How to access hyperlinks in PDF documents (iPhone)?

Question

Is it possible to get access to "internal" links in PDF documents using CGPDFDocument, or other means? I'm building a simple reader app and would like to deliver my content in PDF form, but if I can't support links between pages in the doc this probably isn't going to work.

This question is similar, but does not address the issue of how to support hyperlinks.

Answer 1

If you're using Quartz to open and view a PDF, then yes, it looks like you will have access to internal links. Quartz will also let you add new links to PDFs. I don't have any first hand experience with iPhone/Mac development, but it would be quite strange for them to let you add hyperlinks, but not use them.

Answer 2

bump

This is the only thing holding me back at the moment. Did you figure it out Kaffeine Coma?

Answer 3

how it is acceptable...how is it working to a hyperlinked document from PDF in iphone? Please give details with sample code......other wise dont show this blog

Answer 4

See my answer here. Basically, you'll need to get familiar with PDF link annotations.

Answer 5

You need to do in two steps.

First: Parse your pdf to locate marked content operators

That's an exemple of a parsing code :

-(void)parseContent() {
    CGPDFOperatorTableRef myTable;
    myTable = CGPDFOperatorTableCreate();
    CGPDFOperatorTableSetCallback(myTable, "BMC", &myOperator_BMC);
    CGPDFContentStreamRef myContentStream = CGPDFContentStreamCreateWithPage(page);
    CGPDFScannerRef myScanner = CGPDFScannerCreate(myContentStream, myTable, autoZoomAreas);
    CGPDFScannerScan(myScanner);
    CGPDFScannerRelease(myScanner);
    CGPDFContentStreamRelease(myContentStream); 
}

void myOperator_BMC(CGPDFScannerRef s, void *info)
{
    const char *name;
    CGPDFScannerPopName(s, &name);
}

(You need to complete and adjust this code to match your requirement)

Second: respond to the toucheEnded message to handle tap on those zones and make the UI respond accordingly.

Answer 6

Hi YdesmedT Will u please elaborate how touchEnded can be implemented? And about zone what you are talking about?

Answer 7

Ya , i got some ideas about zooming , but after tapping how to get the link address to load request,

CGPDFScannerPopName(s, &name); after this instruction , what exactly i mean , how to handle?

Parsing function enters this loop and displays WebCapture if i print that name. void myOperator_BMC(CGPDFScannerRef s, void *info) { const char *name; CGPDFScannerPopName(s, &name); }

How to get the exact link? Can u give me touchEnded code? if u can write code snippet. Thanq :)

Answer 8

May i know , what is autoZoomAreas in above code?