Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Base / MS / Internal / Security / RightsManagement / SafeRightsManagementEnvironmentHandle.cs / 1305600 / SafeRightsManagementEnvironmentHandle.cs
//------------------------------------------------------------------------------ // //// Copyright (c) Microsoft Corporation. All rights reserved. // // // Description: // SafeRightsManagementEnvironmentHandle 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 SafeRightsManagementEnvironmentHandle : SafeHandle { //Although it is not obvious this constructor is being called by the interop services // it throws exceptions without it private SafeRightsManagementEnvironmentHandle() : 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 SafeRightsManagementEnvironmentHandle(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.DRMCloseEnvironmentHandle((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: // SafeRightsManagementEnvironmentHandle 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 SafeRightsManagementEnvironmentHandle : SafeHandle { //Although it is not obvious this constructor is being called by the interop services // it throws exceptions without it private SafeRightsManagementEnvironmentHandle() : 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 SafeRightsManagementEnvironmentHandle(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.DRMCloseEnvironmentHandle((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
- TdsParserHelperClasses.cs
- GridViewRow.cs
- DataControlFieldTypeEditor.cs
- _SingleItemRequestCache.cs
- BooleanFunctions.cs
- AddInBase.cs
- BinaryNode.cs
- RequestCachePolicyConverter.cs
- CompositeTypefaceMetrics.cs
- WindowAutomationPeer.cs
- UniqueIdentifierService.cs
- Missing.cs
- UnsafeNativeMethods.cs
- MarkupWriter.cs
- EarlyBoundInfo.cs
- EventWaitHandle.cs
- TextContainer.cs
- ObjectComplexPropertyMapping.cs
- GuidConverter.cs
- ControlBuilder.cs
- ExpressionPrinter.cs
- IxmlLineInfo.cs
- OperationSelectorBehavior.cs
- MDIControlStrip.cs
- AVElementHelper.cs
- CodeAccessPermission.cs
- HostedElements.cs
- Binding.cs
- DoubleCollection.cs
- FloaterBaseParagraph.cs
- TextTreeRootTextBlock.cs
- TextBlock.cs
- DataGridViewBindingCompleteEventArgs.cs
- DataControlButton.cs
- InternalDuplexChannelFactory.cs
- TableColumnCollection.cs
- GB18030Encoding.cs
- StylusCollection.cs
- HtmlString.cs
- SqlNotificationRequest.cs
- TcpChannelHelper.cs
- Messages.cs
- DataKeyCollection.cs
- IsolatedStorage.cs
- MiniMapControl.xaml.cs
- ContextBase.cs
- SizeKeyFrameCollection.cs
- XpsImageSerializationService.cs
- ControlPager.cs
- ListViewSortEventArgs.cs
- UseAttributeSetsAction.cs
- UriTemplateTrieLocation.cs
- AtomPub10ServiceDocumentFormatter.cs
- DispatcherObject.cs
- ProcessModuleDesigner.cs
- TemplateGroupCollection.cs
- HandledMouseEvent.cs
- TemplateControlCodeDomTreeGenerator.cs
- XmlDataSourceNodeDescriptor.cs
- ElementProxy.cs
- ClientType.cs
- Size.cs
- ItemsPresenter.cs
- clipboard.cs
- Metadata.cs
- DisposableCollectionWrapper.cs
- Vars.cs
- Win32Native.cs
- DocumentPageHost.cs
- ThreadPool.cs
- RtfToXamlLexer.cs
- PartialTrustValidationBehavior.cs
- Clipboard.cs
- ProcessHostFactoryHelper.cs
- SecurityState.cs
- ParseHttpDate.cs
- ApplicationId.cs
- WizardDesigner.cs
- EmptyReadOnlyDictionaryInternal.cs
- ObjectKeyFrameCollection.cs
- AttachedPropertyInfo.cs
- UnsafeNativeMethods.cs
- SchemaConstraints.cs
- TabletDevice.cs
- Listbox.cs
- FixedFlowMap.cs
- Image.cs
- QueryAccessibilityHelpEvent.cs
- iisPickupDirectory.cs
- LinkUtilities.cs
- RecordsAffectedEventArgs.cs
- UriWriter.cs
- WindowsFormsSectionHandler.cs
- InvokeProviderWrapper.cs
- WebScriptClientGenerator.cs
- HwndKeyboardInputProvider.cs
- ToolbarAUtomationPeer.cs
- FormViewInsertedEventArgs.cs
- WinFormsSecurity.cs
- MainMenu.cs