Определить и выставить значение текстового свойства

unit StrForm;

interface

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

type
  TForm1 = class(TForm)
    ButtonGet: TButton;
    EditProperty: TEdit;
    Label1: TLabel;
    Bevel1: TBevel;
    ButtonTrial: TButton;
    Label2: TLabel;
    LabelResult: TLabel;
    ButtonSet: TButton;
    Label3: TLabel;
    EditValue: TEdit;
    procedure ButtonGetClick(Sender: TObject);
    procedure ButtonSetClick(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

uses
  TypInfo;

procedure TForm1.ButtonGetClick(Sender: TObject);
var
  PropInfo: PPropInfo;
begin
  if not Assigned (ButtonTrial) then
    ShowMessage ('The button has been renamed')
  else
  begin
    PropInfo := GetPropInfo (
      ButtonTrial.ClassInfo, EditProperty.Text);
    if PropInfo <> nil then
      if PropInfo^.PropType^.Kind =
          tkLString then
        LabelResult.Caption :=
          GetStrProp (ButtonTrial, PropInfo)
      else
        ShowMessage ('Not a string property')
    else
      ShowMessage ('Property doesn''t exist');
  end;
end;

procedure TForm1.ButtonSetClick(Sender: TObject);
var
  PropInfo: PPropInfo;
begin
  if not Assigned (ButtonTrial) then
    ShowMessage ('The button has been renamed')
  else
  begin
    PropInfo := GetPropInfo (
      ButtonTrial.ClassInfo, EditProperty.Text);
    if PropInfo <> nil then
      if PropInfo^.PropType^.Kind =
          tkLString then
        SetStrProp (ButtonTrial, PropInfo, EditValue.Text)
      else
        ShowMessage ('Not a string property')
    else
      ShowMessage ('Property doesn''t exist');
  end;
end;

end.