Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / wpf / src / Core / CSharp / System / Windows / Media / SafeMILHandle.cs / 2 / 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; using System.Runtime.InteropServices; using System.Runtime.CompilerServices; using Microsoft.Win32.SafeHandles; using Microsoft.Internal; 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 unmangaed 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. //---------------------------------------------------------------------------- // //// 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; using System.Runtime.InteropServices; using System.Runtime.CompilerServices; using Microsoft.Win32.SafeHandles; using Microsoft.Internal; 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 unmangaed 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
- MultiTrigger.cs
- DiscreteKeyFrames.cs
- xmlformatgeneratorstatics.cs
- ClientUrlResolverWrapper.cs
- DbException.cs
- JsonSerializer.cs
- TabRenderer.cs
- HttpResponseInternalWrapper.cs
- GeneralTransform3D.cs
- LayoutEvent.cs
- MasterPageCodeDomTreeGenerator.cs
- CellConstant.cs
- TitleStyle.cs
- SqlBinder.cs
- GridView.cs
- Policy.cs
- FacetEnabledSchemaElement.cs
- EventLogSession.cs
- XAMLParseException.cs
- TrackingValidationObjectDictionary.cs
- FillBehavior.cs
- ErrorWrapper.cs
- SchemaTypeEmitter.cs
- TextViewBase.cs
- EntityViewGenerationConstants.cs
- TextDecoration.cs
- PenLineJoinValidation.cs
- DSACryptoServiceProvider.cs
- TemplateEditingVerb.cs
- InputLanguageSource.cs
- XmlSchemaAnyAttribute.cs
- ReliableChannelFactory.cs
- PermissionSet.cs
- ContextStaticAttribute.cs
- CompoundFileReference.cs
- GenericArgumentsUpdater.cs
- ParserStreamGeometryContext.cs
- BufferBuilder.cs
- BidOverLoads.cs
- CommentEmitter.cs
- Avt.cs
- ParserStreamGeometryContext.cs
- BooleanConverter.cs
- CustomExpression.cs
- GenericAuthenticationEventArgs.cs
- SvcMapFileLoader.cs
- CodeExporter.cs
- Lazy.cs
- ClientUrlResolverWrapper.cs
- FormsAuthenticationTicket.cs
- ActivityDelegate.cs
- SoapElementAttribute.cs
- ObjectDataSourceDisposingEventArgs.cs
- DispatcherExceptionFilterEventArgs.cs
- __ConsoleStream.cs
- XmlChoiceIdentifierAttribute.cs
- SafeRightsManagementPubHandle.cs
- ProcessModelInfo.cs
- mda.cs
- AdvancedBindingEditor.cs
- OutputCacheModule.cs
- QilExpression.cs
- WebUtil.cs
- IteratorFilter.cs
- Frame.cs
- ManagementObjectSearcher.cs
- CheckPair.cs
- OrderByBuilder.cs
- FileDialogCustomPlacesCollection.cs
- StructuredTypeInfo.cs
- ImpersonationContext.cs
- DocumentApplicationJournalEntry.cs
- ExtensionQuery.cs
- PropertyValueUIItem.cs
- HyperLinkField.cs
- ValueTable.cs
- PropVariant.cs
- Boolean.cs
- UserControlParser.cs
- SimpleTableProvider.cs
- RawStylusActions.cs
- MatrixUtil.cs
- CodeTypeReferenceExpression.cs
- DataGridViewCheckBoxColumn.cs
- SHA256Cng.cs
- hresults.cs
- JpegBitmapEncoder.cs
- FullTextBreakpoint.cs
- StringToken.cs
- Button.cs
- EncodingTable.cs
- QueryStringParameter.cs
- InputLanguage.cs
- EncoderExceptionFallback.cs
- StandardCommands.cs
- PropertyDescriptorCollection.cs
- URL.cs
- CompModSwitches.cs
- FileUpload.cs
- TemplateApplicationHelper.cs