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uses
  XMLIntf, IniFiles, Registry, SJConfigUtils, ...;

type
  TAppConfig = class(TAppConfigManager)
  protected
    procedure LoadFromStream(Data: TStream); override;
    procedure SaveToXml(Ini: IXMLDocument); override;
    procedure LoadFromINI(Ini: TCustomIniFile); override;
    procedure LoadFromRegistry(Reg: TRegistry; ParentPath: String); override;

    procedure SaveToStream(Data: TStream); override;
    procedure LoadFromXml(Ini: IXMLDocument); override;
    procedure SaveToINI(Ini: TCustomIniFile); override;
    procedure SaveToRegistry(Reg: TRegistry; ParentPath: String); override;

    procedure RunConfigWizard; override;
    procedure ApplyStandardSettings; override;
    procedure GetProgramInfo(var Author, ProductName, ProductVersion: string); override;
  end;

implementation

uses
  ConfigWizard;

{ TAppConfig }

// Allgemeine Aufgaben

procedure TAppConfig.RunConfigWizard;
begin
  frmConfigWizard := TfrmConfigWizard.Create(nil);
  frmConfigWizard.ShowModal(Self);
end;

procedure TAppConfig.ApplyStandardSettings;
begin
  fUserName := 'Standardname'; 
end;

procedure TAppConfig.GetProgramInfo(var Author, ProductName,
  ProductVersion: string);
begin
  Author := 'Sebastian Jänicke';
  ProductName := 'SJ Config Utils Demo';
  ProductVersion := '1.0';
end;

...                    

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procedure TAppConfig.LoadFromXml(Ini: IXMLDocument);
begin
  if AccessManager.InitReadLocation('Userinfo', sIniSectionOpenError) then
  begin
    fUserName := AccessManager.ReadString('Username', sIniValueNotFound);
  end;
end;

...                    

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var
  i: Integer;
begin
  for i := 0 to ConfigGroupBoxItems.Count - 1 do
    rgSettingsLocation.Items.Add(ConfigGroupBoxItemNames[ConfigGroupBoxItems[i]]);
  ...