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- (NSString *)convertDataToHexStr:(NSData *)data{ if (!data || [data length] == 0) { return @""; } NSMutableString *string = [[NSMutableString alloc] initWithCapacity:[data length]]; [data enumerateByteRangesUsingBlock:^(const void *bytes, NSRange byteRange, BOOL *stop) { unsigned char *dataBytes = (unsigned char*)bytes; for (NSInteger i = 0; i < byteRange.length; i++) { NSString *hexStr = [NSString stringWithFormat:@"%x", (dataBytes[i]) & 0xff]; if ([hexStr length] == 2) { [string appendString:hexStr]; } else { [string appendFormat:@"0%@", hexStr]; } } }]; return string;}this works.