Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Base / MS / Internal / Security / RightsManagement / SafeRightsManagementHandle.cs / 1 / SafeRightsManagementHandle.cs
//------------------------------------------------------------------------------ // //// Copyright (c) Microsoft Corporation. All rights reserved. // // // Description: // SafeRightsManagementHandle class // // History: // 10/12/2005: [....]: 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. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu

This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- QueryableFilterRepeater.cs
- TraceLog.cs
- RoleService.cs
- MetabaseServerConfig.cs
- AlphabeticalEnumConverter.cs
- TextViewElement.cs
- DigestTraceRecordHelper.cs
- WorkflowMarkupSerializationProvider.cs
- MessageQueueTransaction.cs
- UIElementCollection.cs
- PerformanceCounterCategory.cs
- UserPersonalizationStateInfo.cs
- ResourceExpressionEditor.cs
- SafeBitVector32.cs
- DataIdProcessor.cs
- Assert.cs
- WinEventQueueItem.cs
- TextBoxAutoCompleteSourceConverter.cs
- EntityCollection.cs
- AspCompat.cs
- panel.cs
- RowUpdatedEventArgs.cs
- Oid.cs
- ConsoleKeyInfo.cs
- VisualStateGroup.cs
- ShimAsPublicXamlType.cs
- EnumerableCollectionView.cs
- DashStyles.cs
- HtmlTable.cs
- MonthCalendar.cs
- QueryAccessibilityHelpEvent.cs
- ImageFormatConverter.cs
- StringStorage.cs
- WebConfigurationFileMap.cs
- CatalogZoneBase.cs
- RectAnimation.cs
- Convert.cs
- XmlDigitalSignatureProcessor.cs
- PageParserFilter.cs
- Binding.cs
- WebPartDeleteVerb.cs
- PieceNameHelper.cs
- InternalUserCancelledException.cs
- FontDialog.cs
- PropertyGridCommands.cs
- DependencySource.cs
- FileRecordSequenceHelper.cs
- PlatformNotSupportedException.cs
- Attributes.cs
- TreeNodeMouseHoverEvent.cs
- OleDbSchemaGuid.cs
- TextStore.cs
- DomNameTable.cs
- FlowDocumentPage.cs
- ResourceDescriptionAttribute.cs
- GridViewColumnCollection.cs
- ConfigurationSectionGroup.cs
- WebControlsSection.cs
- WindowsFormsSectionHandler.cs
- Invariant.cs
- XmlCountingReader.cs
- FormViewDeletedEventArgs.cs
- TypeGenericEnumerableViewSchema.cs
- ModuleConfigurationInfo.cs
- TextAutomationPeer.cs
- Mutex.cs
- XmlConvert.cs
- CollectionViewSource.cs
- FormsAuthenticationConfiguration.cs
- EntityDesignerBuildProvider.cs
- TableCellCollection.cs
- ImpersonateTokenRef.cs
- MenuRendererClassic.cs
- _ChunkParse.cs
- CodeDomSerializerBase.cs
- PolyBezierSegment.cs
- NumericExpr.cs
- WebPartEventArgs.cs
- PropertyPushdownHelper.cs
- QueryOutputWriter.cs
- MenuItem.cs
- HtmlShim.cs
- SiteOfOriginContainer.cs
- BookmarkUndoUnit.cs
- InputReport.cs
- RegionInfo.cs
- OdbcParameterCollection.cs
- PaginationProgressEventArgs.cs
- DataGridViewCellStyleBuilderDialog.cs
- IncomingWebResponseContext.cs
- LabelExpression.cs
- CollectionCodeDomSerializer.cs
- MdImport.cs
- IHttpResponseInternal.cs
- XamlPoint3DCollectionSerializer.cs
- ElapsedEventArgs.cs
- StateFinalizationDesigner.cs
- PersistenceException.cs
- QueryOperationResponseOfT.cs
- WebScriptServiceHostFactory.cs