Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / WinForms / Managed / System / WinForms / DataStreamFromComStream.cs / 1305376 / 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.
Link Menu

This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- InternalDispatchObject.cs
- Deflater.cs
- ResourceReferenceExpressionConverter.cs
- GridErrorDlg.cs
- SettingsPropertyValue.cs
- ConnectivityStatus.cs
- bindurihelper.cs
- PersonalizationProvider.cs
- Ray3DHitTestResult.cs
- EntityProviderServices.cs
- TerminateDesigner.cs
- EncryptedReference.cs
- IntersectQueryOperator.cs
- PointUtil.cs
- InvalidComObjectException.cs
- WsdlImporterElement.cs
- LifetimeServices.cs
- Condition.cs
- Exception.cs
- EncryptedKeyHashIdentifierClause.cs
- RegexBoyerMoore.cs
- IssuedTokenClientBehaviorsElement.cs
- MatrixAnimationUsingKeyFrames.cs
- ReaderOutput.cs
- _AuthenticationState.cs
- DBDataPermission.cs
- WindowsMenu.cs
- GiveFeedbackEvent.cs
- SemanticResultValue.cs
- TextBox.cs
- TextElementAutomationPeer.cs
- OpenTypeCommon.cs
- AssemblyHelper.cs
- SpeechRecognizer.cs
- ButtonField.cs
- EventWaitHandleSecurity.cs
- Application.cs
- Predicate.cs
- StylusButtonCollection.cs
- FilePrompt.cs
- UndoManager.cs
- TrustManagerPromptUI.cs
- DirectoryInfo.cs
- PropertyEmitter.cs
- TableHeaderCell.cs
- Claim.cs
- ObjectListTitleAttribute.cs
- RemotingClientProxy.cs
- FileSystemEnumerable.cs
- SiteMapSection.cs
- ScopelessEnumAttribute.cs
- InkPresenter.cs
- TriggerAction.cs
- RightNameExpirationInfoPair.cs
- ReachPageContentCollectionSerializerAsync.cs
- Codec.cs
- Trace.cs
- dataprotectionpermission.cs
- _SafeNetHandles.cs
- CommandID.cs
- regiisutil.cs
- RecordManager.cs
- Rotation3DKeyFrameCollection.cs
- ClosureBinding.cs
- EdmMember.cs
- StateManagedCollection.cs
- DrawingContextWalker.cs
- CrossContextChannel.cs
- RuleConditionDialog.cs
- SystemIPAddressInformation.cs
- RotateTransform.cs
- XmlSerializerVersionAttribute.cs
- Model3D.cs
- AsyncResult.cs
- DefaultBinder.cs
- BaseHashHelper.cs
- GlobalProxySelection.cs
- CodeLinePragma.cs
- DoWorkEventArgs.cs
- XpsFixedPageReaderWriter.cs
- ImageMap.cs
- TextServicesHost.cs
- XPathSelfQuery.cs
- StackBuilderSink.cs
- StatusBarAutomationPeer.cs
- MultiView.cs
- DrawTreeNodeEventArgs.cs
- InProcStateClientManager.cs
- SamlAdvice.cs
- InheritanceRules.cs
- DBSchemaRow.cs
- AccessorTable.cs
- _RequestCacheProtocol.cs
- SafeThreadHandle.cs
- Clock.cs
- KeyTimeConverter.cs
- TagMapInfo.cs
- ToolStripItemDesigner.cs
- SQlBooleanStorage.cs
- CommandHelper.cs