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
- ProjectionCamera.cs
- EntityDataSourceMemberPath.cs
- EditorPart.cs
- DefaultSettingsSection.cs
- ActivityExecutorSurrogate.cs
- Int32EqualityComparer.cs
- DataServices.cs
- FocusManager.cs
- OracleTimeSpan.cs
- StrokeRenderer.cs
- RoutedEventHandlerInfo.cs
- MetadataArtifactLoaderCompositeFile.cs
- MDIWindowDialog.cs
- ExecutionScope.cs
- DataGridViewAutoSizeColumnsModeEventArgs.cs
- ClosableStream.cs
- ClrProviderManifest.cs
- ProjectionPlanCompiler.cs
- UnsafeNativeMethods.cs
- DataGridViewCellStyleChangedEventArgs.cs
- Command.cs
- MDIControlStrip.cs
- HandlerWithFactory.cs
- XamlTemplateSerializer.cs
- DescendantOverDescendantQuery.cs
- DataListDesigner.cs
- XamlBrushSerializer.cs
- HtmlTextViewAdapter.cs
- MdbDataFileEditor.cs
- EventSinkHelperWriter.cs
- OperationContext.cs
- HostingEnvironment.cs
- Size3D.cs
- PerformanceCounterLib.cs
- PrinterResolution.cs
- Point3DKeyFrameCollection.cs
- designeractionlistschangedeventargs.cs
- XmlObjectSerializerWriteContext.cs
- SoapTypeAttribute.cs
- HtmlContainerControl.cs
- WsdlBuildProvider.cs
- SoapSchemaExporter.cs
- DataSourceControlBuilder.cs
- MLangCodePageEncoding.cs
- EventDescriptor.cs
- Style.cs
- MembershipValidatePasswordEventArgs.cs
- EpmContentDeSerializer.cs
- CodeTypeParameterCollection.cs
- CompositeFontFamily.cs
- ToolStripProfessionalLowResolutionRenderer.cs
- PageAdapter.cs
- WebDisplayNameAttribute.cs
- ToolboxBitmapAttribute.cs
- TableRow.cs
- ExtensionSimplifierMarkupObject.cs
- SystemEvents.cs
- IriParsingElement.cs
- TextTreeTextNode.cs
- WindowsTokenRoleProvider.cs
- SqlProcedureAttribute.cs
- PersonalizableTypeEntry.cs
- RC2CryptoServiceProvider.cs
- HttpListenerRequestTraceRecord.cs
- WsdlInspector.cs
- ProtocolElementCollection.cs
- contentDescriptor.cs
- ProfileEventArgs.cs
- QilInvoke.cs
- SmiContextFactory.cs
- ContentHostHelper.cs
- XamlInterfaces.cs
- SettingsPropertyIsReadOnlyException.cs
- Paragraph.cs
- X509Certificate2.cs
- BamlBinaryReader.cs
- ObfuscationAttribute.cs
- ColorInterpolationModeValidation.cs
- MimeReturn.cs
- InstallerTypeAttribute.cs
- FileLogRecordEnumerator.cs
- EntityContainer.cs
- Rotation3DKeyFrameCollection.cs
- CacheAxisQuery.cs
- RemotingSurrogateSelector.cs
- OdbcDataReader.cs
- QueryExpression.cs
- Transactions.cs
- DataGridViewCellToolTipTextNeededEventArgs.cs
- OleDbErrorCollection.cs
- NativeCompoundFileAPIs.cs
- HtmlTextArea.cs
- TextServicesDisplayAttribute.cs
- ArgumentException.cs
- DataBoundControl.cs
- TransformerInfo.cs
- ImageMap.cs
- COM2PictureConverter.cs
- ISessionStateStore.cs
- StateDesignerConnector.cs