On Oct 13, 2008, at 9:45 PM, XiaoGang Li wrote:
I have a cmd-line application and also a GUI application, when
cmd-line app get specified information from low-level service, it will
launch the GUI app to tell user that something happens. but the low-
level
service maybe send the specified info multiple times. so if the GUI
app is
running, the cmd-line should not launch it again, I means there
should not
have two same GUI app running in the front at the same time.
SO, my question is that what cmd-line should do? how to check
this case?
can someone give me some point. I have no idea about this even no
key words
to google it. thanks very much.
The command-line app should be using Launch Services (rather than
NSTask or fork+exec) to launch the GUI app. By default, Launch
Services won't launch two instances of the app, so you get the
behavior you're looking for "for free".
Cheers,
Ken
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