iphone :How to create unique ID to identify the user

Question

In my app i want to create unique App ID foe every user..I heard about GUID which is used to create the unique Id for users.so how do i generate this GUID?Thanks in advance.

Maulik · Accepted Answer · 2012-01-19T05:52:26.087

2

[[UIDevice currentDevice] uniqueIdentifier]

Returns the Unique ID of your iPhone.

If you need to create several UUID, just use this method:

+ (NSString *)GetUUID
{
  CFUUIDRef theUUID = CFUUIDCreate(NULL);
  CFStringRef string = CFUUIDCreateString(NULL, theUUID);
  CFRelease(theUUID);
  return [(NSString *)string autorelease];
}

NOTE : A UUID created by CFUUIDCreate is unique if a user uninstalls and re-installs the app: you will get a new one each time.

Also UUID is deprecated in iOS 5.

edited Jan 19 '12 at 05:52

answered Jan 19 '12 at 05:45

Maulik

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then what is the option in iOS5 – Developer Jan 19 '12 at 06:27
you can use MAC address of your device as X Slash has mentioned ! – Maulik Jan 19 '12 at 06:28

score 1 · Answer 2 · edited May 23 '17 at 10:34

1

UUID is deprecated in iOS 5, but you can always use MAC Address

How can I programmatically get the MAC address of an iphone

edited May 23 '17 at 10:34

Community

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answered Jan 19 '12 at 05:49

X Slash

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@X Slash, is the MAC addr constant across network interfaces when the user shifts back and forth from Wi-Fi and cellular connections? – Crashalot Apr 09 '12 at 06:01
MAC address is fixed for any given network interface. A WiFi network card has a separate MAC address from a cellular network card for instance. – Stunner Sep 19 '12 at 00:58

jww · Answer 3 · 2012-09-19T00:53:44.267

This is somewhat off topic since you are asking about users, but you might also need something for a unique device (fingerprint). Have a look at Keychain Services Reference and three kSecAttrAccessible constants: kSecAttrAccessibleAlwaysThisDeviceOnly, kSecAttrAccessibleAfterFirstUnlockThisDeviceOnly, and kSecAttrAccessibleWhenUnlockedThisDeviceOnly.

The constants should help thwart copy/paste attacks assuming Apple generates a value coupled to a device, similar to [[UIDevice currentDevice] uniqueIdentifier]. However, I have never verified the behavior in practice.

score 0 · Answer 4 · answered Feb 24 '12 at 09:20

One more solution same as Maulik suggested...

This is about creating unique file names... But this can be apply to anything...that needs to be unique...

NSString *filePath;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
path = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"SomeDirectoryName"];

//Create unique filename
CFUUIDRef newUniqueId = CFUUIDCreate(kCFAllocatorDefault);
CFStringRef newUniqueIdString = CFUUIDCreateString(kCFAllocatorDefault, newUniqueId);
path = [path stringByAppendingPathComponent:(NSString *)newUniqueIdString];
path = [path stringByAppendingPathExtension: @"MOV"];
CFRelease(newUniqueId);
CFRelease(newUniqueIdString);

iphone :How to create unique ID to identify the user

4 Answers4