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copied!<p>I would also suggest changing over from <code>uniqueIdentifier</code> to <a href="https://github.com/gekitz/UIDevice-with-UniqueIdentifier-for-iOS-5" rel="nofollow">this open source library</a> (2 simple categories really) that utilize the device’s MAC Address along with the App Bundle Identifier to generate a unique ID in your applications that can be used as a UDID replacement.</p> <p>Keep in mind that unlike the UDID this number will be different for every app.</p> <p>You simply need to import the included <code>NSString</code> and <code>UIDevice</code> categories and call <code>[[UIDevice currentDevice] uniqueDeviceIdentifier]</code> like so:</p> <pre><code>#import "UIDevice+IdentifierAddition.h" #import "NSString+MD5Addition.h" NSString *iosFiveUDID = [[UIDevice currentDevice] uniqueDeviceIdentifier] </code></pre> <p>You can find it on Github here:</p> <p><a href="https://github.com/gekitz/UIDevice-with-UniqueIdentifier-for-iOS-5" rel="nofollow">UIDevice with UniqueIdentifier for iOS 5</a></p> <hr> <p>Here are the categories (just the .m files - check the github project for the headers):</p> <blockquote> <p>UIDevice+IdentifierAddition.m</p> </blockquote> <pre><code>#import "UIDevice+IdentifierAddition.h" #import "NSString+MD5Addition.h" #include <sys/socket.h> // Per msqr #include <sys/sysctl.h> #include <net/if.h> #include <net/if_dl.h> @interface UIDevice(Private) - (NSString *) macaddress; @end @implementation UIDevice (IdentifierAddition) //////////////////////////////////////////////////////////////////////////////// #pragma mark - #pragma mark Private Methods // Return the local MAC addy // Courtesy of FreeBSD hackers email list // Accidentally munged during previous update. Fixed thanks to erica sadun & mlamb. - (NSString *) macaddress{ int mib[6]; size_t len; char *buf; unsigned char *ptr; struct if_msghdr *ifm; struct sockaddr_dl *sdl; mib[0] = CTL_NET; mib[1] = AF_ROUTE; mib[2] = 0; mib[3] = AF_LINK; mib[4] = NET_RT_IFLIST; if ((mib[5] = if_nametoindex("en0")) == 0) { printf("Error: if_nametoindex error\n"); return NULL; } if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0) { printf("Error: sysctl, take 1\n"); return NULL; } if ((buf = malloc(len)) == NULL) { printf("Could not allocate memory. error!\n"); return NULL; } if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) { printf("Error: sysctl, take 2"); return NULL; } ifm = (struct if_msghdr *)buf; sdl = (struct sockaddr_dl *)(ifm + 1); ptr = (unsigned char *)LLADDR(sdl); NSString *outstring = [NSString stringWithFormat:@"%02X:%02X:%02X:%02X:%02X:%02X", *ptr, *(ptr+1), *(ptr+2), *(ptr+3), *(ptr+4), *(ptr+5)]; free(buf); return outstring; } //////////////////////////////////////////////////////////////////////////////// #pragma mark - #pragma mark Public Methods - (NSString *) uniqueDeviceIdentifier{ NSString *macaddress = [[UIDevice currentDevice] macaddress]; NSString *bundleIdentifier = [[NSBundle mainBundle] bundleIdentifier]; NSString *stringToHash = [NSString stringWithFormat:@"%@%@",macaddress,bundleIdentifier]; NSString *uniqueIdentifier = [stringToHash stringFromMD5]; return uniqueIdentifier; } - (NSString *) uniqueGlobalDeviceIdentifier{ NSString *macaddress = [[UIDevice currentDevice] macaddress]; NSString *uniqueIdentifier = [macaddress stringFromMD5]; return uniqueIdentifier; } @end </code></pre> <blockquote> <p>NSString+MD5Addition.m:</p> </blockquote> <pre><code>#import "NSString+MD5Addition.h" #import <CommonCrypto/CommonDigest.h> @implementation NSString(MD5Addition) - (NSString *) stringFromMD5{ if(self == nil || [self length] == 0) return nil; const char *value = [self UTF8String]; unsigned char outputBuffer[CC_MD5_DIGEST_LENGTH]; CC_MD5(value, strlen(value), outputBuffer); NSMutableString *outputString = [[NSMutableString alloc] initWithCapacity:CC_MD5_DIGEST_LENGTH * 2]; for(NSInteger count = 0; count < CC_MD5_DIGEST_LENGTH; count++){ [outputString appendFormat:@"%02x",outputBuffer[count]]; } return [outputString autorelease]; } @end </code></pre>

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