IUIAutomation::AddPropertyChangedEventHandlerNativeArray method (uiautomationclient.h)

Registers a method that handles a native array of property-changed events.

Note  Before implementing an event handler, you should be familiar with the threading issues described in Understanding Threading Issues.


HRESULT AddPropertyChangedEventHandlerNativeArray(
  [in] IUIAutomationElement                     *element,
       TreeScope                                scope,
  [in] IUIAutomationCacheRequest                *cacheRequest,
  [in] IUIAutomationPropertyChangedEventHandler *handler,
  [in] PROPERTYID                               *propertyArray,
  [in] int                                      propertyCount


[in] element

Type: IUIAutomationElement*

A pointer to the UI Automation element associated with the event handler.


[in] cacheRequest

Type: IUIAutomationCacheRequest*

A pointer to a cache request, or NULL if no caching is wanted.

[in] handler

Type: IUIAutomationPropertyChangedEventHandler*

A pointer to the object that handles the event.

[in] propertyArray


A pointer to the identifiers of the UI Automation properties of interest. For a list of property IDs, see Property Identifiers.

[in] propertyCount

Type: int

The number of property identifiers in propertyArray.

Return value


If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.


For code examples that show how to implement interfaces that enable clients to receive and handle Microsoft UI Automation events (including AddPropertyChangedEventHandlerNativeArray), see How to Implement Event Handlers.


The UI item specified by element might not support the properties specified by the propertyArray parameter.

This method serves the same purpose as IUIAutomation::AddPropertyChangedEventHandler, but takes a normal array of property identifiers instead of a SAFEARRAY.

A UI Automation client should not use multiple threads to add or remove event handlers. Unexpected behavior can result if one event handler is being added or removed while another is being added or removed in the same client process.


Minimum supported client Windows 7, Windows Vista with SP2 and Platform Update for Windows Vista, Windows XP with SP3 and Platform Update for Windows Vista [desktop apps only]
Minimum supported server Windows Server 2008 R2, Windows Server 2008 with SP2 and Platform Update for Windows Server 2008, Windows Server 2003 with SP2 and Platform Update for Windows Server 2008 [desktop apps only]
Target Platform Windows
Header uiautomationclient.h (include UIAutomation.h)

See also


Caching UI Automation Properties and Control Patterns






Subscribing to UI Automation Events

Understanding Threading Issues