Delphi 实现软件自动升级的功能

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.