Digital Hub Scripting
You probably have your computer set up so that when you insert a music CD, the application iTunes runs. This is one example of a general phenomenon called digital hub scripting: when a DVD, or a CD that doesn’t consist of ordinary files, is inserted into your computer, the System can react by sending an Apple event to a designated application. You can interpose your own code in this process: instead of iTunes, when an event like this occurs, an applet of your choice is notified, and can react in any desired manner.
In the CDs & DVDs pane of System Preferences are the settings
that determine how the System reacts to a disk-insertion event. You
can determine what application should be notified when the disk is
inserted. If this application is an applet, it should be prepared to
receive an Apple event corresponding to what sort of disk was
inserted. The terminology for these Apple events is defined in the
dictionary of the Digital Hub Scripting
scripting addition. (Therefore the parameter does not need to appear
in parentheses at the start of the definition.)
Let’s say we want to take charge of what happens
when a music CD is inserted. We’ll create an applet
called musicListener
. In the CDs & DVDs pane
of System Preferences, we use the Open Other Application menu item to
set musicListener
as the target application to
respond when a music CD being inserted. In
musicListener,
the music CD appeared
handler will be called when a music CD is
inserted.
To illustrate, ...
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