代替copyfile，效率会低，少用，并且不适合大文件。unitUnitCopy;interfaceusesWinapi.Windows,Winapi.Messages,System.SysUtils,System.Variants,System.Classes,Vcl.Graphics,Vcl.Controls,Vcl.Forms,Vcl.Dialogs,Vcl.StdCtrls,Vcl.Buttons,ActiveX,Comobj,ShlObj,