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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 | 
| Copyright © 2006 Trolltech | Trademarks | Qt 4.1.3  |