[iOS] Objective-c NSString to Hex string

Objective-c NSString to Hex string

NSData *data = [self parseMacAddress:@"AABBCCDDEEFF "];

NSLog(@"After transfer: %@", data); 

= > AABBCCDDEEFF (Hex)

- (NSData *)parseMacAddress:(NSString *)address {

    

    NSArray *components = [address componentsSeparatedByString: @"-"];

    NSString *mac = (NSString *)[components objectAtIndex:4];

    

    const char *buf = [mac UTF8String];

    NSMutableData *temp = [[NSMutableDataalloc] init];

    

    if (buf) {

        uint32_t len = strlen(buf);

        char singleNumberString[3] = {'\0', '\0', '\0'};

        uint32_t singleNumber = 0;

        for(uint32_t i = 0 ; i < len; i+=2)

        {

            if ( ((i+1) < len) && isxdigit(buf[i]) && (isxdigit(buf[i+1])) )

            {

                singleNumberString[0] = buf[i];

                singleNumberString[1] = buf[i + 1];

                sscanf(singleNumberString, "%x", &singleNumber);

                uint8_t tmp = (uint8_t)(singleNumber & 0x000000FF);

                [temp appendBytes:(void *)(&tmp)length:1];

            }

            else

            {

                break;

            }

        }

    }

    

    NSData *macData = temp;

    NSLog(@"%@", macData);

    return macData;

}