Delphi 实现软件自动升级的功能

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.

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作者:lqh原文地址:http://blog.csdn.net/bdmh/article/details/6120459

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