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property in delphi

 
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MadDoom
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Joined: 27 Dec 2006
Posts: 38
PostPosted: Wed Jul 11, 2007 5:13 am    Post subject: property in delphi Reply with quote
ok, i know that i can add a new property to some class, but how i do it?
here is the code that i wrote:
Code:
unit Unit2;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TForm2 = class(TForm)
    Edit1: TEdit;
    procedure Edit1Change(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
type
   TCompass = class(TControl)
     private
        FHeading: string;
        procedure SetHeading(Value: string);
     published
        property Heading: string read FHeading write SetHeading;

    end;
var
  Form2: TForm2;

implementation

procedure TCompass.SetHeading(Value: string);
begin
            if FHeading <> Value then
             begin
               FHeading := value;
               Repaint;    // update user interface to reflect new value
             end;
end;
{$R *.dfm}

procedure TForm2.Edit1Change(Sender: TObject);
var s,l:TCompass;
begin
s.heading:='7';
edit1.Text:=s.fheading;
end;

end.

y cant i change the property?!?! Crying or Very sad
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Dark Byte
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Joined: 09 May 2003
Posts: 25814
Location: The netherlands
PostPosted: Wed Jul 11, 2007 5:21 am    Post subject: Reply with quote
TCompass is a class
You're forgetting to allocate (create) it
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