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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