I'm using Ruby for displaying the contents of powerpoint files in a webpage. I've found solutions using the win32ole but I'm in the linux environment and it doesn't work. I think the application could trigger a openoffice command for conversion.
I recommend using Docsplit.
Install the gem, and then you can do something like:
Docsplit.extract_images(filename, :size => '920x', :format => [:png])
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