Thumbnail (POI API Documentation)

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

```
public final class Thumbnail
extends java.lang.Object
```
Class to manipulate data in the Clipboard Variant (VT_CF) format.

See Also:

SummaryInformation.getThumbnail(), Clipboard Operations

Field Summary

Fields
Modifier and Type	Field and Description
`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

Constructors
Constructor and Description

Thumbnail()
Default Constructor.

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

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

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`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 final int OFFSET_CFTAG
```
    Offset in bytes where the Clipboard Format Tag starts in the byte[] returned by SummaryInformation.getThumbnail()
    
    See Also:
    
    Constant Field Values
  - OFFSET_CF
```
public static final 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
    
    See Also:
    
    Constant Field Values
  - OFFSET_WMFDATA
```
public static final 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.
    
    See Also:
    
    Constant Field Values
  - CFTAG_WINDOWS
```
public static final int CFTAG_WINDOWS
```
    Clipboard Format Tag - Windows clipboard format
    
    A DWORD indicating a built-in Windows clipboard format value
    
    See Also:
    
    Constant Field Values
  - CFTAG_MACINTOSH
```
public static final int CFTAG_MACINTOSH
```
    Clipboard Format Tag - Macintosh clipboard format
    
    A DWORD indicating a Macintosh clipboard format value
    
    See Also:
    
    Constant Field Values
  - CFTAG_FMTID
```
public static final int CFTAG_FMTID
```
    Clipboard Format Tag - Format ID
    
    A GUID containing a format identifier (FMTID). This is rarely used.
    
    See Also:
    
    Constant Field Values
  - CFTAG_NODATA
```
public static final int CFTAG_NODATA
```
    Clipboard Format Tag - No Data
    
    A DWORD indicating No data. This is rarely used.
    
    See Also:
    
    Constant Field Values
  - CF_METAFILEPICT
```
public static final 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.
    
    See Also:
    
    Constant Field Values
  - CF_DIB
```
public static final int CF_DIB
```
    Clipboard Format - Device Independent Bitmap
    
    See Also:
    
    Constant Field Values
  - CF_ENHMETAFILE
```
public static final int CF_ENHMETAFILE
```
    Clipboard Format - Enhanced Windows metafile format
    
    See Also:
    
    Constant Field Values
  - CF_BITMAP
```
public static final int CF_BITMAP
```
    Clipboard Format - Bitmap
    
    See Also:
    
    Constant Field Values
- 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:
    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:
    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

Class Thumbnail

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

OFFSET_CFTAG

OFFSET_CF

OFFSET_WMFDATA

CFTAG_WINDOWS

CFTAG_MACINTOSH

CFTAG_FMTID

CFTAG_NODATA

CF_METAFILEPICT

CF_DIB

CF_ENHMETAFILE

CF_BITMAP

Constructor Detail

Thumbnail

Thumbnail

Method Detail

getThumbnail

setThumbnail

getClipboardFormatTag

getClipboardFormat

getThumbnailAsWMF