Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / Orcas / QFE / wpf / src / Base / MS / Internal / Security / RightsManagement / SafeRightsManagementHandle.cs / 1 / 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. //------------------------------------------------------------------------------ // //// 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
- NameValueConfigurationCollection.cs
- ChineseLunisolarCalendar.cs
- RequestCacheEntry.cs
- IdentityNotMappedException.cs
- XmlAttribute.cs
- DataGridViewCellValidatingEventArgs.cs
- SendMailErrorEventArgs.cs
- Page.cs
- ProfilePropertySettingsCollection.cs
- ObjectDataSourceMethodEventArgs.cs
- UnsafeNativeMethods.cs
- PrintPreviewGraphics.cs
- LinqDataSourceValidationException.cs
- PageRouteHandler.cs
- SQLMoneyStorage.cs
- _LocalDataStore.cs
- _WebProxyDataBuilder.cs
- ClientUtils.cs
- XamlReader.cs
- FileNotFoundException.cs
- RijndaelManagedTransform.cs
- HtmlInputButton.cs
- Stackframe.cs
- ArcSegment.cs
- FigureHelper.cs
- TypeLibConverter.cs
- DataGridPagerStyle.cs
- SocketAddress.cs
- BinaryParser.cs
- MaterializeFromAtom.cs
- TransformerInfoCollection.cs
- ComplusEndpointConfigContainer.cs
- Parsers.cs
- XslException.cs
- OrthographicCamera.cs
- AncestorChangedEventArgs.cs
- _ChunkParse.cs
- VersionedStreamOwner.cs
- VariableAction.cs
- XmlSerializerAssemblyAttribute.cs
- BuildManagerHost.cs
- ScriptModule.cs
- DataGridRowClipboardEventArgs.cs
- CodeCommentStatement.cs
- TypeLoadException.cs
- TransportSecurityProtocol.cs
- ListView.cs
- FatalException.cs
- CancellationHandler.cs
- CompressStream.cs
- RecipientInfo.cs
- altserialization.cs
- SmtpReplyReaderFactory.cs
- TextEditorSelection.cs
- Attributes.cs
- XmlCustomFormatter.cs
- GrammarBuilder.cs
- TypeSource.cs
- JavaScriptObjectDeserializer.cs
- ArithmeticException.cs
- WinFormsUtils.cs
- SerTrace.cs
- ProjectionCamera.cs
- ModulesEntry.cs
- GroupBoxRenderer.cs
- FontFamilyIdentifier.cs
- DependencyObjectPropertyDescriptor.cs
- TypefaceCollection.cs
- EventEntry.cs
- PinnedBufferMemoryStream.cs
- ResolveNameEventArgs.cs
- PropertyConverter.cs
- XmlEventCache.cs
- KeyValuePair.cs
- ProtocolsSection.cs
- DataGridViewTopLeftHeaderCell.cs
- SemanticAnalyzer.cs
- WorkflowEnvironment.cs
- ListItemCollection.cs
- ListItemCollection.cs
- LinkButton.cs
- SmtpFailedRecipientsException.cs
- FlowDocumentFormatter.cs
- MachinePropertyVariants.cs
- PublisherMembershipCondition.cs
- TrustLevel.cs
- TypeInfo.cs
- GradientStopCollection.cs
- ParameterElement.cs
- PagesSection.cs
- Double.cs
- SQLMoneyStorage.cs
- ProviderSettings.cs
- ScriptReferenceBase.cs
- EventEntry.cs
- AssertUtility.cs
- WebServiceFault.cs
- BlockCollection.cs
- XPathNodeInfoAtom.cs
- CommandBinding.cs