FCL/id
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Free Component Library (FCL) teridiri dari kumpulan unit yang menyediakan komponen (umumnya kelas) untuk tugas-tugas umum. Dimaksudkan agar kompatibel dengan Delphi's Visual Component Library (VCL), tetapi FCL terbatas hanya komponen non-visual. Di lain pihak, FCL melebihi VCL.
Lihat Free Component Library untuk status pengembangan saat ini dan tinjauan atas komponen yang tersedia (meskipun ini tidak konsisten dengan Reference for 'fcl' Lazarus). Anda juga dapat memeriksa repositori sumber. Catatan bahwa ada juga beberapa file spesifik-platform dalam FCL.
Setelah contoh, Anda dapat menemukan daftar beberapa komponen FCL.
Pemakaian
To use an FCL component you need to include its name in a uses clause of your program or unit (see example below). The default compiler configuration is set up to search the fcl directory for such units. You can also set the appropriate search path with a command-line compiler option of the form -Fu<path-to-fcl-units>.
Dokumentasi
Currently, the FCL is not documented (feel free to contribute; also take a look at Reference for 'fcl'). For Delphi compatible units, you could consult the Delphi documentation. You can always take a look at the source files in the source repository.
Contoh
The following program illustrates the use of the class TObjectList in the FCL unit Contnrs (providing various containers, including lists, stacks, and queues):
<delphi> program TObjectListExample;
uses Classes, { from RTL for TObject } Contnrs; { from FCL for TObjectList } type TMyObject = class(TObject) { just some application-specific class } private FName: String; { with a string field } public constructor Create(AName: String); { and a constructor to create it with a given name } property Name: String read FName; { and a property to read the name } end; constructor TMyObject.Create(AName: String); begin inherited Create; FName := AName; end; var VObjectList: TObjectList; { for a list of objects; it is a reference to such a list! } begin VObjectList := TObjectList.Create { create an empty list } with VObjectList do begin Add(TMyObject.Create('Thing One')); Writeln((Last as TMyObject).Name); Add(TMyObject.Create('Thing Two')); Writeln((Last as TMyObject).Name); end; end.</delphi>
This program must be compiled in an object-oriented mode, such as -Mobjfpc or -Mdelphi.
Komponen FCL
This is not an exhaustive list (to avoid duplication of effort). It only mentions some important components, or components that are otherwise not easy to find.
- Classes
- Base classes for Object Pascal extensions in Delphi mode
- Contnrs
- Some common container classes
- FPCUnit
- Unit testing framework (based on Kent Beck's unit testing framework, e.g. cf. JUnit), documenting article about FPCUnit
- XMLRead, XMLWrite and DOM
- Detailed at the XML Tutorial