我需要批量填写pdf表单，所以我试着编写一个python代码来从csv文件中为我做这个。我在这个question中使用了第二个答案，它填写表格很好，但是当我打开填充的表格时，除非选择相应的字段，否则答案不会显示。表格打印时也没有显示答案。我查看了PyPDF2文档，看看我是否可以压缩生成的表单但是这个功能还没有实现，即使大约一年前已经被要求了。我的偏好是不使用pdftk所以我可以编译脚本而不需要更多的依赖。在上述问题中使用原始代码时，某些字段会显示在打印件中，而某些字段并不会使我对他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)
答案 0 :(得分：8)
我有同样的问题，并且显然添加了＆＃34; / NeedsAppearance＆＃34;属性到AcroForm的PdfWriter对象修复了问题（参见https://github.com/mstamy2/PyPDF2/issues/355）。在ademidun（https://github.com/ademidun）的帮助下，我能够填充pdf表单并正确显示字段的值。以下是一个例子：
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()
答案 1 :(得分：-1)
这对我来说适用于 Python 3.8 和 PyPDF4（但我认为它适用于 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。
我相信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：请随时在其他地方分享此解决方案，我咨询了很多与此主题相关的 SO 问题。