Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / DataStreamFromComStream.cs / 1 / DataStreamFromComStream.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Windows.Forms { using System.Runtime.InteropServices; using System.Diagnostics; using System; using System.IO; ////// /// /// internal class DataStreamFromComStream : Stream { private UnsafeNativeMethods.IStream comStream; public DataStreamFromComStream(UnsafeNativeMethods.IStream comStream) : base() { this.comStream = comStream; } public override long Position { get { return Seek(0, SeekOrigin.Current); } set { Seek(value, SeekOrigin.Begin); } } public override bool CanWrite { get { return true; } } public override bool CanSeek { get { return true; } } public override bool CanRead { get { return true; } } public override long Length { get { long curPos = this.Position; long endPos = Seek(0, SeekOrigin.End); this.Position = curPos; return endPos - curPos; } } /* private void _NotImpl(string message) { NotSupportedException ex = new NotSupportedException(message, new ExternalException(SR.GetString(SR.ExternalException), NativeMethods.E_NOTIMPL)); throw ex; } */ private unsafe int _Read(void* handle, int bytes) { return comStream.Read((IntPtr)handle, bytes); } private unsafe int _Write(void* handle, int bytes) { return comStream.Write((IntPtr)handle, bytes); } public override void Flush() { } public unsafe override int Read(byte[] buffer, int index, int count) { int bytesRead = 0; if (count > 0 && index >= 0 && (count + index) <= buffer.Length) { fixed (byte* ch = buffer) { bytesRead = _Read((void*)(ch + index), count); } } return bytesRead; } public override void SetLength(long value) { comStream.SetSize(value); } public override long Seek(long offset, SeekOrigin origin) { return comStream.Seek(offset, (int)origin); } public unsafe override void Write(byte[] buffer, int index, int count) { int bytesWritten = 0; if (count > 0 && index >= 0 && (count + index) <= buffer.Length) { try { fixed (byte* b = buffer) { bytesWritten = _Write((void*)(b + index), count); } } catch { } } if (bytesWritten < count) { throw new IOException(SR.GetString(SR.DataStreamWrite)); } } protected override void Dispose(bool disposing) { try { if (disposing && comStream != null) { try { comStream.Commit(NativeMethods.STGC_DEFAULT); } catch(Exception) { } } // Can't release a COM stream from the finalizer thread. comStream = null; } finally { base.Dispose(disposing); } } ~DataStreamFromComStream() { Dispose(false); } } } // 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
- TextSpanModifier.cs
- RawStylusActions.cs
- X509ChainPolicy.cs
- WSHttpBindingBaseElement.cs
- ConfigurationManagerHelperFactory.cs
- WindowsFormsSectionHandler.cs
- Panel.cs
- ScrollChrome.cs
- EventLogPermissionEntryCollection.cs
- BuildProvider.cs
- WebPartExportVerb.cs
- Input.cs
- MappedMetaModel.cs
- XamlTreeBuilder.cs
- ToolBar.cs
- TextTreeInsertUndoUnit.cs
- DataListItemCollection.cs
- UrlMapping.cs
- DetailsViewActionList.cs
- UIElementParagraph.cs
- DurableErrorHandler.cs
- HtmlHead.cs
- ImageCodecInfo.cs
- TrustManagerMoreInformation.cs
- FontCollection.cs
- DetailsViewModeEventArgs.cs
- WebPartTransformerCollection.cs
- HandlerElement.cs
- EditorPartChrome.cs
- TheQuery.cs
- sqlnorm.cs
- BuilderInfo.cs
- WebCategoryAttribute.cs
- InkCanvasSelectionAdorner.cs
- EntityDataSourceContainerNameConverter.cs
- AutoSizeToolBoxItem.cs
- XamlPointCollectionSerializer.cs
- XmlCharCheckingWriter.cs
- RefreshEventArgs.cs
- DataRowCollection.cs
- WebEvents.cs
- WinEventWrap.cs
- CompositeFontParser.cs
- SettingsPropertyValueCollection.cs
- UnsafeNativeMethodsCLR.cs
- DateTimeStorage.cs
- ToolStripItemClickedEventArgs.cs
- DeleteBookmarkScope.cs
- WebPartsSection.cs
- BooleanFacetDescriptionElement.cs
- PackageDigitalSignature.cs
- TableColumnCollection.cs
- PresentationSource.cs
- Model3D.cs
- SqlCommandBuilder.cs
- OleDbParameterCollection.cs
- CqlErrorHelper.cs
- RoleManagerModule.cs
- ControlAdapter.cs
- VisualStyleInformation.cs
- DragCompletedEventArgs.cs
- MemberProjectedSlot.cs
- SafePEFileHandle.cs
- IUnknownConstantAttribute.cs
- GeometryGroup.cs
- DoWorkEventArgs.cs
- XD.cs
- MarkupCompilePass1.cs
- RijndaelCryptoServiceProvider.cs
- AllowedAudienceUriElement.cs
- DataGridViewLinkCell.cs
- ScaleTransform.cs
- TextFormatterContext.cs
- HtmlButton.cs
- DataListCommandEventArgs.cs
- ZipIOExtraField.cs
- ValidationPropertyAttribute.cs
- BamlLocalizableResourceKey.cs
- DecimalAnimationBase.cs
- ContextMenuStrip.cs
- TerminatorSinks.cs
- EncryptedKey.cs
- MimeTypeAttribute.cs
- BitmapEffectInputData.cs
- CodeAttributeDeclarationCollection.cs
- ShutDownListener.cs
- OdbcConnectionOpen.cs
- Query.cs
- ItemCollection.cs
- ApplicationContext.cs
- FixedDocumentSequencePaginator.cs
- ObjectDisposedException.cs
- TextDecoration.cs
- SyndicationSerializer.cs
- CharacterBufferReference.cs
- IFormattable.cs
- ToolZone.cs
- DataSysAttribute.cs
- ConnectionPointCookie.cs
- XmlAutoDetectWriter.cs