表单字段的Python Django PDF展平

时间:2019-03-15 17:12:18

标签: python django pdf pypdf2 pdfrw

我有一个项目,我需要填写预制的PDF,而要实现这一目标,我想到的最合乎逻辑的解决方案是将预制的PDF制成PDF表单,因此应该有一些标签,其中的输入值应该然后,我可以浏览PDF中的表单标签,并将它们与值字典对齐。

我已经使用 PyPDF2 完成了此任务。总体而言,我拍摄了一个Web表单的图像,然后打开Acrobat并根据图像中看到的字段创建了一个PDF表单,然后使用 PyPDF2 填写了PDF表单字段,但需要注意的是在某些浏览器中(那些就是Firefox)打印那些填充值似乎是错误的。

我如何将我的PDF表单转换为标准/平面PDF,这样我可以保留预先填充的值,但是却丢失了可编辑字段(因为我认为这是问题所在)?

from io import BytesIO

import PyPDF2
from django.http import HttpResponse

from PyPDF2.generic import BooleanObject, NameObject, IndirectObject


def pdf_view(request):
    template = 'templates/template.pdf'

    outfile = "templates/test.pdf"

    input_stream = open(template, "rb")
    pdf_reader = PyPDF2.PdfFileReader(input_stream, strict=False)
    if "/AcroForm" in pdf_reader.trailer["/Root"]:
        pdf_reader.trailer["/Root"]["/AcroForm"].update(
            {NameObject("/NeedAppearances"): BooleanObject(True)})

    pdf_writer = PyPDF2.PdfFileWriter()
    set_need_appearances_writer(pdf_writer)
    if "/AcroForm" in pdf_writer._root_object:
        # Acro form is form field, set needs appearances to fix printing issues
        pdf_writer._root_object["/AcroForm"].update(
            {NameObject("/NeedAppearances"): BooleanObject(True)})

    data_dict = {
        'first_name': 'John',
        'last_name': 'Smith',
        'email': 'mail@mail.com',
        'phone': '889-998-9967',
        'company': 'Amazing Inc.',
        'job_title': 'Dev',
        'street': '123 Main Way',
        'city': 'Johannesburg',
        'state': 'New Mexico',
        'zip': 96705,
        'country': 'USA',
        'topic': 'Who cares...'

    }

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

    output_stream = BytesIO()
    pdf_writer.write(output_stream)

    # print(fill_in_pdf(template, data_dict).getvalue())

    # fill_in_pdf(template, data_dict).getvalue()
    response = HttpResponse(output_stream.getvalue(), content_type='application/pdf')
    response['Content-Disposition'] = 'inline; filename="completed.pdf"'
    input_stream.close()

    return response


def set_need_appearances_writer(writer):
    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)


    except Exception as e:
        print('set_need_appearances_writer() catch : ', repr(e))

    return writer

1 个答案:

答案 0 :(得分:2)

解决方案非常简单,如有疑问,请阅读文档(第552/978页):

https://www.adobe.com/content/dam/acom/en/devnet/pdf/pdfs/pdf_reference_archives/PDFReference.pdf

我要做的就是将字段标志的位位置更改为1,使字段变为ReadOnly,如下所示:

else: