Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / CommonUI / System / Drawing / Advanced / EncoderParameters.cs / 1305376 / EncoderParameters.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Drawing.Imaging { using System.Text; using System.Runtime.InteropServices; using System.Diagnostics; using System.Diagnostics.CodeAnalysis; using System; using System.Drawing.Internal; using Marshal = System.Runtime.InteropServices.Marshal; using System.Drawing; //[StructLayout(LayoutKind.Sequential)] ////// /// public sealed class EncoderParameters : IDisposable { EncoderParameter[] param; ///[To be supplied.] ////// /// public EncoderParameters(int count) { param = new EncoderParameter[count]; } ///[To be supplied.] ////// /// public EncoderParameters() { param = new EncoderParameter[1]; } ///[To be supplied.] ////// /// public EncoderParameter[] Param { // get { return param; } set { param = value; } } ///[To be supplied.] ////// Copy the EncoderParameters data into a chunk of memory to be consumed by native GDI+ code. /// /// We need to marshal the EncoderParameters info from/to native GDI+ ourselve since the definition of the managed/unmanaged classes /// are different and the native class is a bit weird. The native EncoderParameters class is defined in GDI+ as follows: /// /// class EncoderParameters { /// UINT Count; // Number of parameters in this structure /// EncoderParameter Parameter[1]; // Parameter values /// }; /// /// We don't have the 'Count' field since the managed array contains it. In order for this structure to work with more than one /// EncoderParameter we need to preallocate memory for the extra n-1 elements, something like this: /// /// EncoderParameters* pEncoderParameters = (EncoderParameters*) malloc(sizeof(EncoderParameters) + (n-1) * sizeof(EncoderParameter)); /// /// Also, in 64-bit platforms, 'Count' is aligned in 8 bytes (4 extra padding bytes) so we use IntPtr instead of Int32 to account for /// that (See VSW#451333). /// internal IntPtr ConvertToMemory() { int size = Marshal.SizeOf(typeof(EncoderParameter)); IntPtr memory = Marshal.AllocHGlobal(param.Length * size + Marshal.SizeOf(typeof(IntPtr))); if (memory == IntPtr.Zero){ throw SafeNativeMethods.Gdip.StatusException(SafeNativeMethods.Gdip.OutOfMemory); } Marshal.WriteIntPtr(memory, (IntPtr) param.Length); long arrayOffset = (long) memory + Marshal.SizeOf(typeof(IntPtr)); for (int i=0; i/// Copy the native GDI+ EncoderParameters data from a chunk of memory into a managed EncoderParameters object. /// See ConvertToMemory for more info. /// [SuppressMessage("Microsoft.Performance", "CA1808:AvoidCallsThatBoxValueTypes")] internal static EncoderParameters ConvertFromMemory(IntPtr memory) { if (memory == IntPtr.Zero) { throw SafeNativeMethods.Gdip.StatusException(SafeNativeMethods.Gdip.InvalidParameter); } int count = Marshal.ReadIntPtr(memory).ToInt32(); EncoderParameters p = new EncoderParameters(count); int size = Marshal.SizeOf(typeof(EncoderParameter)); long arrayOffset = (long)memory + Marshal.SizeOf(typeof(IntPtr)); for (int i=0; i public void Dispose() { foreach (EncoderParameter p in param) { if( p != null ){ p.Dispose(); } } param = null; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //------------------------------------------------------------------------------ // // Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Drawing.Imaging { using System.Text; using System.Runtime.InteropServices; using System.Diagnostics; using System.Diagnostics.CodeAnalysis; using System; using System.Drawing.Internal; using Marshal = System.Runtime.InteropServices.Marshal; using System.Drawing; //[StructLayout(LayoutKind.Sequential)] ////// /// public sealed class EncoderParameters : IDisposable { EncoderParameter[] param; ///[To be supplied.] ////// /// public EncoderParameters(int count) { param = new EncoderParameter[count]; } ///[To be supplied.] ////// /// public EncoderParameters() { param = new EncoderParameter[1]; } ///[To be supplied.] ////// /// public EncoderParameter[] Param { // get { return param; } set { param = value; } } ///[To be supplied.] ////// Copy the EncoderParameters data into a chunk of memory to be consumed by native GDI+ code. /// /// We need to marshal the EncoderParameters info from/to native GDI+ ourselve since the definition of the managed/unmanaged classes /// are different and the native class is a bit weird. The native EncoderParameters class is defined in GDI+ as follows: /// /// class EncoderParameters { /// UINT Count; // Number of parameters in this structure /// EncoderParameter Parameter[1]; // Parameter values /// }; /// /// We don't have the 'Count' field since the managed array contains it. In order for this structure to work with more than one /// EncoderParameter we need to preallocate memory for the extra n-1 elements, something like this: /// /// EncoderParameters* pEncoderParameters = (EncoderParameters*) malloc(sizeof(EncoderParameters) + (n-1) * sizeof(EncoderParameter)); /// /// Also, in 64-bit platforms, 'Count' is aligned in 8 bytes (4 extra padding bytes) so we use IntPtr instead of Int32 to account for /// that (See VSW#451333). /// internal IntPtr ConvertToMemory() { int size = Marshal.SizeOf(typeof(EncoderParameter)); IntPtr memory = Marshal.AllocHGlobal(param.Length * size + Marshal.SizeOf(typeof(IntPtr))); if (memory == IntPtr.Zero){ throw SafeNativeMethods.Gdip.StatusException(SafeNativeMethods.Gdip.OutOfMemory); } Marshal.WriteIntPtr(memory, (IntPtr) param.Length); long arrayOffset = (long) memory + Marshal.SizeOf(typeof(IntPtr)); for (int i=0; i/// Copy the native GDI+ EncoderParameters data from a chunk of memory into a managed EncoderParameters object. /// See ConvertToMemory for more info. /// [SuppressMessage("Microsoft.Performance", "CA1808:AvoidCallsThatBoxValueTypes")] internal static EncoderParameters ConvertFromMemory(IntPtr memory) { if (memory == IntPtr.Zero) { throw SafeNativeMethods.Gdip.StatusException(SafeNativeMethods.Gdip.InvalidParameter); } int count = Marshal.ReadIntPtr(memory).ToInt32(); EncoderParameters p = new EncoderParameters(count); int size = Marshal.SizeOf(typeof(EncoderParameter)); long arrayOffset = (long)memory + Marshal.SizeOf(typeof(IntPtr)); for (int i=0; i public void Dispose() { foreach (EncoderParameter p in param) { if( p != null ){ p.Dispose(); } } param = null; } } } // 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
- XsdBuildProvider.cs
- WebControl.cs
- XmlSignatureProperties.cs
- TempFiles.cs
- PaperSource.cs
- TextBox.cs
- XmlDownloadManager.cs
- LowerCaseStringConverter.cs
- SeverityFilter.cs
- WindowsToolbar.cs
- FileRecordSequenceCompletedAsyncResult.cs
- MergeFailedEvent.cs
- SafePEFileHandle.cs
- SQLInt32.cs
- HuffmanTree.cs
- ObjectDataSourceEventArgs.cs
- WorkflowServiceHostFactory.cs
- FloatMinMaxAggregationOperator.cs
- BindingNavigator.cs
- XsltArgumentList.cs
- MimeMultiPart.cs
- DesignerLinkAdapter.cs
- DataGridViewCellValidatingEventArgs.cs
- WebBrowsableAttribute.cs
- XPathSelfQuery.cs
- CreateUserWizardStep.cs
- Parser.cs
- PolicyChain.cs
- Vector.cs
- String.cs
- PolicyImporterElement.cs
- WFItemsToSpacerVisibility.cs
- GridViewItemAutomationPeer.cs
- ReplyAdapterChannelListener.cs
- EntryIndex.cs
- FixedPageProcessor.cs
- ConstrainedGroup.cs
- GeneralTransform3DTo2D.cs
- QilSortKey.cs
- SystemIPAddressInformation.cs
- _IPv4Address.cs
- Vector3DIndependentAnimationStorage.cs
- RelationshipEndCollection.cs
- StylusButton.cs
- CodeGeneratorOptions.cs
- SamlDelegatingWriter.cs
- XmlStreamNodeWriter.cs
- InfoCardRSAPKCS1KeyExchangeFormatter.cs
- WebEventTraceProvider.cs
- HttpPostedFile.cs
- NullExtension.cs
- ClipboardData.cs
- ModelPropertyDescriptor.cs
- Interlocked.cs
- DefaultBindingPropertyAttribute.cs
- EmbeddedMailObjectsCollection.cs
- Membership.cs
- DependencySource.cs
- RoutingExtension.cs
- QilList.cs
- CFStream.cs
- UpDownBase.cs
- UidPropertyAttribute.cs
- MetabaseSettings.cs
- DataStreams.cs
- SystemTcpConnection.cs
- DesignerUtility.cs
- GroupBoxAutomationPeer.cs
- DataSourceHelper.cs
- Environment.cs
- HttpHandler.cs
- HtmlInputRadioButton.cs
- PointAnimationUsingPath.cs
- RowToParametersTransformer.cs
- AliasedSlot.cs
- ChildChangedEventArgs.cs
- WizardPanel.cs
- SamlAuthorizationDecisionClaimResource.cs
- DynamicResourceExtension.cs
- XmlSchemaNotation.cs
- BaseWebProxyFinder.cs
- Expr.cs
- InkPresenter.cs
- DataGridViewCellValueEventArgs.cs
- TextEvent.cs
- RawMouseInputReport.cs
- WebPartConnectionsDisconnectVerb.cs
- ToolStripEditorManager.cs
- XmlLinkedNode.cs
- UserMapPath.cs
- DbConnectionStringBuilder.cs
- ErrorInfoXmlDocument.cs
- EventMappingSettings.cs
- ExceptionUtil.cs
- ProfileBuildProvider.cs
- IMembershipProvider.cs
- BulletChrome.cs
- KeyFrames.cs
- EventLogPermission.cs
- ImageButton.cs