DeviceWatcher.Start | start method

Starts a search for devices, and subscribes to device enumeration events.

Syntax


deviceWatcher.start();

Parameters

This method has no parameters.

Remarks

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

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

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

state diagram of DeviceWatcher states

Requirements (device family)

Device family

Universal

API contract

Windows.Foundation.UniversalApiContract, introduced version 1.0

Namespace

Windows.Devices.Enumeration
Windows::Devices::Enumeration [C++]

Metadata

Windows.Foundation.UniversalApiContract.winmd

Requirements (operating system)

Minimum supported client

Windows 8

Minimum supported server

Windows Server 2012

Minimum supported phone

Windows Phone 8.1 [Windows Phone Silverlight 8.1 and Windows Runtime apps]

Namespace

Windows.Devices.Enumeration
Windows::Devices::Enumeration [C++]

Metadata

Windows.winmd

See also

DeviceWatcher

 

 

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