填写 PyPDF2 的 pdf 表单不显示在打印中

Question

我需要批量填写 pdf 表单，因此尝试编写 python 代码从 csv 文件中帮我完成。我在此 question 中使用了第二个答案，它可以很好地填写表格，但是当我打开填写的表格时，除非选择相应的字段，否则答案不会显示。打印表格时也不会显示答案。我查看了 PyPDF2 文档，看是否可以展平生成的表单，但此功能尚未实现，尽管大约一年前就已提出要求。我的偏好是不使用 pdftk，这样我就可以在不需要更多依赖的情况下编译脚本。在上述问题中使用原始代码时，打印中显示了一些字段，而有些则没有，这让我对它们的工作方式感到困惑。感谢任何帮助。

这是代码。

# -*- coding: utf-8 -*-

from collections import OrderedDict
from PyPDF2 import PdfFileWriter, PdfFileReader


def _getFields(obj, tree=None, retval=None, fileobj=None):
    """
    Extracts field data if this PDF contains interactive form fields.
    The *tree* and *retval* parameters are for recursive use.

    :param fileobj: A file object (usually a text file) to write
    a report to on all interactive form fields found.
    :return: A dictionary where each key is a field name, and each
    value is a :class:`Field<PyPDF2.generic.Field>` object. By
    default, the mapping name is used for keys.
    :rtype: dict, or ``None`` if form data could not be located.
    """
    fieldAttributes = {'/FT': 'Field Type', '/Parent': 'Parent', '/T': 'Field Name', '/TU': 'Alternate Field Name',
                   '/TM': 'Mapping Name', '/Ff': 'Field Flags', '/V': 'Value', '/DV': 'Default Value'}
    if retval is None:
        retval = {} #OrderedDict()
        catalog = obj.trailer["/Root"]
        # get the AcroForm tree
        if "/AcroForm" in catalog:
            tree = catalog["/AcroForm"]
        else:
            return None
    if tree is None:
        return retval

    obj._checkKids(tree, retval, fileobj)
    for attr in fieldAttributes:
        if attr in tree:
            # Tree is a field
            obj._buildField(tree, retval, fileobj, fieldAttributes)
            break

    if "/Fields" in tree:
        fields = tree["/Fields"]
        for f in fields:
            field = f.getObject()
            obj._buildField(field, retval, fileobj, fieldAttributes)

    return retval


def get_form_fields(infile):
    infile = PdfFileReader(open(infile, 'rb'))
    fields = _getFields(infile)
    return {k: v.get('/V', '') for k, v in fields.items()}


def update_form_values(infile, outfile, newvals=None):
    pdf = PdfFileReader(open(infile, 'rb'))
    writer = PdfFileWriter()

    for i in range(pdf.getNumPages()):
        page = pdf.getPage(i)
        try:
            if newvals:
                writer.updatePageFormFieldValues(page, newvals)
            else:
                writer.updatePageFormFieldValues(page,
                                             {k: f'#{i} {k}={v}'
                                              for i, (k, v) in 
enumerate(get_form_fields(infile).items())
                                              })
            writer.addPage(page)
        except Exception as e:
            print(repr(e))
            writer.addPage(page)

    with open(outfile, 'wb') as out:
        writer.write(out)


if __name__ == '__main__':
    import csv    
    import os
    from glob import glob
    cwd=os.getcwd()
    outdir=os.path.join(cwd,'output')
    csv_file_name=os.path.join(cwd,'formData.csv')
    pdf_file_name=glob(os.path.join(cwd,'*.pdf'))[0]
    if not pdf_file_name:
        print('No pdf file found')
    if not os.path.isdir(outdir):
        os.mkdir(outdir)
    if not os.path.isfile(csv_file_name):
        fields=get_form_fields(pdf_file_name)
        with open(csv_file_name,'w',newline='') as csv_file:
            csvwriter=csv.writer(csv_file,delimiter=',')
            csvwriter.writerow(['user label'])
            csvwriter.writerow(['fields']+list(fields.keys()))
            csvwriter.writerow(['Mr. X']+list(fields.values()))
    else:
        with open(csv_file_name,'r',newline='') as csv_file:
            csvreader=csv.reader(csv_file,delimiter=',')
            csvdata=list(csvreader)
        fields=csvdata[1][1:]
        for frmi in csvdata[2:]:
            frmdict=dict(zip(fields,frmi[1:]))
            outfile=os.path.join(outdir,frmi[0]+'.pdf')
            update_form_values(pdf_file_name, outfile,frmdict)

Answer 1

我遇到了同样的问题，显然将“/NeedsAppearance”属性添加到 AcroForm 的 PdfWriter 对象解决了问题（参见 https://github.com/mstamy2/PyPDF2/issues/355). With much help from ademidun (https://github.com/ademidun），我能够填充 pdf 表单并获得值的字段显示正确。下面是一个例子：

from PyPDF2 import PdfFileReader, PdfFileWriter
from PyPDF2.generic import BooleanObject, NameObject, IndirectObject


def set_need_appearances_writer(writer):
    # See 12.7.2 and 7.7.2 for more information:
    # http://www.adobe.com/content/dam/acom/en/devnet/acrobat/
    #     pdfs/PDF32000_2008.pdf
    try:
        catalog = writer._root_object
        # get the AcroForm tree and add "/NeedAppearances attribute
        if "/AcroForm" not in catalog:
            writer._root_object.update(
                {
                    NameObject("/AcroForm"): IndirectObject(
                        len(writer._objects), 0, writer
                    )
                }
            )

        need_appearances = NameObject("/NeedAppearances")
        writer._root_object["/AcroForm"][need_appearances] = BooleanObject(True)
        return writer

    except Exception as e:
        print("set_need_appearances_writer() catch : ", repr(e))
        return writer


reader = PdfFileReader("myInputPdf.pdf", strict=False)
if "/AcroForm" in reader.trailer["/Root"]:
    reader.trailer["/Root"]["/AcroForm"].update(
        {NameObject("/NeedAppearances"): BooleanObject(True)}
    )

writer = PdfFileWriter()
set_need_appearances_writer(writer)
if "/AcroForm" in writer._root_object:
    writer._root_object["/AcroForm"].update(
        {NameObject("/NeedAppearances"): BooleanObject(True)}
    )

field_dictionary = {"Field1": "Value1", "Field2": "Value2"}

writer.addPage(reader.getPage(0))
writer.updatePageFormFieldValues(writer.getPage(0), field_dictionary)

with open("myOutputPdf.pdf", "wb") as fp:
    writer.write(fp)

Answer 2

这对我来说适用于 Python 3.8 和 PyPDF4（但我认为它也适用于 PyPDF2）：

#!/usr/bin/env python3
from PyPDF4.generic import NameObject
from PyPDF4.generic import TextStringObject
from PyPDF4.pdf import PdfFileReader
from PyPDF4.pdf import PdfFileWriter

import random
import sys

reader = PdfFileReader(sys.argv[1])

writer = PdfFileWriter()
# Try to "clone" the original one (note the library has cloneDocumentFromReader)
# but the render pdf is blank
writer.appendPagesFromReader(reader)
writer._info = reader.trailer["/Info"]
reader_trailer = reader.trailer["/Root"]
writer._root_object.update(
    {
        key: reader_trailer[key]
        for key in reader_trailer
        if key in ("/AcroForm", "/Lang", "/MarkInfo")
    }
)

page = writer.getPage(0)

params = {"Foo": "Bar"}

# Inspired by updatePageFormFieldValues but also handle checkboxes
for annot in page["/Annots"]:
    writer_annot = annot.getObject()
    field = writer_annot["/T"]
    if writer_annot["/FT"] == "/Btn":
        value = params.get(field, random.getrandbits(1))
        if value:
            writer_annot.update(
                {
                    NameObject("/AS"): NameObject("/On"),
                    NameObject("/V"): NameObject("/On"),
                }
            )
    elif writer_annot["/FT"] == "/Tx":
        value = params.get(field, field)
        writer_annot.update(
            {
                NameObject("/V"): TextStringObject(value),
            }
        )

with open(sys.argv[2], "wb") as f:
    writer.write(f)

这会更新文本字段和复选框。

我认为关键部分是从原始文件中复制了一些部分：

reader_trailer = reader.trailer["/Root"]
writer._root_object.update(
    {
        key: reader_trailer[key]
        for key in reader_trailer
        if key in ("/AcroForm", "/Lang", "/MarkInfo")
    }
)

注意：欢迎大家把这个解决方案分享到其他地方，我参考了很多与这个主题相关的SO问题。

填写 PyPDF2 的 pdf 表单不显示在打印中

pdf form filled with PyPDF2 does not show in print

python-3.x

pdf-form

pypdf2