Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Base / MS / Internal / Security / RightsManagement / SafeRightsManagementEnvironmentHandle.cs / 1 / SafeRightsManagementEnvironmentHandle.cs
//------------------------------------------------------------------------------ // //// Copyright (c) Microsoft Corporation. All rights reserved. // // // Description: // SafeRightsManagementEnvironmentHandle 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 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.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- FormsAuthenticationEventArgs.cs
- Crc32Helper.cs
- BitmapEffectDrawingContextWalker.cs
- VarInfo.cs
- KeyGestureValueSerializer.cs
- ItemContainerGenerator.cs
- DateTimeUtil.cs
- ExpressionNode.cs
- UpdateTracker.cs
- Soap.cs
- CornerRadiusConverter.cs
- MultilineStringConverter.cs
- BasicBrowserDialog.designer.cs
- XhtmlTextWriter.cs
- ResourceReferenceKeyNotFoundException.cs
- MimeMultiPart.cs
- ScriptingJsonSerializationSection.cs
- ScrollBar.cs
- TextEvent.cs
- TextEditorMouse.cs
- ChannelPool.cs
- ToolStripHighContrastRenderer.cs
- SerializationEventsCache.cs
- IncrementalCompileAnalyzer.cs
- Pair.cs
- DataGridCommandEventArgs.cs
- ByValueEqualityComparer.cs
- PanelStyle.cs
- SerialReceived.cs
- ExpressionVisitor.cs
- PartBasedPackageProperties.cs
- SqlStatistics.cs
- HwndStylusInputProvider.cs
- SafeNativeMethods.cs
- ExpressionBindingCollection.cs
- AuthenticationServiceManager.cs
- SqlDataSourceView.cs
- ProgressChangedEventArgs.cs
- EncoderExceptionFallback.cs
- FrameworkReadOnlyPropertyMetadata.cs
- LocalizabilityAttribute.cs
- Automation.cs
- Roles.cs
- GeneralTransform3DTo2DTo3D.cs
- MouseGestureValueSerializer.cs
- SparseMemoryStream.cs
- SafeRightsManagementEnvironmentHandle.cs
- CustomSignedXml.cs
- LayoutTableCell.cs
- ToolStripSplitButton.cs
- SR.cs
- EntityContainerEmitter.cs
- TreeNodeCollection.cs
- WinFormsSecurity.cs
- ResourceBinder.cs
- DistinctQueryOperator.cs
- EventLogPermissionEntryCollection.cs
- TypeExtensionConverter.cs
- TraceInternal.cs
- StorageScalarPropertyMapping.cs
- ActivityDesignerHelper.cs
- TrustLevel.cs
- LinkGrep.cs
- DynamicActivityProperty.cs
- uribuilder.cs
- Bold.cs
- ObjectSelectorEditor.cs
- SystemUdpStatistics.cs
- ItemCollection.cs
- VariableExpressionConverter.cs
- SafeFileMappingHandle.cs
- _NativeSSPI.cs
- BackoffTimeoutHelper.cs
- VBCodeProvider.cs
- SizeAnimationBase.cs
- ResourceProviderFactory.cs
- AppDomainProtocolHandler.cs
- VSDExceptions.cs
- KeyPullup.cs
- GridViewColumn.cs
- TabControl.cs
- Thickness.cs
- WebPartConnectionsConfigureVerb.cs
- RectKeyFrameCollection.cs
- ImmutableDispatchRuntime.cs
- SHA1CryptoServiceProvider.cs
- ClientData.cs
- IdentityNotMappedException.cs
- XsltCompileContext.cs
- SafeThreadHandle.cs
- Events.cs
- JapaneseCalendar.cs
- TagPrefixInfo.cs
- ReflectionPermission.cs
- FormViewPageEventArgs.cs
- DocumentEventArgs.cs
- SHA512Cng.cs
- ContainerVisual.cs
- Models.cs
- Operand.cs