procedure TfrmAutoUpdate.btnDownloadClick(Sender: TObject);
var
Source, Dest: string;
errCount: Integer;
procedure _down;
begin
Source := urlPath + cdsServer.FieldByName('filename').Text;
Dest := appPath + cdsServer.FieldByName('filename').Text;
if not DownloadFile(Source, Dest) then
begin
Inc(errCount);
ShowMessage(cdsServer.FieldByName('filename').Text + '下载失败');
end;
end;
begin
errCount := 0;
// 下载服务端的update.ini
Source := urlPath + 'update.ini';
Dest := appPath + 'update2.ini';
if DownloadFile(Source, Dest) then // 下载update.ini 成功
begin
// 生成服务端文件版本情况列表
CreateServerVer;
if FileExists(appPath + 'update.ini') then // 本地有update.ini
begin
// 生成本地文件版本情况列表
CreateLocalVer;
// 比对文件版本号决定哪些需要下载
bar.Max := cdsServer.RecordCount;
cdsServer.First;
while not cdsServer.Eof do
begin
if not cdsLocal.FindKey([cdsServer.FieldByName('filename').Text]) then
// 新文件要下载
begin
_down;
end
else
begin
if cdsServer.FieldByName('ver').AsInteger > // 版本号低的旧文件要下载
cdsLocal.FieldByName('ver').AsInteger then
begin
_down;
end;
end;
cdsServer.Next;
bar.Position := bar.Position +1;
bar.Update;
end;
end
else
begin // 本地无update.ini 下载所有文件
bar.Max := cdsServer.RecordCount;
cdsServer.First;
while not cdsServer.Eof do
begin
_down;
cdsServer.Next;
bar.Position := bar.Position +1;
bar.Update;
end;
end;
// 更新本地update.ini
CopyFile(PChar(appPath + 'update2.ini'),
PChar(appPath + 'update.ini'), False);
DeleteFile(appPath + 'update2.ini');
end
else
begin // 从服务器下载update.ini 失败
ShowMessage('下载update.ini失败');
Exit;
end;
if errCount = 0 then begin
ShowMessage('更新程序成功');
end else
ShowMessage('更新程序程序失败');
end;
procedure TfrmAutoUpdate.CreateLocalVer;
var
ini: TIniFile;
i: integer;
begin
ini := TIniFile.Create(appPath + 'update.ini');
try
FList.Clear;
ini.ReadSectionValues('ver', FList);
for i := 0 to FList.Count - 1 do
begin
cdsLocal.Append;
cdsLocal.FieldByName('filename').Text :=
Copy(FList[i], 1, pos('=', FList[i]) - 1);
cdsLocal.FieldByName('ver').Text :=
Copy(FList[i], pos('=', FList[i]) + 1,
length(FList[i]));
cdsLocal.Post;
end;
finally
ini.Free;
end;
end;
procedure TfrmAutoUpdate.CreateServerVer;
var
ini: TIniFile;
i: integer;
begin
ini := TIniFile.Create(appPath + 'update2.ini');
try
FList.Clear;
ini.ReadSectionValues('ver', FList);
for i := 0 to FList.Count-1 do
begin
cdsServer.Append;
cdsServer.FieldByName('filename').Text :=
Copy(FList[i], 1, pos('=', FList[i]) - 1);
cdsServer.FieldByName('ver').Text :=
Copy(FList[i], pos('=', FList[i]) + 1,
length(FList[i]));
cdsServer.Post;
end;
finally
ini.Free;
end;
end;
function TfrmAutoUpdate.DownloadFile(Source, Dest: string): Boolean;
begin
try
DeleteUrlCacheEntry(PChar(Source)); // 先要清空缓存
Result := UrlDownloadToFile(nil, PChar(Source), PChar(Dest), 0, nil) = 0;
except
Result := False;
end;
end;
procedure TfrmAutoUpdate.FormClose(Sender: TObject; var Action: TCloseAction);
begin
Action := caFree;
frmAutoUpdate:=nil;
end;
procedure TfrmAutoUpdate.FormCreate(Sender: TObject);
begin
FList :=TStringList.Create;
end;
procedure TfrmAutoUpdate.FormDestroy(Sender: TObject);
begin
FreeAndNil(FList);
end;
procedure TfrmAutoUpdate.FormShow(Sender: TObject);
var
ini: TIniFile;
begin
appPath := ExtractFilePath(Application.ExeName);
// 升级文件的url path
ini := TIniFile.Create(appPath + 'config.ini');
try
urlPath := ini.ReadString('appServer', 'update', '');
finally
ini.Free;
end;
InitCdsLocal;
InitCdsServer;
end;
procedure TfrmAutoUpdate.InitCdsLocal;
begin
if not cdsLocal.Active then
cdsLocal.CreateDataSet
else
cdsLocal.EmptyDataSet;
end;
procedure TfrmAutoUpdate.InitCdsServer;
begin
if not cdsServer.Active then
cdsServer.CreateDataSet
else
cdsServer.EmptyDataSet;
end;