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MagneticStripeReader.ClaimReaderAsync Metodo

  • Riferimento

Definizione

Spazio dei nomi:
Windows.Devices.PointOfService
Modifica

Tenta di ottenere un accesso esclusivo al lettore di striscia magnetica.

public:
 virtual IAsyncOperation<ClaimedMagneticStripeReader ^> ^ ClaimReaderAsync() = ClaimReaderAsync;
/// [Windows.Foundation.Metadata.RemoteAsync]
IAsyncOperation<ClaimedMagneticStripeReader> ClaimReaderAsync();
[Windows.Foundation.Metadata.RemoteAsync]
public IAsyncOperation<ClaimedMagneticStripeReader> ClaimReaderAsync();
function claimReaderAsync()
Public Function ClaimReaderAsync () As IAsyncOperation(Of ClaimedMagneticStripeReader)

Restituisce

IAsyncOperation<ClaimedMagneticStripeReader>

Al termine del metodo, restituisce un valore ClaimedMagneticStripeReader oppure restituisce Null se l'operazione non riesce a richiedere un lettore di strisce magnetiche.

Attributi
RemoteAsyncAttribute

Esempio

// Claims the magnetic stripe reader for exclusive use
task<void> Scenario1::ClaimReader()
{
    
    return create_task(_reader->ClaimReaderAsync()).then([this] (ClaimedMagneticStripeReader^ claimedReader)
    {
        _claimedReader = claimedReader;
        if (_claimedReader != nullptr)
        {
            // UpdateReaderStatusTextBlock("Magnetic stripe reader claimed successfully.");		
        }
        else
        {
            // UpdateReaderStatusTextBlock("Failed to claim the magnetic stripe reader.");
        }
    });
}

// Claims the magnetic stripe reader for exclusive use.

private async Task<bool> ClaimReader()
{
    if (_claimedReader == null)
    {
        _claimedReader = await _reader.ClaimReaderAsync();

        if (_claimedReader != null)
        {
            // UpdateReaderStatusTextBlock("Magnetic stripe reader claimed successfully.");
        }
        else
        {
            // UpdateReaderStatusTextBlock("Failed to claim a magnetic stripe reader.");
            return false;
        }
    }
    return true;
}

Si applica a

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