Thanks for the tips, but are you even able to provide an example of what goes
into this Parameter (PdfDecodeParms) in the PdfFilter->Decode function ? I
just cannot get it to work.
It's supposed to be a Dictionary pointer of which I pass the address. I'm not
sure I'm even supposed to extract the sub Dictionary from an Xref stream?
What I am trying to do is this: I want to use the PdfFilter->Decode function
to decode a stream using PdfDecodeParms. That's it.
Any help would be sincerely appreciated.
> From: z...@litepdf.cz
> To: podofo-users@lists.sourceforge.net
> Date: Tue, 19 Aug 2014 09:02:51 +0200
> Subject: Re: [Podofo-users] DecodeParms, how to use?
>
> On Tue, 2014-08-19 at 13:17 +0930, Domonic Tom wrote:
> > ...
> >
> > <</DecodeParms<</Columns 4/Predictor
> > 12>>/Filter/FlateDecode/ID[<6647557224A6C102A60F6D82BB22C18D><AA383B5CF85B7F4BACB9D502B93343E9>]/Index[10
> >
> > 20]/Info 9 0 R/Length 64/Prev 23381/Root 11 0 R/Size
> > 30/Type/XRef/W[1 2 1]>>
> >
> > If I know which object this is and extract the dictionary then I
> > can't see why it won't work.
>
> Hi,
> I do not think I can help you much here, also because I'm unsure what
> you are trying to do, but maybe this will help a little bit:
>
> Once you have a PdfDictionary, you can get its keys (and values) by:
> if (dict->HasKey("Columns"))
> columns = dict->GetKey("Columns");
>
> See the base/PdfDictionary.h for more GetKey...() variants.
>
> If yours 'dict' points to:
> <</DecodeParms<</Columns 4/Predictor 12>>...>>
> then the way to get into the inner/sub-dictionary might be:
> columns = dict->GetKey("DecodeParams")->GetDictionary().GetKey("Columns");
> Some safety checks like HasKey() and IsDictionary() will make your
> code more error proof.
>
> > PdfDictionary *dict = new PdfDictionary;
> > *dict = obj->GetDictionary();
> >
>
> The above construction is incorrect by many means. It might be done
> either directly, like in the snippets I wrote above (not assigning to a
> variable) or by:
> const PdfDictionary &dict = obj->GetDictionary();
> if (dict.HasKey(...)) ...
>
> Hope it helps,
> zyx
>
>
> --
> http://www.litePDF.cz i...@litepdf.cz
>
>
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