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Programming in Objective-C is a concise, carefully written tutorial on the basics of Objective-C and object-oriented programming. The book makes no assumption about prior experience with object-oriented programming languages or with the C language (upon which Objective-C is based). And because of this, both novice and experienced programmers alike can use this book to quickly and effectively learn the fundamentals of Objective-C.

Posted By

zingo on 08/03/07


Tagged

osx objc macro expire xcode gcc


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tcol
joellevin


kill app after expire date

Published in: Objective C 

URL: http://www.red-sweater.com/blog/371/suicidal-code

Using a gcc predefined macro, __DATE__, the code can know for itself when it was compiled, and build in an expiration date based on that value.


Plain TextExpand 
  1. // Two-week expiration
  2. #define EXPIREAFTERDAYS 14
  3.  
  4. #if EXPIREAFTERDAYS
  5.    // Idea from Brian Cooke.
  6.    NSString* nowString =
  7.       [NSString stringWithUTF8String:__DATE__];
  8.    NSCalendarDate* nowDate =
  9.       [NSCalendarDate dateWithNaturalLanguageString:nowString];
  10.    NSCalendarDate* expireDate =
  11.       [nowDate addTimeInterval:(60*60*24* EXPIREAFTERDAYS)];
  12.  
  13.    if ([expireDate earlierDate:[NSDate date]] == expireDate)
  14.    {
  15.       // Run an alert or whatever
  16.  
  17.       // Quit!
  18.       [NSApp terminate:self];
  19.    }
  20. #endif

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