http://imagej.273.s1.nabble.com/Is-it-possible-to-send-a-command-to-a-running-copy-of-ImageJ-via-a-socket-tp5024089p5024109.html
> Hi and thanks for your reply.
>
> The problem with his approach for my use case is that I wish to open
> images in ImageJ from another Java application. I could use a
> java.lang.Runtime.exec(String command) but this would be messy
> necessitating different OS-specific command strings to constructed for each
> platform.
>
> Since ImageJ already can interpret various scripting languages (its own
> macro scripts and also javascript), it seems a shame that there is not just
> a socket one can send a piece of javascript or macro scripting language to
> drive ImageJ remotely.
>
> A nice benefit is that an ImageJ could take a command-line argument to
> determine whether the sockets accepted requests for local and or remote
> access thus making it possible to drive ImageJ remotely from a different
> computer.
>
> I might consider implementing this as a plugin if this functionality does
> not already exist. I have used this approach elsewhere. I just dod not want
> to start reinventing the wheel if ImageJ already had this.
>
> -- Michael Ellis
>
>
>
>
> October 23, 2020 1:30 PM, "Stein Rørvik" <
[hidden email]> wrote:
>
> > Can't you just open ImageJ via the OS, with the multiple instance
> listener active?
> > Then subsequent commands will use the same instance.
> > You can use of the -port option to pass the command to one of several
> instances.
> >
> > The following works as expected in a Windows command batch file:
> >
> > start ImageJ.exe -eval "eval('script',
> 'IJ.getInstance().setTitle(\"ImageJ default\")');"
> > start ImageJ.exe -port1 -eval "eval('script',
> 'IJ.getInstance().setTitle(\"ImageJ at port 1\")');"
> > start ImageJ.exe -port2 -eval "eval('script',
> 'IJ.getInstance().setTitle(\"ImageJ at port 2\")');"
> > timeout 10
> > start ImageJ.exe -eval "print('hello from ImageJ at the default port')"
> > start ImageJ.exe -port1 -eval "print('hello from ImageJ at port 1')"
> > start ImageJ.exe -port2 -eval "print('hello from ImageJ at port 2')"
> > timeout 3
> > start ImageJ.exe -eval "print('another hello from ImageJ the default
> port')"
> > start ImageJ.exe -port1 -eval "print('another hello from ImageJ at port
> 1')"
> > start ImageJ.exe -port2 -eval "print('another hello from ImageJ at port
> 2')"
> >
> > Here we have three instances running; I start each instance with a small
> JavaScript to rename the
> > main window in order to easier tell the difference between them. Then we
> can pass commands,
> > specifying which instance we want each of the commands to execute in.
> The "timeout 10" command
> > inserts a 10 seconds delay to give sufficient time for all three
> instances of ImageJ to launch,
> > before we start passing commands to each of them. Opening an image or
> running a macro in each
> > instance will work the same way.
> >
> > I use the "start" command to launch ImageJ asynchronously, or else the
> Windows script would wait
> > until each instance of ImageJ has quit. Since this runs asynchronously,
> we need to add an
> > appropriate delay between subsequent commands to the same instance, to
> allow whatever command you
> > passed to it to finish; in this case 3 seconds.
> >
> > Stein
> >
> > -----Original Message-----
> > From: ImageJ Interest Group <
[hidden email]> On Behalf Of Michael
> Ellis
> > Sent: 19. oktober 2020 14:37
> > To:
[hidden email]
> > Subject: Is it possible to send a command to a running copy of ImageJ
> via a socket?
> >
> > Hello all.
> >
> > Is it possible to send a command to a running copy of ImageJ via a
> socket?
> >
> > The sort of thing I had in mind could be illustrated with the unix 'nc'
> command as follows:
> >
> > $ echo 'open /path/to/file/Meta1.tif' | nc localhost 57294
> >
> > I can see that ImageJ can use Socket ports to prevent multiple instances
> of ImageJ from running but
> > I cannot see how to explicitly send a command via a Socket.
> >
> > My final use case is from my own standalone java application to be able
> to request an already
> > running copy of ImageJ open an image file.
> >
> > If this is not possible is there already an ImageJ plugin that already
> written that does the job?
> >
> > As ever thanks in advance for any help.
> > Michael Ellis
> >
> > Digital Scientific UK Ltd
> >
> > --
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