Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / Orcas / NetFXw7 / wpf / src / Base / MS / Internal / Security / RightsManagement / SafeRightsManagementSessionHandle.cs / 1 / SafeRightsManagementSessionHandle.cs
//------------------------------------------------------------------------------ // //// Copyright (c) Microsoft Corporation. All rights reserved. // // // Description: // SafeRightsManagementSessionHandle 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 SafeRightsManagementSessionHandle : SafeHandle { //Although it is not obvious this constructor is being called by the interop services // it throws exceptions without it private SafeRightsManagementSessionHandle() : 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 SafeRightsManagementSessionHandle(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.DRMCloseSession((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. //------------------------------------------------------------------------------ // //// Copyright (c) Microsoft Corporation. All rights reserved. // // // Description: // SafeRightsManagementSessionHandle 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 SafeRightsManagementSessionHandle : SafeHandle { //Although it is not obvious this constructor is being called by the interop services // it throws exceptions without it private SafeRightsManagementSessionHandle() : 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 SafeRightsManagementSessionHandle(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.DRMCloseSession((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
- SystemNetworkInterface.cs
- SQLInt16.cs
- FontCollection.cs
- ManifestResourceInfo.cs
- DesignerHelpers.cs
- HelpEvent.cs
- ValidatingCollection.cs
- ProfileServiceManager.cs
- GregorianCalendar.cs
- Size3D.cs
- AssertFilter.cs
- DataBindingHandlerAttribute.cs
- DetailsViewPageEventArgs.cs
- AssemblyCollection.cs
- StringConverter.cs
- HttpContextWrapper.cs
- StoreItemCollection.cs
- Pointer.cs
- DataColumnChangeEvent.cs
- ObjectView.cs
- SQLBytes.cs
- EmptyReadOnlyDictionaryInternal.cs
- PeerContact.cs
- EncoderExceptionFallback.cs
- TypeListConverter.cs
- MenuItem.cs
- Rectangle.cs
- XmlDomTextWriter.cs
- PeerResolverMode.cs
- AutomationElementIdentifiers.cs
- RC2.cs
- DbInsertCommandTree.cs
- XslCompiledTransform.cs
- MdImport.cs
- SpellCheck.cs
- NameObjectCollectionBase.cs
- ResourcesBuildProvider.cs
- CapabilitiesState.cs
- Serializer.cs
- ActivityLocationReferenceEnvironment.cs
- AttachedAnnotationChangedEventArgs.cs
- BigInt.cs
- Exceptions.cs
- TemplateGroupCollection.cs
- DocumentViewerHelper.cs
- StorageComplexTypeMapping.cs
- HandlerWithFactory.cs
- OleDbInfoMessageEvent.cs
- Console.cs
- QuaternionAnimationBase.cs
- RSAPKCS1SignatureDeformatter.cs
- XmlQueryOutput.cs
- MultipleCopiesCollection.cs
- ComponentEditorForm.cs
- TableRowCollection.cs
- TextElement.cs
- RepeatBehaviorConverter.cs
- RelativeSource.cs
- PriorityBinding.cs
- SqlTriggerAttribute.cs
- XPathMessageFilterTable.cs
- DrawingAttributesDefaultValueFactory.cs
- ReceiveCompletedEventArgs.cs
- SystemBrushes.cs
- ParameterBuilder.cs
- CounterCreationDataCollection.cs
- ClientRoleProvider.cs
- MemberAccessException.cs
- Panel.cs
- XmlWellformedWriter.cs
- ScopelessEnumAttribute.cs
- CodePrimitiveExpression.cs
- NumberSubstitution.cs
- SerializableAttribute.cs
- QilUnary.cs
- SafeTimerHandle.cs
- ScriptResourceAttribute.cs
- EntityDataSourceWizardForm.cs
- DbSource.cs
- DataGridViewImageCell.cs
- EndPoint.cs
- ComboBoxItem.cs
- ToolBarTray.cs
- GroupBox.cs
- MenuItem.cs
- EdmComplexTypeAttribute.cs
- X500Name.cs
- Sql8ConformanceChecker.cs
- HMACSHA1.cs
- AuthorizationSection.cs
- HtmlInputText.cs
- SubclassTypeValidator.cs
- Literal.cs
- XPathException.cs
- AnimatedTypeHelpers.cs
- PersonalizationState.cs
- TypeConverterValueSerializer.cs
- LeafCellTreeNode.cs
- TextCollapsingProperties.cs
- CollectionConverter.cs