无法更改/注释内容 [英] Can't change /Contents of annotation

问题描述

我正在尝试使用iTextSharp更改某些PDF注释中的文本。这是我的代码：

I'm trying to change the text in some PDF annotations using iTextSharp. Here is my code:

    void changeAnnotations(string inputPath, string outputPath)
    {
        PdfReader pdfReader = new PdfReader(inputPath);
        PdfStamper pdfStamper = new PdfStamper(pdfReader, new FileStream(outputPath, FileMode.Create));

        //get the PdfDictionary of the 1st page
        PdfDictionary pageDict = pdfReader.GetPageN(1);

        //get annotation array
        PdfArray annotArray = pageDict.GetAsArray(PdfName.ANNOTS);

        //iterate through annotation array
        int size = annotArray.Size;
        for (int i = 0; i < size; i++)
        {

            //get value of /Contents
            PdfDictionary dict = annotArray.GetAsDict(i);
            PdfString contents = dict.GetAsString(PdfName.CONTENTS);

            //check if /Contents key exists
            if (contents != null)
            {

                //set new value
                dict.Put(PdfName.CONTENTS, new PdfString("value has been changed"));
            }
        }
        pdfStamper.Close();
    }

当我在Adobe Reader中打开输出文件时，没有任何文字发生变化在任何注释中。我应该如何在注释中设置新值？

When I open the output file in Adobe Reader, none of the text has changed in any of the annotations. How should I be setting the new value in an annotation?

更新：我发现当我点击时出现的弹出框中正在更改该值注解。在某些情况下，当我在弹出框中修改此值时，更改将应用​​于注释。

UPDATE: I've found that the value is being changed in the popup box that appears when I click on the annotation. And in some cases, when I modify this value in the popup box, the change is then applied to the annotation.

推荐答案

As OP在评论中澄清：

As the OP clarified in a comment:

这个注释是 FreeText ，怎么做我找到并更改了此文本框中显示的文本？

This annotation is a FreeText, how do I find and change the text that's displayed in this text box?

自由文本注释允许使用多种机制来设置显示的文本：

Free text annotations allow a number of mechanisms to set the displayed text:

• 预先格式化的外观流，由 AP N 条目引用>词典


• 富文本字符串，默认样式字符串分别在 RC 和 DS 中给出


• 应用于 DA 和内容中给出的内容的默认外观字符串

• A pre-formatted appearance stream, referenced by the N entry in the AP dictionary
• A rich text string with a default style string given in RC and DS respectively
• A default appearance string applied to the contents given in DA and Contents respectively

（有关详细信息，参见PDF规范 ISO 32000-1 部分12.5.6.6 自由文本注释）

(For details cf. the PDF specification ISO 32000-1 section 12.5.6.6 Free Text Annotations)

如果要使用其中一种机制更改文本，请确保删除或调整其他机制的条目内容;否则您的更改可能在一些观看者身上不可见或甚至不可见，但在其他观看者身上不可见。

我无法想象如何确定是否有外观流。那是 / AP 属性吗？我检查了其中一个注释，它是一个带有单个条目的字典，其值为 28 0 R 。

I can't figure out how to determine if there is an appearance stream. Is that the /AP property? I checked that for one of the annotations and it's a dictionary with a single entry whose value is 28 0 R.

因此其中一个注释确实附带了一个外观流。 单个条目的值 28 0 R 可能有 N 名称来表示正常外观。 28 0 R 是对对象编号 28 且生成 0 <的间接对象的引用/ code>。

So that one of the annotations indeed comes with an appearance stream. The single entry whose value is 28 0 R presumably has the N name to indicate the normal appearance. 28 0 R is a reference to the indirect object with object number 28 and generation 0.

如果要更改文本内容但不想处理格式详细信息，则应删除 AP 进入。

If you want to change the text content but do not want to deal with the formatting details, you should remove the AP entry.

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