Set System Preferences using Objective-C

This is probably trivial, however I couldn't find any information online: How can I set any Apple preference using code? I would like to create a little application for myself that sets certain preferences when I click a button. For instance I would like to turn off Bluetooth and Wi-Fi. As far as I know, these preferences are stored in /Users/fabian/Library/Preferences/com.apple.*.plist.

S开发者_运维知识库o: how can I change these preferences and make sure they are applied?

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The CoreFoundation CFPreferences API allows for editing of defaults outside of the current application's defaults domain.

Note that you'll likely need administrative privileges to edit many network related defaults.