Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Base / MS / Internal / Security / RightsManagement / SafeRightsManagementPubHandle.cs / 1 / SafeRightsManagementPubHandle.cs
//------------------------------------------------------------------------------ // //// Copyright (c) Microsoft Corporation. All rights reserved. // // // Description: // SafeRightsManagementPubHandle 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 SafeRightsManagementPubHandle : SafeHandle { //Although it is not obvious this constructor is being called by the interop services // it throws exceptions without it private SafeRightsManagementPubHandle() : 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 SafeRightsManagementPubHandle(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.DRMClosePubHandle((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 SafeRightsManagementPubHandle InvalidHandle { get { return _invalidHandle; } } private static readonly SafeRightsManagementPubHandle _invalidHandle = new SafeRightsManagementPubHandle(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
- Comparer.cs
- X509Certificate.cs
- RectKeyFrameCollection.cs
- ExpressionBinding.cs
- WebConfigurationHost.cs
- AssociationSetMetadata.cs
- _AutoWebProxyScriptEngine.cs
- CharUnicodeInfo.cs
- XmlEntity.cs
- PowerStatus.cs
- ButtonChrome.cs
- ProxyHelper.cs
- Soap12ProtocolImporter.cs
- NameValuePair.cs
- Grid.cs
- ILGenerator.cs
- SizeF.cs
- TemplateBamlRecordReader.cs
- DocumentXPathNavigator.cs
- SrgsElementFactory.cs
- regiisutil.cs
- _Rfc2616CacheValidators.cs
- DiscoveryClient.cs
- ServiceDesigner.xaml.cs
- ExtendedPropertyInfo.cs
- FtpWebResponse.cs
- SQLCharsStorage.cs
- ShutDownListener.cs
- SafeTimerHandle.cs
- EntityParameterCollection.cs
- PriorityQueue.cs
- SchemaImporterExtension.cs
- FileBasedResourceGroveler.cs
- PointF.cs
- BitmapCodecInfo.cs
- AttributeEmitter.cs
- metrodevice.cs
- TemplatePropertyEntry.cs
- WebPartCollection.cs
- AsymmetricSignatureFormatter.cs
- httpapplicationstate.cs
- StreamBodyWriter.cs
- DataSetMappper.cs
- Rotation3DAnimation.cs
- EntityContainerEntitySet.cs
- CapabilitiesRule.cs
- ColorIndependentAnimationStorage.cs
- GridEntryCollection.cs
- TypeSystem.cs
- HttpApplication.cs
- Emitter.cs
- ParserContext.cs
- GetCardDetailsRequest.cs
- Expander.cs
- RadioButtonRenderer.cs
- MeasureItemEvent.cs
- PageContentCollection.cs
- DocumentOrderQuery.cs
- MethodToken.cs
- EncoderNLS.cs
- ReliabilityContractAttribute.cs
- QuaternionAnimation.cs
- VirtualDirectoryMappingCollection.cs
- UnitySerializationHolder.cs
- Wrapper.cs
- exports.cs
- BuildManager.cs
- ExceptionHandlersDesigner.cs
- GlyphRunDrawing.cs
- TableCellAutomationPeer.cs
- CommandBinding.cs
- WorkflowEventArgs.cs
- GridErrorDlg.cs
- SatelliteContractVersionAttribute.cs
- Thread.cs
- SelectionBorderGlyph.cs
- SpellerHighlightLayer.cs
- StatusBar.cs
- LayoutEditorPart.cs
- PrintDialogDesigner.cs
- ConfigurationStrings.cs
- XmlExtensionFunction.cs
- ToolStripInSituService.cs
- _ChunkParse.cs
- DataGridViewCheckBoxCell.cs
- QuadraticBezierSegment.cs
- GridErrorDlg.cs
- SignerInfo.cs
- Attributes.cs
- DocumentGridContextMenu.cs
- HtmlTableRowCollection.cs
- SymLanguageType.cs
- ConfigurationValue.cs
- latinshape.cs
- TextSyndicationContentKindHelper.cs
- hresults.cs
- GenericTransactionFlowAttribute.cs
- WindowPattern.cs
- ChangeProcessor.cs
- BamlLocalizabilityResolver.cs