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Re: User preferences

From: Richard Frith-Macdonald
Subject: Re: User preferences
Date: Thu, 16 Dec 2004 06:03:37 +0000

On 15 Dec 2004, at 23:50, Samuel Hornus wrote:

Hi !

Being happy with my little GUI, I would like to store/retreive some user
preferences. NSUserDefaults seems the way to go, and after reading some
(but certainly not the most relevant :-( ) documentation, I followed the
advices from this web page: UserDefaults/Tasks/UsingDefaults.html#//apple_ref/doc/uid/20000719

Looks fine ... nothing there which should not work in GNUstep.

Needless to say, it does not work. I kinda feel that I may need to
supply some "default domain name" to the NSUserDefaults, but I can't see

No, you don't need to supply a domain name.

Do you have some clues about saving some prefs and retrieving them ?
What need be added to the code examplified in the webpage above ?
Thank you in advance !

To save -

// Set a default string in the default domain for the application
[[NSUserDefaults standardUserDefaults] setObject: @"aValue" forKey: @"aKey"];

// Retrieve the value from the defaults system
value = [[NSUserDefaults standardUserDefaults] objectForKey: @"aKey"];

* NB. when a default value is set, it is cached in memory and not written to disk until * later on when the run loop is running and a regular housekeeping timer goes off. * If your program exits shortly after setting a default, or if your program is not using * a run loop, you need to explicitly flush the cached default data to disk by calling * the synchronize method. The apple documentation does talk about this, but perhaps
 * not as clearly as it should.
[[NSUserDefaults standardUserDefaults] synchronize];

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