公开服务器端 UI 自动化提供程序
.gif "注意") 注意 |
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本文档的目标读者是欲使用 System.Windows.Automation 命名空间中定义的托管 UI Automation类的 .NET Framework 开发人员。有关 UI Automation的最新信息，请参见 Windows Automation API: UI Automation（Windows 自动化 API：UI 自动化）。 |
本主题包含代码示例，该代码示例演示如何公开 System.Windows.Forms.Control 窗口中承载的服务器端 UI 自动化提供程序。
该示例重写窗口过程以捕获 WM_GETOBJECT，这是在客户端应用程序请求有关该窗口的信息时由 UI Automation核心服务发送的消息。
示例
''' <summary>
''' Handles WM_GETOBJECT message; others are passed to base handler.
''' </summary>
''' <param name="m">Windows message.</param>
''' <remarks>
''' This method enables UI Automation to find the control.
''' In this example, the implementation of IRawElementProvider is in the same class
''' as this method.
''' </remarks>
Protected Overrides Sub WndProc(ByRef m As Message)
Const WM_GETOBJECT As Integer = &H3D
If m.Msg = WM_GETOBJECT AndAlso m.LParam.ToInt32() = AutomationInteropProvider.RootObjectId Then
m.Result = AutomationInteropProvider.ReturnRawElementProvider(Me.Handle, m.WParam, m.LParam, DirectCast(Me, IRawElementProviderSimple))
Return
End If
MyBase.WndProc(m)
End Sub 'WndProc
/// <summary>
/// Handles WM_GETOBJECT message; others are passed to base handler.
/// </summary>
/// <param name="m">Windows message.</param>
/// <remarks>
/// This method enables UI Automation to find the control.
/// In this example, the implementation of IRawElementProvider is in the same class
/// as this method.
/// </remarks>
protected override void WndProc(ref Message m)
{
const int WM_GETOBJECT = 0x003D;
if ((m.Msg == WM_GETOBJECT) && (m.LParam.ToInt32() ==
AutomationInteropProvider.RootObjectId))
{
m.Result = AutomationInteropProvider.ReturnRawElementProvider(
this.Handle, m.WParam, m.LParam,
(IRawElementProviderSimple)this);
return;
}
base.WndProc(ref m);
}