Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Base / MS / Internal / Security / RightsManagement / SafeRightsManagementQueryHandle.cs / 1305600 / SafeRightsManagementQueryHandle.cs
//------------------------------------------------------------------------------ // //// Copyright (c) Microsoft Corporation. All rights reserved. // // // Description: // SafeRightsManagementQueryHandle 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 SafeRightsManagementQueryHandle : SafeHandle { //Although it is not obvious this constructor is being called by the interop services // it throws exceptions without it private SafeRightsManagementQueryHandle() : 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 SafeRightsManagementQueryHandle(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.DRMCloseQueryHandle((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: // SafeRightsManagementQueryHandle 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 SafeRightsManagementQueryHandle : SafeHandle { //Although it is not obvious this constructor is being called by the interop services // it throws exceptions without it private SafeRightsManagementQueryHandle() : 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 SafeRightsManagementQueryHandle(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.DRMCloseQueryHandle((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
- sqlcontext.cs
- Itemizer.cs
- GridErrorDlg.cs
- SessionPageStatePersister.cs
- PageCatalogPart.cs
- BevelBitmapEffect.cs
- StoryFragments.cs
- AsymmetricAlgorithm.cs
- EntityCommandExecutionException.cs
- RoleGroup.cs
- ObjectTokenCategory.cs
- Bits.cs
- TemplateControlParser.cs
- HttpResponseInternalWrapper.cs
- contentDescriptor.cs
- UpdateRecord.cs
- SubtreeProcessor.cs
- LifetimeServices.cs
- ReadOnlyHierarchicalDataSourceView.cs
- DataView.cs
- HttpValueCollection.cs
- externdll.cs
- GeometryModel3D.cs
- ErrorHandler.cs
- AssemblyAssociatedContentFileAttribute.cs
- DesignerView.xaml.cs
- ToolStripRendererSwitcher.cs
- HtmlProps.cs
- SelectionProcessor.cs
- TextFormatterHost.cs
- DocumentSchemaValidator.cs
- WriteFileContext.cs
- RewritingValidator.cs
- ResourcesBuildProvider.cs
- ZipIOLocalFileDataDescriptor.cs
- DocumentOrderComparer.cs
- SqlHelper.cs
- FixedPageStructure.cs
- ProcessThreadDesigner.cs
- Variable.cs
- NetTcpBindingElement.cs
- SQLSingle.cs
- SimpleRecyclingCache.cs
- ExpressionNode.cs
- DrawingContextDrawingContextWalker.cs
- CroppedBitmap.cs
- QuaternionRotation3D.cs
- TypeConverterAttribute.cs
- ButtonRenderer.cs
- AutoGeneratedField.cs
- SqlCommandSet.cs
- UnitySerializationHolder.cs
- sapiproxy.cs
- ApplicationFileCodeDomTreeGenerator.cs
- Lease.cs
- ErrorsHelper.cs
- TCPListener.cs
- ObjectDataProvider.cs
- PhysicalOps.cs
- HMACSHA1.cs
- DataGridViewCellStyleConverter.cs
- DesignerActionList.cs
- RelationshipManager.cs
- DBSqlParserTableCollection.cs
- BuilderPropertyEntry.cs
- UniformGrid.cs
- CodeRemoveEventStatement.cs
- DateTimePicker.cs
- RIPEMD160Managed.cs
- HtmlInputPassword.cs
- NonceToken.cs
- WindowsListViewGroup.cs
- Positioning.cs
- DispatcherExceptionEventArgs.cs
- StrongNameKeyPair.cs
- BitStack.cs
- RegistryKey.cs
- ErrorFormatter.cs
- RawMouseInputReport.cs
- CardSpaceException.cs
- CodeExporter.cs
- LineServices.cs
- FloaterParagraph.cs
- DataServiceQueryException.cs
- basemetadatamappingvisitor.cs
- ObjectMaterializedEventArgs.cs
- BrowserCapabilitiesCodeGenerator.cs
- PropertyIDSet.cs
- ListViewItem.cs
- ActivationWorker.cs
- ObjectDataSourceDisposingEventArgs.cs
- COM2ExtendedTypeConverter.cs
- Validator.cs
- RectAnimationBase.cs
- XmlQuerySequence.cs
- QilReplaceVisitor.cs
- RoleManagerModule.cs
- UserNameSecurityTokenAuthenticator.cs
- EncodingTable.cs
- WinEventQueueItem.cs