I found out that

PdfAction::HasURI() is checking if a key "URI" exists in the dictionary, 
PdfAction::GetURI() is to get the related URI. Unfortunately, GetURI() is only 
calling

    return this->GetObject()->GetDictionary().GetKey( "URI" )->GetString();

but there are also PDF documents that store the URI as a reference to a string. 
Wouldn't it be good to have a possibility to get these ones also? Then, 
GetURI() has to be changed to something like

PdfAction::GetURI(PdfDocument* document=NULL)

to get access to all objects if necessary and to stay compatible with the 
current implementation.


Hardy

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