Classes unit: what changed
Revision 0 to 1. Removed lines have a minus sign; added lines have a plus sign.
Title: Classes unit
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| 1 | + | The **Classes** unit is part of the Free Pascal standard [[RTL|Runtime Library]] and contains abstract classes that form the basis for derived classes, and also implements a number of general purpose concrete classes including: | |
| 2 | + | ||
| 3 | + | ## Classes Defined | |
| 4 | + | ||
| 5 | + | - [[TAbstractObjectReader]] | |
| 6 | + | - [[TBinaryObjectReader]] | |
| 7 | + | - [[TAbstractObjectWriter]] | |
| 8 | + | - [[TBinaryObjectWriter]] | |
| 9 | + | - [[TTextObjectWriter]] | |
| 10 | + | - [[TBits]] | |
| 11 | + | - [[TFiler]] | |
| 12 | + | - [[TReader]] | |
| 13 | + | - [[TWriter]] | |
| 14 | + | - [[TFPList]] ([[TFPListEnumerator]]) | |
| 15 | + | - [[TList]] - Manages a list of data type [[Pointer]], can search and sort the list, and has an event notification feature. ([[TListEnumerator]]) | |
| 16 | + | - [[TThread]] | |
| 17 | + | - [[TThreadList]] | |
| 18 | + | - [[TParser]] | |
| 19 | + | - [[TPersistent]] | |
| 20 | + | - [[TCollection]] ([[TCollectionEnumerator]]) | |
| 21 | + | - [[TOwnedCollection]] | |
| 22 | + | - [[TCollectionItem]] | |
| 23 | + | - [[TComponent]] | |
| 24 | + | - [[TBasicAction]] | |
| 25 | + | - [[TDataModule]] | |
| 26 | + | - [[TInterfacedPersistent]] | |
| 27 | + | - [[TStrings]] | |
| 28 | + | - [[TStringList]] | |
| 29 | + | - [[TRecall]] | |
| 30 | + | - [[TStream]] | |
| 31 | + | - [[TCustomMemoryStream]] | |
| 32 | + | - [[TMemoryStream]] | |
| 33 | + | - [[TBytesStream]] | |
| 34 | + | - [[TResourceStream]] | |
| 35 | + | - [[THandleStream]] | |
| 36 | + | - [[TFileStream]] | |
| 37 | + | - [[TOwnerStream]] | |
| 38 | + | - [[TProxyStream]] | |
| 39 | + | - [[TStringStream]] | |
| 40 | + | ||
| 41 | + | ## Exception Classes Defined | |
| 42 | + | ||
| 43 | + | - **EStreamError** - Exception raised when an error occurs during read or write operations on a stream. | |
| 44 | + | - **EFCreateError** - Exception raised when an error occurred during creation of a [[TFileStream]] stream. | |
| 45 | + | - **EFOpenError** - Exception raised when an error occurred during creation of a TFileStream. | |
| 46 | + | - **EFilerError** - Exception raised by the component streaming system if an error occurs. | |
| 47 | + | - **EReadError** - Exception raised if an error occurs while reading from a stream. | |
| 48 | + | - **EWriteError** - Exception raised when an error occurs during writing to a stream. | |
| 49 | + | - **EClassNotFound** - Exception raised when an unknown class is referenced in a streamed component. | |
| 50 | + | - **EInvalidImage** - Exception raised when the resource header needed for streaming of a component is invalid. | |
| 51 | + | - **EResNotFound** - Exception raised when a resource, needed to initialize a component, is not found. | |
| 52 | + | - **EListError** (ifndef FPC_TESTGENERICS) - Exception raised when an error occurs in lists handling. | |
| 53 | + | - **EBitsError** - Exception raised when an error occurs in a method of [[TBits]]. | |
| 54 | + | - **EStringListError** - Exception raised when an error occurs in a method of [[TStrings]]. | |
| 55 | + | - **EComponentError** - Exception raised when an error occurs in the component registration routines. | |
| 56 | + | - **EParserError** - Exception raised when an error occurs during the parsing of streams. | |
| 57 | + | - **EOutOfResources** - Exception raised when the system is out of resources. | |
| 58 | + | ||
| 59 | + | ## See also | |
| 60 | + | ||
| 61 | + | - [[doc:rtl/classes/|classes unit doc]] | |
| 62 | + | ||
| 63 | + | --- | |
| 64 | + | *From the Free Pascal wiki, page "Classes unit", as it stood on 2016-08-18 after a change by FPC user, out of the wiki's dump of 2024-05-26. Copyright stays with the author who wrote it, according to the old wiki's [[Licensing]] page. If you have concerns about this material, [message the admin](/wiki-contact).* | |
| 65 | + | Category: RTL |