IUIAutomationEventHandlerGroup::AddStructureChangedEventHandler method (uiautomationclient.h)

Registers a method that handles structure-changed 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.


HRESULT AddStructureChangedEventHandler(
       TreeScope                                 scope,
  [in] IUIAutomationCacheRequest                 *cacheRequest,
  [in] IUIAutomationStructureChangedEventHandler *handler



[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 structure-changed event.

Return value

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


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


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