How to set desktop wallpaper and screen-saver?

How to set des开发者_如何学JAVAktop wallpaper and screen-saver from cocoa app?

If you're on Mac OS X 10.6, NSWorkspace has some new methods for setting the desktop picture. The one you want is setDesktopImageURL:forScreen:options:error:.

As for screen saver, there's no supported way to do this programatically. You could modify the com.apple.screensaver plist file and set the following keys:

• moduleName <-- screen saver name
• idleTime <-- interval in seconds
• modulePath <-- path to screen saver file

However, this could break at any time so I would not rely on it.