Xcode Objective C How to write in system's directory (Mac Os)? -



Xcode Objective C How to write in system's directory (Mac Os)? -

i want write txt file in /macintosh hd/library/preferences folder:

nsstring *fullpath = [@"/library/preferences" stringbyappendingpathcomponent:@"some_txt_file.txt"]; nsstring *str = @"some text"; [str writetofile:fullpath atomically:true encoding:nsutf8stringencoding error:null];

but not working. if alter properties "read , write" in window, code working:

http://s52.radikal.ru/i135/1411/d0/32babf6a05a0.png

when alter options, scheme inquire me password!

how can inquire password , receive administrator promts write in directory cocoa application mac os, when click button?

many thanks!

first of should reconsider whether need write here , not ~/library/preferences (in user directory rather root). preferences per-user things.

if need write in /library/preferences (root) need elevated privleges. apple provides sample of here. note unless i'm mistaken, app rejected if planning set in on mac app store.

objective-c xcode osx cocoa

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