Qt Reference Documentation

# QtCore Module

The QtCore module contains core non-GUI functionality. More...

## Namespaces

Qt | Contains miscellaneous identifiers used throughout the Qt library
QtConcurrent | High-level APIs that make it possible to write multi-threaded programs without using low-level threading primitives

## Classes

QtConcurrent::Exception | Base class for exceptions that can transferred across threads
QAbstractAnimation | The base of all animations
QAbstractEventDispatcher | Interface to manage Qt's event queue
QAbstractFileEngine | Abstraction for accessing the filesystem
QAbstractFileEngineHandler | Way to register custom file engines with your application
QAbstractFileEngineIterator | Iterator interface for custom file engines
QAbstractItemModel | The abstract interface for item model classes
QAbstractListModel | Abstract model that can be subclassed to create one-dimensional list models
QAbstractState | The base class of states of a QStateMachine
QAbstractTableModel | Abstract model that can be subclassed to create table models
QAbstractTransition | The base class of transitions between QAbstractState objects
QAnimationGroup | Abstract base class for groups of animations
QAtomicInt | Platform-independent atomic operations on integers
QAtomicPointer | Template class that provides platform-independent atomic operations on pointers
QBasicTimer | Timer events for objects
QBitArray | Array of bits
QBuffer | QIODevice interface for a QByteArray
QByteArray | Array of bytes
QByteArrayMatcher | Holds a sequence of bytes that can be quickly matched in a byte array
QCache | Template class that provides a cache
QChar | 16-bit Unicode character
QChildEvent | Contains event parameters for child object events
QConstString | Wrapper for constant Unicode string data
QContiguousCache | Template class that provides a contiguous cache
QCoreApplication | Event loop for console Qt applications
QCryptographicHash | Way to generate cryptographic hashes
QCustomEvent | Support for custom events
QDataStream | Serialization of binary data to a QIODevice
QDate | Date functions
QDateTime | Date and time functions
QDebug | Output stream for debugging information
QDir | Access to directory structures and their contents
QDirIterator | Iterator for directory entrylists
QDynamicPropertyChangeEvent | Contains event parameters for dynamic property change events
QEasingCurve | Easing curves for controlling animation
QElapsedTimer | Fast way to calculate elapsed times
QEvent | The base class of all event classes. Event objects contain event parameters
QEventLoop | Means of entering and leaving an event loop
QEventTransition | QObject-specific transition for Qt events
QExplicitlySharedDataPointer | Represents a pointer to an explicitly shared object
QFSFileEngine | Implements Qt's default file engine
QFile | Interface for reading from and writing to files
QFileInfo | System-independent file information
QFileSystemWatcher | Interface for monitoring files and directories for modifications
QFinalState | Final state
QFlag | Helper data type for QFlags
QFlags | Type-safe way of storing OR-combinations of enum values
QFuture | Represents the result of an asynchronous computation
QFutureIterator | Java-style const iterator for QFuture
QFutureSynchronizer | Convenience class that simplifies QFuture synchronization
QFutureWatcher | Allows monitoring a QFuture using signals and slots
QGenericArgument | Internal helper class for marshalling arguments
QGenericReturnArgument | Internal helper class for marshalling arguments
QHash | Template class that provides a hash-table-based dictionary
QHashIterator | Java-style const iterator for QHash and QMultiHash
QHistoryState | Means of returning to a previously active substate
QIODevice | The base interface class of all I/O devices in Qt
QLatin1Char | 8-bit ASCII/Latin-1 character
QLatin1String | Thin wrapper around an US-ASCII/Latin-1 encoded string literal
QLibrary | Loads shared libraries at runtime
QLibraryInfo | Information about the Qt library
QLine | Two-dimensional vector using integer precision
QLineF | Two-dimensional vector using floating point precision
QLinkedList | Template class that provides linked lists
QLinkedListIterator | Java-style const iterator for QLinkedList
QList | Template class that provides lists
QListIterator | Java-style const iterator for QList and QQueue
QLocale | Converts between numbers and their string representations in various languages
QMap | Template class that provides a skip-list-based dictionary
QMapIterator | Java-style const iterator for QMap and QMultiMap
QMargins | Defines the four margins of a rectangle
QMetaClassInfo | Additional information about a class
QMetaEnum | Meta-data about an enumerator
QMetaMethod | Meta-data about a member function
QMetaObject | Contains meta-information about Qt objects
QMetaProperty | Meta-data about a property
QMetaType | Manages named types in the meta-object system
QMimeData | Container for data that records information about its MIME type
QModelIndex | Used to locate data in a data model
QMultiHash | Convenience QHash subclass that provides multi-valued hashes
QMultiMap | Convenience QMap subclass that provides multi-valued maps
QMutableHashIterator | Java-style non-const iterator for QHash and QMultiHash
QMutableLinkedListIterator | Java-style non-const iterator for QLinkedList
QMutableListIterator | Java-style non-const iterator for QList and QQueue
QMutableMapIterator | Java-style non-const iterator for QMap and QMultiMap
QMutableSetIterator | Java-style non-const iterator for QSet
QMutableVectorIterator | Java-style non-const iterator for QVector and QStack
QMutex | Access serialization between threads
QMutexLocker | Convenience class that simplifies locking and unlocking mutexes
QObject | The base class of all Qt objects
QObjectCleanupHandler | Watches the lifetime of multiple QObjects
QPair | Template class that stores a pair of items
QParallelAnimationGroup | Parallel group of animations
QPauseAnimation | Pause for QSequentialAnimationGroup
QPersistentModelIndex | Used to locate data in a data model
QPluginLoader | Loads a plugin at run-time
QPoint | Defines a point in the plane using integer precision
QPointF | Defines a point in the plane using floating point precision
QPointer | Template class that provides guarded pointers to QObject
QProcess | Used to start external programs and to communicate with them
QProcessEnvironment | Holds the environment variables that can be passed to a program
QPropertyAnimation | Animates Qt properties
QQueue | Generic container that provides a queue
QReadLocker | Convenience class that simplifies locking and unlocking read-write locks for read access
QReadWriteLock | Read-write locking
QRect | Defines a rectangle in the plane using integer precision
QRectF | Defines a rectangle in the plane using floating point precision
QRegExp | Pattern matching using regular expressions
QResource | Interface for reading directly from resources
QRunnable | The base class for all runnable objects
QScopedArrayPointer | Stores a pointer to a dynamically allocated array of objects, and deletes it upon destruction
QScopedPointer | Stores a pointer to a dynamically allocated object, and deletes it upon destruction
QSemaphore | General counting semaphore
QSequentialAnimationGroup | Sequential group of animations
QSet | Template class that provides a hash-table-based set
QSetIterator | Java-style const iterator for QSet
QSettings | Persistent platform-independent application settings
QSharedData | Base class for shared data objects
QSharedDataPointer | Represents a pointer to an implicitly shared object
QSharedMemory | Access to a shared memory segment
QSharedPointer | Holds a strong reference to a shared pointer
QSignalMapper | Bundles signals from identifiable senders
QSignalTransition | Transition based on a Qt signal
QSize | Defines the size of a two-dimensional object using integer point precision
QSizeF | Defines the size of a two-dimensional object using floating point precision
QSocketNotifier | Support for monitoring activity on a file descriptor
QStack | Template class that provides a stack
QState | General-purpose state for QStateMachine
QStateMachine | Hierarchical finite state machine
QString | Unicode character string
QStringList | List of strings
QStringMatcher | Holds a sequence of characters that can be quickly matched in a Unicode string
QStringRef | Thin wrapper around QString substrings
QSysInfo | Information about the system
QSystemLocale | Can be used to finetune the system locale of the user
QSystemSemaphore | General counting system semaphore
QTemporaryFile | I/O device that operates on temporary files
QTextBoundaryFinder | Way of finding Unicode text boundaries in a string
QTextCodec | Conversions between text encodings
QTextCodecPlugin | Abstract base for custom QTextCodec plugins
QTextDecoder | State-based decoder
QTextEncoder | State-based encoder
QTextIStream | Convenience class for input streams
QTextOStream | Convenience class for output streams
QTextStream | Convenient interface for reading and writing text
QThread | Platform-independent threads
QThreadPool | Manages a collection of QThreads
QThreadStorage | Per-thread data storage
QTime | Clock time functions
QTimeLine | Timeline for controlling animations
QTimer | Repetitive and single-shot timers
QTimerEvent | Contains parameters that describe a timer event
QTranslator | Internationalization support for text output
QUrl | Convenient interface for working with URLs
QUuid | Stores a Universally Unique Identifier (UUID)
QVarLengthArray | Low-level variable-length array
QVariant | Acts like a union for the most common Qt data types
QVariantAnimation | Abstract base class for animations
QVector | Template class that provides a dynamic array
QVectorIterator | Java-style const iterator for QVector and QStack
QWaitCondition | Condition variable for synchronizing threads
QWeakPointer | Holds a weak reference to a shared pointer
QWriteLocker | Convenience class that simplifies locking and unlocking read-write locks for write access
QXmlStreamAttribute | Represents a single XML attribute
QXmlStreamAttributes | Represents a vector of QXmlStreamAttribute
QXmlStreamEntityDeclaration | Represents a DTD entity declaration
QXmlStreamEntityResolver | Entity resolver for a QXmlStreamReader
QXmlStreamNamespaceDeclaration | Represents a namespace declaration
QXmlStreamNotationDeclaration | Represents a DTD notation declaration
QXmlStreamReader | Fast parser for reading well-formed XML via a simple streaming API
QXmlStreamWriter | XML writer with a simple streaming API
QtConcurrent::UnhandledException | Represents an unhandled exception in a worker thread

## Detailed Description

All other Qt modules rely on this module. To include the definitions of the module's classes, use the following directive:

     #include <QtCore>