Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / AccessibleTech / longhorn / Automation / UIAutomationProvider / MS / Internal / Automation / UiaCoreProviderApi.cs / 1 / UiaCoreProviderApi.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // // Description: Imports from unmanaged UiaCore DLL // // History: // 06/02/2003 : [....] Ported to WCP // //--------------------------------------------------------------------------- using System; using System.Security; using System.Windows.Automation; using System.Windows.Automation.Provider; using System.Runtime.InteropServices; using Microsoft.Internal; namespace MS.Internal.Automation { internal static class UiaCoreProviderApi { //----------------------------------------------------- // // Internal Methods // //----------------------------------------------------- #region Internal Methods // // Provider-side methods... // #region Provider methods ////// Critical: This code calls into the unmanaged UIAutomationCore.dll /// TreatAsSafe: This method is used to return an IRawElementProviderSimple associated with an HWND to UIAutomation in response to a WM_GETOBJECT /// The returned value is simply an LRESULT, so is harmless, and the input values are verfied on the unmanaged side, so it is not abusable. /// [SecurityCritical,SecurityTreatAsSafe] internal static IntPtr UiaReturnRawElementProvider(IntPtr hwnd, IntPtr wParam, IntPtr lParam, IRawElementProviderSimple el) { return RawUiaReturnRawElementProvider( hwnd, wParam, lParam, el ); } ////// Critical: This code calls into the unmanaged UIAutomationCore.dll /// TreatAsSafe: This converts an hwnd to a MiniHwndProxy, which while technically implementing IRawElementProviderSimple, has none of the functionality /// and is therefore simply a harmless hwnd container. /// [SecurityCritical,SecurityTreatAsSafe] internal static IRawElementProviderSimple UiaHostProviderFromHwnd(IntPtr hwnd) { IRawElementProviderSimple provider; CheckError(RawUiaHostProviderFromHwnd(hwnd, out provider)); return provider; } #endregion Provider methods // // Event methods (client and provider) // #region Event methods ////// Critical: This code calls into the unmanaged UIAutomationCore.dll /// TreatAsSafe: Causes an AutomationEvent to fire, requires a functional IRawElementProvider, so cannot even be used to spoof events from other AutomationElements. /// [SecurityCritical,SecurityTreatAsSafe] internal static void UiaRaiseAutomationPropertyChangedEvent(IRawElementProviderSimple provider, int propertyId, object oldValue, object newValue) { CheckError(RawUiaRaiseAutomationPropertyChangedEvent(provider, propertyId, oldValue, newValue)); } ////// Critical: This code calls into the unmanaged UIAutomationCore.dll /// TreatAsSafe: Causes an AutomationEvent to fire, requires a functional IRawElementProvider, so cannot even be used to spoof events from other AutomationElements. /// [SecurityCritical,SecurityTreatAsSafe] internal static void UiaRaiseAutomationEvent(IRawElementProviderSimple provider, int eventId) { CheckError(RawUiaRaiseAutomationEvent(provider, eventId)); } ////// Critical: This code calls into the unmanaged UIAutomationCore.dll /// TreatAsSafe: Causes an AutomationEvent to fire, requires a functional IRawElementProvider, so cannot even be used to spoof events from other AutomationElements. /// [SecurityCritical,SecurityTreatAsSafe] internal static void UiaRaiseStructureChangedEvent(IRawElementProviderSimple provider, StructureChangeType structureChangeType, int[] runtimeId) { CheckError(RawUiaRaiseStructureChangedEvent(provider, structureChangeType, runtimeId, runtimeId == null ? 0 : runtimeId.Length)); } ////// Critical: This code calls into the unmanaged UIAutomationCore.dll /// TreatAsSafe: Causes an AutomationEvent to fire, requires a functional IRawElementProvider, so cannot even be used to spoof events from other AutomationElements. /// [SecurityCritical,SecurityTreatAsSafe] internal static void UiaRaiseAsyncContentLoadedEvent(IRawElementProviderSimple provider, AsyncContentLoadedState asyncContentLoadedState, double PercentComplete) { CheckError(RawUiaRaiseAsyncContentLoadedEvent(provider, asyncContentLoadedState, PercentComplete)); } ////// Critical: This code calls into the unmanaged UIAutomationCore.dll /// TreatAsSafe: Simply checks whether clients are listening in order to know whether to fire AutomationEvents. This is information we WANT available to /// Partial Trust users, so is not an information disclosure risk. /// [SecurityCritical,SecurityTreatAsSafe] internal static bool UiaClientsAreListening() { return RawUiaClientsAreListening(); } #endregion Event methods #endregion Internal Methods //------------------------------------------------------ // // Private Methods // //----------------------------------------------------- #region Private Methods // Check hresult for error... private static void CheckError(int hr) { if (hr >= 0) { return; } Marshal.ThrowExceptionForHR(hr); } #endregion Private Methods #region Raw API methods // // Provider-side methods... // [SecurityCritical] [SuppressUnmanagedCodeSecurity] [DllImport(DllImport.UIAutomationCore, EntryPoint = "UiaReturnRawElementProvider", CharSet = CharSet.Unicode)] private static extern IntPtr RawUiaReturnRawElementProvider(IntPtr hwnd, IntPtr wParam, IntPtr lParam, IRawElementProviderSimple el); [SecurityCritical] [SuppressUnmanagedCodeSecurity] [DllImport(DllImport.UIAutomationCore, EntryPoint = "UiaHostProviderFromHwnd", CharSet = CharSet.Unicode)] private static extern int RawUiaHostProviderFromHwnd(IntPtr hwnd, [MarshalAs(UnmanagedType.Interface)] out IRawElementProviderSimple provider); // Event APIs... [SecurityCritical] [SuppressUnmanagedCodeSecurity] [DllImport(DllImport.UIAutomationCore, EntryPoint = "UiaRaiseAutomationPropertyChangedEvent", CharSet = CharSet.Unicode)] private static extern int RawUiaRaiseAutomationPropertyChangedEvent(IRawElementProviderSimple provider, int id, object oldValue, object newValue); [SecurityCritical] [SuppressUnmanagedCodeSecurity] [DllImport(DllImport.UIAutomationCore, EntryPoint = "UiaRaiseAutomationEvent", CharSet = CharSet.Unicode)] private static extern int RawUiaRaiseAutomationEvent(IRawElementProviderSimple provider, int id); [SecurityCritical] [SuppressUnmanagedCodeSecurity] [DllImport(DllImport.UIAutomationCore, EntryPoint = "UiaRaiseStructureChangedEvent", CharSet = CharSet.Unicode)] private static extern int RawUiaRaiseStructureChangedEvent(IRawElementProviderSimple provider, StructureChangeType structureChangeType, int[] runtimeId, int runtimeIdLen); [SecurityCritical] [SuppressUnmanagedCodeSecurity] [DllImport(DllImport.UIAutomationCore, EntryPoint = "UiaRaiseAsyncContentLoadedEvent", CharSet = CharSet.Unicode)] private static extern int RawUiaRaiseAsyncContentLoadedEvent(IRawElementProviderSimple provider, AsyncContentLoadedState asyncContentLoadedState, double PercentComplete); [SecurityCritical] [SuppressUnmanagedCodeSecurity] [DllImport(DllImport.UIAutomationCore, EntryPoint = "UiaClientsAreListening", CharSet = CharSet.Unicode)] private static extern bool RawUiaClientsAreListening(); #endregion Raw API methods } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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