[erlang-questions] Can werl be detached?

John R. Ashmun <>
Wed May 18 03:48:35 CEST 2016


On Tue, May 17, 2016 at 6:32 PM, zxq9 <> wrote:

> On Tuesday 17 May 2016 16:47:35 John R. Ashmun wrote:
> > Perhaps my subject is not quite the correct question.  Here's my context:
> >
> > I'm beginning to recreate in Erlang on Microsoft Windows 10 a public
> domain
> > program I used to enjoy on my Commodore Amiga:  mATC was a game in which
> > the user acted as a military Air Traffic Controller.  I am using a wx
> > window to draw the player's map with aircraft data blocks overlaid.  I
> > don't have a use for the initial window that opens when werl is started.
>
> Awesome!
>
> > If I use this Command Prompt batch file, mATC.bat:
> >
> > werl -pa ebin -pa mATC_app\ebin -detached -boot mATC -config sys
> >
> > a Windows error message window appears that says:
> >
> > "Failed to execute C:\Program Files\erl5.9\erts5.9\bin\beam.smp.dll
> >  The system cannot find the file specified."
> >
> > The DLL is actually present at that location, and of course everything
> runs
> > well when I don't use -detached.
>
> Hrm... that seems odd, but I have to admit I have no experience running
> actual releases on Windows. What I usually do instead is have the runtime
> installed on the Windows machine, unpack project code and kick things off
> with an escript that builds and then launches the code I want to run.
>
> Changing from releases to from-source build->run may require a bit of
> shuffling -- and may or may not be worth it depending on the project.
> But this has been very effective and lightweight for my purposes.
>
> Like everything else on Windows there are a few quirks to making escripts
> a click-to-run experience (specifying full path to "escript.exe" instead
> of "escript" in your launcher, space for unheeded shebang, etc.). I've
> wanted for a few years now to formalize and simplify a solution to this...
> but real life gets in the way of the things I wish I could do as community
> project work. :-(
>
> The escript-to-bootstrap approach has made my Erlang GUI experience on
> Windows fairly painless -- I can develop on Linux or BSD and almost always
> get away with relying on anything that works there (to include wx) working
> pretty much the same way on Windows.
>
> I have not tried this on Windows 10 yet, but I assume it will continue to
> work the same way it does on Windows 7 and 8.1.
>
> -Craig
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I will look into escript, thanks.

John
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