Op 31/07/2013 15:57, Ke Xu schreef:
> How to use iTextAsian.dll and iTextAsianCmaps.dll when i try to 
> extract CJK text and write CJK text into PDF file?

iTextAsian and iTextAsianCmaps contain metrics files necessary to 
*create* documents containing CJK fonts. You don't need them to extract 
CJK text. You didn't answer Paulo's question yet though: if you open the 
document in Adobe Reader, can you copy/paste the text correctly? If not, 
there's a clear indication that one of the following situations applies:
  (a) the text is present as vector shapes drawn using PDF syntax, NOT 
as real text using a font, or
  (b) the text is drawn using a font, but the font has a strange 
encoding that doesn't allow translation of the characters to Unicode. 
For instance: in a Type3 font, you can pick your characters at random 
and have them point to whatever glyph you want.
  (c) the text is drawn using a font that does allow extraction, but the 
PDF uses obsolete ways to mimic styles, such as: printing the same 
character multiple times to mimic a bold font.

In these cases, there's no way you'll be able to extract the text 
correctly, not using iText, not using any other library.

In these case, you need to OCR the document!

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