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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.
| 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 |
| QDns | Static functions for host name lookups |
| QDnsHostInfo | Information about a host name lookup |
| QFile | I/O device that operates on files |
| QFileEngine | Abstraction for accessing the filesystem |
| QFileEngineHandler | Allows custom QFileEngines to be plugged into Qt |
| 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 |
| QIODevice | The base interface class of all I/O devices in Qt |
| QImageIO | Parameters for loading and saving images |
| QLock | Wrapper for a System V shared semaphore |
| QMacMime | Maps open-standard MIME to Mac flavors |
| QMetaResource | Used to create QResource's from supplied data |
| QPictureIO | Parameters for loading and saving pictures |
| QProcess | Used to start external programs and to communicate with them |
| QResource | Access to application resource data |
| QSettings | Persistent platform-independent application settings |
| QSignal | Can be used to send signals for classes that do not inherit QObject |
| QSignalMapper | Bundles signals from identifiable senders |
| QSocketLayer | Low level access to a socket |
| QSocketNotifier | Support for socket callbacks |
| 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 | Functions for reading and writing text using a QIODevice |
| 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 © 2004 Trolltech | Trademarks | Qt 4.0.0-b1 |