These classes deal with shared libraries, (e.g. .so and DLL files), and with Qt plugins.
See the plugins documentation.
See also the ActiveQt framework for Windows.
QGenericPlugin
Abstract base class for window-system related plugins in Qt QPA
QIconEnginePlugin
Abstract base for custom QIconEngine plugins
QImageIOPlugin
Defines an interface for writing an image format plugin
QLibrary
Loads shared libraries at runtime
QPluginLoader
Loads a plugin at run-time
QQmlExtensionPlugin
Abstract base for custom QML extension plugins
QScriptExtensionPlugin
Abstract base for custom QScript extension plugins
QSqlDriverPlugin
Abstract base for custom QSqlDriver plugins
QStylePlugin
Abstract base for custom QStyle plugins