On Sat, 29 Apr 2006, Mihali A. Felipe wrote:
Hi. I'm new to POI and am getting a little perplexed. I'm trying to do something seemingly simple - getting text from each slide in sequence while keeping track of which slide the text is from. However, the slides do not show up in sequence (and it seems like some slides are repeated e.g. try it on http://www.gersteinlab.org/lectures/ppt/A2K-at-Yale-20060422.ppt).
Also, I don't know where/how to get the real slide number.
Alas, nor do we. Each core record (Document, Slide, Notes, MainMaster etc) has a unique ID. This ID is used by the PersistPtr stuff, so it can look up that ID to an actual record in the file. This same number is also used to link a Notes back to its Slide.
I'd assumed that this number might bear some relation to the slide ordering. It turns out that the numbering is based on the order the slides were added in, and when you re-order, it isn't updated.
So, until we can figure out where PowerPoint does store the slide ordering, we can't return the slides in that order.
If you can find another open source powerpoint reader (that isn't OpenOffice, since that has brain hurting code) that does get the slides in the right order, can you let us know? We can then take a look through their code, and try to figure out what record / records are used for the slide ordering.
P.S. Why does getSheetNumber() keep giving me -1?
On a recent SVN checkout, it should give you one higher than the slide's position in the array of slides. Are you sure you have a recent enough copy of POI?
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