Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / Orcas / NetFXw7 / wpf / src / Framework / System / Windows / Documents / WinEventHandler.cs / 1 / WinEventHandler.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // // Description: WinEventHandler implementation. // // History: // 02/04/2005 : yutakas - created. // //--------------------------------------------------------------------------- using System; using System.Collections; using System.Runtime.InteropServices; using System.ComponentModel; using System.Diagnostics; using System.Security; using System.Security.Permissions; using System.Windows.Threading; using MS.Win32; using MS.Internal; namespace System.Windows.Documents { internal class WinEventHandler : IDisposable { //----------------------------------------------------- // // Constructors // //----------------------------------------------------- #region Constructors // ctor that takes a range of events ////// Critical - as this calls the setter for _winEventProc.Value. /// Safe - as this doesn't allow an arbitrary value to be set. /// [SecurityCritical, SecurityTreatAsSafe] internal WinEventHandler(int eventMin, int eventMax) { _eventMin = eventMin; _eventMax = eventMax; _winEventProc.Value = new NativeMethods.WinEventProcDef(WinEventDefaultProc); // Keep the garbage collector from moving things around _gchThis = GCHandle.Alloc(_winEventProc.Value); // Workaround for bug 150666. Dispatcher dispatcher = Dispatcher.CurrentDispatcher; if (dispatcher != null) { dispatcher.ShutdownFinished += new EventHandler(OnDispatcherShutDown); } } ~WinEventHandler() { Clear(); } #endregion Constructors //------------------------------------------------------ // // Internal Methods // //----------------------------------------------------- #region Internal Methods public void Dispose() { // no need to call this finalizer. GC.SuppressFinalize(this); Clear(); } // callback for the class inherited from this. internal virtual void WinEventProc(int eventId, IntPtr hwnd) { } ////// Critical: This code frees the gchandle and is critical because it calls GCHandle /// TreatAsSafe: Ok to call free on a handle that we have allocated /// [SecurityCritical,SecurityTreatAsSafe] internal void Clear() { // Make sure that the hooks is uninitialzied. Stop(); // free GC handle. if (_gchThis.IsAllocated) { _gchThis.Free(); } } // install WinEvent hook and start getting the callback. ////// Critical - as this calls SetWinEventHook which has a SUC on it and also calls /// the setter for _hHook. /// Safe - as this does not allow an arbitrary method to be set up as a hook and /// also doesn't allow an aribtrary value to be set on _hHook.Value. /// [SecurityCritical, SecurityTreatAsSafe] internal void Start() { if (_gchThis.IsAllocated) { _hHook.Value = UnsafeNativeMethods.SetWinEventHook(_eventMin, _eventMax, IntPtr.Zero, _winEventProc.Value, 0, 0, NativeMethods.WINEVENT_OUTOFCONTEXT); if (_hHook.Value == IntPtr.Zero ) { Stop(); } } } // uninstall WinEvent hook. ////// Critical - as this calls UnhookWinEvent which has a SUC on it and also /// calls the setter for _hHook.Value. /// Safe - as this does not allow an arbitrary hook to be removed and sets /// _hHook.Value to IntPtr.Zero which is safe. /// [SecurityCritical, SecurityTreatAsSafe] internal void Stop() { if (_hHook.Value != IntPtr.Zero ) { UnsafeNativeMethods.UnhookWinEvent(_hHook.Value); _hHook.Value = IntPtr.Zero ; } } #endregion Internal Methods //------------------------------------------------------ // // Private Methods // //------------------------------------------------------ #region Private Methods private void WinEventDefaultProc(int winEventHook, int eventId, IntPtr hwnd, int idObject, int idChild, int eventThread, int eventTime) { WinEventProc(eventId , hwnd); } // Workaround for bug 150666. private void OnDispatcherShutDown(object sender, EventArgs args) { Stop(); } #endregion Private Methods //----------------------------------------------------- // // Private Fields // //------------------------------------------------------ #region Private Fields // min WinEvent. private int _eventMin; // max WinEvent. private int _eventMax; // hook handle private SecurityCriticalDataForSet_hHook; // the callback. private SecurityCriticalDataForSet _winEventProc; // GCHandle to keep the garbage collector from moving things around private GCHandle _gchThis; #endregion Private Fields } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved. //---------------------------------------------------------------------------- // // // Copyright (C) Microsoft Corporation. All rights reserved. // // // // Description: WinEventHandler implementation. // // History: // 02/04/2005 : yutakas - created. // //--------------------------------------------------------------------------- using System; using System.Collections; using System.Runtime.InteropServices; using System.ComponentModel; using System.Diagnostics; using System.Security; using System.Security.Permissions; using System.Windows.Threading; using MS.Win32; using MS.Internal; namespace System.Windows.Documents { internal class WinEventHandler : IDisposable { //----------------------------------------------------- // // Constructors // //----------------------------------------------------- #region Constructors // ctor that takes a range of events ////// Critical - as this calls the setter for _winEventProc.Value. /// Safe - as this doesn't allow an arbitrary value to be set. /// [SecurityCritical, SecurityTreatAsSafe] internal WinEventHandler(int eventMin, int eventMax) { _eventMin = eventMin; _eventMax = eventMax; _winEventProc.Value = new NativeMethods.WinEventProcDef(WinEventDefaultProc); // Keep the garbage collector from moving things around _gchThis = GCHandle.Alloc(_winEventProc.Value); // Workaround for bug 150666. Dispatcher dispatcher = Dispatcher.CurrentDispatcher; if (dispatcher != null) { dispatcher.ShutdownFinished += new EventHandler(OnDispatcherShutDown); } } ~WinEventHandler() { Clear(); } #endregion Constructors //------------------------------------------------------ // // Internal Methods // //----------------------------------------------------- #region Internal Methods public void Dispose() { // no need to call this finalizer. GC.SuppressFinalize(this); Clear(); } // callback for the class inherited from this. internal virtual void WinEventProc(int eventId, IntPtr hwnd) { } ////// Critical: This code frees the gchandle and is critical because it calls GCHandle /// TreatAsSafe: Ok to call free on a handle that we have allocated /// [SecurityCritical,SecurityTreatAsSafe] internal void Clear() { // Make sure that the hooks is uninitialzied. Stop(); // free GC handle. if (_gchThis.IsAllocated) { _gchThis.Free(); } } // install WinEvent hook and start getting the callback. ////// Critical - as this calls SetWinEventHook which has a SUC on it and also calls /// the setter for _hHook. /// Safe - as this does not allow an arbitrary method to be set up as a hook and /// also doesn't allow an aribtrary value to be set on _hHook.Value. /// [SecurityCritical, SecurityTreatAsSafe] internal void Start() { if (_gchThis.IsAllocated) { _hHook.Value = UnsafeNativeMethods.SetWinEventHook(_eventMin, _eventMax, IntPtr.Zero, _winEventProc.Value, 0, 0, NativeMethods.WINEVENT_OUTOFCONTEXT); if (_hHook.Value == IntPtr.Zero ) { Stop(); } } } // uninstall WinEvent hook. ////// Critical - as this calls UnhookWinEvent which has a SUC on it and also /// calls the setter for _hHook.Value. /// Safe - as this does not allow an arbitrary hook to be removed and sets /// _hHook.Value to IntPtr.Zero which is safe. /// [SecurityCritical, SecurityTreatAsSafe] internal void Stop() { if (_hHook.Value != IntPtr.Zero ) { UnsafeNativeMethods.UnhookWinEvent(_hHook.Value); _hHook.Value = IntPtr.Zero ; } } #endregion Internal Methods //------------------------------------------------------ // // Private Methods // //------------------------------------------------------ #region Private Methods private void WinEventDefaultProc(int winEventHook, int eventId, IntPtr hwnd, int idObject, int idChild, int eventThread, int eventTime) { WinEventProc(eventId , hwnd); } // Workaround for bug 150666. private void OnDispatcherShutDown(object sender, EventArgs args) { Stop(); } #endregion Private Methods //----------------------------------------------------- // // Private Fields // //------------------------------------------------------ #region Private Fields // min WinEvent. private int _eventMin; // max WinEvent. private int _eventMax; // hook handle private SecurityCriticalDataForSet_hHook; // the callback. private SecurityCriticalDataForSet _winEventProc; // GCHandle to keep the garbage collector from moving things around private GCHandle _gchThis; #endregion Private Fields } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- CircleHotSpot.cs
- PointCollection.cs
- SafeNativeMemoryHandle.cs
- DataColumnMapping.cs
- _SSPIWrapper.cs
- ValidatorCompatibilityHelper.cs
- UrlPropertyAttribute.cs
- X509SubjectKeyIdentifierClause.cs
- TCEAdapterGenerator.cs
- XPathNavigatorReader.cs
- IDictionary.cs
- ProviderSettings.cs
- CalendarTable.cs
- IncrementalHitTester.cs
- SessionStateSection.cs
- ParameterCollection.cs
- SystemSounds.cs
- XmlSchemaIdentityConstraint.cs
- connectionpool.cs
- WebBrowserBase.cs
- PageBuildProvider.cs
- GeometryHitTestParameters.cs
- GridItem.cs
- RoleServiceManager.cs
- SqlExpressionNullability.cs
- UseLicense.cs
- StylusPointPropertyUnit.cs
- Calendar.cs
- ContextItemManager.cs
- TracedNativeMethods.cs
- SqlServer2KCompatibilityAnnotation.cs
- GenericArgumentsUpdater.cs
- MutexSecurity.cs
- Condition.cs
- BitmapInitialize.cs
- CharacterMetricsDictionary.cs
- ClassValidator.cs
- CodeVariableDeclarationStatement.cs
- VirtualPath.cs
- DataViewManager.cs
- TextViewBase.cs
- DSASignatureFormatter.cs
- ConstraintEnumerator.cs
- FormViewPageEventArgs.cs
- ping.cs
- BaseCodePageEncoding.cs
- CategoryGridEntry.cs
- SafeFileMappingHandle.cs
- MetadataCache.cs
- StylusDevice.cs
- DataRowCollection.cs
- ExpressionBuilder.cs
- HttpModulesSection.cs
- UnlockCardRequest.cs
- ProcessRequestArgs.cs
- Preprocessor.cs
- MulticastNotSupportedException.cs
- SystemInfo.cs
- XPathException.cs
- SchemaType.cs
- TextBoxAutomationPeer.cs
- LinkLabelLinkClickedEvent.cs
- WebPartHeaderCloseVerb.cs
- WindowsFormsSynchronizationContext.cs
- COM2IDispatchConverter.cs
- ListBoxChrome.cs
- EventDescriptor.cs
- TaiwanLunisolarCalendar.cs
- HtmlTable.cs
- SettingsPropertyIsReadOnlyException.cs
- AsyncPostBackTrigger.cs
- RadialGradientBrush.cs
- ThreadStaticAttribute.cs
- XmlUtil.cs
- DecoderBestFitFallback.cs
- XmlAttributeOverrides.cs
- Rights.cs
- ExtensionDataObject.cs
- XPathNavigatorReader.cs
- MarginsConverter.cs
- Model3DCollection.cs
- SmtpReplyReader.cs
- ChtmlTextBoxAdapter.cs
- Delegate.cs
- CustomError.cs
- AnimationStorage.cs
- ProxyHelper.cs
- WindowsStatic.cs
- DelayedRegex.cs
- BitStream.cs
- DataGridViewRowPostPaintEventArgs.cs
- CompositeTypefaceMetrics.cs
- BaseCodeDomTreeGenerator.cs
- RawStylusInputCustomDataList.cs
- InputQueue.cs
- ConstructorBuilder.cs
- DataControlButton.cs
- SessionStateUtil.cs
- QilNode.cs
- SqlMethods.cs