通过

ProximityDevice.FromId(String) 方法

  • 参考

定义

命名空间:
Windows.Networking.Proximity
编辑

创建 ProximityDevice 类的实例并激活指定的邻近感应设备接口。

public:
 static ProximityDevice ^ FromId(Platform::String ^ deviceId);
 static ProximityDevice FromId(winrt::hstring const& deviceId);
public static ProximityDevice FromId(string deviceId);
function fromId(deviceId)
Public Shared Function FromId (deviceId As String) As ProximityDevice

参数

deviceId
String

Platform::String

winrt::hstring

邻近设备的 DeviceInformation ID 。

返回

ProximityDevice

使用指定邻近感应设备接口的新 ProximityDevice 。 如果指定的邻近设备接口不可使用，则引发 System.IO.FileNotFoundException 异常。

Windows 要求

应用功能
ID_CAP_PROXIMITY [Windows Phone] proximity ID_CAP_PROXIMITY [Windows Phone]

示例

Windows.Networking.Proximity.ProximityDevice proximityDevice;

private async void InitializeProximity()
{
    string selectorString = Windows.Networking.Proximity.ProximityDevice.GetDeviceSelector();

    var deviceInfoCollection =
        await Windows.Devices.Enumeration.DeviceInformation.FindAllAsync(selectorString, null);

        if (deviceInfoCollection.Count == 0)
        {
            StatusTextBlock.Text = "No proximity devices found.";
        } 
        else 
        {
            StatusTextBlock.Text = "Proximity Device id = " + deviceInfoCollection[0].Id;
            proximityDevice =
                Windows.Networking.Proximity.ProximityDevice.FromId(deviceInfoCollection[0].Id);
        }
}

Private proximityDevice As Windows.Networking.Proximity.ProximityDevice

Private Async Sub InitializeProximity()
    Dim selectorString = Windows.Networking.Proximity.ProximityDevice.GetDeviceSelector()

    Dim deviceInfoCollection =
        Await Windows.Devices.Enumeration.DeviceInformation.FindAllAsync(selectorString, {"{FB3842CD-9E2A-4F83-8FCC-4B0761139AE9} 2"})

    If deviceInfoCollection.Count = 0 Then
        StatusTextBlock.Text = "No proximity devices found."
    Else
        StatusTextBlock.Text = "Proximity Device id = " & deviceInfoCollection(0).Id
        proximityDevice =
            Windows.Networking.Proximity.ProximityDevice.FromId(deviceInfoCollection(0).Id)
    End If
End Sub

注解

可以通过将 GetDeviceSelector 方法返回的类选择字符串传递给 FindAllAsync 或 CreateWatcher 方法来枚举邻近感应设备。 然后，可以使用生成的 DeviceInformation ID 值 () 使用 FromId 方法创建 ProximityDevice 的实例。

适用于

另请参阅