This class has one simple purpose: Terminate the application, once a certain date has been reached.
You just pass the class a date (the date the trial should end) and a termination message and the class does the rest.
If the date is before the current date, it will terminate immediately (showing a termination message), if it's some where in the future, it will start a timer and will then terminate the application.

ESSTimeTrialClass source preview

//
//  ESSTimeTrialClass.m
//  Cave Canem
//
//  Created by Matthias Gansrigler on 5/12/07.
//  Copyright 2007 Eternal Storms Software. All rights reserved.
//

#import "ESSTimeTrialClass.h"

static ESSTimeTrialClass *myClass = nil;

@implementation ESSTimeTrialClass

+ (ESSTimeTrialClass *)timeTrialWithEndDate:(NSDate *)date endMessage:(NSString *)aString
{
  if (date && aString)
  {
    if (!myClass)
    {
      myClass = [[ESSTimeTrialClass alloc] initWithEndDate:date endMessage:aString];
    }
    return myClass;
  }
  return nil;
}

- (id)initWithEndDate:(NSDate *)date endMessage:(NSString *)aString
{
  if (date && aString)
  {
    if (self = [super init])
    {
      [self setEndDate:date];
      [self setEndMessage:aString];
      timerIsRunning = NO;
      [self startTimer];
      return self;
    }
  }
  return nil;
}

- (void)setEndDate:(NSDate *)date
{
  [endDate release];
  endDate = [date retain];
}

- (void)setEndMessage:(NSString *)aString
{
  aString = [aString copy];
  [endMessage release];
  endMessage = aString;
}

- (void)startTimer
{
  if (![[[NSDate date] laterDate:endDate] isEqualToDate:endDate])
  {
    NSRunAlertPanel(@"This Software has expired",endMessage,@"OK",nil,nil);
    [NSApp terminate:nil];
  } else
  {
    if (!timerIsRunning)
    {
      timer = [[NSTimer scheduledTimerWithTimeInterval:[endDate timeIntervalSinceNow] target:self selector:@selector(quit:) userInfo:nil repeats:NO] retain];
      timerIsRunning = YES;
    }
  }
}

- (void)endTimer
{
  if (timerIsRunning)
  {
    [timer invalidate];
    [timer release];
    timer = nil;
    timerIsRunning = NO;
  }
}

- (void)quit:(NSTimer *)aTimer
{
  NSRunAlertPanel(@"This Software has expired",endMessage,@"OK",nil,nil);
  [NSApp terminate:nil];
}

- (void)dealloc
{
  NSLog(@"aha");
  [endMessage release];
  [endDate release];
  if (timerIsRunning)
  {
    [timer invalidate];
    [timer release];
  }
  [super dealloc];
}

@end

ESSTimeTrialClass header preview

//
//  ESSTimeTrialClass.h
//  Cave Canem
//
//  Created by Matthias Gansrigler on 5/12/07.
//  Copyright 2007 Eternal Storms Software. All rights reserved.
//

#import <Cocoa/Cocoa.h>


@interface ESSTimeTrialClass : NSObject
{
  NSDate *endDate;
  NSString *endMessage;
  NSTimer *timer;
  BOOL timerIsRunning;
}
+ (ESSTimeTrialClass *)timeTrialWithEndDate:(NSDate *)date endMessage:(NSString *)aString;
- (id)initWithEndDate:(NSDate *)date endMessage:(NSString *)aString;
- (void)startTimer;
- (void)endTimer;
- (void)setEndDate:(NSDate *)date;
- (void)setEndMessage:(NSString *)aString;
@end

Compatible with:

• Mac OS X 10.3
• Mac OS X 10.4 PPC
• Mac OS X 10.4 Intel
• Mac OS X 10.5 PPC
• Mac OS X 10.5 Intel

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