Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Base / MS / Internal / Security / RightsManagement / SafeRightsManagementEnvironmentHandle.cs / 1305600 / SafeRightsManagementEnvironmentHandle.cs
//------------------------------------------------------------------------------ // //// Copyright (c) Microsoft Corporation. All rights reserved. // // // Description: // SafeRightsManagementEnvironmentHandle class // // History: // 10/12/2005: SarjanaS: Initial implementation. // //----------------------------------------------------------------------------- using System; using System.Runtime.InteropServices; using Microsoft.Win32.SafeHandles; using System.Security; namespace MS.Internal.Security.RightsManagement { [SecurityCritical(SecurityCriticalScope.Everything)] internal sealed class SafeRightsManagementEnvironmentHandle : SafeHandle { //Although it is not obvious this constructor is being called by the interop services // it throws exceptions without it private SafeRightsManagementEnvironmentHandle() : base(IntPtr.Zero, true) { } // We have incompatibility between SafeHandle class hierarchy and the unmanaged // DRM SDK declarations. In the safe handle hierarchy it is assumed that the type // of handle is the IntPtr (64 or 32 bit depending on the platform). In the unmanaged // SDK C++ unsigned long type is used, which is 32 bit regardless of the platform. // We have decided the safest thing would be to still use the SafeHandle classes // and subclasses and cast variable back and force under assumption that IntPtr // is at least as big as unsigned long (in the managed code we generally use uint // declaration for that) internal SafeRightsManagementEnvironmentHandle(uint handle) : base((IntPtr)handle, true) // "true" means "owns the handle" { } // base class expects us to override this method with the handle specific release code protected override bool ReleaseHandle() { int z = 0; if (!IsInvalid) { // we can not use safe handle in the DrmClose... function // as the SafeHandle implementation marks this instance as an invalid by the time // ReleaseHandle is called. After that marshalling code doesn't let the current instance // of the Safe*Handle sub-class to cross managed/unmanaged boundary. z = SafeNativeMethods.DRMCloseEnvironmentHandle((uint)this.handle); #if DEBUG Errors.ThrowOnErrorCode(z); #endif // This member might be called twice(depending on the client app). In order to // prevent Unmanaged RM SDK from returning an error (Handle is already closed) // we need to mark our handle as invalid after successful close call base.SetHandle(IntPtr.Zero); } return (z>=0); } // apparently there is no existing implementation that treats Zero and only Zero as an invalid value // so we are sub-classing the base class and we need to override the IsInvalid property along with // ReleaseHandle implementation public override bool IsInvalid { get { return this.handle.Equals(IntPtr.Zero); } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- WebPartConnectVerb.cs
- NamedPipeAppDomainProtocolHandler.cs
- ClientRuntimeConfig.cs
- DSASignatureFormatter.cs
- AccessibleObject.cs
- SymLanguageVendor.cs
- Command.cs
- DelayedRegex.cs
- PerfCounterSection.cs
- HeaderedContentControl.cs
- BufferedOutputStream.cs
- SoapHttpTransportImporter.cs
- XmlSignificantWhitespace.cs
- CssStyleCollection.cs
- ToolStripMenuItem.cs
- PrincipalPermission.cs
- XmlDataCollection.cs
- InvalidCastException.cs
- DependencyObject.cs
- HandlerFactoryWrapper.cs
- SubqueryRules.cs
- ConstantCheck.cs
- IPPacketInformation.cs
- XmlSchemaSimpleContentRestriction.cs
- TdsRecordBufferSetter.cs
- IntPtr.cs
- ErrorStyle.cs
- PrintPageEvent.cs
- PropertyEntry.cs
- SmtpNegotiateAuthenticationModule.cs
- MetadataArtifactLoaderCompositeResource.cs
- DataBindingExpressionBuilder.cs
- FileSystemInfo.cs
- GridToolTip.cs
- DataControlFieldCollection.cs
- UInt16Converter.cs
- SmiTypedGetterSetter.cs
- SemaphoreFullException.cs
- TextElement.cs
- XslVisitor.cs
- SynchronizationContext.cs
- PerformanceCounter.cs
- WindowsScrollBar.cs
- SpecularMaterial.cs
- SqlDependency.cs
- CodeParameterDeclarationExpressionCollection.cs
- WeakEventManager.cs
- EntityClientCacheEntry.cs
- RelationshipEndMember.cs
- HtmlAnchor.cs
- AssemblySettingAttributes.cs
- CoTaskMemUnicodeSafeHandle.cs
- TextProperties.cs
- StateItem.cs
- Point3D.cs
- TypeUtil.cs
- ApplicationManager.cs
- DoneReceivingAsyncResult.cs
- TableHeaderCell.cs
- XmlSerializerVersionAttribute.cs
- FormatterServices.cs
- PersonalizationDictionary.cs
- UInt32Storage.cs
- NumericExpr.cs
- ProcessHostServerConfig.cs
- OleDbErrorCollection.cs
- exports.cs
- wmiutil.cs
- ResXResourceReader.cs
- ApplicationCommands.cs
- PaperSource.cs
- SoapBinding.cs
- CodeExpressionStatement.cs
- ReturnEventArgs.cs
- OciHandle.cs
- CompressStream.cs
- FacetEnabledSchemaElement.cs
- GregorianCalendarHelper.cs
- ShaderEffect.cs
- ObjectReferenceStack.cs
- CssTextWriter.cs
- BaseValidator.cs
- Accessors.cs
- Rectangle.cs
- RootBrowserWindowAutomationPeer.cs
- RecipientInfo.cs
- PresentationTraceSources.cs
- Html32TextWriter.cs
- Calendar.cs
- ReflectionTypeLoadException.cs
- TemplateParser.cs
- CodeDirectiveCollection.cs
- BitmapCodecInfoInternal.cs
- SmiConnection.cs
- TextProperties.cs
- Utils.cs
- Stream.cs
- CheckoutException.cs
- ParseChildrenAsPropertiesAttribute.cs
- SelectionWordBreaker.cs