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ProximityDevice.GetDefault Metodo

  • Riferimento

Definizione

Spazio dei nomi:
Windows.Networking.Proximity
Modifica

Crea un'istanza di una classe ProximityDevice e attiva il provider di prossimità predefinito.

public:
 static ProximityDevice ^ GetDefault();
 static ProximityDevice GetDefault();
public static ProximityDevice GetDefault();
function getDefault()
Public Shared Function GetDefault () As ProximityDevice

Restituisce

ProximityDevice

Nuovo dispositivo di prossimità che usa il provider di prossimità predefinito. Restituisce NULL se non vengono installati dispositivi di prossimità.

Requisiti Windows

Funzionalità dell'app
ID_CAP_PROXIMITY [Windows Phone] proximity ID_CAP_PROXIMITY [Windows Phone]

Esempio

Windows.Networking.Proximity.ProximityDevice proximityDevice;

private void InitializeProximityDevice()
{
    proximityDevice = Windows.Networking.Proximity.ProximityDevice.GetDefault();

    if (proximityDevice != null) {
        proximityDevice.DeviceArrived += ProximityDeviceArrived;
        proximityDevice.DeviceDeparted += ProximityDeviceDeparted;

        WriteMessageText("Proximity device initialized.\n");
    }
    else
    {
        WriteMessageText("Failed to initialized proximity device.\n");
    }
}

private void ProximityDeviceArrived(Windows.Networking.Proximity.ProximityDevice device)
{
    WriteMessageText("Proximate device arrived. id = " + device.DeviceId + "\n");
}

private void ProximityDeviceDeparted(Windows.Networking.Proximity.ProximityDevice device)
{
    WriteMessageText("Proximate device departed. id = " + device.DeviceId + "\n");
}

// Write a message to MessageBlock on the UI thread.
private Windows.UI.Core.CoreDispatcher messageDispatcher = Window.Current.CoreWindow.Dispatcher;

async private void WriteMessageText(string message, bool overwrite = false)
{
    await messageDispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal,
        () =>
        {
            if (overwrite)
                MessageBlock.Text = message;
            else
                MessageBlock.Text += message;
        });
}

Dim proximityDevice As Windows.Networking.Proximity.ProximityDevice

Private Sub InitializeProximityDevice()

    proximityDevice = Windows.Networking.Proximity.ProximityDevice.GetDefault()

    If proximityDevice IsNot Nothing Then
        AddHandler proximityDevice.DeviceArrived, AddressOf ProximityDeviceArrived
        AddHandler proximityDevice.DeviceDeparted, AddressOf ProximityDeviceDeparted

        WriteMessageText("Proximity device initialized." & vbTab)
    Else
        WriteMessageText("Failed to initialized proximity device." & vbTab)
    End If
End Sub

Private Sub ProximityDeviceArrived(device As Windows.Networking.Proximity.ProximityDevice)
    WriteMessageText("Proximate device arrived. id = " & device.DeviceId & vbTab)
End Sub

Private Sub ProximityDeviceDeparted(device As Windows.Networking.Proximity.ProximityDevice)
    WriteMessageText("Proximate device departed. id = " & device.DeviceId & vbTab)
End Sub

' Write a message to MessageBlock on the UI thread.
Private Async Sub WriteMessageText(message As String, Optional overwrite As Boolean = False)
    Await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal,
        Sub()
            If overwrite Then
                MessageBlock.Text = message
            Else
                MessageBlock.Text &= message
            End If
        End Sub)
End Sub

Si applica a

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