问题
Is there anyway that we can detect when the system/screen gets locked and notify some event to trigger in Ubuntu ?
回答1:
There is a possibility to be notified when the screen becomes locked/unlocked with DBus, this is reference on GnomeScreensaver showing the basics of it.
I am not DBus expert, but there are bindings for python, so you can listen for DBus events in python. Combinig the two, you should be able to get what you want:-).
Here is a python-dbus programming tutorial on wikibooks.
来源：https://stackoverflow.com/questions/2395579/detect-workstation-system-screen-lock-using-pythonubuntu