HSLF created presentation incompatibility with Open Office Impress

[Prashant Soni <pr...@gmail.com>]

Hi. I implemented HSLF to write out ppt files. Single slide files open fine
in OpenOffice. However, as soon as I add a second slide, OpenOffice says :
Error loading document file://<documentname>
Version Incompatibility.
Incorrect File Version.

To confirm, I made a test case where the file created by poi contains
nothing but two blank slides. It does not open in OO. Opening in powerpoint
2003 and then a saveas from there (without making any change to the file)
allows it to be opened in OO.

The understandable difference poi browser shows between the file saved from
powerpoint2003 and that created by POI is the number of slides. I managed to
set the number of slides from HSLF source code, but that did not solve the
problem.

Googling for Version Incompatibility with OO Impress tells me that Open
Office does not support powerpoint 95 files. Essentially, this would mean
that some header contains a bit of legacy signature corresponding to
powerpoint95, which needs to be updated.

Any hints on what to do?

Thanks and Regards,


Prashant

Re: HSLF created presentation incompatibility with Open Office Impress

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

On Sat, 25 Nov 2006, Prashant Soni wrote:
> To confirm, I made a test case where the file created by poi contains 
> nothing but two blank slides. It does not open in OO. Opening in 
> powerpoint 2003 and then a saveas from there (without making any change 
> to the file) allows it to be opened in OO.

It'd be interesting to know how the file differs, once powerpoint has 
re-saved it. That might help us figure out what OO doesn't like


> Googling for Version Incompatibility with OO Impress tells me that Open 
> Office does not support powerpoint 95 files. Essentially, this would 
> mean that some header contains a bit of legacy signature corresponding 
> to powerpoint95, which needs to be updated.

I think that OO is giving you an un-helpful / incorrect error message 
here. I don't think there's any powerpoint 95 stuff in POI.

Since OO is open source, you could try asking them for help / stepping 
through it in a debugger. If powerpoint opens the file, but OO doesn't, 
then either OO can fix their code, or tell us how to tweak ours so it 
doesn't break OO.

Nick

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