The library collecting the ROOT classes dedicated to data input and output.

For an overview of I/O in ROOT, see the following pages in the ROOT manual:

ROOT files
Trees: ROOT's columnar storage
I/O concepts: a collection of more advanced I/O-related topics
I/O of custom classes: how to read and write user-defined C++ objects

For ROOT I/O developers, a detailed internal description of the ROOT files layout is also available.

Classes
class	ROOT::Internal::RRawFile
	The RRawFile provides read-only access to local and remote files. More...

class	ROOT::Internal::RRawFileUnix
	The RRawFileUnix class uses POSIX calls to read from a mounted file system. More...

class	ROOT::Internal::RRawFileWin
	The RRawFileWin class uses portable C I/O calls to read from a drive. More...

class	TArchiveFile
	Class describing an archive file containing multiple sub-files, like a ZIP or TAR archive. More...

class	TBufferFile
	The concrete implementation of TBuffer for writing/reading to/from a ROOT file or socket. More...

class	TBufferIO
	Direct subclass of TBuffer, implements common methods for TBufferFile and TBufferText classes. More...

class	TBufferJSON
	Class for serializing object to and from JavaScript Object Notation (JSON) format. More...

class	ROOT::TBufferMerger
	TBufferMerger is a class to facilitate writing data in parallel from multiple threads, while writing to a single output file. More...

class	ROOT::TBufferMergerFile
	A TBufferMergerFile is similar to a TMemFile, but when data is written to it, it is appended to the TBufferMerger queue. More...

class	TBufferSQL2
	Converts data to SQL statements or read data from SQL tables. More...

class	TBufferText
	Base class for text-based streamers like TBufferJSON or TBufferXML Special actions list will use methods, introduced in this class. More...

class	TBufferXML
	Class for serializing/deserializing object to/from xml. More...

class	TCollectionClassStreamer
	Class streamer object to implement TClassStreamer functionality for I/O emulation. More...

class	TCollectionMemberStreamer
	Class streamer object to implement TMemberStreamer functionality for I/O emulation. More...

class	TCollectionStreamer
	Class streamer object to implement TClassStreamer functionality for I/O emulation. More...

class	TStreamerInfoActions::TConfiguration
	Base class of the Configurations. More...

class	TConvertClonesArrayToProxy
	Small helper to read a TBuffer containing a TClonesArray into any valid collection. More...

class	TDCacheFile
	A TDCacheFile is like a normal TFile except that it may read and write its data via a dCache server (for more on the dCache daemon see http://www-dcache.desy.de/. More...

class	TDirectoryFile
	A ROOT file is structured in Directories (like a file system). More...

class	TDomParser
	DOM stands for the Document Object Model; this is an API for accessing XML or HTML structured documents. More...

class	TEmulatedCollectionProxy
	Streamer around an arbitrary STL like container, which implements basic container functionality. More...

class	TEmulatedMapProxy
	Streamer around a map container. More...

class	TFile
	A ROOT file is composed of a header, followed by consecutive data records (`TKey` instances) with a well defined format. More...

class	TFileCacheRead
	A cache when reading files over the network. More...

class	TFileCacheWrite
	A cache when writing files over the network. More...

class	TFileMerger
	This class provides file copy and merging services. More...

class	TFileOpenHandle
	Class holding info about the file being opened. More...

class	TFilePrefetch
	The prefetching mechanism uses two classes (TFilePrefetch and TFPBlock) to prefetch in advance a block of tree entries. More...

class	TFPBlock
	This class represents the encapsulation of a block request. More...

class	TFree
	Service class for TFile. More...

class	TGenCollectionProxy
	Proxy around an arbitrary container, which implements basic functionality and iteration. More...

class	TGenMapProxy
	Localoptimization class. More...

class	TGenSetProxy
	Localoptimization class. More...

class	TGenVectorBoolProxy
	Local optimization class. More...

class	TGenVectorProxy
	Local optimization class. More...

class	TGFALFile
	Read and write data via the underlying Grid access mechanism. More...

class	TGFALSystem
	Directory handler for GFAL. More...

class	TKey
	Book space in a file, create I/O buffers, to fill them, (un)compress them. More...

class	TKeyMapFile
	Utility class for browsing TMapFile objects. More...

class	TKeySQL
	TKeySQL represents meta-information about object, which was written to SQL database. More...

class	TLockFile
	A scoped lock based on files. More...

class	TMapFile
	This class implements a shared memory region mapped to a file. More...

class	TMapRec
	Keep track of an object in the mapped file. More...

class	TMemFile
	A TMemFile is like a normal TFile except that it reads and writes only from memory. More...

class	TNetFile
	A TNetFile is like a normal TFile except that it reads and writes its data via a rootd server (for more on the rootd daemon see the source files in `root/rootd/src/`). More...

class	TS3WebFile
	A TS3WebFile is a TWebFile which retrieves the file contents from a web server implementing the REST API of the Amazon S3 protocol. More...

class	TSAXParser
	TSAXParser is a subclass of TXMLParser, it is a wraper class to libxml library. More...

class	TSQLClassInfo
	Contains information about tables specific to one class and version. More...

class	TSQLColumnData

class	TSQLFile
	Access an SQL db via the TFile interface. More...

class	TSQLObjectData
	TSQLObjectData is used in TBufferSQL2 class in reading procedure. More...

class	TSQLObjectDataPool
	XML object keeper class. More...

class	TSQLObjectInfo
	Info (classname, version) about object in database. More...

class	TSQLStructure
	This is hierarchical structure, which is created when data is written by TBufferSQL2. More...

class	TStreamerInfo
	Describes a persistent version of a class. More...

class	TVirtualArray
	Wrapper around an object and giving indirect access to its content even if the object is not of a class in the Cint/Reflex dictionary. More...

class	TVirtualCollectionIterators
	Small helper class to generically acquire and release iterators. More...

class	TVirtualCollectionPtrIterators

class	TVirtualObject
	Wrapper around an object and giving indirect access to its content even if the object is not of a class in the Cint/Reflex dictionary. More...

class	TXMLAttr
	TXMLAttribute is the attribute of an Element. More...

class	TXMLDocument
	TXMLDocument contains a pointer to an xmlDoc structure, after the parser returns a tree built during the document analysis. More...

class	TXMLNode
	TXMLNode contains a pointer to xmlNode, which is a node under the DOM tree. More...

class	TXMLParser
	TXMLParser is an abstract class which interfaces with Libxml2. More...

class	TXNetFile
	TXNetFile is an extension of TNetFile able to deal with new xrootd server. More...

class	TZIPFile
	Describes a ZIP archive file containing multiple sub-files. More...

class	TZIPMember
	A ZIP archive consists of files compressed with the popular ZLIB compression algorithm; this class records the information about a single archive member. More...

Classes