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Qt's Modules

Qt 4 consists of several modules, each of which lives in a separate library.

Modules for general software development:

QtCore	Core non-graphical classes used by other modules
QtGui	Graphical user interface (GUI) components
QtNetwork	Classes for network programming
QtOpenGL	OpenGL support classes
QtScript	Classes for evaluating Qt Scripts
QtScriptTools	Additional Qt Script components
QtSql	Classes for database integration using SQL
QtSvg	Classes for displaying the contents of SVG files
QtWebKit	Classes for displaying and editing Web content
QtXml	Classes for handling XML
QtXmlPatterns	An XQuery & XPath engine for XML and custom data models
Phonon	Multimedia framework classes
Qt3Support	Qt 3 compatibility classes

Modules for working with Qt's tools:

QtDesigner	Classes for extending Qt Designer
QtUiTools	Classes for handling Qt Designer forms in applications
QtHelp	Classes for online help
QtAssistant	Support for online help
QtTest	Tool classes for unit testing

The following extension modules are available in the Qt Commercial Editions on Windows:

QAxContainer	Extension for accessing ActiveX controls
QAxServer	Extension for writing ActiveX servers

The following extension module is available in all Qt Editions on Unix platforms:

QtDBus

Classes for Inter-Process Communication using the D-Bus

If you use qmake to build your projects, the QtCore and QtGui modules are included by default. To link only against QtCore, add the following line to your .pro file:

 QT -= gui

On Windows, if you do not use qmake, the Visual Studio Integration available to commercial licensees, or other build tools such as CMake, you also need to link against the qtmain library.