(*
  This example uses the TOgSerialNumber component. The first time
  the program is run, the user is prompted for his serial number
  and release code.

  If the program is being run the first time (as determined by the
  existance of an INI file, a dialog box is displayed showing two
  entry fields: one for the serial number, the other for the release
  code. The user enters the values that you give him for these two
  items. The values are stored in the INI file and the program is
  allowed to run.

  The release code you give the user can be generated by the CODEGEN
  example program. Be sure to select the same type component, the
  key used to compile the application (the one returned in the
  OnGetKey event), Also, if used, make sure the Expires date is
  the same.
*)

unit Exsrnmu1;

interface

uses
  SysUtils, WinTypes, WinProcs, Messages, Classes, Graphics, Controls,
  Forms, Dialogs, OnGuard, StdCtrls, Buttons,

  OgUtil,
  IniFiles;

const
  CKey : TKey = ($E5,$8F,$84,$D6,$92,$C9,$A4,$D8,
                 $1A,$FA,$6F,$8D,$AB,$FC,$DF,$B4);

type
  TForm1 = class(TForm)
    Memo1: TMemo;
    CloseBtn: TBitBtn;
    Label1: TLabel;
    OgSerialNumberCode1: TOgSerialNumberCode;
    procedure OgSerialNumberCode1GetKey(Sender: TObject; var Key: TKey);
    procedure OgSerialNumberCode1GetCode(Sender: TObject; var Code: TCode);
    procedure OgSerialNumberCode1Checked(Sender: TObject;
      Status: TCodeStatus);
  private
    { Private declarations }
  public
    { Public declarations }
    TheDir     : string;
    IniSNVal   : longint;
    IniFile    : TIniFile;
    ED         : TDateTime;

    function GetSNData(var S : string) : integer;
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

uses
  Exsrnmu2;

{=======================================================================}

procedure TForm1.OgSerialNumberCode1GetKey(Sender: TObject; var Key: TKey);
begin
  Key := CKey;
end;

{=======================================================================}


procedure TForm1.OgSerialNumberCode1GetCode(Sender: TObject; var Code: TCode);
var
  S1  : string;
  L   : integer;
begin
  {force the INI file to be in the same directory as the application}
  TheDir := ExtractFilePath(ParamStr(0));
  L := Length(TheDir);
  if (L > 3) and (TheDir[L] <> '\') then
    TheDir := TheDir + '\';

  (*
  this check helps prevent an empty INI file. An empty or incomplete
  INI file can cause problems, i.e., if something goes wrong during
  the initial input of the SN and ReleaseCode, the program could
  not be run again without deleting the INI file. In a "real world"
  application, you would probably be hiding these values some how and
  would either have to tell the user where to delete things or have a
  utility program to do so.
  *)
  if not (FileExists(TheDir + 'SNCode.INI')) then
    Exit;

  {open Ini File}
  IniFile := TIniFile.Create(TheDir + 'SNCode.INI');
  try
    {try to read release code}
    S1 := IniFile.ReadString('Codes', 'SNCode', '');
    IniSNVal := IniFile.ReadInteger('Codes', 'SN', 0);

    {convert retrieved string to a code}
    HexToBuffer(S1, Code, SizeOf(Code));
  finally
    IniFile.Free;
  end;
end;

{=======================================================================}

function TForm1.GetSNData(var S : string) : integer;
var
  TC  : TCode;
  SNC : string;
begin
  Application.CreateForm(TSNEntryDlg, SNEntryDlg);
  try
    {Display new SN and ask for release code}
    SNEntryDlg.SNText.Text := '';
    SNEntryDlg.CodeText.Text := '';

    Result := SNEntryDlg.ShowModal;
    if (SNEntryDlg.CodeText.Text = '') or
       (SNEntryDlg.SNText.Text = '') then
      Result := mrCancel;
    if (Result = mrCancel) then begin
      S := 'Invalid Code or Cancelled';
      Exit;
    end;

    {Check that Release Code was entered correctly}
    HexToBuffer(SNEntryDlg.CodeText.Text, TC, SizeOf(TCode));
    if not (IsSerialNumberCodeValid(CKey, TC)) then begin
      S := 'Release code not entered correctly';
      Result := mrCancel;
    end else begin
      IniFile := TIniFile.Create(TheDir + 'SNCode.INI');
      try

        {
        Write SN to IniFile and set a global variable to the value
        of the serial number. Since, by design, the TOgSerialNumber
        component does not confirm that the SN and ReleaseCode retrieved
        from the INI file are compatible, this value will be used later to
        see if the user has attempted to change the contents of the INI file
        }
        IniSNVal := StrToInt(SNEntryDlg.SNText.Text);
        SNC := SNEntryDlg.CodeText.Text;
        IniFile.WriteInteger('Codes', 'SN', IniSNVal);
        IniFile.WriteString('Codes', 'SNCode', SNC);
      finally
        IniFile.Free;
      end;
    end;
  finally
    SNEntryDlg.Free;
  end;
end;

{=======================================================================}

procedure TForm1.OgSerialNumberCode1Checked(Sender: TObject;
                                            Status: TCodeStatus);
var
  S,
  C1,
  C2  : string;
  TC  : TCode;
  LI  : longint;
begin
  case Status of
    ogValidCode   : begin
                      {check if retrieved Serial Number matches Code}
                      LI := OgSerialNumberCode1.GetValue;

                      if (LI <> IniSNVal) then begin
                        Status := ogInvalidCode;
                        S := 'The serial number has been changed';
                      end else begin
                        Label1.Caption := 'Serial #: ' + IntToStr(IniSNVal);
                        Exit;
                      end;
                    end;

    ogInvalidCode : begin
                      {if INI file doesn't exist, presume this is first run}
                      if not (FileExists(TheDir + 'SNCode.INI')) then begin
                        if not (GetSNData(S) = mrCancel) then begin
                          {Check the SN/ReleaseCode}
                          OgSerialNumberCode1.CheckCode(True);
                          {must Exit since line above began a recursive call}
                          Exit;
                        end;
                      end else
                        S := 'Invalid Code';
                    end;

    ogCodeExpired : S := 'Evaluation period expired';
  end;

  ShowMessage(S);
  Application.Terminate;
end;


end.