IUIAutomation::RemoveFocusChangedEventHandler method (uiautomationclient.h)

Removes a focus-changed event handler.

Syntax

HRESULT RemoveFocusChangedEventHandler(
  [in] IUIAutomationFocusChangedEventHandler *handler
);

Parameters

[in] handler

Type: IUIAutomationFocusChangedEventHandler*

A pointer to the event handler that was passed to IUIAutomation::AddFocusChangedEventHandler.

Return value

Type: HRESULT

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

Remarks

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.

It is possible for an event to be delivered to an event handler after the handler has been unsubscribed, if the event is received simultaneously with the request to unsubscribe the event. The best practice is to follow the Component Object Model (COM) standard and avoid destroying the event handler object until its reference count has reached zero. Destroying an event handler immediately after unsubscribing for events may result in an access violation if an event is delivered late.

Requirements

See also

IUIAutomation

RemoveAllEventHandlers

RemoveAutomationEventHandler

RemovePropertyChangedEventHandler

RemoveStructureChangedEventHandler