公開伺服器端 UI 自動化提供者
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這份文件適用於想要使用 System.Windows.Automation 命名空間中定義之 Managed UI Automation 類別的 .NET Framework 開發人員。如需 UI Automation 的最新資訊，請參閱 Windows Automation API：使用者介面自動化 (英文)。 |
本主題包含範例程式碼，顯示如何公開 (Expose) 裝載 (Host) 在 System.Windows.Forms.Control 視窗中的伺服器端 UI 自動化提供者。
這段程式碼會覆寫視窗程序，在用戶端應用程式要求視窗相關資訊時，截取 UI Automation核心服務所傳送的訊息 WM_GETOBJECT。
範例
''' <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);
}