NSRunningApplication.activationPolicy might do the trick for you.

-Ken


> On Nov 26, 2015, at 11:58 PM, Jerry Krinock <je...@ieee.org> wrote:
> 
> Several years ago I succumbed to a few users who wanted the ability to switch 
> my OS X apps between foreground (regular app) and background (LSUIElement) on 
> the fly.  Switching has been possible in both directions since OS X 10.7, 
> using TransformProcessType().  The user interface is, for example, a 
> NSStatusItem (aka “menu extra”).
> 
> However, in 10.9, Apple deprecated all Process Manager API *except* 
> TransformProcessType().  The deprecated ProcessInformationCopyDictionary(), 
> in particular, was the only way to determine the *current* process type.  
> (The dictionary it returned could have keys LSUIElement or LSBackgroundOnly.)
> 
> Without this API, the only way I have to know the current type is to ask 
> NSBundle if Info.plist has LSUIElement when the app launches, and keep track 
> of when I change it.  It works, but, I think, not very robust.
> 
> Does anyone know of a non-deprecated way to determine process type?  I’ve 
> reviewed NSRunningApplication pretty carefully but this capability appears to 
> have not survived the “upgrade” from Process Manager :(
> 
> Jerry
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