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POGet PDF hyperlinks on iOS with Quartz
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  1. POGet PDF hyperlinks on iOS with Quartz
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    copied!<p>I've spent all day trying to get hyperlinks metadata from PDFs in my iPad application. The CGPDF* APIs are a true nightmare, and the only piece of information I've found on the net about all this is that I have to look for an "Annots" dictionary, but I just can't find it in my PDFs. </p> <p>I even used the old <a href="https://github.com/below/PDF-Voyeur/network" rel="nofollow noreferrer">Voyeur Xcode sample</a> to inspect my test PDF file, but no trace of this "Annots" dictionary...</p> <p>You know, this is a feature I see on every PDF reader - this same question has <a href="https://stackoverflow.com/questions/93297/newbie-wants-to-create-a-pdf-reader-for-ipod-touch-whats-the-best-approach">been</a> <a href="https://stackoverflow.com/questions/3257057/iphone-cgpdfdocument-pdf-links">asked</a> <a href="https://stackoverflow.com/questions/2609602/pdf-hyperlinks-on-iphone-ipad">multiple</a> <a href="https://stackoverflow.com/questions/1247792/how-to-access-hyperlinks-in-pdf-documents-iphone">times</a> here with no real practical answers. I usually never ask for sample code directly but apparently this time I really need it... anyone got this working, possibly with sample code?</p> <p><strong>Update</strong>: I just realized the guy who has done my testing PDF had just inserted an URL as text, and not a real annotation. He tried putting an annotation and my code works now... But that's not what I need, so it seems I'll have to analyze text and search for URLs. But that's another story... </p> <p><strong>Update 2</strong>: So I finally came up with some working code. I'm posting it here so hopefully it'll help someone. It assumes the PDF document actually contains annotations. </p> <pre><code>for(int i=0; i&lt;pageCount; i++) { CGPDFPageRef page = CGPDFDocumentGetPage(doc, i+1); CGPDFDictionaryRef pageDictionary = CGPDFPageGetDictionary(page); CGPDFArrayRef outputArray; if(!CGPDFDictionaryGetArray(pageDictionary, "Annots", &amp;outputArray)) { return; } int arrayCount = CGPDFArrayGetCount( outputArray ); if(!arrayCount) { continue; } for( int j = 0; j &lt; arrayCount; ++j ) { CGPDFObjectRef aDictObj; if(!CGPDFArrayGetObject(outputArray, j, &amp;aDictObj)) { return; } CGPDFDictionaryRef annotDict; if(!CGPDFObjectGetValue(aDictObj, kCGPDFObjectTypeDictionary, &amp;annotDict)) { return; } CGPDFDictionaryRef aDict; if(!CGPDFDictionaryGetDictionary(annotDict, "A", &amp;aDict)) { return; } CGPDFStringRef uriStringRef; if(!CGPDFDictionaryGetString(aDict, "URI", &amp;uriStringRef)) { return; } CGPDFArrayRef rectArray; if(!CGPDFDictionaryGetArray(annotDict, "Rect", &amp;rectArray)) { return; } int arrayCount = CGPDFArrayGetCount( rectArray ); CGPDFReal coords[4]; for( int k = 0; k &lt; arrayCount; ++k ) { CGPDFObjectRef rectObj; if(!CGPDFArrayGetObject(rectArray, k, &amp;rectObj)) { return; } CGPDFReal coord; if(!CGPDFObjectGetValue(rectObj, kCGPDFObjectTypeReal, &amp;coord)) { return; } coords[k] = coord; } char *uriString = (char *)CGPDFStringGetBytePtr(uriStringRef); NSString *uri = [NSString stringWithCString:uriString encoding:NSUTF8StringEncoding]; CGRect rect = CGRectMake(coords[0],coords[1],coords[2],coords[3]); CGPDFInteger pageRotate = 0; CGPDFDictionaryGetInteger( pageDictionary, "Rotate", &amp;pageRotate ); CGRect pageRect = CGRectIntegral( CGPDFPageGetBoxRect( page, kCGPDFMediaBox )); if( pageRotate == 90 || pageRotate == 270 ) { CGFloat temp = pageRect.size.width; pageRect.size.width = pageRect.size.height; pageRect.size.height = temp; } rect.size.width -= rect.origin.x; rect.size.height -= rect.origin.y; CGAffineTransform trans = CGAffineTransformIdentity; trans = CGAffineTransformTranslate(trans, 0, pageRect.size.height); trans = CGAffineTransformScale(trans, 1.0, -1.0); rect = CGRectApplyAffineTransform(rect, trans); // do whatever you need with the coordinates. // e.g. you could create a button and put it on top of your page // and use it to open the URL with UIApplication's openURL } } </code></pre>
 

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