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.
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