How do I get the security type (and other information) of the currently connected network in Airport in my Objective-C / Cocoa program?
See the apple documentation on the SysConfig API, which allows you to read that and many properties of network connections:
http://developer.apple.com/library/mac/#documentation/Networking/Reference/SysConfig/index.html
来源：https://stackoverflow.com/questions/4021095/using-cocoa-objective-c-get-currently-connected-networks-security-type-in-ma