Input/Output and Networking

These classes are used to handle input and output to and from external devices, processes, files etc. as well as manipulating files and directories.

QAbstractFileEngine	Abstraction for accessing the filesystem
QAbstractFileEngineHandler	Way to register custom file engines with your application
QBuffer	QIODevice interface for a QByteArray
QDataStream	Serialization of binary data to a QIODevice
QDir	Access to directory structures and their contents
QFile	Interface for reading from and writing to files
QFileInfo	System-independent file information
QFileSystemWatcher	Interface for monitoring files and directories for modifications
QIODevice	The base interface class of all I/O devices in Qt
QImageReader	Format independent interface for reading images from files or other devices
QImageWriter	Format independent interface for writing images to files or other devices
QProcess	Used to start external programs and to communicate with them
QProcessEnvironment	Holds the environment variables that can be passed to a program
QResource	Interface for reading directly from resources
QSettings	Persistent platform-independent application settings
QSocketNotifier	Support for monitoring activity on a file descriptor
QTemporaryFile	I/O device that operates on temporary files
QTextDocumentWriter	Format-independent interface for writing a QTextDocument to files or other devices
QTextStream	Convenient interface for reading and writing text
QUrl	Convenient interface for working with URLs
QUrlInfo	Stores information about URLs