通过acrokey查找字段绝对位置和尺寸 [英] Find field absolute position and dimension by acrokey

问题描述

鉴于一个acrokey，是否有可能找到该特定字段的绝对位置和维度（getLeft，getTop，getWidth，getHeight）？

Given an acrokey, is it possible to find the absolute position and dimension of that particular field (getLeft, getTop, getWidth, getHeight) ?

反之亦然可能 - 如果我知道这个位置，我可以获得该字段的大小吗？

And is the viceversa possible - if I know the position, can I get the acrokey of the field?

推荐答案

你问题的第一部分：

假设您有一个 AcroFields 实例（表单），从 PdfReader （只读）或 PdfStamper 实例中检索，然后就可以了获取与特定字段 name 对应的第一个窗口小部件的字段位置，如下所示：

Suppose that you have an AcroFields instance (form), either retrieved from a PdfReader (read only) or a PdfStamper instance, then you can get the field position of the first widget that corresponds with a specific field name like this:

Rectangle rectangle = form.getFieldPositions(name).get(0).position;

请注意，一个字段可以与多个小部件对应。例如，要获取第二个小部件，您需要：

Note that one field can correspond with multiple widgets. For instance, to get the second widget, you need:

Rectangle rectangle = form.getFieldPositions(name).get(1).position;

当然：您可能还想知道页码：

Of course: you probably also want to know the page number:

int page = form.getFieldPositions(name).get(0).page;

问题的第二部分

字段对应于窗口小部件注释。如果您知道窗口小部件注释的页码，则可以获取页面字典并检查 / Annots 数组的条目。您必须遍历不同的注释，检查每个注释的 / Rect 条目。找到匹配项后，您需要抓取与注释对应的字段的内容。这比在本网站的代码示例中提供的工作更多。

Fields correspond with widget annotations. If you know the page number of the widget annotation, you could get the page dictionary and inspect the entries of the /Annots array. You'll have to loop over the different annotations, inspecting each annotation's /Rect entry. Once you find a match, you need to crawl the content for the field that corresponds with the annotation. That's more work than can be provided in a code sample on this site.

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