Using the WindowsStore Component

TWindowsStore component allows you to connect a Windows application with the Windows Store and use features such as getting a list of apps owned by the user, available add-ons, purchased add-ons, and handle trial mode.

The TWindowsStore component is supported for Windows platforms only and RAD Studio 10.3 Alexandria includes a VCL version and a FireMonkey version. TWindowsStore is a component wrapper for the TWindowsStoreCore.

Checking apps and add-ons owned by the user

To retrieve a list of Windows applications and add-ons owned by the user, you have to insert the TWindowsStore component in the form or create it at runtime, add a TButton, and include the following code:

procedure TStoreForm.lbInfoClick(Sender: TObject);
var
  LMsg: string;
const
  //These consts mirrors the name of the Add-Ons ad defined
  //in the MS Windows Store. Using this approach you can “Ask” to the
  //store what the current user has bought.
  //The current user is indentified automatically because the
  //app has been downloaded from the store.
  HENRYFORDQUOTES = 'henryfordquotes';
  SAVETOFILE = 'savetofile';
  SAVEASFAVOURITE = 'saveasfavourite';
begin
  LMsg := '**You current situation**' + sLineBreak;
  LMsg := LMsg + 'You ' + IfThen(WindowsStore1.UserHasBought(HENRYFORDQUOTES),
    'have bought', 'don''t have bought') +
    ' the great Henry Ford aphorisms archive.' + sLineBreak;
  LMsg := LMsg + 'You ' + IfThen(WindowsStore1.UserHasBought(SAVETOFILE),
    'have bought', 'don''t have bought') +
    ' the ability to save aphorisms to file.' + sLineBreak;
  LMsg := LMsg + 'You ' + IfThen(WindowsStore1.UserHasBought(SAVEASFAVOURITE),
    'have bought', 'don''t have bought') +
    ' the ability to save aphorisms as favourite.' + sLineBreak;
  ShowMessage(LMsg);
end;

Accessing the available add-ons

The component also allows you to inspect all the available add-ons by accessing the AppProducts indexed property (sgAvailableProducts is a TStringGrid), as in the code shown below:

procedure TStoreForm.UpdateAvailableProducts;
var
  LProdsCount: Integer;
  I: Integer;
  LRow: TStrings;
begin
  LProdsCount := WindowsStore1.AppProducts.Count;
  for I := 0 to LProdsCount - 1 do
  begin
    LRow := sgAvailableProducts.Rows[I + 1];
    LRow.Add(WindowsStore1.AppProducts[I].StoreId.ToString);
    LRow.Add(WindowsStore1.AppProducts[I].Title.ToString);
    LRow.Add(WindowsStore1.AppProducts[I].Price.FormattedBasePrice.ToString);
    LRow.Add(WindowsStore1.AppProducts[I].ProductKind.ToString);
    LRow.Add(
      WindowsStore1.AppProducts[I].Price.IsOnSale.ToString(TUseBoolStrs.True)
    );    
    LRow.Add(
      WindowsStore1.AppProducts[I].IsInUserCollection
       .ToString(TUseBoolStrs.True)
    );
  end;
End;

Checking add-ons owned by the user

To retrieve a list of the add-ons owned by the user, use the UserCollection indexed property, which works in the same way as the AppProducts.

Handling Trial Mode

Use the AppLicense property to handle the TrialMode for your app as shown below:

procedure TStoreForm.lbTrialInformationClick(Sender: TObject);
var
  LRemainingTrialDays: Integer;
begin
  if WindowsStore1.AppLicense.IsActive then
  begin
    if WindowsStore1.AppLicense.IsTrial then
    begin
      LRemainingTrialDays := WindowsStore1.AppLicense.TrialTimeRemaining.Days;
      ShowMessage(
        Format('You can use this app for %d more days before the trial period ends.',
        [LRemainingTrialDays]));
    end
    else
    begin
      ShowMessage('You have a full license. The trial time is not meaningful.');
    end;

  end
  else
  begin
    ShowMessage('You don''t have a license. The trial time can''t be determined.');
  end;
End;

Note: This scenario is based upon the one described in https://github.com/Microsoft/Windows-universal-samples/blob/master/Samples/Store/cs/Scenario1_TrialMode.xaml.cs#L82.