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
- HijriCalendar.cs
- MultipleFilterMatchesException.cs
- WebPartMinimizeVerb.cs
- ResourceDescriptionAttribute.cs
- ProcessHostFactoryHelper.cs
- ConfigurationStrings.cs
- securitycriticaldata.cs
- ComPersistableTypeElementCollection.cs
- AbandonedMutexException.cs
- LockCookie.cs
- DataGridViewHeaderCell.cs
- HelpEvent.cs
- ExtensionSimplifierMarkupObject.cs
- DisableDpiAwarenessAttribute.cs
- diagnosticsswitches.cs
- ActivationServices.cs
- EntityDataSourceDesigner.cs
- SafeNativeMethods.cs
- ConversionValidationRule.cs
- FaultDesigner.cs
- SubMenuStyle.cs
- ProfilePropertySettings.cs
- TextReader.cs
- DocumentEventArgs.cs
- EncryptedData.cs
- OleCmdHelper.cs
- Int32AnimationBase.cs
- SqlConnectionStringBuilder.cs
- Reference.cs
- SecurityKeyUsage.cs
- Privilege.cs
- DependencyPropertyKey.cs
- ActivityCodeDomSerializer.cs
- OdbcFactory.cs
- ActivityExecutorSurrogate.cs
- Journaling.cs
- PowerStatus.cs
- BlurBitmapEffect.cs
- LogFlushAsyncResult.cs
- CapabilitiesSection.cs
- mediapermission.cs
- ObjectDataSourceView.cs
- Comparer.cs
- SiteOfOriginPart.cs
- RtfControlWordInfo.cs
- WebConfigurationFileMap.cs
- AdjustableArrowCap.cs
- RangeValuePattern.cs
- ListSortDescription.cs
- BindingContext.cs
- MulticastDelegate.cs
- HandleCollector.cs
- QueryOpcode.cs
- WindowsServiceElement.cs
- XmlExpressionDumper.cs
- NavigationHelper.cs
- TextEndOfParagraph.cs
- DataServiceRequest.cs
- SchemaDeclBase.cs
- WindowsStatusBar.cs
- TextBreakpoint.cs
- sqlinternaltransaction.cs
- SettingsBindableAttribute.cs
- FigureParaClient.cs
- BitmapCodecInfoInternal.cs
- HierarchicalDataSourceConverter.cs
- ProcessHostConfigUtils.cs
- ToolStripTextBox.cs
- TypedDataSetSchemaImporterExtension.cs
- DBConcurrencyException.cs
- BindingCollection.cs
- DataTableNameHandler.cs
- ViewUtilities.cs
- ListSourceHelper.cs
- SqlVisitor.cs
- WebHttpSecurityElement.cs
- ScopeCompiler.cs
- StringDictionary.cs
- EntityReference.cs
- EntitySetBaseCollection.cs
- Int16.cs
- ObjectRef.cs
- BuildProvider.cs
- MediaEntryAttribute.cs
- BamlBinaryReader.cs
- Separator.cs
- PriorityQueue.cs
- WorkflowHostingEndpoint.cs
- SessionPageStateSection.cs
- ObjectViewFactory.cs
- RadioButtonStandardAdapter.cs
- assemblycache.cs
- WebControlAdapter.cs
- HtmlHead.cs
- DrawingContextDrawingContextWalker.cs
- AuthenticationServiceManager.cs
- TcpHostedTransportConfiguration.cs
- NullReferenceException.cs
- InternalResources.cs
- SQLInt64.cs