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# 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
QAbstractSocket | The base functionality common to all socket types
QBuffer | QIODevice interface for a QByteArray
QClipboard | Access to the window system clipboard
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
QFtp | Implementation of the FTP protocol
QHostAddress | IP address
QHostInfo | Static functions for host name lookups
QHttp | Implementation of the HTTP protocol
QHttpHeader | Header information for HTTP
QHttpRequestHeader | Request header information for HTTP
QHttpResponseHeader | Response header information for HTTP
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
QMacMime | Maps open-standard MIME to Mac flavors
QNetworkProxy | Network layer proxy
QPictureIO | Parameters for loading and saving pictures
QProcess | Used to start external programs and to communicate with them
QSettings | Persistent platform-independent application settings
QSignalMapper | Bundles signals from identifiable senders
QSocketNotifier | Support for monitoring activity on a file descriptor
QTcpServer | TCP-based server
QTcpSocket | TCP socket
QTemporaryFile | I/O device that operates on temporary files
QTextIStream | Convenience class for input streams
QTextOStream | Convenience class for output streams
QTextStream | Convenient interface for reading and writing text
QUdpSocket | UDP socket
QUrl | Convenient interface for working with URLs
QUrlInfo | Stores information about URLs
QWindowsMime | Maps open-standard MIME to Window Clipboard formats