ClaimedMagneticStripeReader.ReleaseDeviceRequested Ereignis
Definition
Wichtig
Einige Informationen beziehen sich auf Vorabversionen, die vor dem Release ggf. grundlegend überarbeitet werden. Microsoft übernimmt hinsichtlich der hier bereitgestellten Informationen keine Gewährleistungen, seien sie ausdrücklich oder konkludent.
Tritt auf, wenn das Gerät eine Anforderung zur Freigabe seines exklusiven Anspruchs erhält.
// Register
event_token ReleaseDeviceRequested(EventHandler<ClaimedMagneticStripeReader> const& handler) const;
// Revoke with event_token
void ReleaseDeviceRequested(event_token const* cookie) const;
// Revoke with event_revoker
ClaimedMagneticStripeReader::ReleaseDeviceRequested_revoker ReleaseDeviceRequested(auto_revoke_t, EventHandler<ClaimedMagneticStripeReader> const& handler) const;
public event System.EventHandler<ClaimedMagneticStripeReader> ReleaseDeviceRequested;
function onReleaseDeviceRequested(eventArgs) { /* Your code */ }
claimedMagneticStripeReader.addEventListener("releasedevicerequested", onReleaseDeviceRequested);
claimedMagneticStripeReader.removeEventListener("releasedevicerequested", onReleaseDeviceRequested);
- or -
claimedMagneticStripeReader.onreleasedevicerequested = onReleaseDeviceRequested;
Public Custom Event ReleaseDeviceRequested As EventHandler(Of ClaimedMagneticStripeReader)
Ereignistyp
Beispiele
Im folgenden Beispiel wird das Einrichten des Ereignishandlers veranschaulicht.
void Scenario1::ScenarioStartReadButton_Click(Platform::Object^ sender, Windows::UI::Xaml::RoutedEventArgs^ e)
{
create_task(CreateDefaultReaderObject()).then([this](void)
{
if (_reader != nullptr)
{
// Claim the magnetic stripe reader for exclusive use by your application.
create_task(ClaimReader()).then([this](void)
{
if (_claimedReader)
{
// Add a release device requested event handler. If this event is not handled,
// another app can claim the magnetic stripe reader.
_releaseDeviceRequestedToken = _claimedReader->ReleaseDeviceRequested::add(ref new EventHandler<ClaimedMagneticStripeReader^>(this, &Scenario1::OnReleaseDeviceRequested));
// Add a data receive event handler.
_bankCardDataReceivedToken = _claimedReader->BankCardDataReceived::add(ref new TypedEventHandler<ClaimedMagneticStripeReader^, MagneticStripeReaderBankCardDataReceivedEventArgs^>(this, &Scenario1::OnBankCardDataReceived));
UpdateReaderStatusTextBlock("Attached the BankCardDataReceived event handler..");
// Set the app to decode the raw data from the magnetic stripe reader.
_claimedReader->IsDecodeDataEnabled = true;
// Enable the magnetic stripe reader.
create_task(EnableReader()).then([this](void)
{
UpdateReaderStatusTextBlock("Ready to Swipe..");
// Reset the button state
ScenarioEndReadButton->IsEnabled = true;
ScenarioStartReadButton->IsEnabled = false;
});
}
});
}
});
}
private async void ScenarioStartReadButton_Click(object sender, RoutedEventArgs e)
{
if (await CreateDefaultMagneticStripeReaderObject())
{
if (_reader != null)
{
// Claim the reader for exclusive use by your application.
if (await ClaimReader())
{
if (_claimedReader != null)
{
/// Add a release device requested event handler. If this event is not handled,
// another app can claim the magnetic stripe reader.
_claimedReader.ReleaseDeviceRequested += OnReleaseDeviceRequested;
// Add a data receive event handler.
_claimedReader.BankCardDataReceived += OnBankCardDataReceived;
UpdateReaderStatusTextBlock("Attached the BankCardDataReceived Event handler..");
// Set the app to decode the raw data from the magnetic stripe reader.
_claimedReader.IsDecodeDataEnabled = true;
// Enable the magnetic stripe reader.
if (await EnableReader())
{
UpdateReaderStatusTextBlock("Ready to Swipe..");
// Reset the button state
ScenarioEndReadButton.IsEnabled = true;
ScenarioStartReadButton.IsEnabled = false;
}
}
}
}
}
}
void Scenario1::OnReleaseDeviceRequested(Platform::Object ^sender, Windows::Devices::PointOfService::ClaimedMagneticStripeReader ^args)
{
// Always retain the device. If it is not retained, this exclusive claim will be lost.
args->RetainDevice();
}
void OnReleaseDeviceRequested(object sender, ClaimedMagneticStripeReader args)
{
// Always retain the device. If it is not retained, this exclusive claim will be lost.
args.RetainDevice();
}