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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.

QBuffer | I/O device that operates on 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 in a platform-independent way
QDns | Asynchronous DNS lookups
QFile | I/O device that operates on files
QFileInfo | System-independent file information
QFtp | Implementation of the FTP protocol
QHostAddress | IP address
QHttp | Implementation of the HTTP protocol
QHttpHeader | Header information for HTTP
QHttpRequestHeader | Request header information for HTTP
QHttpResponseHeader | Response header information for HTTP
QImageIO | Parameters for loading and saving images
QIODevice | The base class of I/O devices
QLocalFs | Implementation of a QNetworkProtocol that works on the local file system
QLock | Wrapper for a System V shared semaphore
QMimeSource | Abstraction of objects which provide formatted data of a certain MIME type
QMimeSourceFactory | Extensible provider of mime-typed data
QNetworkOperation | Common operations for network protocols
QNetworkProtocol | Common API for network protocols
QProcess | Used to start external programs and to communicate with them
QServerSocket | TCP-based server
QSettings | Persistent platform-independent application settings
QSignal | Can be used to send signals for classes that don't inherit QObject
QSignalMapper | Bundles signals from identifiable senders
QSocket | Buffered TCP connection
QSocketDevice | Platform-independent low-level socket API
QSocketNotifier | Support for socket callbacks
QTextIStream | Convenience class for input streams
QTextOStream | Convenience class for output streams
QTextStream | Basic functions for reading and writing text using a QIODevice
QUrl | URL parser and simplifies working with URLs
QUrlInfo | Stores information about URLs
QUrlOperator | Common operations on URLs
QWindowsMime | Maps open-standard MIME to Window Clipboard formats