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私はORMを作成するためにDelphi-TokyoでRTTIを勉強していますが、オブジェクトでもあるプロパティにアクセスするのに問題があります。以下のコードで、id
のProp
のキャストはどのように行うことができますか? TRttiProperty
インスタンス上オブジェクトのTRTTIPropertyのキャストを実行する方法
unit Unit1;
interface
uses
Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
Vcl.Controls, Vcl.Forms, Vcl.Dialogs, rtti, Vcl.StdCtrls;
type
TIntField = class(TObject)
private
fDisplayNme: string;
public
constructor Create(DisplayName: string);
published
property DisplayName: string read fDisplayNme write fDisplayNme;
end;
TSale = class(TObject)
private
fIdSale: TIntField;
public
constructor Create;
published
property IdSale: TIntField read fIdSale write fIdSale;
end;
TForm1 = class(TForm)
Button1: TButton;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
{ TIntField }
constructor TIntField.Create(DisplayName: string);
begin
fDisplayNme:= DisplayName;
end;
{ TSale }
constructor TSale.Create;
begin
fIdSale:= TIntField.Create('idSale');
end;
procedure TForm1.Button1Click(Sender: TObject);
var
Context: TRttiContext;
TypObj: TRttiType;
Prop: TRttiProperty;
sale: TSale;
id: TIntField;
begin
sale:= TSale.Create;
Context:= TRttiContext.Create;
TypObj:= Context.GetType(sale.ClassInfo);
prop:= TypObj.GetProperty('IdSale');
id:= Prop as TIntField; //Would you like to do this or something equivalent
ShowMessage(id.DisplayName);
end;
end.