Itia Gerbi wrote:
> I'm using:
>
> Process p = Runtime.getRuntime().exec(i_cmdLine);
>
> retVal = p.waitFor();
>
> the waitFor() returns after the script was started to run,
>
> but it doesn't wait for the for the script to be completed.
>
> I need some indication to know when the apple script completed its work.
>(in my case the script is generating some files, so I need to know when
>the files where generated)
There's no way I know of to get what you want without some kind of
cooperation from the script that's running asynchronously.
The problem isn't unique to exec(), nor to scripts. The problem is
fundamental to any kind of asynchronous operation. If the async action
can't provide SOME kind of signifier, either as an intentional signifier or
as a side-effect, then it's simply impossible to accurately determine when
it's done.
An intentional signifier would be a file or an event that the script itself
creates or sends when it's done.
Side-effects would include things like looking for the appearance of a
file, looking for the termination of a descendant process, looking for the
absence of a process with a particular name, waiting a maximum elapsed
time, and other hacks. These are all hacks, and unreliable.
Under normal scripting conditions, how would a scripter who's using the
script find out when it's finished? To answer that, you need to refer to
the docs of the async script, or look at its source code.
-- GG
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