You need to read ISO 32000 (the PDF standard) more – or try a book such as my
“Developing with PDF” (<http://thepdfbook.com/>) to better under the various
data structures in a PDF, how they go together and then finally combine to make
an appearance stream for an annotation.
Leonard
From: VED PRAKASH <veda...@gmail.com<mailto:veda...@gmail.com>>
Date: Wednesday, June 11, 2014 at 8:11 AM
To:
"podofo-users@lists.sourceforge.net<mailto:podofo-users@lists.sourceforge.net>"
<podofo-users@lists.sourceforge.net<mailto:podofo-users@lists.sourceforge.net>>
Subject: [Podofo-users] How to add Appearance Steam (AP) annotations
Hi,
I have used your library to add FreeText annotations, the problem with the
annotations is it doesn't appear in any preview tool, includes Google, Adobe
Reader, FoxIT etc.
I tried to edit an added annotation through Mac inbuilt Preview tool, which
added an AP tag in the stream. I compared both the pdf by opening them in
TextEditor, I found the difference of AP tag, as per Adobe PDF reference, I
found it is necessary to add AP tag if you want to make annotation visible.
Now, I was wondering how can I add an AP tag through podofo, I have found
only single resource and put that in my code..
PoDoFo::PdfXObject xObj(rect,doc,NULL);
PoDoFo::PdfDictionary& annotationDic = anno->GetObject()->GetDictionary();
annotationDic.AddKey(PoDoFo::PdfName("N"),
PoDoFo::PdfObject(PoDoFo::PdfString([content UTF8String])));
xObj.AddColorResource(PoDoFo::PdfColor( 0.0,0.0,0.0));
xObj.AddResource(PoDoFo::PdfName("/Helv 12 Tf 0 g"),
xObj.GetObject()->Reference(),PoDoFo::PdfName("Font"));
anno->SetAppearanceStream(&xObj);
The above code doesn't seem to work, and too the value "/Helv 12 Tf 0 g"
appears encoded like "/#2FHelv#2012#20Tf#200#20g" this is looking incorrect for
me.
I have found few more problems, like there are some special or unwanted
characters added with FreeText annotation foreg. Contents(þÿMY ANNOTATION)..
Please help me to achieve this.
Thank you.
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