Description of byte[] from getThumbnail()

[Drew Varner]

Attached is a rough HTML file I wrote that describes the structure of the byte
[] returned by SummaryInformation's getThumbnailMethod() when it is implemented 
like this (simply remove the Exception it currently throws):

    /**
     * <p>Returns the stream's thumbnail (or <code>null</code>)</p>
     */
    public byte[] getThumbnail()
    {
        return (byte[]) getProperty(PropertyIDMap.PID_THUMBNAIL);
    }

Assumptions:
   + A Windows machine saved the info
   + the info is saved in the recommended METAFILE format (Clipboard metafile)

The standard WMF file byte array begins at position 24 of the array (beginning 
of WindowsMetaHeader struct) and ends with the end of the array.
The first 24 bytes are Cliboard specific headers. (VT_CF - Variant Type 
Clipboard Format)

- Drew
___________________
Drew Varner
[EMAIL PROTECTED]

 

	byte[] returned by SummaryInformation.getThumbnail()
Sample Data	71	20660	-1	3	8	?	?	0	1	9
Description	VT_CF Variant Type - Clipbard Format VT_CF==17 Pointer to a CLIPDATA structure	Clipboard Size cbSize is the size of the buffer pointed to by pClipData, plus sizeof(ulClipFmt) cbSize	cftag Clipboard Format Tag -1L a built-in Windows® clipboard format value. -2L Macintosh clipboard format value. -3L A GUID containing a format identifier (FMTID). 0L No data (rarely used)	Format ID If cftag is -1 then this is a DWord descibring the image format 3 CF_METAFILEPICT (Windows Metafile) (recommended) 8 CF_DIB (Device Independent Bitmap) Note: These formats are specific to Clipboard, and Clipboard-specific headers will follow	mm Mapping Mode Value Mapping Mode 1 Text 2 Low Metric 3 High Metric 4 Low English 5 High English 6 Twips 7 Isotropic 8 Anisotropic Table from GFF Format Summary http://www.wvware.com/caolan/ora-wmf.html	Width Width of the Metafile	Height Height of the Metafile	Handle Handle to the Metafile in Memory	FileType 0=memory 1=disk	HeaderSize HeaderSize contains the size of the metafile header in 16-bit WORDs. This value is always 9.
Width	DWord	Unsigned Long	DWord (Long)	DWord	Word	Word	Word	Word	Word	Word
		CLIPDATA Struct
					Clipboard16MetaHeader				WindowsMetaHeader

Infomation taken from http://msdn.microsoft.com and http://www.wvware.com/caolan/ora-wmf.html