storing retrieveing Uint64 data

• julia Cline storing retrieveing Uint64 data Dec 26 2006, 17:25
  I'm trying to capture a time using suggestions from list users :
  
  UInt64 startTime = UnsignedWideToUInt64(AbsoluteToNanoseconds(UpTime()));
  
  I'd like to store the caputred times in an array object and retrieve them later for calculating reaction times to an onscreen display.
  
  I've tried using:
  
  UInt64 startTime = UnsignedWideToUInt64(AbsoluteToNanoseconds(UpTime()));
  printf (" \n\nstart time %llu  ", startTime);  //checking value
  pass ++;
  printf ("at pass = %d\n\n", pass);  //tracking iteration through method
  [nextButtonPressed insertObject:  [NSNumber numberWithUnsignedLongLong: startTime] atIndex:pass]; //hopefully putting value into array
  NSLog(@"\nafter storage starttime is %llu\n\n",[[nextButtonPressed objectAtIndex:pass] longLongUnsignedValue]);  //checking value to compare to original
  
  The log output looks like this:
  
  start time 73580042471882  at pass = 1
  
  2006-12-26 08:16:43.544 WordView[5736]
  after storage starttime is 4294967296
  
  The value that I think I am storing is not the one that I am retrieveing.  Can anyone help me understand what is going on?
  
  Also,  should I be using NSArrayController.  I discovered it with all its nifty actions, but i can't get it to instantiate and I haven't locate any documentation about it.  If I should use it, where can I find some references that discuse how to use it?
  
  thanks,
  
  Julia
• mmalc crawford Re: storing retrieveing Uint64 data Dec 26 2006, 18:04
  On Dec 26, 2006, at 8:25 AM, julia Cline wrote:
  
  

  > Also,  should I be using NSArrayController.  I discovered it with
  > all its nifty actions, but i can't get it to instantiate and I
  > haven't locate any documentation about it.  If I should use it,
  > where can I find some references that discuse how to use it?
  >
  

  <http://www.google.com/search?rls=en-us&q=NSArrayController>
  
  mmalc
• Nir Soffer Re: storing retrieveing Uint64 data Dec 26 2006, 19:37
  On Dec 26, 2006, at 18:25, julia Cline wrote:
  
  

  > UInt64 startTime = UnsignedWideToUInt64(AbsoluteToNanoseconds(UpTime
  > ()));
  > printf (" \n\nstart time %llu  ", startTime);  //checking value
  > pass ++;
  > printf ("at pass = %d\n\n", pass);  //tracking iteration through
  > method
  > [nextButtonPressed insertObject:  [NSNumber
  > numberWithUnsignedLongLong: startTime] atIndex:pass]; //hopefully
  > putting value into array
  

  
  Hopefully ? :-)
  
  The way to append values to an array is addObject: and not
  insertObject:. I guess that you can remove the "pass" temporary if
  you use addObject.
  
  Read file:///Developer/ADC%20Reference%20Library/documentation/Cocoa/
  Conceptual/Collections/index.html
  
  Are you sure that "nextButtonPressed" is a proper name for a
  collection of timestamps?
  
  

  > NSLog(@"\nafter storage starttime is %llu\n\n",[[nextButtonPressed
  > objectAtIndex:pass] longLongUnsignedValue]);  //checking value to
  > compare to original
  >
  > The log output looks like this:
  >
  > start time 73580042471882  at pass = 1
  >
  > 2006-12-26 08:16:43.544 WordView[5736]
  > after storage starttime is 4294967296
  

  
  Maybe its difference between printf and NSLog formatting?
  
  This is an easier and more correct way to check:
  
      UInt64 nano = UnsignedWideToUInt64(AbsoluteToNanoseconds(UpTime
  ()));
  
      NSNumber *nanoNumber = [NSNumber numberWithUnsignedLongLong:nano];
  
      assert(nano == [nanoNumber unsignedLongLongValue]);
  
  Best Regards,
  
  Nir Soffer