UiaCoreProviderApi.cs source code in C# .NET

                        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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