Python:PDF:如何从带有单选按钮的表单中读取

时间:2019-04-23 13:37:18

标签: python pdf reportlab

按照Creating Interactive PDF Forms in ReportLab with Python

的示例,我创建了带有一些单选按钮的表单。

这是代码示例esp。用于收音机:

simple_radios.py

from reportlab.pdfgen import canvas
from reportlab.pdfbase import pdfform
from reportlab.lib.colors import magenta, pink, blue, green

def create_simple_radios():
    c = canvas.Canvas('simple_radios.pdf')

    c.setFont("Courier", 20)
    c.drawCentredString(300, 700, 'Radio demo')
    c.setFont("Courier", 14)
    form = c.acroForm

    c.drawString(10, 650, 'Dog:')
    form.radio(name='radio1', tooltip='Field radio1',
               value='value1', selected=False,
               x=110, y=645, buttonStyle='check',
               borderStyle='solid', shape='square',
               borderColor=magenta, fillColor=pink, 
               textColor=blue, forceBorder=True)
    form.radio(name='radio1', tooltip='Field radio1',
               value='value2', selected=True,
               x=110, y=645, buttonStyle='check',
               borderStyle='solid', shape='square',
               borderColor=magenta, fillColor=pink, 
               textColor=blue, forceBorder=True)    

    c.drawString(10, 600, 'Cat:')
    form.radio(name='radio2', tooltip='Field radio2',
               value='value1', selected=True,
               x=110, y=595, buttonStyle='cross',
               borderStyle='solid', shape='circle',
               borderColor=green, fillColor=blue, 
               borderWidth=2,
               textColor=pink, forceBorder=True)
    form.radio(name='radio2', tooltip='Field radio2',
               value='value2', selected=False,
               x=110, y=595, buttonStyle='cross',
               borderStyle='solid', shape='circle',
               borderColor=green, fillColor=blue, 
               borderWidth=2,
               textColor=pink, forceBorder=True)

    c.drawString(10, 550, 'Pony:')
    form.radio(name='radio3', tooltip='Field radio3',
               value='value1', selected=False,
               x=110, y=545, buttonStyle='star',
               borderStyle='bevelled', shape='square',
               borderColor=blue, fillColor=green, 
               borderWidth=2,
               textColor=magenta, forceBorder=False)
    form.radio(name='radio3', tooltip='Field radio3',
               value='value2', selected=True,
               x=110, y=545, buttonStyle='star',
               borderStyle='bevelled', shape='circle',
               borderColor=blue, fillColor=green, 
               borderWidth=2,
               textColor=magenta, forceBorder=True)

    c.save()

if __name__ == '__main__':
    create_simple_radios()

我对该代码的问题/疑问是: 1.)收音机始终处于“按下”状态。我该如何解压它们? 2.)可以分组,以便根据组仅按一个(1)单选按钮 3.)以后如何以编程方式读取按钮的状态,例如通过PyPDF2?

谢谢, 教授

版本: 的Python:3.7.3 报告实验室:3.5.19 枕头:6.0.0 PyPDF2:1.26.0

操作系统: Windows10 v1809

1 个答案:

答案 0 :(得分:0)

  

1。)收音机始终处于“按下”状态。我该如何解压它们?

如果form.radio(... selected=True)

,按钮将被按下
  

2。)可以将其分组,以便根据组仅按一个(1)单选按钮吗?

name属性与组名有关。

因此form.radio(... name="group1")是一组form.radio(... name="group2"),是第二组。 每个组只能选择一个电台。

因此,对于前两个问题,我创建了一个包含两个不同组的简单示例。
第一个group包含Fruits,第二个组包含Cars

from reportlab.pdfgen import canvas
from reportlab.pdfbase import pdfform
from reportlab.lib.colors import magenta, pink, blue, green, orange, yellow

def create_radios():
    c = canvas.Canvas('radios.pdf')

    c.setFont("Courier", 20)
    c.drawCentredString(300, 800, 'Radio demo')
    form = c.acroForm

    #GROUP ONE, name='group1'
    c.setFont("Courier", 16)
    c.drawString(10, 680, 'Fruits:')
    c.setFont("Courier", 12)
    c.drawString(10, 650, 'Apple:')
    form.radio(name='group1', tooltip='Apple',
               value='apple', selected=False,
               x=110, y=650, buttonStyle='check',
               borderStyle='solid', shape='square',
               borderColor=blue, fillColor=magenta, 
               textColor=blue, forceBorder=True)

    c.drawString(10, 600, 'Banana:')
    form.radio(name='group1', tooltip='Banana',
               value='banana', selected=False,
               x=110, y=600, buttonStyle='check',
               borderStyle='solid', shape='square',
               borderColor=blue, fillColor=yellow, 
               textColor=blue, forceBorder=True)

    c.drawString(10, 550, 'Orange:')
    form.radio(name='group1', tooltip='Orange',
               value='orange', selected=False,
               x=110, y=550, buttonStyle='check',
               borderStyle='solid', shape='square',
               borderColor=blue, fillColor=orange, 
               textColor=blue, forceBorder=True)

    #GROUP TWO, name='group2'
    c.setFont("Courier", 16)
    c.drawString(210, 680, 'Cars:')
    c.setFont("Courier", 12)
    c.drawString(210, 650, 'Tesla:')
    form.radio(name='group2', tooltip='Apple',
               value='tesla', selected=False,
               x=310, y=650, buttonStyle='circle',
               borderStyle='solid', shape='circle',
               borderColor=blue, fillColor=magenta, 
               textColor=blue, forceBorder=False)

    c.drawString(210, 600, 'Mercedes-Benz:')
    form.radio(name='group2', tooltip='Banana',
               value='mercedes', selected=False,
               x=310, y=600, buttonStyle='circle',
               borderStyle='solid', shape='circle',
               borderColor=blue, fillColor=magenta, 
               textColor=blue, forceBorder=False)

    c.drawString(210, 550, 'Toyota:')
    form.radio(name='group2', tooltip='Orange',
               value='toyota', selected=False,
               x=310, y=550, buttonStyle='circle',
               borderStyle='solid', shape='circle',
               borderColor=blue, fillColor=magenta, 
               textColor=blue, forceBorder=False)

    c.save()



if __name__ == '__main__':
    create_radios()
  

3。)以后如何以编程方式读取按钮的状态,例如通过PyPDF2?

我发现了一种比使用PyPDF2返回的字段数据更简单的方法...

使用pdfminer将很好地解决此问题。

创建radios.pdf后,我使用Adobe更改了值并将其保存为新文件radios_checked.pdf,也可以每个组更改一个selected属性。

import sys
from pdfminer.pdfparser import PDFParser
from pdfminer.pdfdocument import PDFDocument
from pdfminer.pdftypes import resolve1

filename = "radios_checked.pdf"

with open(filename, 'rb') as pdf_file:
    parser = PDFParser(pdf_file)
    doc = PDFDocument(parser)
    fields = resolve1(doc.catalog['AcroForm'])['Fields']
    for i in fields:
        field = resolve1(i)
        name = str(field.get('T'), 'utf-8')

        value = field.get('V') #will return PSLiteral :/ 

        # transform PSLiteral to string
        if value != None:
            value = str(value)
            if value[0] == r"/":
                value = value[2:-1]
                value = str(value)

        print("Group Name: {0},  checked value: {1} ".format(name , value))

这将过滤所有组对象并打印出选定的组名和选定的值。

提示: 在文本编辑器中打开pdf,然后检查常规结构。