QT5:先导篇 全局定义

一.简介

<QtGlobal>头文件包含了Qt类库的一些全局定义,包含基本数据类型 函数和宏

二.全局变量定义

<QtGlobal>定义的数据类型:

Qt数据类型                   定义                              字节数

qint8                           signed char                       1

qint16                         signed short                      2

qint32                         signed int                          4

qingt64                       long long int                      8

qlonglong                   long long int                      8

quint8                         unsigned char                  1

quint16                       unsigned short                 2

quint32                       unsigned int                     4

quint64                       unsigned long long int      8

qulonglong                 unsigned long long int      8

uchar                          unsigned char                  1

ushort                         unsigned short                 2

uint                             unsigned int                     4

ulong                          unsigned long                  8

qreal                           double                             8

qfloat16                                                              2

三.全局函数定义

四.全局宏定义