2GB 이상 파일크기 구하는 함수

function FileSize(const AFileName: string): Int64;
var
  srData: TSearchRec;
  FileData: DWORD;
  SizeHigh, SizeLow: Integer;
  RetVal: array[0..7] of Byte;
begin  Result := -1;
{$IFDEF MSWINDOWS}
  FileData := FindFirst(AFileName, faReadOnly, srData);
  if FileData <> 0 then
    Exit;

  SizeHigh := srData.FindData.nFileSizeHigh;
  SizeLow  := srData.FindData.nFileSizeLow;
  ZeroMemory(@RetVal[0], SizeOf(RetVal));
  Move(SizeLow, RetVal[0], 4);
  Move(SizeHigh, RetVal[4], 4);
  Move(RetVal[0], Result, 8);
{$ENDIF}
end;