我正在寻找一种方法,在PDF中添加一个注解,仅使用普通的C/C+++(没有第三方图书馆)。
我怎样才能得到这个结果?
这里是""http://partners.adobe.com/public/ developmenter/en/pdf/PDFReference.pdf" rel="无随从的无参考">PDF参考文件第三版 。
PDF files are composed by different binary objects, that can be compressed, encoded or encrypted using different algorithms, compression schemes (lossy and lossless) and encoding filters. Each object is referenced in a reference table with information on its position in the file. You will need to know how to deal with this table, you will need to implement all possible compression schemes, encodings filters and encryption algorithms, and then you will have to deal with all possible structures of PDF objects.
在 PDF 规格中,这些对象被称为词典,它们由条目组成。每个条目都有一种类型,可以是简单类型,也可以是另一种词典(或引用它),或者是另外一种元素类型的阵列。因此我们可以说,PDF基本上是字典对象的树。
一旦您的代码能够处理规格中可能的所有字典和树结构,您就可以进入第8章-该规格的交互式特征 , Part 8.4 - 说明 ,并在PDF文件中添加注释词典。
您应该注意到, 我甚至没有提到 PDF 文件的热题, 如字体、 颜色空格、 换行空间、 以及在页面中绘制指令 。 我正在计算您能够将所有对象装入文件, 创建一个批注对象, 以某种方式将其插入到您的对象树上, 并再次保存所有对象 。 这或多或少是 < a href=> http:// itextpdf. com/" rel=" nofollow noreferr" > iText < / a > 如何工作, 所以如果您真的想要执行这个, 您可以查看 iText 的源代码, 这样您就可以拥有一个小窗口, 来显示这类工程所需要的工作量 。
您也可以查看 < a href=> https://stackoverflow.com/a/ 3610696/501196> 的SO 中的答案 。
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