BN089-BS开发框架MVC4版/source20131023/Zephyr.Net/Zephyr.Utils/Document/Excel/NPOI/HPSF/Thumbnail.cs

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/* ====================================================================
   Licensed To the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for Additional information regarding copyright ownership.
   The ASF licenses this file To You under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with
   the License.  You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed To in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
==================================================================== */

/* ================================================================
 * About NPOI
 * Author: Tony Qu 
 * Author's email: tonyqus (at) gmail.com 
 * Author's Blog: tonyqus.wordpress.com.cn (wp.tonyqus.cn)
 * HomePage: http://www.codeplex.com/npoi
 * Contributors:
 * 
 * ==============================================================*/

namespace Zephyr.Utils.NPOI.HPSF
{
    using System;
    using Zephyr.Utils.NPOI.Util;

    /// <summary>
    /// Class To manipulate data in the Clipboard Variant (Variant#VT_CF VT_CF) format.
    /// @author Drew Varner (Drew.Varner inOrAround sc.edu)
    /// @since 2002-04-29
    /// </summary>
    public class Thumbnail
    {
        /// <summary>
        /// OffSet in bytes where the Clipboard Format Tag starts in the <c>byte[]</c> returned by SummaryInformation#GetThumbnail()
        /// </summary>
        public const int OFFSet_CFTAG = 4;

        /// <summary>
        /// OffSet in bytes where the Clipboard Format starts in the <c>byte[]</c> returned by SummaryInformation#GetThumbnail()
        /// </summary>
        /// <remarks>This is only valid if the Clipboard Format Tag is CFTAG_WINDOWS</remarks>
        public const int OFFSet_CF = 8;

        /// <summary>
        /// OffSet in bytes where the Windows Metafile (WMF) image data starts in the <c>byte[]</c> returned by SummaryInformation#GetThumbnail()
        /// There is only WMF data at this point in the
        /// <c>byte[]</c> if the Clipboard Format Tag is
        /// CFTAG_WINDOWS and the Clipboard Format is 
        /// CF_METAFILEPICT.
        /// </summary>
        /// <remarks>Note: The <c>byte[]</c> that starts at
        /// <c>OFFSet_WMFDATA</c> and ends at
        /// <c>GetThumbnail().Length - 1</c> forms a complete WMF