Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / whidbey / NetFXspW7 / 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. // //----------------------------------------------------------------------------- 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
- OutKeywords.cs
- DataTableCollection.cs
- WizardForm.cs
- ChangeBlockUndoRecord.cs
- WorkflowDesigner.cs
- ParallelTimeline.cs
- CompiledWorkflowDefinitionContext.cs
- KeyInterop.cs
- SecUtil.cs
- ScriptManagerProxy.cs
- PkcsUtils.cs
- DocumentViewer.cs
- ScriptingRoleServiceSection.cs
- XmlEntityReference.cs
- ListViewHitTestInfo.cs
- VersionUtil.cs
- ExpressionConverter.cs
- RegexRunnerFactory.cs
- Facet.cs
- QueryContinueDragEvent.cs
- NavigationProperty.cs
- XPathAncestorQuery.cs
- SmtpSpecifiedPickupDirectoryElement.cs
- EntityDataSourceDesigner.cs
- DefaultPropertyAttribute.cs
- DataBindingHandlerAttribute.cs
- metadatamappinghashervisitor.hashsourcebuilder.cs
- DbParameterCollectionHelper.cs
- XmlnsCompatibleWithAttribute.cs
- DataListCommandEventArgs.cs
- RelationalExpressions.cs
- EventRouteFactory.cs
- BuildResultCache.cs
- ViewRendering.cs
- _NegoStream.cs
- DbException.cs
- Action.cs
- TransmissionStrategy.cs
- MenuBindingsEditor.cs
- MatrixIndependentAnimationStorage.cs
- XmlObjectSerializerReadContextComplexJson.cs
- HostSecurityManager.cs
- AnchoredBlock.cs
- Typography.cs
- XmlNamespaceManager.cs
- EntitySqlQueryBuilder.cs
- StylesEditorDialog.cs
- ClientUtils.cs
- SynchronizationContextHelper.cs
- QueuedDeliveryRequirementsMode.cs
- XmlChoiceIdentifierAttribute.cs
- XmlDocumentFragment.cs
- ApplicationFileParser.cs
- Point3DKeyFrameCollection.cs
- SqlUserDefinedAggregateAttribute.cs
- UInt64.cs
- SynchronizedInputAdaptor.cs
- Bind.cs
- DateRangeEvent.cs
- SafeEventLogWriteHandle.cs
- MemberAssignment.cs
- FormViewInsertEventArgs.cs
- ParseHttpDate.cs
- EmbeddedObject.cs
- Floater.cs
- ColumnClickEvent.cs
- XmlUrlResolver.cs
- DropDownButton.cs
- ToolStripDropDownMenu.cs
- WindowsEditBoxRange.cs
- AuthorizationBehavior.cs
- basemetadatamappingvisitor.cs
- HttpInputStream.cs
- XsdBuilder.cs
- SrgsRule.cs
- AnnouncementInnerClient11.cs
- Color.cs
- DataGridViewRowHeaderCell.cs
- ProcessThreadCollection.cs
- ComponentEditorForm.cs
- DataViewManager.cs
- TaiwanLunisolarCalendar.cs
- TextTreeObjectNode.cs
- XmlNodeChangedEventArgs.cs
- SoapEnumAttribute.cs
- MergeLocalizationDirectives.cs
- DoubleUtil.cs
- GCHandleCookieTable.cs
- TextWriterTraceListener.cs
- HelpEvent.cs
- AtomContentProperty.cs
- DbQueryCommandTree.cs
- SvcFileManager.cs
- RuntimeHelpers.cs
- UrlMappingsModule.cs
- XmlSchemaAppInfo.cs
- ApplicationTrust.cs
- AspProxy.cs
- EmbeddedMailObject.cs
- QueryOperator.cs