//接口与类型转换 type IFoot: interface ['|0000-0000-0000-0000|'] end; IBall = interface ['|0000-0000-0000-0001|'] end; TFootball = calss(TinterfacedObject,IFoot,IBall) end; implementation procedure Test(FB: TFootball) var F:IFoot begin F := FB;//合法,因为FB支持IFoot end; var FB: TFootball; F: IFoot; B: IBall; begin FB := TFootBall.Create; F := FB;//合法,因为FB支持IFoot B := F as IBall;//把F(IFoot)转为IBall end;
Delphi 接口(5)-接口与类型转换
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