delphi写的自动升级演示 多线程+http服务器下载更新

该演示可用于项目的自动更新服务，也可以对本地文件做有效性验证（防止文件被病毒破坏） 获取服务器最新版本返回的JSON数据格式如下： { "errcode": 0, "data": { "apkupload_id": "24", "vername": "1.0.1", "vercode": "2", "content": "", "autorun": "kprint_v50.exe", "sys": [ { "file_id": "4623", "folder": "", "filename": "CustomIPTransport210.bpl", "md5": "0d0e026d65b118e6cbc9c21e26fe1873", "filesize": "97152" }, { "file_id": "4624", "folder": "", "filename": "cxDataRS21.bpl", "md5": "66698aab48abf664024aeb76eb00cd5d", "filesize": "310272" } ], "user": [ { "file_id": "112", "folder": "", "filename": "auth.bpl", "md5": "03aca7fc081f42aeffb795b8fa9f27bf", "filesize": "36864" }, { "file_id": "113", "folder": "", "filename": "base.bpl", "md5": "9a7abe34a1fe00bd12e8cedaac9e8040", "filesize": "153600" }, { "file_id": "114", "folder": "", "filename": "db.bpl", "md5": "02a547ba341e03aa86bf28730a806c5f", "filesize": "62464" }, { "file_id": "115", "folder": "", "filename": "fr4.bpl", "md5": "a15201f643602b5543f90e667a997660", "filesize": "5632" }, { "file_id": "116", "folder": "", "filename": "kprint_v50.exe", "md5": "69422b21534ac78103aac550f16e1ff2", "filesize": "236032" } ] } } 该json主要是最新版本的文件信息，包括md5值， 获取到后对本地文件进行检查，如果存在不一致的文件，自动从云端下载最新的文件并覆盖； 下载过程采用线程方式，通过idhttp进行文件下载；