Question

我看到了一些使用VB.NET解析UI Automation树的示例代码。代码在这里：

'' <summary> 
''' Walks the UI Automation tree and adds the control type of each element it finds  
''' in the control view to a TreeView. 
''' </summary> 
''' <param name="rootElement">The root of the search on this iteration.</param> 
''' <param name="treeNode">The node in the TreeView for this iteration.</param> 
''' <remarks> 
''' This is a recursive function that maps out the structure of the subtree beginning at the 
''' UI Automation element passed in as rootElement on the first call. This could be, for example, 
''' an application window. 
''' CAUTION: Do not pass in AutomationElement.RootElement. Attempting to map out the entire subtree of 
''' the desktop could take a very long time and even lead to a stack overflow. 
''' </remarks> 

Private Sub WalkControlElements(ByVal rootElement As AutomationElement, ByVal treeNode As TreeNode)
    ' Conditions for the basic views of the subtree (content, control, and raw)  
    ' are available as fields of TreeWalker, and one of these is used in the  
    ' following code. 

    Dim elementNode As AutomationElement = TreeWalker.ControlViewWalker.GetFirstChild(rootElement)

    While (elementNode IsNot Nothing)
        Dim childTreeNode As TreeNode = treeNode.Nodes.Add(elementNode.Current.ControlType.LocalizedControlType)
        WalkControlElements(elementNode, childTreeNode)
        elementNode = TreeWalker.ControlViewWalker.GetNextSibling(elementNode)
    End While 

End Sub 'WalkControlElements

如果我想使用它，我必须传入rootElement。我想知道这是什么语法？使用UISpy，我可以看到类名是“WindowsForm10.Window.8.app.0.378734a”。

Answer 1

AutomationElement.RootElement会为您提供AutomationElement树的根，即桌面。如果您想获得不同的元素，可以创建Condition对象，然后调用AutomationElement.RootElement.FindFirst或AutomationElement.RootElement.FindAll，具体取决于您要在此处执行的操作。

如何为UI Automation树指定树的根节点

1 个答案: