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
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QClipboard | Access to the window system clipboard
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QDataStream | Serialization of binary data to a QIODevice
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QDir | Access to directory structures and their contents in a platform-independent way
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QDns | Static functions for host name lookups
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QDnsHostInfo | Information about a host name lookup
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QFile | I/O device that operates on files
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QFileEngine | Abstraction for accessing the filesystem
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QFileEngineHandler | Allows custom QFileEngines to be plugged into Qt
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QFileInfo | System-independent file information
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QFtp | Implementation of the FTP protocol
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QHostAddress | IP address
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QHttp | Implementation of the HTTP protocol
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QHttpHeader | Header information for HTTP
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QHttpRequestHeader | Request header information for HTTP
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QHttpResponseHeader | Response header information for HTTP
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QIODevice | The base class of I/O devices
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QIOEngine | Abstraction for block reading and writing
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QImageIO | Parameters for loading and saving images
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QLock | Wrapper for a System V shared semaphore
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QMacMime | Maps open-standard MIME to Mac flavors
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QMetaResource | Used to create QResource's from supplied data
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QMimeSource | Abstraction of objects which provide formatted data of a certain MIME type
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QPictureIO | Parameters for loading and saving pictures
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QProcess | Used to start external programs and to communicate with them
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QResource | Access to application resource data
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QServerSocket | TCP-based server
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QSettings | Persistent platform-independent application settings
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QSignal | Can be used to send signals for classes that do not inherit QObject
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QSignalMapper | Bundles signals from identifiable senders
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QSocket | Buffered TCP connection
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QSocketDevice | Platform-independent low-level socket API
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QSocketNotifier | Support for socket callbacks
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QTextIStream | Convenience class for input streams
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QTextOStream | Convenience class for output streams
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QTextStream | Functions for reading and writing text using a QIODevice
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QUrl | Convenient interface for working with URLs
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QUrlInfo | Stores information about URLs
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QWindowsMime | Maps open-standard MIME to Window Clipboard formats
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