QT的基本数据类型
qint8：signed char
qint16:signed short
qint32：signed int.
qint64：long long int 或(__int64)
qintptr：qint32 或 qint64
qlonglong： long long int 或(__int64)
qptrdiff： qint32 或 qint64
qreal：double 或 float
quint8：unsigned char
quint16：unsigned short.
quint32：unsigned int
quint64：unsigned long long int 或 (unsigned __int64)
quintptr： quint32 或 quint64
qulonglong： unsigned long long int 或 (unsigned __int64).
uchar：unsigned char
uint：unsigned int
ulong：unsigned long
ushort：unsigned short
http://blog.csdn.net/x356982611/article/details/50762931