3.2. The Qt Core Module

3.2. The Qt Core Module
	Chapter 3. Introduction to Qt

[ fromfile: qtcore.xml id: qtcore ]

Qt 4 is a library consisting of smaller libraries, or modules. The most popular ones are:

core, including QObject, QThread, QFile, and so forth
gui, all classes derived from QWidget plus some related classes
xml, for parsing and serializing XML
sql, for communicating with SQL databases
net, for communicating data between hosts on specific protocols (http, tcp, udp)

Except for core, these modules need to be “enabled” in qmake project files in order to be used. For example:

QT += xml  # to use the xml module
QT += gui  # to use QWidgets
QT += sql  # to use SQL module

The following section will introduce some of the core library classes.


3.1.1. Points of Departure		3.2.1. Streams and Dates