FCL class hierarchy

EParserError
- EJSONParser Exception class for JSON parsing errors
- EScannerError JSON scanner exception
EStreamError
- EBlowFishError Exception used to report errors.
- EIDEAError Exception for IDEA Stream errors.
- EIOStreamError Error thrown in case of an invalid operation on a TIOStream.
- ENullStreamError Exception for erroneous seeks.
- EPipeError Exception raised when an invalid operation is performed on a pipe stream.
  - EPipeCreation Exception raised when an error occurred during the creation of a pipe pair.
  - EPipeSeek Exception raised when an invalid seek operation is attempted on a pipe.
- Ezliberror Base exception for exceptions in the ZStream unit.
  - Ecompressionerror Errors in the TCompressionStream class are signaled with this exception.
  - Edecompressionerror Errors in the TDeCompressionStream class are signaled with this exception.
  - Egzfileerror Exception class used in Tgzfilestream class.
Exception
- EBase64DecodingException Exception raised on errors.
- ECacheError Exception class used in the cachecls unit.
- ECGIException Exception raised by TEZcgi.
- ECollectionError Exception class for collection errors
- EDaemon Exception used in all daemon application code.
- EDatabaseError Base class for all database-related errors.
  - ESQLDatabaseError SQL database error class.
    - EIBDatabaseError Firebird/Interbase database error.
    - EMSSQLDatabaseError Sybase/MS SQL Server specific error.
  - EUpdateError Error raised when updating data during a post operation.
- EDictionaryError Exception class for dictionary errors
- EDuplicate Exception raised when a key is stored twice in a hash table.
- EExprParser Expression parser exception class
- EExprScanner Exception class for scanner errors
- EHTTP HTTP exception class
  - EFPHTTPError Exception for HTTP processing errors
    - EFpWebError Exception class for web application errors
  - EFPWebError Exception class for web-related errors
  - EHTTPClient Exception class for HTTP client errors
    - EHTTPClientSocket Exception class for HTTP client socket errors
      - EHTTPClientSocketRead Exception class for HTTP client socket read errors
      - EHTTPClientSocketWrite Exception class for HTTP client socket write errors
  - EHTTPRoute HTTP routing exception class
- EICPException Exception class for IPC-related errors
- EIniCol Exception used for error reporting.
- EInstallerError Exception class for installer errors
- EIPCError Error reporting exception.
- EJSON JSON exception.
  - EJSONToPascal Exception class for JSON to Pascal conversion errors
  - EJSONWriter Exception class for JSON writing errors
- EKeyNotFound Exception raised when a key is not found.
- ELogError Exception raised on errors in the TEventLog component.
- EMediator Exception class for mediator-related errors
- EMOFileError Exception raised in case of an error.
- EProcess Exception raised when an error occurs in a TProcess routine.
- ESingleInstance Exception raised in case of errors.
- EStreamColl Exception raised when an error occurs when streaming the collection.
- ESyncObjectException Exception object used in unit syncobjs.
  - ELockException Locking error exception.
  - ELockRecursionException Lock recursion exception.
- ETemplateParser Exception for template parser errors.
- EVersionInfo Exception class for version information errors
- EZipError Exception raised for errors in TZipper and TUnZipper.
- MDSError Exception raised for errors when reading or writing an in-memory dataset.
HTTPError
- EWebSessionError Exception for session-related errors
TASCII85RingBuffer
TAVLTree
TAVLTreeNode
TAVLTreeNodeEnumerator
TBaseAVLTreeNodeManager
- TAVLTreeNodeMemManager TAVLTreeNode Node memory manager.
TBaseJSONEnumerator
TBinaryObjectReader
- TBidirBinaryObjectReader Binary component stream reader with BiDi support.
TBinaryObjectWriter
- TBidirBinaryObjectWriter Binary component stream writer with BiDi support.
TCache
TCollection
- TCheckConstraints Set of record-level constraints.
- TConditionalStrings Collection of conditional string values
  - TConditionalDestStrings Collection of conditional destination strings
  - TDependencies Collection of build dependencies
  - TResourceFiles Collection of resource files for the build system
- TCookies Collection of HTTP cookies
- TCustomWebActions Collection of web actions
  - TFPWebActions Collection of web actions with advanced functionality
- TDaemonDefs Collection of daemon definitions.
- TDependencies Dependencies collection for a daemon.
- TFPExprIdentifierDefs Collection class for expression identifier definitions
- THTTPRouteList Collection of HTTP routes
- TIniCollection Collection which can write itself to an .ini file.
  - TNamedIniCollection Collection of named collection items.
- TMediatorDefs Collection of mediator definitions for the manager
- TMediatorFieldInfoList Collection of field information for columnar list displays
- TMimeItems Collection of MIME multipart items
  - TStreamingMimeItems Collection for streaming MIME multipart items
- TModuleFactory Factory for managing HTTP modules
- TNamedCollection Collection class for managing named items
  - TCommands Collection of commands to execute during build
  - TPackages Collection of packages
  - TPackageVariants Collection of package variants
  - TSources Collection of source files
  - TTargets Collection class for managing build targets
- TNotifyEventCollection Collection of notification event handlers
- TParams A collection of parameter values for SQL-based datasets.
  - TSQLDBParams TParams descendant with room to store engine-specific data.
- TPropertyMap Collection of property mapping items
- TRequestInterceptorList Collection of request interceptors
- TSqlObjectIdentifierList
- TStreamCollection Collection with stream support.
- TTemplateVars Collection of template variables
- TUploadedFiles Collection of uploaded files
- TZipFileEntries Collection used to store information about files and directories in the .zip archive.
  - TFullZipFileEntries Collection of TFullZipFileEntry items.
TCollectionEnumerator
- TCommandEnumerator Enumerator for iterating through commands
- TDependencyEnumerator Enumerator for iterating through dependency collections
- TNotifyEventEnumerator Enumerator for iterating through notification events
- TPackageEnumerator Enumerator for iterating through package collections
- TPackageVariantEnumerator Enumerator for iterating through package variants
- TSourceEnumerator Enumerator for iterating through source collections
- TTargetEnumerator Enumerator for iterating through build targets
TCollectionItem
- TCheckConstraint Record-level constraint definition.
- TConditionalString String value with CPU and OS conditions
  - TConditionalDestString Conditional string with destination path
  - TDependency Represents a build dependency in the fpmake system
  - TResourceFile Represents a resource file in the build system
- TCookie HTTP cookie implementation
- TCustomWebAction Base class for web actions
  - TFPWebAction Web action with content and template support
- TDaemonDef Daemon definition.
- TDependency Container to define dependencies on other services.
- TFPExprIdentifierDef Class for defining identifiers in expressions
  - TFPBuiltInExprIdentifierDef Class for built-in expression identifier definitions
- THTTPRoute Base HTTP route class
  - THTTPRouteCallback Route with callback procedure handler
  - THTTPRouteCallbackEx Route with extended callback handler
  - THTTPRouteEvent Route with object event handler
  - THTTPRouteInterface Route with interface-based handler
  - THTTPRouteObject Route with object class handler
- TIniCollectionItem Collection item with support for loading/saving from/to ini file.
  - TNamedIniCollectionItem TIniCollectionItem with a name property.
- TMediatorDef Definition for registering mediators with the mediator manager
- TMediatorFieldInfo Describes a column in columnar list display mediators
- TMimeItem Represents a MIME multipart item
- TModuleItem Container for module registration information
- TNamedItem Base class for items with a name property
  - TCommand Represents a command to be executed during build
  - TFieldDef Class to describe one field in a record in a dataset.
    - TSQLDBFieldDef TFieldDef descendant with room to store engine-specific data.
  - TIndexDef Index definition.
  - TPackage Central class for package management and building
  - TPackageVariant Package variant with specific build options
  - TSource Represents a source file in the build system
  - TTarget Build target representation in the fpmake system
- TNamedItem Named collection item.
  - TCommand Represents a command to be executed during build
  - TFieldDef Class to describe one field in a record in a dataset.
    - TSQLDBFieldDef TFieldDef descendant with room to store engine-specific data.
  - TIndexDef Index definition.
  - TPackage Central class for package management and building
  - TPackageVariant Package variant with specific build options
  - TSource Represents a source file in the build system
  - TTarget Build target representation in the fpmake system
- TNotifyEventItem Individual notification event item with callback handlers
- TParam Parameter description class.
  - TSQLDBParam TParam descendent used in SQLDB.
- TPropertyMapItem Collection item representing a single property mapping
- TRequestInterceptorItem Single request interceptor definition
- TSqlObjectIdenfier SQL Identifier properties object.
- TStreamCollectionItem Collection item with streaming support.
- TTemplateVar Template variable with name and value
- TUploadedFile Represents an uploaded file in an HTTP request
- TZipFileEntry Represents a file or directory added to a .ZIP file.
  - TFullZipFileEntry Extended zip file entry.
TComponent
- TBaseMediator Base class for mediating data between model and view objects
  - TBaseListMediator Base mediator for handling lists of observable objects
    - TColumnsListMediator List mediator supporting multiple columns with field configuration
  - TComponentMediator General-purpose mediator for any TComponent-based view
- TBaseSingleInstance Abstract class for single application instance.
  - TAdvancedSingleInstance Single Application instance class using file communication.
- TBuildEngine Main build engine for compiling and installing packages
- TCustomApplication Ancestor class for TApplication classes.
  - TCustomDaemonApplication Custom daemon application class.
    - TDaemonApplication Default descendent of CustomDaemonApplication.
  - TCustomWebApplication Base class for web applications with integrated request handling
- TCustomConnection Abstract class for connections to a server.
  - TDatabase Base class for connecting a FreePascal application to an external Database engine.
    - TSQLConnection An abstract class representing a connection to a SQL Database.
      - TIBConnection TIBConnection: Firebird/Interbase specific .
      - TMSSQLConnection Microsoft SQL Server database connector.
        TSybaseConnection Sybase ASE database connector.
      - TSQLConnector Universal connection component.
- TCustomDaemonMapper Daemon mapper.
  - TDaemonMapper Daemon mapper for designing in IDE.
- TCustomInstaller Base class for package installers
  - TBasicInstaller Basic installer implementation
  - TFPCInstaller Free Pascal Compiler specific installer implementation
- TCustomSession Base class for HTTP session management
- TCustomSQLStatement Object to execute SQL statements without result set.
  - TSQLStatement Class to execute non-select SQL statements.
- TDaemonController Internal daemon controller class.
- TDataSet Base class for records-based data-access.
  - TDBDataset Dataset connected to a database.
    - TCustomBufDataset Ancestor class for a database-aware buffered dataset.
      - TBufDataset Implements a database-aware buffered dataset.
      - TCustomSQLQuery Custom Class to handle SQL commands (with or without result set).
        TSQLQuery Class to handle SQL commands (with or without result set).
  - TMemDataset Implements an in-memory dataset.
- TDataSource Component representing the link between a local (GUI) component and a dataset.
- TDBTransaction Encapsulate a transaction.
  - TSQLTransaction Transaction in which a TSQLQuery is handled.
- TDictionary String substitution dictionary for variables and functions
  - TPackageDictionary Package-specific dictionary with master dictionary support
- TEventLog Event logging class.
- TExprBuiltInManager Class for managing built-in functions and variables in expressions
- TField Provide access to the contents of a single field in a record.
  - TBinaryField Field class for working with binary field data.
    - TBytesField Field class for fixed size byte array values.
      - TVarBytesField Field class for variable size byte array values.
  - TBlobField Base class for BLOB field data.
    - TGraphicField Field class for graphical BLOB field data.
    - TMemoField Base class for MEMO (text BLOB) field data.
    - TWideMemoField Field class for wide MEMO (widestring text BLOB) field data.
  - TBooleanField Boolean field class type.
  - TDateTimeField Field class for date/time/Datetime values.
    - TDateField Field class for date values.
    - TTimeField Field class for time values.
  - TNumericField Base class for all numerical data field classes.
    - TBCDField Field class for Binary Coded Decimal (BCD) values.
    - TExtendedField
    - TFloatField Class for floating point values.
      - TCurrencyField Class for currency fields.
    - TFMTBCDField Fixed precision floating point data field.
    - TLargeintField Field class for 64-bit signed integer data.
    - TLongintField Field class for 32-bit signed integer data.
      - TAutoIncField Field for auto-incremental, 32-bit signed integer data.
      - TByteField Field class for 8-bit unsigned integer data.
      - TIntegerField Alias for TLongintField.
      - TShortintField Field class for 8-bit signed integer data.
      - TSmallintField Field class for smallint (16-bit signed integer) data.
      - TWordField Field class for word (16-bit unsigned integer) data.
    - TLongWordField Field class for 32-bit unsigned integer data.
    - TSingleField
  - TObjectField
    - TArrayField
  - TStringField Field class to handle ansistring fields.
    - TGuidField Field class for native variant data.
    - TWideStringField Field class for widestring data.
  - TVariantField Field class for native variant data.
- TFileVersionInfo High-level component for accessing file version information
- TFPCustomHTTPClient Base HTTP client class for making HTTP requests
  - TFPHTTPClient Full-featured HTTP client with published properties
- TFPCustomTimer Custom timer class.
  - TFPTimer Timer class with published properties.
- TFPExpressionParser Class for parsing and evaluating mathematical expressions
- TFPMimeTypes Class to manage list of mime type mappings.
- THTTPContentProducer Base class for HTTP content production
- THTTPRouter HTTP request router class
- TIPCBase Base class for IPC client and server functionality
  - TIPCClient IPC client for sending requests and receiving responses
  - TIPCServer IPC server for receiving requests and sending responses
- TJSONApplier Component class for applying (merging) JSON objects
- TJSONToPascal Main class for generating Pascal code from JSON data
- TPascalCodeGenerator Pascal code generator class
- TProcess Class to start and control other processes.
- TSessionFactory Factory for managing user sessions
- TSimpleIPC Ancestor for client/server simple IPC classes.
  - TSimpleIPCClient Simple IPC client component.
  - TSimpleIPCServer Simple IPC server component.
- TWebHandler Base class for handling HTTP requests in web applications
TCustomIniFile
- TIniFile Ini file implementation.
  - TMemIniFile Inifile cached in memory.
- TJSONIniFile Ini file implementation using JSON storage format
TCustomSQLscript
- TSQLScript Component to execute various SQL statements.
TDataModule
- TCustomDaemon Base daemon application class.
  - TDaemon Daemon class for visual development.
- TCustomHTTPModule Base class for HTTP modules
  - TSessionHTTPModule HTTP module with session support
    - TCustomFPWebModule Base class for web modules with action and template support
      - TFPWebModule Complete web module with published properties
TDataSetEnumerator
TFieldsEnumerator
TFileStream
- TBufferedFileStream Implements a buffered file stream with a multi-page buffer.
TFormattingWriter
- THTMLWriter HTML implementation of formatting writer
- TMarkdownWriter Markdown output writer with native Markdown formatting
- TTextWriter Plain text output writer with line wrapping and formatting support
  - TStreamWriter
  - TStringWriter
- TTexWriter LaTeX implementation of formatting writer
TFPHashObject
TFPList
- TNamedItemList List class for managing named items
TfpmPlugin
- TfpmPluginManager Manager for FPMake plugin system
- TfpmResolvePackagePathsPlugin Plugin for resolving package file paths
THandleStream
- TInputPipeStream TStream descendent which wraps the read end of a pipe.
- TIOStream Stream which handles standard input/output and stderr.
- TNullStream Empty data stream.
- TOutputPipeStream TStream descendent which wraps the write end of a pipe.
- TReleaseHandleStream Handle stream that releases file handle on destruction
TIniFileKey
TIniFileSection
TInterfacedObject
- TGuardian
TInterlocked
TIPCServerMsg
TIPCServerMsgQueue
TJSONScanner
TJSONToYaml
TList
- TClassList List of classes.
- TIniFileKeyList Key list object.
- TIniFileSectionList Section objects list.
- TObjectList List to manage object instances.
  - TComponentList List to manage component instances.
TMOFile
TNonFreePooledMemManager
TObject
- TAbstractJSONWriter Abstract base class for JSON writers
  - TJSONDataWriter JSON writer that builds TJSONData tree in memory
  - TJSONStreamWriter JSON writer that writes directly to a stream
- TBaseJSONReader Abstract base class for JSON readers
  - TJSONConsumerReader JSON reader that uses an IJSONConsumer for processing
  - TJSONEventReader Event-based JSON reader that fires events for JSON elements
  - TJSONParser JSON parser implementation class
- TBlowFish Class implementing Blowfish encryption/decryption.
- TBufIndex Defines the interface used to implement indexes in TBufDataset.
  - TArrayBufIndex Implements an index using an array of record buffers.
  - TDoubleLinkedBufIndex Implements an index using a doubly-linked list.
  - TUniDirectionalBufIndex Implements a uni-directional index.
- TCompressor Compressor object.
  - TDeflater Child of TCompressor that implements the Deflate compression method.
  - TShrinker Child of TCompressor that implements the Shrink compression method.
- TCustomBucketList Custom bucket list class.
  - TBucketList Default bucket list implementation.
    - TObjectBucketList Bucket list using objects instead of pointers.
- TCustomHTTPEventSource Base class for Server-Sent Events (SSE) client
  - THTTPEventSource Default Server-Sent Events source implementation
- TDataPacketHandler
  - TFpcBinaryDatapacketHandler
- TDeCompressor Decompressor object.
  - TInflater Child of TDeCompressor that implements the Inflate decompression method.
- TEZcgi Easy CGI class.
- TFields Collection of instances.
- TFPCustomHashTable Hash class.
  - TFPDataHashTable Hash table for data pointers.
  - TFPObjectHashTable Hash table for object instances.
  - TFPStringHashTable Hash table for string data.
- TFPExpressionScanner Class for tokenizing expression strings into parser tokens
- TFPExprNode Class for representing nodes in expression trees
  - TCaseOperation Internally used class for case-when conditional operations
  - TFPBinaryOperation Internally used class for binary operations with left and right operands
    - TFPBooleanOperation Internally used class for boolean operations in expressions
      - TFPBinaryAndOperation Internally used class for binary AND logical operation
      - TFPBinaryOrOperation Internally used class for binary OR logical operation
      - TFPBinaryXOrOperation Internally used class for binary XOR logical operation
    - TFPBooleanResultOperation Internally used class for operations that result in boolean values
      - TFPEqualOperation Internally used class for equality comparison operations
        TFPUnequalOperation Internally used class for inequality comparison operations
      - TFPOrderingOperation Internally used class for ordering comparison operations
        TFPGreaterThanOperation Internally used class for greater-than comparison operations
        TFPLessThanEqualOperation Internally used class for less-than-or-equal comparison operations
        TFPLessThanOperation Internally used class for less-than comparison operations
        TFPGreaterThanEqualOperation Internally used class for greater-than-or-equal comparison operations
    - TIfOperation Internally used class for conditional if-then-else operations
    - TMathOperation Internally used class for mathematical operations in expressions
      - TFPAddOperation Internally used class for addition operations
      - TFPDivideOperation Internally used class for division operations
      - TFPModuloOperation Internally used class for modulo operations
      - TFPMultiplyOperation Internally used class for multiplication operations
      - TFPPowerOperation Internally used class for power/exponentiation operations
      - TFPSubtractOperation Internally used class for subtraction operations
  - TFPConstExpression Internally used class for constant value expressions
  - TFPExprIdentifierNode Internally used class for identifier nodes in expression trees
    - TFPExprFunction Internally used class for representing function calls in expression trees
      - TAggregateExpr Internally used Base class for aggregate expressions
        TAggregateCount Internally used class for count aggregate functions
        TAggregateMax Internally used class for maximum aggregate functions
        TAggregateMin Internally used class for minimum aggregate functions
        TAggregateSum Internally used class for sum aggregate functions
        TAggregateAvg Internally used class for average aggregate functions
      - TFPFunctionCallBack Internally used class for callback-based function expressions
      - TFPFunctionEventHandler Internally used class for event-based function expressions
    - TFPExprVariable Internally used class for variable expression nodes
  - TFPUnaryOperator Internally used class for unary operations with single operand
    - TFPConvertNode Internally used class for type conversion operations
      - TCurrencyToDateTimeNode Internally used class for converting currency to datetime
      - TCurrencyToFloatNode Internally used class for converting currency to float
      - TFloatToCurrencyNode Internally used class for converting float to currency
      - TFloatToDateTimeNode Internally used class for converting float to datetime
      - TIntConvertNode Internally used class for integer conversion operations
        TIntToCurrencyNode Internally used class for converting integer to currency
        TIntToDateTimeNode Internally used class for converting integer to datetime
        TIntToFloatNode Internally used class for converting integer to float
    - TFPNegateOperation Internally used class for numeric negation operations
    - TFPNotNode Internally used class for logical NOT operations
- TFPHashList Hash list class for pointer data.
- TFPHashObjectList
- TFPObjectList TFPList descendent which manages objects.
- TFPTimerDriver Abstract driver class.
- TFunctionItem Dictionary item containing a function callback
- THTCustomNode Single item in the hash table.
  - THTDataNode Data node for pointer hashtable.
  - THTObjectNode Node type for TFPObjectHashTable.
    - THTOwnedObjectNode Node type for owned objects.
  - THTStringNode Node type for TFPStringHashTable.
- THTTPHeader Base class for HTTP header management
  - TRequest HTTP request representation
  - TResponse HTTP response representation
- TIPCClientComm Internal client-side communication protocol.
- TIPCServerComm Internal message communication component.
- TJSONComparer Class for comparing JSON data structures
- TJSONData Base (abstract) object for all JSON based data types.
  - TJSONArray Class of TJSONArray.
  - TJSONBoolean Class to represent boolean JSON data.
  - TJSONNull Class to represent boolean JSON data.
  - TJSONNumber Common ancestor for the numerical value JSON classes.
    - TJSONFloatNumber Class to represent floating-point JSON data.
    - TJSONInt64Number Class to represent 64-bit integer JSON data.
    - TJSONIntegerNumber Class to represent 32-bit integer JSON data.
    - TJSONQWordNumber Class to represent 64-bit unsigned integer JSON data.
  - TJSONObject Class of TJSONObject.
  - TJSONString Class to represent string JSON data.
- TListItemMediator Mediator for individual items within list mediators
  - TColumnsListItemMediator List item mediator with multi-column support
- TLookupList Class to manage lookup list values.
- TMaskUtils Class to manipulate and work with edit masks.
- TMediatorManager Central manager for registering and finding mediator definitions
- TMimeType Helper class to store a mime type and its associated extensions.
- TObservedHook Observer pattern helper class implementing IFPObserved interface
- TOrderedList Base class for queues and stacks.
  - TQueue Pointer queue.
    - TObjectQueue
  - TStack Pointer Stack.
    - TObjectStack Object instances stack.
- TPropInfoList Class for keeping property information.
- TPropsStorage Property storage mechanism.
- TRouteObject Base class for route handler objects
- TSQLHandle Internal object representing a database internal handle.
  - TIBTrans Firebird/Interbase transaction.
  - TSQLCursor Internal object representing a database result set.
    - TIBCursor Firebird/Interbase cursor.
- TSynchroObject Abstract synchronization object.
  - TCountdownEvent
  - TCriticalSection Critical section.
  - THandleObject Class encapsulating an operating system handle.
    - TEventObject Event propagation object.
      - TSimpleEvent Simple, anonymous event.
    - TMutex
    - TSemaphore
- TTemplateParser A class to parse templates.
- TTextReader Text reader class.
  - TFileReader Implement TTextReader for files.
  - TStreamReader Implement TTextReader for streams.
  - TStringReader Implement TTextReader for a single string.
- TUnZipper Extracts and decompresses files and directories in a .ZIP archive file.
- TValueItem Dictionary item containing a value
- TZipper Creates a .ZIP archive file.
TOwnedCollection
- TDefCollection Definition collection.
  - TFieldDefs Collection of TFieldDef instances.
    - TSQLDBFieldDefs TFieldDefs descendant with room to store engine-specific data.
  - TIndexDefs A class to keep a list of index definitions.
    - TServerIndexDefs SQLDB specific descendant of the TIndexDefs.
TOwnerStream
- TASCII85DecoderStream ASCII 85 decoder stream.
- TASCII85EncoderStream ASCII 85 encoding stream.
- TBase64DecodingStream Base64 Decoding stream.
  - TBase64URLDecodingStream
- TBase64EncodingStream Base64 encoding stream.
  - TBase64URLEncodingStream
- TBlowFishStream Parent class for Blowfish encryption/decryption streams.
  - TBlowFishDeCryptStream On-the-fly Blowfish decryption stream.
  - TBlowFishEncryptStream On-the-fly Blowfish encryption stream.
- TBufStream Common ancestor for buffered streams.
  - TReadBufStream Read-only buffered stream.
  - TWriteBufStream Write-only buffered stream.
- Tcustomzlibstream Ancestor for compression and decompression classes.
  - Tcompressionstream Write-only stream class which compresses data written to it.
  - Tdecompressionstream Reads and decompresses data from a compressed data stream.
- TIDEAStream Ancestor stream for IDEA encryption/decryption streams.
  - TIDEADeCryptStream IDEA Decryption stream.
  - TIDEAEncryptStream IDEA encryption stream.
- TWindowedStream Provide a window on another stream.
TParamsEnumerator
TPersistent
- TConnectionDef Connection type definition class.
  - TIBConnectionDef Describes class.
  - TMSSQLConnectionDef Connection definition for TSQLConnector.
    - TSybaseConnectionDef Connection definition for TSQLConnector.
- TCORSSupport Cross-Origin Resource Sharing support
- TCSVHandler Base class for CSV reading and writing classes.
  - TCSVBuilder Class to write a CSV file.
  - TCSVDocument Class representing a CSV document in memory.
  - TCSVParser Class to parse a CSV file.
- TCustomDefaults Base class for build system default configurations
  - TBasicDefaults Basic default configuration class
  - TFPCDefaults FPC-specific default configuration class
- TDataLink Data event handling agent for controls.
  - TDetailDataLink Represents the link between a detail data source and a master datasource.
    - TMasterDataLink Datalink for Master-Detail relationships between datasets.
      - TMasterParamsDataLink Class to establish a master-detail relationship between dataset, based on parameters.
- TFPCustomTemplate Base class for templates.
  - TFPTemplate Template component.
- TFPVersion Represents a Free Pascal version number
- TIODescriptor
- TProxyData Proxy server configuration data
- TSQLSequence Support for applying sequences to fields.
- TWinBindings Windows Daemon bindings (windows only).
TPooledMemManager
TReader
- TDelphiReader Stream reader with BiDi Support.
TStream
- TBufBlobStream Implements a Blob Stream for TBufDataset.
- TGZFileStream Stream to read/write from a gzip file.
- TGZipCompressionStream
- TGZipDecompressionStream
TStringHash
TStringList
- THashedStringList String list with support for hash values.
TTarArchive
TTarWriter
TTextWriter
- TStreamWriter
- TStringWriter
TThread
- TCompileWorkerThread Worker thread for compilation operations
- TDaemonThread Thread to run daemons in.
TVersionInfo
TWriter
- TDelphiWriter Stream writer with BiDi Support.

An experiment, built from development snapshots. Not the official Free Pascal or Lazarus documentation.