Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Base / MS / Internal / Security / RightsManagement / SafeRightsManagementQueryHandle.cs / 1305600 / SafeRightsManagementQueryHandle.cs
//------------------------------------------------------------------------------ // //// Copyright (c) Microsoft Corporation. All rights reserved. // // // Description: // SafeRightsManagementQueryHandle 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 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. // // // Description: // SafeRightsManagementQueryHandle 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 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.
Link Menu

This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- ComboBoxAutomationPeer.cs
- ResourceDisplayNameAttribute.cs
- ColorConvertedBitmap.cs
- SingleSelectRootGridEntry.cs
- ProfileManager.cs
- ResourceWriter.cs
- WebPartCatalogCloseVerb.cs
- StrictAndMessageFilter.cs
- ComboBox.cs
- SecurityRuntime.cs
- LayoutEngine.cs
- InternalCache.cs
- CodeMemberEvent.cs
- ConnectionInterfaceCollection.cs
- formatstringdialog.cs
- ServiceDescriptionImporter.cs
- JoinSymbol.cs
- MaskedTextBoxTextEditor.cs
- XamlPointCollectionSerializer.cs
- CaseStatement.cs
- StrokeFIndices.cs
- RowToParametersTransformer.cs
- ToReply.cs
- PngBitmapEncoder.cs
- SurrogateSelector.cs
- QilParameter.cs
- XPathNode.cs
- NameValueSectionHandler.cs
- Int64AnimationBase.cs
- NoneExcludedImageIndexConverter.cs
- PenThreadPool.cs
- PasswordRecoveryDesigner.cs
- XmlSchemaObjectTable.cs
- NullableDoubleMinMaxAggregationOperator.cs
- Odbc32.cs
- WindowsEditBox.cs
- Inline.cs
- TextParagraphCache.cs
- ResourceReader.cs
- _FtpDataStream.cs
- Win32Native.cs
- BindableAttribute.cs
- PrimitiveXmlSerializers.cs
- ClientBuildManagerCallback.cs
- InfoCardAsymmetricCrypto.cs
- UnknownBitmapDecoder.cs
- TextDecoration.cs
- AuthenticatedStream.cs
- FragmentQueryKB.cs
- RequestCacheValidator.cs
- SizeKeyFrameCollection.cs
- CompositeClientFormatter.cs
- IncrementalHitTester.cs
- FunctionDefinition.cs
- SmtpLoginAuthenticationModule.cs
- SecuritySessionFilter.cs
- MailAddressParser.cs
- SystemInfo.cs
- SkipStoryboardToFill.cs
- ObjectViewQueryResultData.cs
- MonthChangedEventArgs.cs
- ApplicationManager.cs
- SessionStateUtil.cs
- RecognizerStateChangedEventArgs.cs
- DataRelationPropertyDescriptor.cs
- LocalizedNameDescriptionPair.cs
- WindowsListViewGroup.cs
- FileAuthorizationModule.cs
- CustomValidator.cs
- ColumnTypeConverter.cs
- ChtmlMobileTextWriter.cs
- MarkupProperty.cs
- RotateTransform3D.cs
- HttpListenerException.cs
- AssemblyCache.cs
- ToolboxItemAttribute.cs
- SiblingIterators.cs
- SafeCertificateContext.cs
- XmlSchemaSequence.cs
- LicenseProviderAttribute.cs
- ArgumentValue.cs
- ScriptControl.cs
- SqlBulkCopyColumnMappingCollection.cs
- Rotation3D.cs
- DbInsertCommandTree.cs
- OleDbConnection.cs
- ToolStripGrip.cs
- SqlMethodAttribute.cs
- ManagedIStream.cs
- SynchronizingStream.cs
- FieldMetadata.cs
- PropertyRecord.cs
- ComplexPropertyEntry.cs
- AuthenticationModuleElement.cs
- KnownAssemblyEntry.cs
- TextSearch.cs
- DebugManager.cs
- CompiledIdentityConstraint.cs
- ValidationError.cs
- CodeSnippetTypeMember.cs