CGPDFDictionary键 | CGPDFDictionary

本文介绍了CGPDFDictionary键的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我变得疯狂，因为我无法找到PDF文档中的默认键。

I'm getting crazy, cause I cannot find what are the "default" keys you would have in a PDF Document.

例如，如果我想要从CGPDFDocument中检索超链接，我这样做：

For example, if I want to retrieve an hyperlink from a CGPDFDocument, I do this:

CGPDFStringRef uriStringRef;
if(!CGPDFDictionaryGetString(aDict, "URI", &uriStringRef)) {
    break;
}

在这种情况下，键是URI。有没有一个文件解释CGPDFDictionary的键是什么？

In this case, the key is "URI". Is there a document explaining what are the keys of a CGPDFDictionary?

推荐答案

你需要阅读1300页长是荒谬的specs只是为了找到字典包含的键，一个可以包含任何内容的字典，具体取决于它是什么类型的注释。

It's absurd that you would have to go read 1300 page long specs just to find what keys a dictionary contains, a dictionary that could contain anything depending on what kind of annotation it is.

获取<$中的键列表c $ c> CGPDFDictionaryRef 你这样做：

// temporary C function to print out keys
void printPDFKeys(const char *key, CGPDFObjectRef ob, void *info) { 
    NSLog(@"key = %s", key);
}

在您试图查看内容的地方：

In the place where you're trying to see the contents:

CGPDFDictionaryRef mysteriousDictionary; // this is your dictionary with keys
CGPDFDictionaryApplyFunction(mysteriousDictionary, printPDFKeys, NULL);
// break on or right after above, and you will have the list of keys NSLogged

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