Create a table of contents from a pdf file

Question

I\'m using quartz to display pdf content, and I need to create a table of contents to navigate through the pdf. From reading Apple\'s documentation I think I am supposed to

Answer 1

Something like this might help you get started:

NSURL *documentURL = ...; // URL to file or http resource etc.
CGPDFDocumentRef pdfDocument = CGPDFDocumentCreateWithURL((CFURLRef)documentURL);
CGPDFDictionaryRef pdfDocDictionary = CGPDFDocumentGetCatalog(pdfDocument);
// loop through dictionary...
CGPDFDictionaryApplyFunction(pdfDocDictionary, ListDictionaryObjects, NULL);
CGPDFDocumentRelease(pdfDocument);

...

void ListDictionaryObjects (const char *key, CGPDFObjectRef object, void *info) {
    NSLog("key: %s", key);
    CGPDFObjectType type = CGPDFObjectGetType(object);
    switch (type) { 
        case kCGPDFObjectTypeDictionary: {
            CGPDFDictionaryRef objectDictionary;
            if (CGPDFObjectGetValue(object, kCGPDFObjectTypeDictionary, &objectDictionary)) {
                CGPDFDictionaryApplyFunction(objectDictionary, ListDictionaryObjects, NULL);
            }
        }
        case kCGPDFObjectTypeInteger: {
            CGPDFInteger objectInteger;
            if (CGPDFObjectGetValue(object, kCGPDFObjectTypeInteger, &objectInteger)) {
                NSLog("pdf integer value: %ld", (long int)objectInteger); 
            }
        }
        // test other object type cases here
        // cf. http://developer.apple.com/mac/library/documentation/GraphicsImaging/Reference/CGPDFObject/Reference/reference.html#//apple_ref/doc/uid/TP30001117-CH3g-SW1
    }    
}

Answer 2

You create a Table of Contents (AKA Outlines, Bookmarks) using PDFKit's PDFOutline object. You can also read existing Outlines within a PDF.

CGPDFDocumentGetCatalog is a method for getting the Catalog of PDF data in the file, which is at a much lower-level than human concepts of 'Contents'.

In the absence of existing Outlines, I'm not sure there's a way to get meaningful data from the PDF stream itself, e.g. trying to grok Chapter headings just from the PDF data.

Answer 3

Here is my approach.
1. Download this framework vfr reader
2. Use this lines of code to get all PDF chapters

NSString *path = [[NSBundle mainBundle] pathForResource:@"Reader" ofType:@"pdf"];
NSURL *targetURL = [NSURL fileURLWithPath:path];
NSArray *arr = [ReaderDocumentOutline outlineFromFileURL:targetURL password:@""];

Hope it will help you.

Answer 4

I did it with a freeware library for iOS FastPdfKit