Delphi Dosya Boyutunu Bulma

procedure TForm1.Button1Click(Sender: TObject);
var
srFileSR: TSearchRec;
sFileName, sFileSize: string;
begin
sFileName := 'c:\test\2.avi';
FindFirst(sFileName,faAnyFile,srFileSR);
sFileSize := IntToStr(srFileSR.Size);
Showmessage(sFileSize);
end;