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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