Service object

Artigo
08/31/2015

The Service object represents an individual service on the device and provides access to the properties, methods, and events that are exposed by the service and its content.

A Service object can be retrieved in the following ways: by a zero-based numeric index, by Persistent Unique ID (PUID), or by service type, as shown in the following code.

// Retrieve a service object by index.
var serviceObject = deviceObject.Services[Index];

// Retrieve a service object by PUID.
var serviceObject = deviceObject.Services[PUID];

// Retrieve a service object by service type.
var coolServices = deviceObject.GetServicesByType("{123456678-AAAA-BBBB-CCCC-DDDDEEEEFFFF}");
var serviceObject = coolServices[Index];

Members

The Service object has these types of members:

Events
Methods
Properties

Events

The Service object has these events.

Event	Description
onAddChildComplete	Occurs when a Service.AddChild operation is completed.
onGetChildrenByFormatComplete	Occurs when a Service.GetChildrenByFormat operation is completed.
onMethodComplete	Occurs after a service-defined method is completed.
onObjectAdded	Occurs after an object is added to this Service object.
onObjectRemoved	Occurs after an object is removed from this Service object.
onObjectUpdated	Occurs after an object is updated on this Service object.
onRemoveChildComplete	Occurs when a Service.RemoveChild operation is completed.
onServiceEventName	The name of this event is defined by the service. For example, if a service defines an event called MySuperEvent, the event handler property will be onMySuperEvent.

Methods

The Service object has these methods.

Method	Description
AddChild	Adds a WPDObject, obtained from the Service.CreateNewObject method, as a child of this Service object.
CreateNewObject	Creates and initializes a WPDObject to the specified data format.
GetChildrenByFormat	Returns a collection of the immediate children of this Service object filtered by one or more formats.
*Method*	Invokes a service-defined method.
RemoveChild	Deletes a child object from this Service object.

Properties

The Service object has these properties.

Property	Access type	Description
AbstractServices	Read-only	Gets a collection of the abstract service GUIDs that this service implements.
Children	Read-only	Gets a collection of all of the immediate children of this Service object.
*ServiceProperty*	Read/write	Gets or sets a service-defined property of this Service object.
*WpdProperty*	Read/write	Gets or sets a predefined WPD property for this Service object.

Requirements

Minimum supported client	Windows 7 [desktop apps only]
Minimum supported server	Windows Server 2008 R2 [desktop apps only]

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