UDID number to identify a user

Question

Hello StackOverflow members :) I wonder if it's possible to send the UDID number in order to authenticate an user of my app ,with a call to a web service?

In my database, I will have the UDID as a primary key and the number of availables credits referenced to this key.

Is it allowed by Apple ? And if it is, how can I get the UDID programmatically?

Answer 1

It is possible to get the serial number but I think it is not recommended to use UDID

for serial number you could use this code

- (NSString*)getSerialNumber
{
    CFTypeRef serialNumberAsCFString;
    io_service_t platformExpert = IOServiceGetMatchingService(
        kIOMasterPortDefault, IOServiceMatching("IOPlatformExpertDevice"));
    if (platformExpert)
        {
            serialNumberAsCFString = IORegistryEntryCreateCFProperty(
                platformExpert, CFSTR(kIOPlatformSerialNumberKey), 
                kCFAllocatorDefault, 0);
        }
    IOObjectRelease(platformExpert);
    NSString *serial = 
        [[NSString alloc] initWithFormat:@"%@",serialNumberAsCFString];
    return serial;
}

Reference for the code

However you could try this line of code for getting the UDID, which I am not sure if it will give the required results. Apple may reject the app and this UDID feature is deprecated in the newer versions of iOS.

NSString *uid;
uid= [[UIDevice currentDevice] uniqueIdentifier];
NSLog(@"udid is %@",uid);