多线程文件下载器 显示在listbox里 轮询 从downloadlist.ini中获取要下载的文件，并且校验MD5，存储数据库，重复的不再下载-Multi-threaded file download device displayed in the listbox inside polling from downloadlist.ini get to download the file, and verify MD5, store databases, repeat no long

运用MD5检查文件完整性，能够产生MD5码，并且选择自动或者手动验证完整性。(Using MD5 to check file integrity, you can generate MD5 codes, and choose to verify integrity automatically or manually.)