ItextSharp - Acrofields是空的 [英] ItextSharp - Acrofields are empty

问题描述

我有一个填写完整字段的PDF表单。如果我尝试阅读acrofields它们是空的。但在PDF中我可以更改值并保存它们。

I have a PDF form with filled out fields. If I try to read the acrofields they are empty. But in the PDF I can change the values and save them.

private static string GetFormFieldNamesWithValues(PdfReader pdfReader)
{
    return string.Join("\r\n", pdfReader.AcroFields.Fields
                                   .Select(x => x.Key + "=" +
                                    pdfReader.AcroFields.GetField(x.Key))
                                   .ToArray());
}

var reader = new PdfReader((DataContext as PDFContext).Datei);
AcroFields form = reader.AcroFields;
txt.Text = GetFormFieldNamesWithValues(reader);

如何阅读字段？

推荐答案

显然您的PDF已损坏。这些字段在页面级别定义为小部件注释，但在文档中设置的 / AcroForm 字段中未引用它们根级别。

Clearly your PDF is broken. The fields are defined as widget annotations on the page level, but they aren't referenced in the /AcroForm fields set on the document root level.

您可以使用 FixBrokenForm 代码示例：

PdfReader reader = new PdfReader(src);
PdfDictionary root = reader.getCatalog();
PdfDictionary form = root.getAsDict(PdfName.ACROFORM);
PdfArray fields = form.getAsArray(PdfName.FIELDS);

PdfDictionary page;
PdfArray annots;
for (int i = 1; i <= reader.getNumberOfPages(); i++) {
    page = reader.getPageN(i);
    annots = page.getAsArray(PdfName.ANNOTS);
    for (int j = 0; j < annots.size(); j++) {
        fields.add(annots.getAsIndirectObject(j));
    }
}
PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(dest));
stamper.close();
reader.close();

您应该告知创建者用于生成表格的工具，他们的PDF不是符合PDF参考。

You should inform the creators of the tool that was used to produce the form that their PDFs aren't compliant with the PDF reference.

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