UiaEventCallback callback function

Note  This function is deprecated. Client applications should use the Microsoft UI Automation Component Object Model (COM) interfaces instead.
A client-implemented function that is called by UI Automation when an event is raised that the client has subscribed to.


UiaEventCallback Uiaeventcallback;

void Uiaeventcallback(
  UiaEventArgs *pArgs,
  SAFEARRAY *pRequestedData,
  BSTR pTreeStructure



Type: UiaEventArgs*

The address of a UiaEventArgs structure that contains the event arguments.



A SAFEARRAY that contains data associated with the event.


Type: BSTR

A string that contains the structure of the tree associated with the event, if the event is associated with a set of nodes. See Remarks.

Return Value



This function is passed to UiaAddEvent and UiaRemoveEvent.

The tree structure is described by a string where every character is either "p" or ")". 
		The first character in the string always represents the root node. The string is <b>NULL</b> if 
		no elements are returned by the function. 

A "p" represents a node (UI Automation element). When one "p" directly follows another, the second node is a child of the first. A ")" represents a step back up the tree. For example, "pp)p" represents a node followed by two child nodes that are siblings of one another. In "pp))p", the last node is a sibling of the first one.


Minimum supported client Windows XP [desktop apps only]
Minimum supported server Windows Server 2003 [desktop apps only]
Target Platform Windows
Header uiautomationcoreapi.h