Classes unit

The Classes unit is part of the Free Pascal standard Runtime Library and contains abstract classes that form the basis for derived classes, and also implements a number of general purpose concrete classes including:

Classes Defined

• TAbstractObjectReader
  • TBinaryObjectReader
• TAbstractObjectWriter
  • TBinaryObjectWriter
  • TTextObjectWriter
• TBits
• TFiler
  • TReader
  • TWriter
• TFPList (TFPListEnumerator)
• TList - Manages a list of data type Pointer, can search and sort the list, and has an event notification feature. (TListEnumerator)
• TThread
• TThreadList
• TParser
• TPersistent
  • TCollection (TCollectionEnumerator)
    • TOwnedCollection
  • TCollectionItem
  • TComponent
    • TBasicAction
    • TDataModule
  • TInterfacedPersistent
  • TStrings
    • TStringList
• TRecall
• TStream
  • TCustomMemoryStream
    • TMemoryStream
      • TBytesStream
    • TResourceStream
  • THandleStream
    • TFileStream
  • TOwnerStream
  • TProxyStream
  • TStringStream

Exception Classes Defined

• EStreamError - Exception raised when an error occurs during read or write operations on a stream.
  • EFCreateError - Exception raised when an error occurred during creation of a TFileStream stream.
  • EFOpenError - Exception raised when an error occurred during creation of a TFileStream.
  • EFilerError - Exception raised by the component streaming system if an error occurs.
    • EReadError - Exception raised if an error occurs while reading from a stream.
    • EWriteError - Exception raised when an error occurs during writing to a stream.
    • EClassNotFound - Exception raised when an unknown class is referenced in a streamed component.
    • EInvalidImage - Exception raised when the resource header needed for streaming of a component is invalid.
• EResNotFound - Exception raised when a resource, needed to initialize a component, is not found.
• EListError (ifndef FPC_TESTGENERICS) - Exception raised when an error occurs in lists handling.
• EBitsError - Exception raised when an error occurs in a method of TBits.
• EStringListError - Exception raised when an error occurs in a method of TStrings.
• EComponentError - Exception raised when an error occurs in the component registration routines.
• EParserError - Exception raised when an error occurs during the parsing of streams.
• EOutOfResources - Exception raised when the system is out of resources.

See also

• classes unit doc