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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.
| 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 | 
| QMacMime | Maps open-standard MIME to Mac flavors | 
| 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 | 
| Copyright © 2007 Trolltech | Trademarks | Qt 3.3.8 |