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IUIAutomationEventHandlerGroup::AddChangesEventHandler method (uiautomationclient.h)

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Registers a method that handles change events.

Important  Microsoft UI Automation clients should use the handler group methods to register event listeners instead of individual event registration methods defined in the various IUIAutomation namespaces.
 

Syntax

HRESULT AddChangesEventHandler(
  [in] TreeScope                        scope,
  [in] int                              *changeTypes,
  [in] int                              changesCount,
  [in] IUIAutomationCacheRequest        *cacheRequest,
  [in] IUIAutomationChangesEventHandler *handler
);

Parameters

[in] scope

The scope of events to be handled; that is, whether they are on the element itself, or on its ancestors and descendants.

[in] changeTypes

A pointer to a list of integers that indicate the change types the event represents.

[in] changesCount

The number of changes that occurred in this event.

[in] cacheRequest

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

[in] handler

A pointer to the object that handles the changes event.

Return value

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

Remarks

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

Requirements

Requirement Value
Minimum supported client Windows 10, version 1809 [desktop apps only]
Minimum supported server Windows Server, version 1709 [desktop apps only]
Target Platform Windows
Header uiautomationclient.h (include UIAutomation.h)

See also

IUIAutomationEventHandlerGroup