IUIAutomationTreeWalker::GetFirstChildElementBuildCache method

Retrieves the first child element of the specified UI Automation element, and caches properties and control patterns.


HRESULT GetFirstChildElementBuildCache(
  [in]          IUIAutomationElement      *element,
  [in]          IUIAutomationCacheRequest *cacheRequest,
  [out, retval] IUIAutomationElement      **first


element [in]

Type: IUIAutomationElement*

A pointer to the element for which to retrieve the first child.

cacheRequest [in]

Type: IUIAutomationCacheRequest*

A pointer to a cache request that specifies the properties and control patterns to cache on the returned element.

first [out, retval]

Type: IUIAutomationElement**

Receives a pointer to the first child element, or NULL if there is no child element.

Return value


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


An element can have additional child elements that do not match the current view condition and thus are not returned when navigating the element tree.

The structure of the Microsoft UI Automation tree changes as the visible UI elements on the desktop change. It is not guaranteed that an element returned as the first child element will be returned as the first child on subsequent passes.


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]


UIAutomationClient.h (include UIAutomation.h)