For this, a lookup table for each font is (optionally) embedded within the PDF, that maps internal encoding to some known/standard encoding (typically unicode).For example, in your PDF you'd find tables such as (after having uncompressed it with pdftk (the left column is the internal encoding, the right one the unicode codepoints) In case you're interested in the details, you might want to read chapter 5 of the PDF Reference, in particular section 5.9 "Extraction of Text Content" and 5.6 "Composite Fonts" Actually, in practice this stuff can get pretty complex (for example with True Type fonts), which is why most free tools just don't care to implement it properly (or at all).(Actually, this is simplified slightly, and the individual techniques vary somewhat &mdash but this description should suffice to explain the problem.) The issue is that, in order to get back at the textual content, you need additional info, i.e.the reverse mapping from the internally used encoding to the characters being represented.by Penny Talbot It feels odd interviewing someone I have known almost all my life, but my conscience and better judgement tells me I should probably refrain from writing about my dear friends and fellow boaters Cam and Kim Kemp, without at least attempting to get their side of the story. 1) Cam / Kim – can you tell us about how and why you started out with boating, and what precipitated your move from a large fast power boat ( their first boat, I might add) to a larger, slower, and much more stable trawler? ), our first power boating experience was chartering a Bayliner and heading up the BC coast with a group of “long time boater” friends in their boats.
Instead, a new derived mini font is embedded containing nothing but those four glyphs.
Last week I told you that on average a Blue Tit chick can eat up to 100 caterpillar grubs a day.
That is a lot for an adult bird to find and collect when they [...] Click here to play Read by Matthew At this time of year it is important that birds can find the right food for their growing chicks.
Using CAM:: PDF, you can parse the document and find the string that corresponds to what you're looking for.
You might want to look at the source for Test:: PDF which uses CAM:: PDF to verify that two PDFs contain the same data and structure and see what stvn does there.