Hi, Opening existing PDF files, adding annotations to them and saving them is perfectly doable using PoDoFo, even if for example font encodings are not supported directly.
PoDoFo supports any kind of PDF annotation, only the basic ones are supported
using the API though. You can create any other annotation by adding the keys
and values described in the PDF Reference to the dictionary returned by
PdfAnnotation::GetObject()->GetDictionary().
Adding API support for other annotations is merely a matter of adding getters
and setters for the keys and values you would add otherwise directly to the
dictionary as described above.
Best regards,
Dom
Am Montag 03 Mai 2010 schrieb xteo:
> Hi ,
>
> I need to asses how much time doing this plus implementing it into my app
> is gonna take before I start going that direction, but I think its
> something I might be able to do.
> I have currently left this feature on my "Maybe list" until I can see if I
> will have time .
>
> looking at the feature set of PoDoFo I was also very interested into the
> Annotation feature .
>
> here is was I would like to be able to do :
>
> Open a PDF
> go to specific pages and add Annotation ( of several kinds ) and save back
> the PDF .
>
> is that something PoDoFo can do ? even if some part of the documents ( like
> fonts ) are not supported by PoDoFo ?
>
> reading the documentation and the code I notice that not all Annotation
> type are supported, if that still the case. It seams that the basic one
> are supported already that is great, how much work is involve in
> supporting some other one ? I can't really see what is missing ?
>
> Thanks a lot
>
> Damien
>
> On 3 May 2010, at 22:35, Dominik Seichter wrote:
> > Hi,
> >
> > I think the issue is always that PdfEncodingFactory is unable to create a
> > encoding for most fonts. I changed current SVN to throw an exception
> > instead of returning a NULL pointer. This should prevent the crashes, at
> > least.
> >
> > If you really need this feature, I suggest fixing PdfEncodingFactory to
> > be able to create the encodings used in your fonts.
> > Still, there might be some changes necessary to PdfFontMetrics to allow
> > creating every kind of font from the font data embedded in the PDF file,
> > but I think getting the encodings done is the first step.
> >
> > Best regards,
> > Dom
> >
> > Am Sonntag 02 Mai 2010 schrieb xteo:
> >> Hi
> >>
> >> I was looking into it more yesterday night and also found some case
> >> where TrueType font are crashing
> >>
> >> Currently the main reason I would like to have the font is to determine
> >> the length of the character into a BT/ET block
> >>
> >> I have search functionality in my app where I have a copy of the text
> >> per page and search that , but once I take the user to the right page l
> >> would like to highlight the search result block
> >>
> >> At the moment i can scan manually the code to get the start location of
> >> each text block and their size but without the font information I can't
> >> find where the text end , also if my search result was in the middle of
> >> a text block I would need to calculate where the part of the text I need
> >> to highlight start
> >>
> >> Once have figure that out I think it will also be quite easy to
> >> implement annotation in my application and also text selection / copy
> >>
> >> Maybe there is an other way to do that ? This is the only information
> >> that I really need from the font , the width of each char
> >>
> >> Thanks a lot for this library , I hope I can successfully integrate it
> >> into my project and hopefully contribute some code or fixes
> >>
> >> Damien
> >>
> >>
> >>
> >> Sent from my iPad
> >>
> >> On 2 May 2010, at 11:38, Dominik Seichter <[email protected]> wrote:
> >>> Hi,
> >>>
> >>> The relevant code, where PdfFontCID ist called with a NULL PdfEncoding
> >>> is only called, when you try to construct a PdfFont from an existing
> >>> object in a PDF file. Support for this is not very good. It works with
> >>> simple fonts, but PoDoFo is currently not able to consturct the
> >>> encoding for a CID font from a PDF file. So, PoDoFo should not crash in
> >>> this case, but maybe throw an exception that this is not supported.
> >>>
> >>> What do you want to do excactly? Maybe we can find another solution.
> >>>
> >>> Best regards,
> >>> Dominik
> >>>
> >>> Am Sonntag 02 Mai 2010 schrieb xteo:
> >>>> Hi ,
> >>>>
> >>>> I have recently started looking at podofo for one of my project that
> >>>> need PDF support .
> >>>>
> >>>> It look like a really great library !!
> >>>>
> >>>> to get started and make sure all was working ,
> >>>> I builded the library in my project and replicate the code from the
> >>>> code that extract the text from a PDF .
> >>>>
> >>>> version downloaded from the website : 0.8.0 compiled on Mac .
> >>>>
> >>>> on some PDF its working fine and I get what I expect but on some other
> >>>> it crash .
> >>>>
> >>>> I have looked into it and fond the cause but I am missing a little bit
> >>>> of context to try to fix it :
> >>>>
> >>>> int : PdfFontFactory.cpp
> >>>>
> >>>> PdfFont* PdfFontFactory::CreateFont( FT_Library* pLibrary, PdfObject*
> >>>> pObject ) {
> >>>> ......
> >>>>
> >>>> pFont = new PdfFontCID( pMetrics, NULL, pObject, false );
> >>>>
> >>>> }
> >>>>
> >>>> This create a PdfFontCID with a NULL pPdfEncoding.
> >>>>
> >>>> This later leads to issue in the constructor when void
> >>>> PdfFontCID::Init( bool bEmbed ) is called and m_pEncoding is NULL .
> >>>>
> >>>> // The encoding is here usually a (Predefined) CMap from
> >>>> PdfIdentityEncoding: m_pEncoding->AddToDictionary(
> >>>> m_pObject->GetDictionary() );
> >>>> ^^^^^^^^^^^ is NULL
> >>>>
> >>>> I am not sure what to make of the comment , I have try to pass various
> >>>> encoding to PdfFontCID , but didn't managed to fix the problem .
> >>>>
> >>>> Please let me know if there is anything ovious that I am missing .
> >>>>
> >>>> Damien
>
--
**********************************************************************
Dominik Seichter - [email protected]
KRename - http://www.krename.net - Powerful batch renamer for KDE
KBarcode - http://www.kbarcode.net - Barcode and label printing
PoDoFo - http://podofo.sf.net - PDF generation and parsing library
SchafKopf - http://schafkopf.berlios.de - Schafkopf, a card game, for KDE
Alan - http://alan.sf.net - A Turing Machine in Java
**********************************************************************
signature.asc
Description: This is a digitally signed message part.
------------------------------------------------------------------------------
_______________________________________________ Podofo-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/podofo-users
