Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / Orcas / QFE / wpf / src / Base / MS / Internal / Security / RightsManagement / SafeRightsManagementQueryHandle.cs / 1 / 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
- InnerItemCollectionView.cs
- ContentElement.cs
- MergeFilterQuery.cs
- CodeMemberProperty.cs
- ProjectionPruner.cs
- InputScopeManager.cs
- ServiceConfigurationTraceRecord.cs
- InvalidCommandTreeException.cs
- ObfuscationAttribute.cs
- _RequestCacheProtocol.cs
- ContainerParaClient.cs
- NamespaceMapping.cs
- RestClientProxyHandler.cs
- FormViewInsertedEventArgs.cs
- IdnMapping.cs
- Container.cs
- __TransparentProxy.cs
- InputBuffer.cs
- SafePEFileHandle.cs
- ListViewEditEventArgs.cs
- HwndProxyElementProvider.cs
- XmlNamedNodeMap.cs
- ToolStripItem.cs
- HostDesigntimeLicenseContext.cs
- OpCopier.cs
- LocationSectionRecord.cs
- XslTransform.cs
- QuaternionKeyFrameCollection.cs
- StylusPointPropertyInfoDefaults.cs
- DbConnectionStringBuilder.cs
- XslVisitor.cs
- ToolStripPanel.cs
- QilPatternFactory.cs
- ExpressionVisitor.cs
- RoleManagerModule.cs
- EntityWithChangeTrackerStrategy.cs
- XmlDocumentSchema.cs
- SHA384.cs
- FilterUserControlBase.cs
- ItemContainerPattern.cs
- HashMembershipCondition.cs
- baseaxisquery.cs
- UserControlParser.cs
- CompositeScriptReference.cs
- SendKeys.cs
- DataGridViewIntLinkedList.cs
- ServerProtocol.cs
- Timer.cs
- DesignTimeType.cs
- EntityParameterCollection.cs
- RoleManagerEventArgs.cs
- WindowsComboBox.cs
- ComPlusTypeLoader.cs
- WebPartTransformer.cs
- BypassElement.cs
- FrameworkTextComposition.cs
- WebPartChrome.cs
- UnmanagedBitmapWrapper.cs
- ByteStream.cs
- SessionEndedEventArgs.cs
- JoinSymbol.cs
- PageContentCollection.cs
- WebBrowserHelper.cs
- DataObjectAttribute.cs
- SqlInfoMessageEvent.cs
- GACIdentityPermission.cs
- WebPartActionVerb.cs
- CqlLexerHelpers.cs
- MatrixIndependentAnimationStorage.cs
- Light.cs
- ThousandthOfEmRealPoints.cs
- RowToParametersTransformer.cs
- GroupQuery.cs
- WindowsListView.cs
- PropertyMap.cs
- Timer.cs
- ConditionCollection.cs
- CacheEntry.cs
- MergeLocalizationDirectives.cs
- SaveFileDialog.cs
- EntityDesignPluralizationHandler.cs
- PieceDirectory.cs
- BinaryUtilClasses.cs
- XmlBoundElement.cs
- ComplusEndpointConfigContainer.cs
- TraceUtility.cs
- SqlClientWrapperSmiStreamChars.cs
- SqlDataSourceView.cs
- PreDigestedSignedInfo.cs
- GridSplitter.cs
- InvalidComObjectException.cs
- WmfPlaceableFileHeader.cs
- MsmqIntegrationBinding.cs
- SchemaImporterExtensionElementCollection.cs
- QueryInterceptorAttribute.cs
- OperatingSystem.cs
- WebPartDisplayModeEventArgs.cs
- DeferredTextReference.cs
- ListContractAdapter.cs
- ElementMarkupObject.cs