任何数据类型中 Rtti 中都有对应的获取信息的类, 有序类型对应的是 TRttiOrdinalType.
unit Unit1; interface uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls; type TForm1 = class(TForm) Memo1: TMemo; Button1: TButton; procedure Button1Click(Sender: TObject); end; var Form1: TForm1; implementation {$R *.dfm} uses Rtti; procedure TForm1.Button1Click(Sender: TObject); var t: TRttiOrdinalType; begin Memo1.Clear; //先从类型名获取类型信息对象 t := TRttiContext.Create.GetType(TypeInfo(Byte)) as TRttiOrdinalType; Memo1.Lines.Add(Format('%s - %s', [t.Name, t.QualifiedName])); Memo1.Lines.Add(Format('Size: %d', [t.TypeSize])); Memo1.Lines.Add('QualifiedName: ' + t.QualifiedName); Memo1.Lines.Add(Format('Min,Max: %d , %d', [t.MinValue, t.MaxValue])); Memo1.Lines.Add(EmptyStr); //空字串 //可以用 AsOrdinal 方法代替前面的 as TRttiOrdinalType t := TRttiContext.Create.GetType(TypeInfo(Word)).AsOrdinal; Memo1.Lines.Add(Format('%s: %s', [t.Name, t.QualifiedName])); Memo1.Lines.Add(Format('Size: %d', [t.TypeSize])); Memo1.Lines.Add(Format('Min,Max: %d , %d', [t.MinValue, t.MaxValue])); Memo1.Lines.Add(EmptyStr); //也可以直接强制转换 t := TRttiOrdinalType(TRttiContext.Create.GetType(TypeInfo(Integer))); Memo1.Lines.Add(Format('%s: %s', [t.Name, t.QualifiedName])); Memo1.Lines.Add(Format('Size: %d', [t.TypeSize])); Memo1.Lines.Add(Format('Min,Max: %d , %d', [t.MinValue, t.MaxValue])); Memo1.Lines.Add(EmptyStr); end; end.
