Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / wpf / src / Core / CSharp / System / Windows / Media / EventProxy.cs / 1 / EventProxy.cs
//------------------------------------------------------------------------------ // Microsoft Avalon // Copyright (c) Microsoft Corporation, 2003 // // File: eventproxy.cs //----------------------------------------------------------------------------- #pragma warning disable 1634, 1691 // Allow suppression of certain presharp messages using System.Windows.Media; using System; using MS.Internal; using MS.Win32; using System.Reflection; using System.Collections; using System.Diagnostics; using System.Security; using System.Security.Permissions; using System.Runtime.InteropServices; using Microsoft.Internal; using MS.Internal.PresentationCore; // TODOTODO Make our own namespace for internal stuff. namespace System.Windows.Media { #region EventProxyDescriptor [StructLayout(LayoutKind.Sequential)] internal struct EventProxyDescriptor { internal delegate void Dispose( ref EventProxyDescriptor pEPD ); internal delegate int RaiseEvent( ref EventProxyDescriptor pEPD, [MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 2)] byte[] buffer, uint cb ); internal Dispose pfnDispose; internal RaiseEvent pfnRaiseEvent; ////// Critical: calls GCHandle.get_Target which LinkDemands /// TreatAsSafe: can't pass in an arbitrary class, only EventProxyDescriptor. Also, it's OK to dispose this. /// [SecurityCritical, SecurityTreatAsSafe] internal static void StaticDispose(ref EventProxyDescriptor pEPD) { Debug.Assert(((IntPtr)pEPD.m_handle) != IntPtr.Zero, "If this asserts fires: Why is it firing? It might be legal in future."); EventProxyWrapper epw = (EventProxyWrapper)(pEPD.m_handle.Target); ((System.Runtime.InteropServices.GCHandle)(pEPD.m_handle)).Free(); } internal System.Runtime.InteropServices.GCHandle m_handle; } #endregion #region EventProxyStaticPtrs ////// We need to keep the delegates alive. /// internal static class EventProxyStaticPtrs { static EventProxyStaticPtrs() { EventProxyStaticPtrs.pfnDispose = new EventProxyDescriptor.Dispose(EventProxyDescriptor.StaticDispose); EventProxyStaticPtrs.pfnRaiseEvent = new EventProxyDescriptor.RaiseEvent(EventProxyWrapper.RaiseEvent); } internal static EventProxyDescriptor.Dispose pfnDispose; internal static EventProxyDescriptor.RaiseEvent pfnRaiseEvent; } #endregion #region EventProxyWrapper ////// Event proxy wrapper will relay events from unmanaged code to managed code /// internal class EventProxyWrapper { private WeakReference target; #region Constructor private EventProxyWrapper(IInvokable invokable) { target = new WeakReference(invokable); } #endregion #region Verify private void Verify() { if (target == null) { throw new System.ObjectDisposedException("EventProxyWrapper"); } } #endregion #region Public methods ////// Critical: calls Marshal.GetHRForException which LinkDemands /// TreatAsSafe: ok to return an hresult in partial trust /// [SecurityCritical, SecurityTreatAsSafe] public int RaiseEvent(byte[] buffer, uint cb) { #pragma warning disable 6500 try { Verify(); IInvokable invokable = (IInvokable)target.Target; if (invokable != null) { invokable.RaiseEvent(buffer, (int)cb); } else { // return E_HANDLE to notify that object is no longer alive return NativeMethods.E_HANDLE; } } catch (Exception e) { return Marshal.GetHRForException(e); } #pragma warning restore 6500 return NativeMethods.S_OK; } #endregion #region Delegate Implemetations ////// Critical: This code calls into handle to get Target which has a link demand /// TreatAsSafe: EventProxyWrapper is safe to expose /// [SecurityCritical,SecurityTreatAsSafe] internal static EventProxyWrapper FromEPD(ref EventProxyDescriptor epd) { Debug.Assert(((IntPtr)epd.m_handle) != IntPtr.Zero, "Stream is disposed."); System.Runtime.InteropServices.GCHandle handle = (System.Runtime.InteropServices.GCHandle)(epd.m_handle); return (EventProxyWrapper)(handle.Target); } internal static int RaiseEvent(ref EventProxyDescriptor pEPD, byte[] buffer, uint cb) { EventProxyWrapper target = EventProxyWrapper.FromEPD(ref pEPD); if (target != null) { return target.RaiseEvent(buffer, cb); } else { return NativeMethods.E_HANDLE; } } #endregion #region Static Create Method(s) ////// Critical: This code hooks up event sinks for unmanaged events /// It also calls into a native method via MILCreateEventProxy /// [SecurityCritical] internal static SafeMILHandle CreateEventProxyWrapper(IInvokable invokable) { if (invokable == null) { throw new System.ArgumentNullException("invokable"); } SafeMILHandle eventProxy = null; EventProxyWrapper epw = new EventProxyWrapper(invokable); EventProxyDescriptor epd = new EventProxyDescriptor(); epd.pfnDispose = EventProxyStaticPtrs.pfnDispose; epd.pfnRaiseEvent = EventProxyStaticPtrs.pfnRaiseEvent; epd.m_handle = System.Runtime.InteropServices.GCHandle.Alloc(epw, System.Runtime.InteropServices.GCHandleType.Normal); HRESULT.Check(MILCreateEventProxy(ref epd, out eventProxy)); return eventProxy; } #endregion ////// Critical: Elevates to unmanaged code permission /// [SuppressUnmanagedCodeSecurity] [SecurityCritical] [DllImport(DllImport.MilCore)] private extern static int /* HRESULT */ MILCreateEventProxy(ref EventProxyDescriptor pEPD, out SafeMILHandle ppEventProxy); } #endregion } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved. //------------------------------------------------------------------------------ // Microsoft Avalon // Copyright (c) Microsoft Corporation, 2003 // // File: eventproxy.cs //----------------------------------------------------------------------------- #pragma warning disable 1634, 1691 // Allow suppression of certain presharp messages using System.Windows.Media; using System; using MS.Internal; using MS.Win32; using System.Reflection; using System.Collections; using System.Diagnostics; using System.Security; using System.Security.Permissions; using System.Runtime.InteropServices; using Microsoft.Internal; using MS.Internal.PresentationCore; // TODOTODO Make our own namespace for internal stuff. namespace System.Windows.Media { #region EventProxyDescriptor [StructLayout(LayoutKind.Sequential)] internal struct EventProxyDescriptor { internal delegate void Dispose( ref EventProxyDescriptor pEPD ); internal delegate int RaiseEvent( ref EventProxyDescriptor pEPD, [MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 2)] byte[] buffer, uint cb ); internal Dispose pfnDispose; internal RaiseEvent pfnRaiseEvent; ////// Critical: calls GCHandle.get_Target which LinkDemands /// TreatAsSafe: can't pass in an arbitrary class, only EventProxyDescriptor. Also, it's OK to dispose this. /// [SecurityCritical, SecurityTreatAsSafe] internal static void StaticDispose(ref EventProxyDescriptor pEPD) { Debug.Assert(((IntPtr)pEPD.m_handle) != IntPtr.Zero, "If this asserts fires: Why is it firing? It might be legal in future."); EventProxyWrapper epw = (EventProxyWrapper)(pEPD.m_handle.Target); ((System.Runtime.InteropServices.GCHandle)(pEPD.m_handle)).Free(); } internal System.Runtime.InteropServices.GCHandle m_handle; } #endregion #region EventProxyStaticPtrs ////// We need to keep the delegates alive. /// internal static class EventProxyStaticPtrs { static EventProxyStaticPtrs() { EventProxyStaticPtrs.pfnDispose = new EventProxyDescriptor.Dispose(EventProxyDescriptor.StaticDispose); EventProxyStaticPtrs.pfnRaiseEvent = new EventProxyDescriptor.RaiseEvent(EventProxyWrapper.RaiseEvent); } internal static EventProxyDescriptor.Dispose pfnDispose; internal static EventProxyDescriptor.RaiseEvent pfnRaiseEvent; } #endregion #region EventProxyWrapper ////// Event proxy wrapper will relay events from unmanaged code to managed code /// internal class EventProxyWrapper { private WeakReference target; #region Constructor private EventProxyWrapper(IInvokable invokable) { target = new WeakReference(invokable); } #endregion #region Verify private void Verify() { if (target == null) { throw new System.ObjectDisposedException("EventProxyWrapper"); } } #endregion #region Public methods ////// Critical: calls Marshal.GetHRForException which LinkDemands /// TreatAsSafe: ok to return an hresult in partial trust /// [SecurityCritical, SecurityTreatAsSafe] public int RaiseEvent(byte[] buffer, uint cb) { #pragma warning disable 6500 try { Verify(); IInvokable invokable = (IInvokable)target.Target; if (invokable != null) { invokable.RaiseEvent(buffer, (int)cb); } else { // return E_HANDLE to notify that object is no longer alive return NativeMethods.E_HANDLE; } } catch (Exception e) { return Marshal.GetHRForException(e); } #pragma warning restore 6500 return NativeMethods.S_OK; } #endregion #region Delegate Implemetations ////// Critical: This code calls into handle to get Target which has a link demand /// TreatAsSafe: EventProxyWrapper is safe to expose /// [SecurityCritical,SecurityTreatAsSafe] internal static EventProxyWrapper FromEPD(ref EventProxyDescriptor epd) { Debug.Assert(((IntPtr)epd.m_handle) != IntPtr.Zero, "Stream is disposed."); System.Runtime.InteropServices.GCHandle handle = (System.Runtime.InteropServices.GCHandle)(epd.m_handle); return (EventProxyWrapper)(handle.Target); } internal static int RaiseEvent(ref EventProxyDescriptor pEPD, byte[] buffer, uint cb) { EventProxyWrapper target = EventProxyWrapper.FromEPD(ref pEPD); if (target != null) { return target.RaiseEvent(buffer, cb); } else { return NativeMethods.E_HANDLE; } } #endregion #region Static Create Method(s) ////// Critical: This code hooks up event sinks for unmanaged events /// It also calls into a native method via MILCreateEventProxy /// [SecurityCritical] internal static SafeMILHandle CreateEventProxyWrapper(IInvokable invokable) { if (invokable == null) { throw new System.ArgumentNullException("invokable"); } SafeMILHandle eventProxy = null; EventProxyWrapper epw = new EventProxyWrapper(invokable); EventProxyDescriptor epd = new EventProxyDescriptor(); epd.pfnDispose = EventProxyStaticPtrs.pfnDispose; epd.pfnRaiseEvent = EventProxyStaticPtrs.pfnRaiseEvent; epd.m_handle = System.Runtime.InteropServices.GCHandle.Alloc(epw, System.Runtime.InteropServices.GCHandleType.Normal); HRESULT.Check(MILCreateEventProxy(ref epd, out eventProxy)); return eventProxy; } #endregion ////// Critical: Elevates to unmanaged code permission /// [SuppressUnmanagedCodeSecurity] [SecurityCritical] [DllImport(DllImport.MilCore)] private extern static int /* HRESULT */ MILCreateEventProxy(ref EventProxyDescriptor pEPD, out SafeMILHandle ppEventProxy); } #endregion } // 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
- StructuredCompositeActivityDesigner.cs
- RenamedEventArgs.cs
- handlecollector.cs
- RepeatInfo.cs
- DataGridRelationshipRow.cs
- RequestCacheValidator.cs
- MarkupCompiler.cs
- RuntimeConfig.cs
- ServiceMetadataPublishingElement.cs
- ListBox.cs
- ToolBarDesigner.cs
- ClientRuntimeConfig.cs
- WebResourceUtil.cs
- sitestring.cs
- RTLAwareMessageBox.cs
- TypeHelper.cs
- ProfileGroupSettingsCollection.cs
- GPPOINTF.cs
- UserNamePasswordValidator.cs
- SQLBinaryStorage.cs
- ImageSource.cs
- SmtpException.cs
- DataObjectEventArgs.cs
- DoubleStorage.cs
- SharingService.cs
- SqlCommandSet.cs
- SequenceDesignerAccessibleObject.cs
- ReflectionUtil.cs
- OdbcConnectionString.cs
- PasswordRecoveryDesigner.cs
- LoadItemsEventArgs.cs
- RSACryptoServiceProvider.cs
- ExpandedProjectionNode.cs
- SafeIUnknown.cs
- SystemInfo.cs
- SubordinateTransaction.cs
- MessageBox.cs
- DBCommandBuilder.cs
- ToolboxComponentsCreatingEventArgs.cs
- FontUnitConverter.cs
- SolidBrush.cs
- RubberbandSelector.cs
- COM2IVsPerPropertyBrowsingHandler.cs
- DataGridRowAutomationPeer.cs
- LogicalExpressionTypeConverter.cs
- TextTabProperties.cs
- CodeGroup.cs
- ActivityExecutionContext.cs
- ConfigDefinitionUpdates.cs
- ResourceContainer.cs
- ExpressionBuilderCollection.cs
- ThreadPoolTaskScheduler.cs
- TimeSpanConverter.cs
- DescendentsWalkerBase.cs
- AdditionalEntityFunctions.cs
- DispatchChannelSink.cs
- ISO2022Encoding.cs
- IndexedString.cs
- DeclarativeCatalogPart.cs
- FullTextLine.cs
- Geometry.cs
- ExecutionContext.cs
- XamlValidatingReader.cs
- ActivationArguments.cs
- LinqDataSourceDisposeEventArgs.cs
- SamlAttributeStatement.cs
- DocumentEventArgs.cs
- BlurBitmapEffect.cs
- DispatchChannelSink.cs
- Rules.cs
- Image.cs
- DbException.cs
- WebConfigurationManager.cs
- XmlCodeExporter.cs
- HttpContextWrapper.cs
- WorkflowInlining.cs
- PerfCounters.cs
- TimeManager.cs
- DecimalAnimation.cs
- MenuAutomationPeer.cs
- ImplicitInputBrush.cs
- WebHttpSecurity.cs
- PriorityChain.cs
- DataGridViewImageCell.cs
- WorkerRequest.cs
- DataConnectionHelper.cs
- EventData.cs
- Viewport2DVisual3D.cs
- CodeBinaryOperatorExpression.cs
- SamlAuthenticationClaimResource.cs
- InputLangChangeRequestEvent.cs
- SearchForVirtualItemEventArgs.cs
- SqlProfileProvider.cs
- FlowLayout.cs
- DataServiceRequestOfT.cs
- MetadataArtifactLoaderComposite.cs
- StringUtil.cs
- Image.cs
- TypeInformation.cs
- SelfIssuedAuthProofToken.cs