C++ API

The C++ API documentation is written for developers who develop the Qt Installer Framework. It describes the internal API, so there is no compatibility promise. Further, the documentation is a work in progress and therefore parts of it are missing while other parts might be out of date.

To create customized installers, use the Scripting API, instead. For more information, see Customizing Installers.

Namespaces

Namespace	Description
QInstaller	Contains classes to implement the core functionality of the Qt Installer Framework and the installer UI.
KDUpdater	Contains classes to automatically detect updates to applications, to retrieve them from external repositories, and to install them. KDUpdater classes are a fork of KDAB's general KDUpdater module.
Lib7z	Contains classes to create and extract archives.

QInstaller C++ Classes

QInstaller::AbstractArchive	The base class for classes representing different archive files. It cannot be instantiated on its own but defines the API and provides common functionality when subclassed
QInstaller::AbstractFileTask	The base class of file related tasks
QInstaller::AbstractOperationTracer	Pure virtual base class for classes tracing starting and finishing of installer operations
QInstaller::ArchiveEntry	Struct represents an entry in an archive file, which can be for example a file or a directory
QInstaller::ArchiveFactory	Used to create archive objects based on the suffix of a given filename
QInstaller::AspectRatioLabel	Label for displaying a pixmap that maintains its original aspect ratio when resized
QInstaller::BinaryContent	Handles binary information embedded into executables
QInstaller::BinaryFormatEngine	The default file engine for accessing resource collections and resource files
QInstaller::BinaryFormatEngineHandler	Way to register resource collections and resource files
QInstaller::BinaryLayout	Describes the binary content appended to a file
QInstaller::CacheableItem	Pure virtual class that defines an interface for a type suited for storage with the GenericDataCache class
QInstaller::Component	Represents the current component
QInstaller::Component::SortingPriorityGreaterThan	Sets a decreasing sorting priority for child components
QInstaller::Component::SortingPriorityLessThan	Sets an increasing sorting order for child components
QInstaller::ComponentModel	Holds a data model for visual representation of available components to install
QInstaller::ComponentSelectionPage	Changes the checked state of components
QInstaller::ComponentSortFilterProxyModel	Support for sorting and filtering data passed between another model and a view
QInstaller::ConcurrentOperationRunner	Can be used to perform installer operations concurrently
QInstaller::ConcurrentOperationTracer	Prints trace output for starting of asynchronous operations
QInstaller::DirectoryGuard	RAII class to create a directory and delete it on destruction unless released
QInstaller::FileGuard	Basic access serialization for file paths
QInstaller::FileGuardLocker	Locks a file path and releases it on destruction
QInstaller::FileTaskItem	Represents an item in a file task object
QInstaller::FileTaskResult	Represents the results of a file task
QInstaller::FinishedPage	Completes the installation wizard
QInstaller::GenericDataCache	Template class for a checksum based storage of items on disk
QInstaller::IntroductionPage	Displays information about the product to install
QInstaller::Lib7zArchive	Represents an archive file handled with the LZMA software development kit
QInstaller::LibArchiveArchive	Represents an archive file handled with libarchive archive and compression library
QInstaller::LibArchiveArchive::ArchiveData	Bundles a file device and associated read buffer for access as client data in libarchive callbacks
QInstaller::LibArchiveWrapper	Interface for interacting with archives handled using the libarchive archive and compression library
QInstaller::LicenseAgreementPage	Presents a license agreement to the end users for acceptance
QInstaller::LoggingHandler	Methods for manipulating the application-wide verbosiveness and format of printed debug messages
QInstaller::MessageBoxHandler	Modal dialog for informing the user or asking the user a question and receiving an answer
QInstaller::Metadata	Represents fetched metadata from a repository
QInstaller::MetadataCache	Class for a checksum based storage of Metadata objects on disk
QInstaller::OperationBlob	Textual representation of an operation that can be instantiated and executed by the Qt Installer Framework
QInstaller::OperationTracer	Prints trace output for starting of operations and automatically indicates finish on destruction
QInstaller::PackageManagerCore	The core functionality of the Qt Installer Framework
QInstaller::PackageManagerGui	The core functionality for non-interactive installations
QInstaller::PackageManagerPage	Displays information about the product to install
QInstaller::PackageSource	Specifies a single package source
QInstaller::PerformInstallationForm	Shows progress information about the installation state
QInstaller::PerformInstallationPage	Shows progress information about the installation state
QInstaller::ReadyForInstallationPage	Informs end users that the installation can begin
QInstaller::Resource	Interface for wrapping a file as read only device
QInstaller::ResourceCollection	Abstraction that groups together a number of resources
QInstaller::ResourceCollectionManager	Abstraction that groups together a number of resource collections
QInstaller::RestartPage	Enables restarting the installer
QInstaller::ScriptEngine	Used to prepare and run the component scripts
QInstaller::StartMenuDirectoryPage	Specifies the program group for the product in the Windows Start menu
QInstaller::SystemInfo	Provides information about the operating system
QInstaller::TargetDirectoryPage	Specifies the target directory for the installation

KDUpdater C++ Classes

GenericFactory	Implements a template-based generic factory
KDUpdater::FileDownloader	The base class for file downloaders used in KDUpdater
KDUpdater::FileDownloaderFactory	Acts as a factory for KDUpdater::FileDownloader
KDUpdater::FileDownloaderProxyFactory	Fine-grained proxy selection
KDUpdater::HttpDownloader	Used to download files over FTP, HTTP, or HTTPS
KDUpdater::LocalFileDownloader	Used to copy files from the local file system
KDUpdater::LocalPackage	Describes a single installed package in the application
KDUpdater::LocalPackageHub	Access to information about packages installed on the application side
KDUpdater::ResourceFileDownloader	Can be used to download resource files
KDUpdater::Task	The base class for all tasks in KDUpdater
KDUpdater::Update	Represents a single update
KDUpdater::UpdateFinder	UpdaterFinder class finds updates applicable for installed packages
KDUpdater::UpdateOperation	Abstract base class for update operations
KDUpdater::UpdateOperationFactory	Used to create update operations based on their name

Lib7z C++ Classes

Lib7z::ExtractCallback	Provides a callback for archive extraction
Lib7z::PercentPrinter	Displays the archiving process
Lib7z::SevenZipException	Class for lib7z exceptions

Scripting API Known Issues

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