Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Base / MS / Internal / Security / RightsManagement / SafeRightsManagementHandle.cs / 1305600 / SafeRightsManagementHandle.cs
//------------------------------------------------------------------------------ // //// Copyright (c) Microsoft Corporation. All rights reserved. // // // Description: // SafeRightsManagementHandle 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 SafeRightsManagementHandle : SafeHandle { //Although it is not obvious this constructor is being called by the interop services // it throws exceptions without it private SafeRightsManagementHandle() : 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 SafeRightsManagementHandle(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.DRMCloseHandle((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); } } internal static SafeRightsManagementHandle InvalidHandle { get { return _invalidHandle; } } private static readonly SafeRightsManagementHandle _invalidHandle = new SafeRightsManagementHandle(0); } } // 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
- LazyTextWriterCreator.cs
- FileRecordSequence.cs
- CriticalExceptions.cs
- QueryCreatedEventArgs.cs
- SiteOfOriginContainer.cs
- PropertyMapper.cs
- TypeUtil.cs
- RenderData.cs
- CodeCommentStatementCollection.cs
- GcSettings.cs
- WebBrowserBase.cs
- DecoderFallbackWithFailureFlag.cs
- SqlUnionizer.cs
- HMACSHA512.cs
- LinqDataSource.cs
- XpsDocumentEvent.cs
- ParentQuery.cs
- ElementProxy.cs
- SHA1CryptoServiceProvider.cs
- MetadataFile.cs
- XmlDataProvider.cs
- GeometryDrawing.cs
- HistoryEventArgs.cs
- ToolStripItemRenderEventArgs.cs
- MediaElementAutomationPeer.cs
- ImageButton.cs
- SqlTriggerContext.cs
- WindowsRegion.cs
- MultiBindingExpression.cs
- FloaterBaseParaClient.cs
- WindowsToolbarAsMenu.cs
- Propagator.cs
- ObjectDataSourceFilteringEventArgs.cs
- CounterSet.cs
- XmlCharType.cs
- XomlCompiler.cs
- GlyphElement.cs
- X509Chain.cs
- CollectionViewSource.cs
- ProxyElement.cs
- SerializationEventsCache.cs
- DrawingContextWalker.cs
- XsdValidatingReader.cs
- SchemaCreator.cs
- SiteMapNodeCollection.cs
- GuidTagList.cs
- SizeConverter.cs
- figurelength.cs
- DataGridHelper.cs
- MailDefinition.cs
- TreeNodeStyle.cs
- ListViewTableCell.cs
- DataGridColumnStyleMappingNameEditor.cs
- SQLByte.cs
- DataTable.cs
- InputMethodStateTypeInfo.cs
- EventLogPermission.cs
- TextProviderWrapper.cs
- SqlDataSourceStatusEventArgs.cs
- OleDbRowUpdatingEvent.cs
- EdgeModeValidation.cs
- LedgerEntry.cs
- mediaeventargs.cs
- DSASignatureFormatter.cs
- Hyperlink.cs
- WindowsToolbar.cs
- MetadataFile.cs
- MsmqIntegrationChannelFactory.cs
- BuilderElements.cs
- PreProcessInputEventArgs.cs
- ProgressBarRenderer.cs
- SharedHttpsTransportManager.cs
- FullTextLine.cs
- BitmapEffectDrawingContent.cs
- ResourceDictionaryCollection.cs
- Vector3DKeyFrameCollection.cs
- BitmapScalingModeValidation.cs
- UriTemplateTrieLocation.cs
- ApplicationTrust.cs
- ImageListUtils.cs
- XpsInterleavingPolicy.cs
- StructuralType.cs
- SizeF.cs
- SetterBaseCollection.cs
- SecureConversationVersion.cs
- WizardStepBase.cs
- CacheRequest.cs
- GeometryHitTestResult.cs
- XmlChildNodes.cs
- RayHitTestParameters.cs
- MailWebEventProvider.cs
- TextLineBreak.cs
- DbDataRecord.cs
- ListSortDescriptionCollection.cs
- MissingMemberException.cs
- CannotUnloadAppDomainException.cs
- GradientBrush.cs
- ResolveDuplexCD1AsyncResult.cs
- ListViewContainer.cs
- SourceElementsCollection.cs