ReplaceString example

[Alan Thomas <ja...@verizon.net>]

    I used the ReplaceString example that comes with PDFBox on a PDF file I
have.  However, it does not find the text I want to replace.

 

   In looking at the code and putting in some debugging statements, I found
out that the code was looking for a "PDFOperator" operation 

(from the getOperation() method) of "Tj" and "TJ".  However, my PDF file has
neither.  

 

     Question:   Where can I find the list of all the operators that display
strings in a PDF file?  (Or is there an easier way to search and replace
strings?)

 

                              Thanks, Alan 

 

PDFOperator op = (PDFOperator)next;

                        //Tj and TJ are the two operators that display

                        //strings in a PDF

                        if( op.getOperation().equals( "Tj" ) )

 

 

 

Re: ReplaceString example

[Andreas Lehmkuehler <an...@lehmi.de>]

Hi,

Am 29.12.2010 03:33, schrieb Alan Thomas:
>      I used the ReplaceString example that comes with PDFBox on a PDF file I
> have.  However, it does not find the text I want to replace.
>
>
>
>     In looking at the code and putting in some debugging statements, I found
> out that the code was looking for a "PDFOperator" operation
Correct.

> (from the getOperation() method) of "Tj" and "TJ".  However, my PDF file has
> neither.
>
>
>
>       Question:   Where can I find the list of all the operators that display
> strings in a PDF file?  (Or is there an easier way to search and replace
> strings?)
Textcontent may be defined in different ways within pdfs. In most cases text 
will be splitted into several chunks. They often consist of one or more 
characters, but not necessarily whole words or lines of text. Consequently one 
has to combine all these text chunks to identify the given text. The 
PDFTextStripper class [1] works like that.

Have a look at the PDF reference at [2] section 9.3 "Text State Parameters and 
Operators" for further information.


BR
Andreas Lehmkühler
[1] 
http://svn.apache.org/repos/asf/pdfbox/trunk/pdfbox/src/main/java/org/apache/pdfbox/util/PDFTextStripper.java
[2] http://www.adobe.com/devnet/pdf/pdf_reference.html