Extracting alt text from images using HWPF

[Jo...@act.org]

Is it possible to get the alternative text for an image using HWPF? I am 
currently using POI 3.8 and have not been able to find where this is 
stored in the HWPFDocument. I would expect it to be part of 
org.apache.poi.hwpf.usermodel.Picture but there does not seem to be any 
methods to return alt text.

Re: Extracting alt text from images using HWPF

[Jo...@act.org]

Patch submitted.
Bug ID 53165.

Re: Extracting alt text from images using HWPF

[Nick Burch <ni...@alfresco.com>]

On Sat, 28 Apr 2012, Josh.Holthaus@act.org wrote:
> I did come up with a way to get the alt text from the properties of a 
> picture.

Would you be able to work up a patch for HWPF that exposes this 
description from the picture itself?

Also, for turning the bytes into a String, you might find it better to use 
StringUtil to do it, rather than coding your own

Nick

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Re: Extracting alt text from images using HWPF

[Jo...@act.org]

I did come up with a way to get the alt text from the properties of a 
picture.

/**
 * Returns the alternative text stored in the EscherProperties
 * @param picture
 * @return
 */
public static String getAltText(Picture picture){
        PICFAndOfficeArtData picfAndOfficeArtData = null;
        try{
                Field field = picture.getClass().getDeclaredField(
"_picfAndOfficeArtData");
                field.setAccessible(true);
                picfAndOfficeArtData = (PICFAndOfficeArtData) 
field.get(picture);
        }catch(Exception e){
                logger.error("Unable to get _picfAndOfficeArtData",e);
                throw new RuntimeException(e);
        }
 
        for(EscherRecord escherRecord : 
picfAndOfficeArtData.getShape().getChildRecords()){
                if(escherRecord instanceof EscherOptRecord){
                        EscherOptRecord escherOptRecord = 
(EscherOptRecord) escherRecord;
                        for(EscherProperty property : 
escherOptRecord.getEscherProperties()){
                                if(EscherProperties.
GROUPSHAPE__DESCRIPTION == property.getPropertyNumber()){
                                        byte[] complexData = 
((EscherComplexProperty)property).getComplexData();
                                        byte[] altTextData = new byte
[(complexData.length/2)-1];
                                        for(int i=0; i<altTextData.length
;i++){
                                                altTextData[i] = 
complexData[i*2];
                                        }
 
                                        return new String(altTextData);
                        }
                        }
                }
        }
 
        return null;
}