How To Use Interfaces

Copy the text below and it will demonstrate how to use Interfaces to write less code, avoid code repetition,..., this is a fully working program.

{$mode objfpc}{$H+}{$interfaces com}
type
  ITestInterface = interface
    ['{3FB19775-F5FA-464C-B10C-D8137D742088}']
    procedure DoSomething;
    procedure DoItAll;
  end;

  TBaseObject = class(TInterfacedObject,ITestInterface)
    procedure DoSomething;
    procedure DoItAll;
  end;

  procedure TBaseObject.DoSomething;
  begin
    Writeln('TBaseObject DoSomething !');
  end;

  procedure TBaseObject.DoItAll;
  begin
    Writeln('TBaseObject DoItAll !');
  end;
var
  I: ITestInterface;
begin
  Writeln('Using regular interfaces');
  I := TBaseObject.Create as ITestInterface;
  if I <> nil then
    Writeln('Got interface OK. Calling it');
  I.DoSomething;
  I.DoItAll;
end.

See also

• Accessing the Interfaces directly
• Interfaces
• Understanding Interfaces