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- #import <CommonCrypto/CommonDigest.h>
- @implementation NSObject (Utility)
- - (NSString*)uniqueID
- {
- // nsobject --> nsdata -- > md5 hash --> hex string (30 chars)
- NSData *data = [NSKeyedArchiver archivedDataWithRootObject:self];
- unsigned char result[CC_MD5_DIGEST_LENGTH];
- CC_MD5([data bytes], (uint32_t)[data length], result);
- return [NSString stringWithFormat:
- @"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
- result[0], result[1], result[2], result[3],
- result[4], result[5], result[6], result[7],
- result[8], result[9], result[10], result[11],
- result[12], result[13], result[14], result[15]
- ];
- }
- @end
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