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## org.apache.poi.hpsf
Class Thumbnail

    java.lang.Object
      org.apache.poi.hpsf.Thumbnail

public class Thumbnail
extends java.lang.Object

Class to manipulate data in the Clipboard Variant (`VT_CF`) format.

Since:
  2002-04-29
Version:
  $Id: Thumbnail.java,v 1.5.4.1 2004/02/22 11:54:45 glens Exp $
Author:
  Drew Varner (Drew.Varner inOrAround sc.edu)
See Also:
  `SummaryInformation.getThumbnail()`

Field Summary
`static int` | `CF_BITMAP` Clipboard Format - Bitmap
`static int` | `CF_DIB` Clipboard Format - Device Independent Bitmap
`static int` | `CF_ENHMETAFILE` Clipboard Format - Enhanced Windows metafile format
`static int` | `CF_METAFILEPICT` Clipboard Format - Windows metafile format.
`static int` | `CFTAG_FMTID` Clipboard Format Tag - Format ID
`static int` | `CFTAG_MACINTOSH` Clipboard Format Tag - Macintosh clipboard format
`static int` | `CFTAG_NODATA` Clipboard Format Tag - No Data
`static int` | `CFTAG_WINDOWS` Clipboard Format Tag - Windows clipboard format
`static int` | `OFFSET_CF` Offset in bytes where the Clipboard Format starts in the `byte[]` returned by `SummaryInformation.getThumbnail()`
`static int` | `OFFSET_CFTAG` Offset in bytes where the Clipboard Format Tag starts in the `byte[]` returned by `SummaryInformation.getThumbnail()`
`static int` | `OFFSET_WMFDATA` Offset in bytes where the Windows Metafile (WMF) image data starts in the `byte[]` returned by `SummaryInformation.getThumbnail()`

Constructor Summary
`Thumbnail()` Default Constructor.
`Thumbnail(byte[] thumbnailData)` Creates a `Thumbnail` instance and initializes with the specified image bytes.

Method Summary
`long` | `getClipboardFormat()` Returns an `int` representing the Clipboard Format
`long` | `getClipboardFormatTag()` Returns an `int` representing the Clipboard Format Tag
`byte[]` | `getThumbnail()` Returns the thumbnail as a `byte[]` in `VT_CF` format.
`byte[]` | `getThumbnailAsWMF()` Returns the Thumbnail as a `byte[]` of WMF data if the Thumbnail's Clipboard Format Tag is `CFTAG_WINDOWS` and its Clipboard Format is `CF_METAFILEPICT`
`void` | `setThumbnail(byte[] thumbnail)` Sets the Thumbnail's underlying `byte[]` in `VT_CF` format.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### OFFSET_CFTAG

    public static int OFFSET_CFTAG

  Offset in bytes where the Clipboard Format Tag starts in the `byte[]` returned by `SummaryInformation.getThumbnail()`

### OFFSET_CF

    public static int OFFSET_CF

  Offset in bytes where the Clipboard Format starts in the `byte[]` returned by `SummaryInformation.getThumbnail()`

  This is only valid if the Clipboard Format Tag is `CFTAG_WINDOWS`

### OFFSET_WMFDATA

    public static int OFFSET_WMFDATA

  Offset in bytes where the Windows Metafile (WMF) image data starts in the `byte[]` returned by `SummaryInformation.getThumbnail()`

  There is only WMF data at this point in the `byte[]` if the Clipboard Format Tag is `CFTAG_WINDOWS` and the Clipboard Format is `CF_METAFILEPICT`.

  Note: The `byte[]` that starts at `OFFSET_WMFDATA` and ends at `getThumbnail().length - 1` forms a complete WMF image. It can be saved to disk with a `.wmf` file type and read using a WMF-capable image viewer.

### CFTAG_WINDOWS

    public static int CFTAG_WINDOWS

  Clipboard Format Tag - Windows clipboard format

  A `DWORD` indicating a built-in Windows clipboard format value

  See: http://msdn.microsoft.com/library/en-us/dnolegen/html/msdn_propset.asp.

### CFTAG_MACINTOSH

    public static int CFTAG_MACINTOSH

  Clipboard Format Tag - Macintosh clipboard format

  A `DWORD` indicating a Macintosh clipboard format value

  See: http://msdn.microsoft.com/library/en-us/dnolegen/html/msdn_propset.asp.

### CFTAG_FMTID

    public static int CFTAG_FMTID

  Clipboard Format Tag - Format ID

  A GUID containing a format identifier (FMTID). This is rarely used.

  See: http://msdn.microsoft.com/library/en-us/dnolegen/html/msdn_propset.asp.

### CFTAG_NODATA

    public static int CFTAG_NODATA

  Clipboard Format Tag - No Data

  A `DWORD` indicating No data. This is rarely used.

  See: http://msdn.microsoft.com/library/en-us/dnolegen/html/msdn_propset.asp.

### CF_METAFILEPICT

    public static int CF_METAFILEPICT

  Clipboard Format - Windows metafile format. This is the recommended way to store thumbnails in Property Streams.

  Note: This is not the same format used in regular WMF images. The clipboard version of this format has an extra clipboard-specific header.

### CF_DIB

    public static int CF_DIB

  Clipboard Format - Device Independent Bitmap

### CF_ENHMETAFILE

    public static int CF_ENHMETAFILE

  Clipboard Format - Enhanced Windows metafile format

### CF_BITMAP

    public static int CF_BITMAP

  Clipboard Format - Bitmap

  Obsolete, see msdn.microsoft.com/library/en-us/dnw98bk/html/clipboardoperations.asp.

Constructor Detail

### Thumbnail

    public Thumbnail()

  Default Constructor. If you use it then one you'll have to add the thumbnail `byte[]` from `SummaryInformation.getThumbnail()` to do any useful manipulations, otherwise you'll get a `NullPointerException`.

### Thumbnail

    public Thumbnail(byte[] thumbnailData)

  Creates a `Thumbnail` instance and initializes with the specified image bytes.

Parameters:
  `thumbnailData` - The thumbnail data

Method Detail

### getThumbnail

    public byte[] getThumbnail()

  Returns the thumbnail as a `byte[]` in `VT_CF` format.

  Returns:
    The thumbnail value
  See Also:
    `SummaryInformation.getThumbnail()`

### setThumbnail

    public void setThumbnail(byte[] thumbnail)

  Sets the Thumbnail's underlying `byte[]` in `VT_CF` format.

  Parameters:
    `thumbnail` - The new thumbnail value
  See Also:
    `SummaryInformation.getThumbnail()`

### getClipboardFormatTag

    public long getClipboardFormatTag()

  Returns an `int` representing the Clipboard Format Tag

  Possible return values are:

  - `CFTAG_WINDOWS`
  - `CFTAG_MACINTOSH`
  - `CFTAG_FMTID`
  - `CFTAG_NODATA`

  Returns:
    A flag indicating the Clipboard Format Tag

### getClipboardFormat

    public long getClipboardFormat()
                            throws HPSFException

  Returns an `int` representing the Clipboard Format

  Will throw an exception if the Thumbnail's Clipboard Format Tag is not `CFTAG_WINDOWS`.

  Possible return values are:

  - `CF_METAFILEPICT`
  - `CF_DIB`
  - `CF_ENHMETAFILE`
  - `CF_BITMAP`

  Returns:
    a flag indicating the Clipboard Format
  Throws:
    `HPSFException` - if the Thumbnail isn't CFTAG_WINDOWS

### getThumbnailAsWMF

    public byte[] getThumbnailAsWMF()
                             throws HPSFException

  Returns the Thumbnail as a `byte[]` of WMF data if the Thumbnail's Clipboard Format Tag is `CFTAG_WINDOWS` and its Clipboard Format is `CF_METAFILEPICT`

  This `byte[]` is in the traditional WMF file, not the clipboard-specific version with special headers.

  See http://www.wvware.com/caolan/ora-wmf.html for more information on the WMF image format.

  Returns:
    A WMF image of the Thumbnail
  Throws:
    `HPSFException` - if the Thumbnail isn't CFTAG_WINDOWS and CF_METAFILEPICT

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Copyright © 2003 Apache Software Foundation.