is already running. Typically you call PrevInstance on application startup and abort the application if it returns true.

Is there anything equivalent in B4J?

 

[Erel]

If you are only targeting Windows then you can use Launch4j to convert the jar file to an exe file and also allow a single instance of it:

A cross platform solution is more difficult. You can open a specific port with ServerSocket and if it fails then the app is already open.

 

[Bruce Axtens]

Thanks, Erel. Just what I'm looking for.