Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Base / MS / Internal / Security / RightsManagement / SafeRightsManagementQueryHandle.cs / 1 / SafeRightsManagementQueryHandle.cs
//------------------------------------------------------------------------------ // //// Copyright (c) Microsoft Corporation. All rights reserved. // // // Description: // SafeRightsManagementQueryHandle 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 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.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- DataContractSerializer.cs
- SpanIndex.cs
- AssertSection.cs
- __FastResourceComparer.cs
- AccessDataSource.cs
- XmlArrayItemAttributes.cs
- diagnosticsswitches.cs
- MetadataItem.cs
- RepeaterCommandEventArgs.cs
- DataTableReaderListener.cs
- UrlMappingCollection.cs
- cookieexception.cs
- RecordsAffectedEventArgs.cs
- DateTimeConstantAttribute.cs
- DayRenderEvent.cs
- SqlBulkCopyColumnMapping.cs
- HttpWrapper.cs
- Point4DValueSerializer.cs
- Point4DValueSerializer.cs
- ObjectListFieldCollection.cs
- BamlLocalizableResourceKey.cs
- SqlRemoveConstantOrderBy.cs
- XmlSchemaValidationException.cs
- SafeLibraryHandle.cs
- PropertyChangingEventArgs.cs
- TypePropertyEditor.cs
- BoundField.cs
- ConfigurationStrings.cs
- Size.cs
- RemoveStoryboard.cs
- ToolbarAUtomationPeer.cs
- FlowDocumentPageViewerAutomationPeer.cs
- LinkDescriptor.cs
- SafeNativeMethods.cs
- DecimalAnimationBase.cs
- HostedAspNetEnvironment.cs
- QueryStringHandler.cs
- ContentPlaceHolder.cs
- TraceFilter.cs
- EntityDataSourceWrapperCollection.cs
- Model3DGroup.cs
- ClientTargetCollection.cs
- XPathNodePointer.cs
- XmlNodeList.cs
- DataBoundControlAdapter.cs
- TextParagraphCache.cs
- CompiledQueryCacheEntry.cs
- TemplateKey.cs
- InitializeCorrelation.cs
- AnimationClock.cs
- ProfilePropertyMetadata.cs
- CalendarDayButton.cs
- EntityDataSourceSelectedEventArgs.cs
- BindingList.cs
- InstallHelper.cs
- StringKeyFrameCollection.cs
- LayoutManager.cs
- StrokeNode.cs
- XmlEncoding.cs
- PerformanceCounterPermission.cs
- MarshalByValueComponent.cs
- BooleanSwitch.cs
- HttpsHostedTransportConfiguration.cs
- DocumentXPathNavigator.cs
- M3DUtil.cs
- SiteMapHierarchicalDataSourceView.cs
- TraceHandler.cs
- BadImageFormatException.cs
- PartialClassGenerationTaskInternal.cs
- RequestCacheValidator.cs
- ToolStripSplitStackLayout.cs
- SerialPort.cs
- StateChangeEvent.cs
- StrokeNodeOperations2.cs
- ApplicationFileCodeDomTreeGenerator.cs
- OleDbInfoMessageEvent.cs
- AccessDataSource.cs
- ServiceContractViewControl.Designer.cs
- DragEventArgs.cs
- ProgressChangedEventArgs.cs
- DefaultProxySection.cs
- HostedHttpContext.cs
- DependencyObjectPropertyDescriptor.cs
- isolationinterop.cs
- Geometry3D.cs
- StyleSelector.cs
- EditorBrowsableAttribute.cs
- RegexBoyerMoore.cs
- SqlDataRecord.cs
- HMACSHA512.cs
- CodeArrayCreateExpression.cs
- TrackingServices.cs
- AuthenticationService.cs
- AutoGeneratedField.cs
- TextDocumentView.cs
- CharStorage.cs
- AsymmetricSignatureFormatter.cs
- ParameterCollection.cs
- WinFormsUtils.cs
- ProcessInfo.cs