Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / CommonUI / System / Drawing / Advanced / EncoderParameters.cs / 1 / EncoderParameters.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- /*************************************************************************\ * * Copyright (c) 1998-1999, Microsoft Corp. All Rights Reserved. * * Module Name: * * EncoderParameters.cs * * Abstract: * * Native GDI+ EncoderParameters structure. * * Revision History: * * 9/22/1999 davidx * Created it. * \**************************************************************************/ 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.
Link Menu

This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- ScrollableControl.cs
- ManipulationDeltaEventArgs.cs
- DrawingImage.cs
- Rect3DValueSerializer.cs
- ContextQuery.cs
- SafeFileHandle.cs
- XPathScanner.cs
- DataGridColumnEventArgs.cs
- ServiceHostingEnvironment.cs
- WebPartMenuStyle.cs
- DataConnectionHelper.cs
- PageCatalogPartDesigner.cs
- StorageAssociationSetMapping.cs
- OracleTransaction.cs
- UncommonField.cs
- LineGeometry.cs
- TypefaceCollection.cs
- Style.cs
- XmlMemberMapping.cs
- ArgumentValidation.cs
- RequestQueryProcessor.cs
- PasswordRecovery.cs
- DiagnosticsConfiguration.cs
- CustomAttributeFormatException.cs
- Compiler.cs
- CodeTypeOfExpression.cs
- ThreadInterruptedException.cs
- TypeConverter.cs
- ActivityExecutor.cs
- EntitySqlQueryCacheEntry.cs
- ScrollPattern.cs
- ToolStripContentPanel.cs
- HttpAsyncResult.cs
- mongolianshape.cs
- State.cs
- oledbmetadatacollectionnames.cs
- Lasso.cs
- XPathItem.cs
- XmlEntity.cs
- InternalCache.cs
- WinEventWrap.cs
- MobileUITypeEditor.cs
- XmlJsonReader.cs
- UrlMapping.cs
- ResourceProviderFactory.cs
- KnownAssembliesSet.cs
- EnumUnknown.cs
- LineInfo.cs
- EmptyEnumerator.cs
- ContextQuery.cs
- Monitor.cs
- AnnotationHelper.cs
- PropertyTab.cs
- XPathNode.cs
- ChtmlFormAdapter.cs
- objectresult_tresulttype.cs
- _PooledStream.cs
- CompositeControlDesigner.cs
- XamlFigureLengthSerializer.cs
- ChannelManager.cs
- CounterSetInstance.cs
- RangeContentEnumerator.cs
- SqlConnectionString.cs
- DbTransaction.cs
- OleDbMetaDataFactory.cs
- DatagridviewDisplayedBandsData.cs
- GridItem.cs
- XPathDocument.cs
- XmlSchemaValidator.cs
- TraceSection.cs
- FrameworkRichTextComposition.cs
- HttpInputStream.cs
- FolderLevelBuildProvider.cs
- PostBackOptions.cs
- Relationship.cs
- DataGridViewRowsAddedEventArgs.cs
- UDPClient.cs
- UnionCodeGroup.cs
- UserMapPath.cs
- Peer.cs
- NamespaceTable.cs
- SupportsPreviewControlAttribute.cs
- KeyGesture.cs
- MonthCalendarDesigner.cs
- HMACSHA1.cs
- WebControlParameterProxy.cs
- OracleBinary.cs
- RegexCaptureCollection.cs
- SignatureHelper.cs
- XdrBuilder.cs
- PropertyRecord.cs
- WebPartAddingEventArgs.cs
- Missing.cs
- __Filters.cs
- WebPartDeleteVerb.cs
- OutputWindow.cs
- SqlProfileProvider.cs
- SqlXml.cs
- GridSplitter.cs
- AuthenticationModuleElement.cs