{*********************************************************}
{*                 ONGUARD:  EXSELEC1.PAS                *}
{*        Copyright (c) TurboPower Software Co 1998      *}
{*                   All rights reserved.                *}
{*********************************************************}

  { This example uses the TOgUsageCode and the TOgSpecialCode
   components to implement a limited use "demo" application
   which allows only the required features.  The program can
   be run 3 times and then a special code must be obtained
   to register the program and to enable various features.
   A machine modifier is used to prevent the application from
   being copied and run on another machine.  To obtain the
   release code you need to run the companion example EXSLCODE.
   The release codes will be stored in a data file called
   EXSELECT.DAT}

unit Exselec1;

interface

uses
  Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls, OnGuard, OgUtil, TabNotBk, Menus;

type
  TForm1 = class(TForm)
    ModifyBtn: TButton;
    Memo1: TMemo;
    MainMenu1: TMainMenu;
    FeaturesMenu: TMenuItem;
    FeaturesRequired: TMenuItem;
    FeaturesHelp: TMenuItem;
    FeaturesExamples: TMenuItem;
    FeaturesDatabase: TMenuItem;
    FeaturesFax: TMenuItem;
    FeaturesGoodies: TMenuItem;
    OgUsageCode1: TOgUsageCode;
    OgSpecialCode1: TOgSpecialCode;
    function DecodeSpecialCode : Longint;
    procedure ModifyBtnClick(Sender: TObject);
    procedure EnableFeatures(Features : Longint);
    procedure OgUsageCode1GetKey(Sender: TObject; var Key: TKey);
    procedure OgUsageCode1GetCode(Sender: TObject; var Code: TCode);
    procedure OgUsageCode1Checked(Sender: TObject; Status: TCodeStatus);
    procedure OgSpecialCode1GetKey(Sender: TObject; var Key: TKey);
    procedure OgSpecialCode1GetCode(Sender: TObject; var Code: TCode);
    procedure OgSpecialCode1GetModifier(Sender: TObject;
      var Value: Longint);
    procedure OgSpecialCode1Checked(Sender: TObject; Status: TCodeStatus);
    procedure FormCreate(Sender: TObject);
    function FileGetCode(Index : Longint; var Code : TCode) : Boolean;
    procedure FilePutCode(Index : Longint; Code : TCode);
    procedure OgUsageCode1ChangeCode(Sender: TObject; Code: TCode);
  end;

var
  Form1: TForm1;

{----------------------------------------------------------------------}

implementation

{$R *.DFM}

const
    { The key was created by a separate program (CODEGEN) and is generic
      the examples, EXSELECT, EXSELAPI, and EXSLCODE }
  TheKey: TKey = ($F1,$46,$8D,$E4,$70,$AE,$92,$DC,
                  $13,$1A,$03,$C4,$44,$25,$72,$F5);

    { Initial code has 3 uses embedded }
  InitCode         : string = '13B1A08BD78AFCD3';
  CodeFile         : string = 'ExSelect.Dat';
  DemoCaption      : string = 'ExSelect: Demo runs left = ';
  RegisteredCap    : string = 'ExSelect: Registered';
  NotRegisteredCap : string = 'ExSelect: Not Registered';
  ModifyStr        : string = 'Modify Registration to enable this feature';

    { Feature masks }
  RequiredMask = $00000001;
  HelpMask =     $00000002;
  ExamplesMask = $00000004;
  DBMask =       $00000008;
  FaxMask =      $00000010;
  GoodiesMask =  $00000020;

var
  UsageCode             : TCode;          {Index = 0}
  SpecialCode           : TCode;          {Index = 1}


{=========== Initialization and File I/O ===============}

function TForm1.FileGetCode(Index : Longint; var Code : TCode) : Boolean;
var
  Dir, Path   : string;
  FileHandle  : Integer;
begin
  Dir := '';
  GetDir(0, Dir);
  Path := Dir + '\' + CodeFile;
  FillChar(Code, SizeOf(TCode), 0);
  if FileExists(Path) then begin
    FileHandle := FileOpen(Path, fmOpenRead);
    FileSeek(FileHandle, Index * SizeOf(Code), 0);
    FileRead(FileHandle, Code, SizeOf(Code));
    FileClose(FileHandle);
    Result := True;
  end else
    Result := False;
end;

{-------------------------------------------------------}

procedure TForm1.FilePutCode(Index : Longint; Code : TCode);
var
  Dir, Path   : string;
  FileHandle  : Integer;
begin
  Dir := '';
  GetDir(0, Dir);
  Path := Dir + '\' + CodeFile;
  if not FileExists(Path) then
    FileHandle := FileCreate(Path)
  else
    FileHandle := FileOpen(Path, fmOpenWrite);
  FileSeek(FileHandle, Index * SizeOf(Code), 0);
  FileWrite(FileHandle, Code, SizeOf(Code));
  FileClose(FileHandle);
end;

{-------------------------------------------------------}

procedure TForm1.FormCreate(Sender: TObject);
begin
  FillChar(SpecialCode, SizeOf(SpecialCode), 0);
  if not FileGetCode(0, UsageCode) then
    HexToBuffer(InitCode, UsageCode, SizeOf(UsageCode));
  OgUsageCode1.CheckCode(True);
end;


{=================== Usage Code Stuff ==================}

procedure TForm1.OgUsageCode1GetKey(Sender: TObject; var Key: TKey);
begin
  Key := TheKey;
end;

{-------------------------------------------------------}

procedure TForm1.OgUsageCode1GetCode(Sender: TObject; var Code: TCode);
begin
  Code := UsageCode;
end;

{-------------------------------------------------------}

procedure TForm1.OgUsageCode1Checked(Sender: TObject; Status: TCodeStatus);
begin
  { If usage code is valid, app is still in demo period so enable only
    default features }
  if (Status = ogValidCode) then begin
    OgUsageCode1.Decrease;
    EnableFeatures(RequiredMask);
  end else begin { Usage count has expired, go on to special code stuff }
    FileGetCode(1, SpecialCode);
    ModifyBtn.Enabled := True;
    OgSpecialCode1.CheckCode(True);
  end;
end;

{-------------------------------------------------------}

procedure TForm1.OgUsageCode1ChangeCode(Sender: TObject; Code: TCode);
var
  FreebiesLeft : Longint;
begin
  FreebiesLeft := OgUsageCode1.GetValue - 1;
  UsageCode := Code;
  FilePutCode(0, UsageCode);
  Caption := DemoCaption + IntToStr(FreebiesLeft);
end;


{================== Special Code Stuff =================}

procedure TForm1.OgSpecialCode1GetKey(Sender: TObject; var Key: TKey);
begin
  Key := TheKey;
end;

{-------------------------------------------------------}

procedure TForm1.OgSpecialCode1GetCode(Sender: TObject; var Code: TCode);
begin
  Code := SpecialCode;
end;

{-------------------------------------------------------}

procedure TForm1.OgSpecialCode1GetModifier(Sender: TObject;
  var Value: Longint);
begin
  Value := GenerateMachineModifierPrim;
end;

{-------------------------------------------------------}

procedure TForm1.OgSpecialCode1Checked(Sender: TObject;
  Status: TCodeStatus);
var
  Features : Longint;
begin
  { If special code is valid, then app is registered so enable features }
  if (Status = ogValidCode) then begin
    FilePutCode(1, SpecialCode);
    Features := OgSpecialCode1.GetValue;
    EnableFeatures(Features);
    Caption := RegisteredCap;
    Exit;
  end;
  { Otherwise prompt for release code}
  Features := DecodeSpecialCode;
  if (Features <> 0) then begin
    FilePutCode(1, SpecialCode);
    EnableFeatures(Features);
    Caption := RegisteredCap;
  end else begin
    EnableFeatures(0);
    Caption := NotRegisteredCap;
  end;
end;


{================== Registration Dialog ================}

function TForm1.DecodeSpecialCode : Longint;
var
  CodeStr   : string;
  ModKey    : TKey;
  MachineID : string;
  Modifier  : longint;
begin
  Result := 0;
  MachineID := '';
  Modifier := GenerateMachineModifierPrim;
  MachineID := BufferToHex(Modifier, SizeOf(Modifier));
  ModKey := TheKey;
  ApplyModifierToKeyPrim(Modifier, ModKey, SizeOf(ModKey));
  CodeStr := '';
  if InputQuery('Machine ID: '+ MachineID ,
       'Run EXSLCODE To Obtain Release Code', CodeStr) then begin
    HexToBuffer(CodeStr, SpecialCode, SizeOf(SpecialCode));
    if OgSpecialCode1.IsCodeValid then
      Result := OgSpecialCode1.GetValue;
  end;
end;


{================== The Rest of it ================}

procedure TForm1.EnableFeatures(Features : Longint);
begin
  FeaturesRequired.Enabled := False;
  FeaturesRequired.Checked := False;
  FeaturesHelp.Enabled := False;
  FeaturesHelp.Checked := False;
  FeaturesExamples.Enabled := False;
  FeaturesExamples.Checked := False;
  FeaturesDatabase.Enabled := False;
  FeaturesDatabase.Checked := False;
  FeaturesFax.Enabled := False;
  FeaturesFax.Checked := False;
  FeaturesGoodies.Enabled := False;
  FeaturesGoodies.Checked := False;
  if (Features and RequiredMask) <> 0 then begin
    FeaturesRequired.Enabled := True;
    FeaturesRequired.Checked := True;
  end;
  if (Features and HelpMask) <> 0 then begin
    FeaturesHelp.Enabled := True;
    FeaturesHelp.Checked := True;
  end;
  if (Features and ExamplesMask) <> 0 then begin
    FeaturesExamples.Enabled := True;
    FeaturesExamples.Checked := True;
  end;
  if (Features and DBMask) <> 0 then begin
    FeaturesDatabase.Enabled := True;
    FeaturesDatabase.Checked := True;
  end;
  if (Features and FaxMask) <> 0 then begin
    FeaturesFax.Enabled := True;
    FeaturesFax.Checked := True;
  end;
  if (Features and GoodiesMask) <> 0 then begin
    FeaturesGoodies.Enabled := True;
    FeaturesGoodies.Checked := True;
  end;
  if (Features = 0) then
    FeaturesMenu.Caption := 'No Features Enabled'
  else
    FeaturesMenu.Caption := '&Features';
end;

{-------------------------------------------------------}

procedure TForm1.ModifyBtnClick(Sender: TObject);
var
  Features : Longint;
begin
  FillChar(SpecialCode, SizeOf(SpecialCode), 0);
  Features := DecodeSpecialCode;
  if (Features <> 0) then begin
    FilePutCode(1, SpecialCode);
    EnableFeatures(Features);
    Caption := RegisteredCap;
  end;
end;

end.