Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / Orcas / QFE / wpf / src / Base / MS / Internal / Security / RightsManagement / SafeRightsManagementHandle.cs / 1 / SafeRightsManagementHandle.cs
//------------------------------------------------------------------------------ // //// Copyright (c) Microsoft Corporation. All rights reserved. // // // Description: // SafeRightsManagementHandle 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 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. // // // Description: // SafeRightsManagementHandle 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 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.
Link Menu

This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- DetailsViewRowCollection.cs
- XmlSchemaValidationException.cs
- StreamResourceInfo.cs
- XmlEncApr2001.cs
- UITypeEditor.cs
- UIElementCollection.cs
- SqlFormatter.cs
- WebPartConnectionsCloseVerb.cs
- HwndAppCommandInputProvider.cs
- Accessible.cs
- RectAnimationBase.cs
- Math.cs
- DiffuseMaterial.cs
- DataGridTableCollection.cs
- linebase.cs
- Int32Collection.cs
- ThicknessAnimationBase.cs
- IndexedString.cs
- ExtentCqlBlock.cs
- ToolboxComponentsCreatedEventArgs.cs
- FontCollection.cs
- ProvidersHelper.cs
- tooltip.cs
- AmbientProperties.cs
- RangeContentEnumerator.cs
- CacheVirtualItemsEvent.cs
- PrintDocument.cs
- TransformerInfoCollection.cs
- SystemColors.cs
- ZipIOExtraFieldElement.cs
- XmlWellformedWriterHelpers.cs
- XmlConvert.cs
- UdpDiscoveryEndpointElement.cs
- PrintDialog.cs
- UserControlParser.cs
- SqlServer2KCompatibilityCheck.cs
- CodeDirectoryCompiler.cs
- Inflater.cs
- TypeResolver.cs
- safex509handles.cs
- FamilyTypeface.cs
- DocComment.cs
- StrongNameHelpers.cs
- DynamicResourceExtensionConverter.cs
- _DigestClient.cs
- XmlNavigatorStack.cs
- IntranetCredentialPolicy.cs
- XmlSchemaExporter.cs
- CuspData.cs
- MethodCallExpression.cs
- XmlObjectSerializerContext.cs
- Vector.cs
- StdValidatorsAndConverters.cs
- CngProvider.cs
- CanonicalXml.cs
- TextViewSelectionProcessor.cs
- DataShape.cs
- XmlWellformedWriter.cs
- WmlLiteralTextAdapter.cs
- ObjectItemAttributeAssemblyLoader.cs
- ToolStripLocationCancelEventArgs.cs
- OleDbMetaDataFactory.cs
- UrlPath.cs
- SqlVersion.cs
- ISCIIEncoding.cs
- HTMLTagNameToTypeMapper.cs
- EncodingDataItem.cs
- JournalEntry.cs
- OleDbRowUpdatedEvent.cs
- PartitionedDataSource.cs
- HttpNamespaceReservationInstallComponent.cs
- MouseActionValueSerializer.cs
- DecoderFallback.cs
- FontCacheUtil.cs
- WeakEventManager.cs
- webclient.cs
- HttpCookiesSection.cs
- RepeatInfo.cs
- NamespaceInfo.cs
- ConfigurationStrings.cs
- DataTableCollection.cs
- PerformanceCounterPermissionEntryCollection.cs
- SqlDataSourceView.cs
- SettingsProperty.cs
- HMACSHA256.cs
- AlphaSortedEnumConverter.cs
- OleDbPropertySetGuid.cs
- ActiveDocumentEvent.cs
- HostingEnvironmentException.cs
- TemplatePropertyEntry.cs
- ListView.cs
- MetadataItemSerializer.cs
- GridViewColumnCollection.cs
- ListViewGroupItemCollection.cs
- processwaithandle.cs
- ToolboxCategory.cs
- Point.cs
- ConfigurationValue.cs
- FileDialog_Vista_Interop.cs
- Rectangle.cs