QtEndian可以转换
T qFromBigEndian ( const uchar * src )
T qFromBigEndian ( T src )
T qFromLittleEndian ( const uchar * src )
T qFromLittleEndian ( T src )
void qToBigEndian ( T src, uchar * dest )
T qToBigEndian ( T src )
void qToLittleEndian ( T src, uchar * dest )
T qToLittleEndian ( T src )