IUIAutomation3::RemoveTextEditTextChangedEventHandler method (uiautomationclient.h)

Article
10/13/2021

Removes a programmatic text-edit event handler.

Syntax

HRESULT RemoveTextEditTextChangedEventHandler(
  [in] IUIAutomationElement                         *element,
  [in] IUIAutomationTextEditTextChangedEventHandler *handler
);

Parameters

[in] element

Type: IUIAutomationElement*

A pointer to the UI Automation element from which to remove the handler.

[in] handler

Type: IUIAutomationTextEditTextChangedEventHandler*

A pointer to the interface that was passed to IUIAutomation3::AddTextEditTextChangedEventHandler.

Return value

Type: HRESULT

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

Remarks

A Microsoft 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

Requirement	Value
Minimum supported client	Windows 8.1 [desktop apps only]
Minimum supported server	Windows Server 2012 R2 [desktop apps only]
Target Platform	Windows
Header	uiautomationclient.h (include UIAutomation.h)