바이트 오더 형식 확인하기 위한 방법.

        switch(CFByteOrderGetCurrent()){

            case CFByteOrderUnknown:

                NSLog(@"UnKown");

                break;

            case CFByteOrderLittleEndian:

                NSLog(@"LittleEndian");

                break;

            case CFByteOrderBigEndian:

                NSLog(@"BigEndian");

                break;

        }