TFileStream複製文件

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    OpenDialog1: TOpenDialog;
    SaveDialog1: TSaveDialog;
    Button2: TButton;
    Button3: TButton;
    Label1: TLabel;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    { Private declarations }
    procedure copyfile(const FromFileName,ToFileName:string);
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
  from,tofile:string;

implementation

{$R *.dfm}
 procedure TForm1.copyfile(const FromFileName,ToFileName:string);
   var
     FromStream,ToStream:TFileStream;
    begin
      FromStream:=TFileStream.Create(FromFileName,fmOpenRead);
      ToStream:=TFileStream.Create(ToFileName,fmOpenWrite or fmCreate);
      ToStream.CopyFrom(FromStream,FromStream.size);
      ToStream.Free;
      FromStream.Free;
    end;
procedure TForm1.Button1Click(Sender: TObject);
begin
  if opendialog1.Execute then
  from:=opendialog1.FileName;
  label1.caption:=from;
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  if SaveDialog1.Execute then
  begin
    toFile:=Savedialog1.FileName+'.bmp';
    copyfile(from,Tofile);
  end;
end;

end.