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Try to create a component with a TStrings property

Posted on 2002-03-23
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Last Modified: 2010-04-05
I try to create a comonent
When i put the component on a form and click on nstring I get an Abstract Error.


unit Str;
interface
uses
  Windows, Messages, SysUtils, Classes, StdCtrls;
type
  TStr = class(TComponent)
  private
  protected
    astring : TStrings;
  public
    constructor Create(AOwner: TComponent);  override;
    destructor Destroy; override;
  published
    property nstring: TStrings READ astring WrITE astring;
  end;

procedure Register;

implementation

procedure Register;
begin
  RegisterComponents('Samples', [TStr]);
end;

constructor TStr.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
  astring := TStrings.Create;
end;

destructor TStr.Destroy;
begin
 inherited Destroy;
end;

end.
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Question by:delpro
1 Comment
 
LVL 9

Accepted Solution

by:
ITugay earned 200 total points
ID: 6890631
Hi delpro,


1. Do not use TStrings.Create, use TStringList.Create instead.

astring := TStringList.Create;

2. property nstring: TStrings READ astring WrITE astring;

should be changed to

property nstring: TStrings READ astring  write SetAstring;

procedure TStr.SetAString(Value: TStrings);
begin
  astring.Text := Value.Text;
  // or astring.Assign(Value);
end;

-----
Igor.
0

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