商品化的软件产品普遍需要提供在线升级功能,所谓在线升级首先必须要从Internet站点上下载文件,然后再对下载的文件做处理.由于网速和文件大小等方面的因素,在文件下载过程中显示下载进度指示可以使产品更赋有人性化-Commercialization of software products generally need to provide online upgrade feature, the so-called first-line upgrade must download files fr