Launching a subprocess under OSX?

Phil Davis revdev at pdslabs.net
Thu Dec 29 21:23:29 CET 2016


Hi Paul,

In the Mac world, I find that if my app starts a true command-line tool 
(like SOX or FFMPEG or mediainfo) with 'open process' or 'shell()', all 
is well - no indication of its execution is visible to the user of my 
app. Of course those tools are designed to be command-line only - no 
bundle, no built-in UI.

If, on the other hand, my app launches a document with Word, I do see 
Word active in the Dock. And Word is a regular app bundle, unlike the 
command-line tools I mentioned.

Don't know if there is a definite relationship between the helper app's 
internal structure and its visibility in the Dock when running, but I 
thought I would at least share my experience.

Maybe there's a setting you can fiddle with in the helper app's plist 
that would make it run invisible? (Sounds like a potential can of worms 
but it might work)

Thanks -
Phil Davis


On 12/29/16 11:44 AM, Paul Dupuis wrote:
> On Windows, I can launch a subprocess using:
>
> open process tHelperApp for text update
>
> And I get a subprocess that does not appear as a separate running app to
> the user. They do not see it appear in the task bar. There is no
> apparent change to the running app that launched the helper. It just
> shows up in task list if you bring up the task manager with CTRL-ALT-DEL
> which is fine.
>
> On OSX (10.9.5), both 'launch thelperApp' and 'open process tHelperApp
> for text update' start the helper app but also brings it to the front
> (active app - you can see its menu - only the Apple and App name default
> menus) and it appears in the dock. This is undesirable.
>
> Does any one know how to launch a real subprocess under OSX from
> LiveCode that stay hidden or in the background at least?
>
>
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-- 
Phil Davis




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