Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / Media / SafeMILHandle.cs / 1 / SafeMILHandle.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // // Description: // A safe way to deal with unmanaged MIL interface pointers. //--------------------------------------------------------------------------- using System; using System.IO; using System.Security; using System.Security.Permissions; using System.Collections; using System.Reflection; using MS.Internal; using MS.Win32; using System.Diagnostics; using System.Windows.Media; using System.Runtime.InteropServices; using System.Runtime.CompilerServices; using Microsoft.Win32.SafeHandles; using UnsafeNativeMethods=MS.Win32.PresentationCore.UnsafeNativeMethods; namespace System.Windows.Media { internal class SafeMILHandle : SafeHandleZeroOrMinusOneIsInvalid { ////// Use this constructor if the handle isn't ready yet and later /// set the handle with SetHandle. SafeMILHandle owns the release /// of the handle. /// ////// Critical: This derives from a class that has a link demand and inheritance demand /// TreatAsSafe: Ok to call constructor /// [SecurityCritical,SecurityTreatAsSafe] internal SafeMILHandle() : base(true) { } ////// Use this constructor if the handle exists at construction time. /// SafeMILHandle owns the release of the parameter. /// ////// Critical: This code calls UpdateEstimatedSize. /// It is used to keep memory around /// [SecurityCritical] internal SafeMILHandle(IntPtr handle, long estimatedSize) : base(true) { SetHandle(handle); // // Hint the GC at the size of the unmanaged memory associated with // this object. We release pressure in the finalizer. // UpdateEstimatedSize(estimatedSize); } ////// Change our size to the new size specified /// ////// Critical: This code calls into AddMemoryPressure and RemoveMemoryPressure /// both of which have link demands. It is used to keep memory around /// [SecurityCritical] internal void UpdateEstimatedSize(long estimatedSize) { if (_gcPressure > 0) { MemoryPressure.Remove(_gcPressure); } _gcPressure = estimatedSize; if (_gcPressure > 0) { MemoryPressure.Add(_gcPressure); } } ////// Critical - calls unmanaged code, not treat as safe because you must /// validate that handle is a valid COM object. /// [SecurityCritical] protected override bool ReleaseHandle() { UnsafeNativeMethods.MILUnknown.ReleaseInterface(ref handle); // // We've released the unmanaged memory, so remove associated // GC pressure. // UpdateEstimatedSize(0); return true; } // // Estimated size in bytes of the unmanaged memory we are holding onto // private long _gcPressure; } } // 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
- OracleRowUpdatedEventArgs.cs
- CellConstant.cs
- SuppressIldasmAttribute.cs
- SmtpDigestAuthenticationModule.cs
- RNGCryptoServiceProvider.cs
- XamlSerializerUtil.cs
- Root.cs
- ServiceBuildProvider.cs
- HtmlAnchor.cs
- EDesignUtil.cs
- DbConnectionPoolIdentity.cs
- OleDbErrorCollection.cs
- XamlStackWriter.cs
- GenericTypeParameterBuilder.cs
- MeasureData.cs
- Int32CAMarshaler.cs
- ProviderCommandInfoUtils.cs
- X509Certificate2.cs
- FreezableCollection.cs
- DataMisalignedException.cs
- UnsafeNativeMethodsCLR.cs
- DataGridRow.cs
- SortFieldComparer.cs
- PanelStyle.cs
- MaskedTextBoxTextEditor.cs
- CharAnimationBase.cs
- PrinterResolution.cs
- AlternateViewCollection.cs
- Vector3DKeyFrameCollection.cs
- WebServiceBindingAttribute.cs
- RSAOAEPKeyExchangeDeformatter.cs
- WebPartHelpVerb.cs
- HelpEvent.cs
- ObjectView.cs
- ProtocolsInstallComponent.cs
- BamlVersionHeader.cs
- xml.cs
- EntityDataSourceChangingEventArgs.cs
- FigureParagraph.cs
- ValueProviderWrapper.cs
- EventLogPermissionEntryCollection.cs
- PropertyStore.cs
- Perspective.cs
- WebExceptionStatus.cs
- DoneReceivingAsyncResult.cs
- ResXBuildProvider.cs
- DispatchChannelSink.cs
- XPathDocumentIterator.cs
- DataContractSerializerOperationBehavior.cs
- Baml2006SchemaContext.cs
- DrawingGroupDrawingContext.cs
- DesignerCategoryAttribute.cs
- SqlProviderServices.cs
- TargetControlTypeAttribute.cs
- WebMessageEncodingElement.cs
- PropertyChangedEventArgs.cs
- ImageButton.cs
- DataGridColumnHeadersPresenter.cs
- BevelBitmapEffect.cs
- ZipPackagePart.cs
- MatrixAnimationUsingKeyFrames.cs
- MexTcpBindingCollectionElement.cs
- RepeaterItem.cs
- EventProviderWriter.cs
- HtmlControl.cs
- MailMessageEventArgs.cs
- AssemblyBuilder.cs
- RSAPKCS1KeyExchangeFormatter.cs
- InteropBitmapSource.cs
- EntryWrittenEventArgs.cs
- RectangleConverter.cs
- ColumnReorderedEventArgs.cs
- SelectionItemPattern.cs
- ClientProxyGenerator.cs
- WorkflowViewStateService.cs
- OwnerDrawPropertyBag.cs
- XmlnsDictionary.cs
- DefaultParameterValueAttribute.cs
- ChooseAction.cs
- mediaclock.cs
- UpdatePanelTrigger.cs
- BaseTemplateCodeDomTreeGenerator.cs
- DataObjectMethodAttribute.cs
- SettingsPropertyValueCollection.cs
- PreviewPrintController.cs
- BlurEffect.cs
- SQLInt64Storage.cs
- NameValueConfigurationCollection.cs
- ConfigXmlWhitespace.cs
- VariableBinder.cs
- WebRequestModuleElement.cs
- TraceProvider.cs
- WebPartDescription.cs
- Renderer.cs
- MessageQueueTransaction.cs
- CodePrimitiveExpression.cs
- ListDesigner.cs
- HtmlTableCellCollection.cs
- GeneralTransform3DGroup.cs
- GeneralTransform.cs