PnpObjectWatcher PnpObjectWatcher PnpObjectWatcher PnpObjectWatcher PnpObjectWatcher Class

Definition

public : sealed class PnpObjectWatcher

struct winrt::Windows::Devices::Enumeration::Pnp::PnpObjectWatcher

public sealed class PnpObjectWatcher

Public NotInheritable Class PnpObjectWatcher

// This class does not provide a public constructor.

Attributes

ContractVersionAttribute DualApiPartitionAttribute MarshalingBehaviorAttribute

Windows 10 requirements

Remarks

An app calls Start to begin the search for devices. During this initial enumeration, the PnpObjectWatcher raises an Added event for each device that's found, until all devices are found. The PnpObjectWatcher raises an EnumerationCompleted event when the initial enumeration is complete, and continues to raise events if a device is added, updated, or removed.

The following diagram shows how the PnpObjectWatcher transitions between the states represented by DeviceWatcherStatus enumeration.

The Start method can only be called when the PnpObjectWatcher is in the Created, Stopped or Aborted state. The Status property indicates the PnpObjectWatcher state. When re-starting the watcher, wait for the Stopped event before calling Start.

A call to Stop transitions the PnpObjectWatcher to the Stopping state and completes immediately. The watcher will transition to the Stopped state once all events that are already in the process of being raised have completed.

After calling Stop, apps may wait for the Stopped event if they need to know when the PnpObjectWatcher has stopped. Callers must wait for the Stopped event before they can call Start to restart the watcher. Callers may unsubscribe from events if they do not want to receive any additional events after Stop but do not want to wait for the Stopped event.

Properties

Methods

Events