Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Base / MS / Internal / Security / RightsManagement / SafeRightsManagementHandle.cs / 1 / SafeRightsManagementHandle.cs
//------------------------------------------------------------------------------ // //// Copyright (c) Microsoft Corporation. All rights reserved. // // // Description: // SafeRightsManagementHandle 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 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.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- GridErrorDlg.cs
- NumericUpDownAcceleration.cs
- HMACSHA384.cs
- VirtualDirectoryMapping.cs
- ParseNumbers.cs
- PaginationProgressEventArgs.cs
- TypeHelper.cs
- ColorComboBox.cs
- FunctionQuery.cs
- Transactions.cs
- HtmlTable.cs
- BitStack.cs
- DataServiceProcessingPipelineEventArgs.cs
- MULTI_QI.cs
- EndpointAddressMessageFilterTable.cs
- TextElementCollection.cs
- Fx.cs
- VisualStates.cs
- TaskFileService.cs
- GenericWebPart.cs
- SessionStateContainer.cs
- EntityDataSourceViewSchema.cs
- UmAlQuraCalendar.cs
- TargetPerspective.cs
- StringArrayConverter.cs
- ExtensionFile.cs
- TreeViewImageKeyConverter.cs
- ZipIOFileItemStream.cs
- Int16.cs
- UIElement.cs
- Nodes.cs
- CompilationLock.cs
- HtmlForm.cs
- LockRenewalTask.cs
- MultiSelector.cs
- NonSerializedAttribute.cs
- DoubleCollectionConverter.cs
- PageSetupDialog.cs
- SHA256Managed.cs
- PeerNameRecord.cs
- sqlstateclientmanager.cs
- VideoDrawing.cs
- HtmlInputReset.cs
- GetReadStreamResult.cs
- RepeatBehaviorConverter.cs
- ToolStripSplitStackLayout.cs
- StylusPointProperty.cs
- EventLogPermissionEntryCollection.cs
- WizardForm.cs
- DesignerSerializationOptionsAttribute.cs
- ForwardPositionQuery.cs
- PropertyDescriptorComparer.cs
- ToolStripGripRenderEventArgs.cs
- ConsumerConnectionPoint.cs
- SqlDataSourceCommandEventArgs.cs
- ItemContainerGenerator.cs
- WorkItem.cs
- unsafeIndexingFilterStream.cs
- AdornerHitTestResult.cs
- AmbientLight.cs
- ObjectAnimationUsingKeyFrames.cs
- GridViewRowPresenter.cs
- PeerResolverSettings.cs
- DataGridPagingPage.cs
- AutomationPropertyInfo.cs
- UnmanagedMarshal.cs
- DocumentXPathNavigator.cs
- ScriptResourceInfo.cs
- FixedNode.cs
- PathGeometry.cs
- StrokeCollectionConverter.cs
- GridViewRow.cs
- ToolStripItemCollection.cs
- NestedContainer.cs
- ExternalCalls.cs
- __Error.cs
- AnnotationMap.cs
- MatrixAnimationUsingKeyFrames.cs
- XmlEntity.cs
- GridViewCellAutomationPeer.cs
- HtmlTernaryTree.cs
- Properties.cs
- CompilerError.cs
- CrossSiteScriptingValidation.cs
- BitFlagsGenerator.cs
- SessionStateModule.cs
- SmtpFailedRecipientsException.cs
- figurelength.cs
- CmsInterop.cs
- DbModificationCommandTree.cs
- SamlConstants.cs
- ObjectList.cs
- OdbcConnectionOpen.cs
- EncoderNLS.cs
- StringCollection.cs
- JavaScriptSerializer.cs
- DataServiceContext.cs
- TextProperties.cs
- TraceContextEventArgs.cs
- RestHandler.cs