Delphi 实现软件自动升级的功能
原理简单，在FTP上维护一个Update.ini文件，里面记录着要更新文件的版本号，本地也有一个Update.ini文件，每次启动更新程序时，先从FTP上下载Update.ini文件到本地名字为Update_new.ini，然后比较这两个文件，如果新的版本号大于旧的，或者新的文件在就ini中没有，这些就表示要更新的文件，然后逐一下载。
本程序名字为AutoUpdate，你生成这个exe，然后和主程序一起打包，创建桌面快捷方式时，指向AutoUpdate，而不是主程序。
在本地还有一个ini文件，比如叫ftp.ini吧，里面内容是
[coninfo]
main=Project1.exe
param={app}sayyes.pj2 -y bde.txt
main=Project1.exe：是主程序名称，和升级程序在同一目录
param={app}sayyes.pj2 -y bde.txt：这是命令行参数，app为当前路径，在程序中替换掉，传递给主程序（如果需要的话）
update.ini的内容格式如下
[root]
办事处查询.txt=20100519
[dbcard]
sayyes.pj2=20100519
FTP用户密码.txt=20100519
[root]代表根目录，后面的[dbcard]代表子目录，依次类推
unit Main; interface uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls, IdHTTP, IdBaseComponent, IdComponent, IdTCPConnection, IdTCPClient, IdFTP, ComCtrls, ExtCtrls,IniFiles,ShellAPI, jpeg; type TfrmMain = class(TForm) IdFTP1: TIdFTP; IdHTTP1: TIdHTTP; ProgressBar1: TProgressBar; GroupBox1: TGroupBox; ld_host: TLabeledEdit; ld_username: TLabeledEdit; ld_psw: TLabeledEdit; ld_port: TLabeledEdit; Label1: TLabel; cb_mode: TComboBox; ProgressBar2: TProgressBar; Label3: TLabel; list_file: TListView; Label4: TLabel; procedure IdFTP1Work(Sender: TObject; AWorkMode: TWorkMode; const AWorkCount: Integer); procedure IdFTP1WorkEnd(Sender: TObject; AWorkMode: TWorkMode); procedure FormCreate(Sender: TObject); private { Private declarations } FSize:Integer; FPath: string; FExePath: string; FInitPath: string; FIniFile:TIniFile; FHandle:HWND; FMainExe:string; FParam: string; procedure CheckUpdateList; function ConnectFTP:Boolean; procedure DownLoadFile; procedure LoadIni; procedure SaveIni; public { Public declarations } end; var frmMain: TfrmMain; implementation uses Flash; {$R *.dfm} //下载进度 procedure TfrmMain.IdFTP1Work(Sender: TObject; AWorkMode: TWorkMode; const AWorkCount: Integer); begin ProgressBar1.Position := AWorkCount; Application.ProcessMessages; end; procedure TfrmMain.IdFTP1WorkEnd(Sender: TObject; AWorkMode: TWorkMode); begin ProgressBar1.Position := 0; ProgressBar2.StepBy(1); end; procedure TfrmMain.FormCreate(Sender: TObject); var frm: TfrmFlash; begin Self.Visible := False; //闪屏，可以不加 frm := TfrmFlash.Create(nil); frm.Show; Application.ProcessMessages; FExePath := ExtractFilePath(Application.ExeName); FIniFile := TIniFile.Create(FExePath+'ftp.ini'); //加载ini信息，就是主机和端口之类的信息 LoadIni; try ConnectFTP; CheckUpdateList; Self.Visible := True; Application.ProcessMessages; DownLoadFile; finally FreeAndNil(frm); IdFTP1.Quit; FParam := StringReplace(FParam,'{app}',FExePath,[rfReplaceAll]); //更新完毕后，启动主程序，并传入命令行参数 ShellExecute(Handle,'open',PChar(FExePath+FMainExe),PChar(FParam),nil,SW_NORMAL); Application.Terminate; end; end; //检查更新列表 procedure TfrmMain.CheckUpdateList; var oldFile,newFile:TStringList; i,ver,index:Integer; itemstr,itempath: string; item:TListItem; begin oldFile := TStringList.Create; newFile := TStringList.Create; try list_file.Clear; //先下载服务器上的update.ini文件，存到本地update_new.ini IdFTP1.Get('update.ini',FExePath+'update_new.ini',True); if FileExists(FExePath + 'update.ini') = False then Exit; oldFile.LoadFromFile(FExePath + 'update.ini'); newFile.LoadFromFile(FExePath + 'update_new.ini'); itempath := ''; //下面开始比较两个list，如果newFile的版本号大于oldFile的版本号或者oldFile中没有的都表示要更新的 for i := 0 to newFile.Count - 1 do begin itemstr := newFile.Strings[i]; if itemstr = '' then Continue; if itemstr[1] = '[' then begin itempath := Copy(itemstr,2,Length(itemstr)-2); //如果是根目录 if itempath = 'root' then itempath := '/'; Continue; end; itemstr := newFile.Names[i]; index := oldFile.IndexOfName(itemstr); if index = - 1 then begin item := list_file.Items.Add; item.Caption := itemstr; item.SubItems.Add(itempath) end else begin ver := StrToIntDef(newFile.Values[itemstr],0); if ver > StrToIntDef(oldFile.Values[itemstr],0) then begin item := list_file.Items.Add; item.Caption := itemstr; item.SubItems.Add(itempath); end; end; end; if list_file.Items.Count = 0 then Application.Terminate; finally oldFile.Free; newFile.Free; end; end; function TfrmMain.ConnectFTP: Boolean; begin Result := False; try IdFTP1.Host := ld_host.Text; IdFTP1.Port := StrToIntDef(ld_port.Text,21); IdFTP1.Username := ld_username.Text; IdFTP1.Password := ld_psw.Text; IdFTP1.Connect; IdFTP1.Passive := cb_mode.ItemIndex = 1; FInitPath := IdFTP1.RetrieveCurrentDir; Result := IdFTP1.Connected; except Result := False; end; end; //下载文件更新 procedure TfrmMain.DownLoadFile; var i:Integer; path:string; s1,s2:String; begin ProgressBar2.Max := list_file.Items.Count; ProgressBar2.Position := 0; FIniFile.EraseSection('error'); for i := 0 to list_file.Items.Count - 1 do begin Label4.Caption := '正在下载 '+list_file.Items[i].Caption; Application.ProcessMessages; IdFTP1.ChangeDir(FInitPath); path := list_file.Items[i].SubItems.Strings[0]; if path <>'/' then begin IdFTP1.ChangeDir(path); ForceDirectories(FExePath+path); s1 := list_file.Items[i].Caption; s2 := FExePath+path+'/'+list_file.Items[i].Caption; IdFTP1.Get(s1,s2,True); end else begin s1 := list_file.Items[i].Caption; s2 := FExePath+'/'+list_file.Items[i].Caption; IdFTP1.Get(s1,s2,True); //记录失败项 FIniFile.WriteString('error',list_file.Items[i].Caption,'成功'); end; except //记录失败项 FIniFile.WriteString('error',list_file.Items[i].Caption,'失败'); end; end; Label4.Caption := '所有文件更新完毕！'; DeleteFile(FExePath+'update.ini'); CopyFile(PChar(FExePath+'update_new.ini'),PChar(FExePath+'update.ini'),False); end; procedure TfrmMain.LoadIni; begin ld_host.Text := FIniFile.ReadString('coninfo','host','******'); ld_username.Text := FIniFile.ReadString('coninfo','user','******'); ld_psw.Text := FIniFile.ReadString('coninfo','psw','******'); ld_port.Text := FIniFile.ReadString('coninfo','port','21'); cb_mode.ItemIndex := FIniFile.ReadInteger('coninfo','mode',1); FMainExe := FIniFile.ReadString('coninfo','main','Main.exe'); FParam := FIniFile.ReadString('coninfo','param',''); end; procedure TfrmMain.SaveIni; begin FIniFile.WriteString('coninfo','host',ld_host.Text); FIniFile.WriteString('coninfo','user',ld_username.Text); FIniFile.WriteString('coninfo','psw',ld_psw.Text); FIniFile.WriteString('coninfo','port',ld_port.Text); FIniFile.WriteInteger('coninfo','mode',cb_mode.ItemIndex); end; end. 如有疑问请留言或者到本站社区交流讨论，感谢阅读，希望能帮助到大家，谢谢大家对本站的支持！