python-3.x - 用 PyPDF2 填充的 pdf 表单不显示在打印中

Question

我需要批量填写pdf表单，所以尝试编写一个python代码来从csv文件中为我完成。我在这个 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，除非选择了相应的字段，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，看看我是否可以展平生成的表单，但即使大约一年前就有人要求此功能，但尚未实现。我的偏好是不使用 pdftk，因此我可以编译脚本而无需更多依赖。在提到的问题中使用原始代码时，有些字段会显示在打印中，有些则不会，这让我对它们的工作方式感到困惑。任何帮助表示赞赏。

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 对象解决了这个问题(见 https://github.com/mstamy2/PyPDF2/issues/355)。在 ademidun ( https://github.com/ademidun ) 的大力帮助下，我能够填充 pdf 表单并正确显示字段的值。下面是一个例子:

from PyPDF2 import PdfFileWriter, PdfFileReader
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

infile = "myInputPdf.pdf"
outfile = "myOutputPdf.pdf"

inputStream = open(infile, "rb")
pdf_reader = PdfFileReader(inputStream, strict=False)
if "/AcroForm" in pdf_reader.trailer["/Root"]:
    pdf_reader.trailer["/Root"]["/AcroForm"].update(
        {NameObject("/NeedAppearances"): BooleanObject(True)})

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

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

pdf_writer.addPage(pdf_reader.getPage(0))
pdf_writer.updatePageFormFieldValues(pdf_writer.getPage(0), field_dictionary)

outputStream = open(outfile, "wb")
pdf_writer.write(outputStream)

inputStream.close()
outputStream.close()