如何编辑 pdf 文件，替换其数据？

Question

我正在尝试旋转 pdf 文件中的页面，然后用相同 pdf 文件中旋转后的页面替换旧页面。

我写了下面的代码：

#!/usr/bin/python

import os
from pyPdf import PdfFileReader, PdfFileWriter

my_path = "/home/USER/Desktop/files/"

input_file_name = os.path.join(my_path, "myfile.pdf")
input_file = PdfFileReader(file(input_file_name, "rb"))
input_file.decrypt("MyPassword")
output_PDF = PdfFileWriter()

for num_page in range(0, input_file.getNumPages()):
    page = input_file.getPage(num_page)
    page.rotateClockwise(270)
    output_PDF.addPage(page)

#Trying to replace old data with new data in the original file, not
#create a new file and add the new data!
output_file_name = os.path.join(my_path, "myfile.pdf")
output_file = file(output_file_name, "wb")
output_PDF.write(output_file)
output_file.close()

上面的代码报错了！我什至尝试使用：

input_file = PdfFileReader(file(input_file_name, "r+b"))

但是也没用...

换行：

output_file_name = os.path.join(my_path, "myfile.pdf")

与：

output_file_name = os.path.join(my_path, "myfile2.pdf")

修复了所有问题，但这不是我想要的...

有什么帮助吗？

错误代码：

Traceback (most recent call last): File "12-5.py", line 22, in output_PDF.write(output_file) File "/usr/lib/pymodules/python2.7/pyPdf/pdf.py", line 264, in write self._sweepIndirectReferences(externalReferenceMap, self._root) File "/usr/lib/pymodules/python2.7/pyPdf/pdf.py", line 339, in _sweepIndirectReferences self._sweepIndirectReferences(externMap, realdata) File "/usr/lib/pymodules/python2.7/pyPdf/pdf.py", line 315, in _sweepIndirectReferences value = self._sweepIndirectReferences(externMap, value) File "/usr/lib/pymodules/python2.7/pyPdf/pdf.py", line 339, in _sweepIndirectReferences self._sweepIndirectReferences(externMap, realdata) File "/usr/lib/pymodules/python2.7/pyPdf/pdf.py", line 315, in _sweepIndirectReferences value = self._sweepIndirectReferences(externMap, value) File "/usr/lib/pymodules/python2.7/pyPdf/pdf.py", line 324, in _sweepIndirectReferences value = self._sweepIndirectReferences(externMap, data[i]) File "/usr/lib/pymodules/python2.7/pyPdf/pdf.py", line 339, in _sweepIndirectReferences self._sweepIndirectReferences(externMap, realdata) File "/usr/lib/pymodules/python2.7/pyPdf/pdf.py", line 315, in _sweepIndirectReferences value = self._sweepIndirectReferences(externMap, value) File "/usr/lib/pymodules/python2.7/pyPdf/pdf.py", line 324, in _sweepIndirectReferences value = self._sweepIndirectReferences(externMap, data[i]) File "/usr/lib/pymodules/python2.7/pyPdf/pdf.py", line 345, in _sweepIndirectReferences newobj = data.pdf.getObject(data) File "/usr/lib/pymodules/python2.7/pyPdf/pdf.py", line 649, in getObject retval = readObject(self.stream, self) File "/usr/lib/pymodules/python2.7/pyPdf/generic.py", line 67, in readObject return DictionaryObject.readFromStream(stream, pdf) File "/usr/lib/pymodules/python2.7/pyPdf/generic.py", line 564, in readFromStream raise utils.PdfReadError, "Unable to find 'endstream' marker after stream." pyPdf.utils.PdfReadError: Unable to find 'endstream' marker after stream.

Answer 1

我怀疑问题是 PyPDF 在写入文件时正在读取文件。

正如您所注意到的，正确的解决方法是写入一个单独的文件，然后用新文件替换原始文件。像这样：

output_file_name = os.path.join(my_path, "myfile-temporary.pdf")
output_file = file(output_file_name, "wb")
output_PDF.write(output_file)
output_file.close()
os.rename(output_file_name, input_file_name)

我写了一些代码来简化这个：https://github.com/shazow/unstdlib.py/blob/master/unstdlib/standard/contextlib_.py#L14

from unstdlib.standard.contextlib_ import open_atomic

with open_atomic(input_file_name, "wb") as output_file:
    output_PDF.write(output_file)

这将自动创建一个临时文件，写入其中，然后替换原始文件。

编辑：我最初误读了这个问题。以下是我不正确但可能对其他人有帮助的答案。

您的代码很好，应该可以在 "most" PDF 上正常运行。

您遇到的问题是 PyPDF 与您尝试使用的特定 PDF 不兼容。这可能是 PyPDF 中的错误，也可能是 PDF 不完全有效。

您可以尝试两件事：

看看PyPDF2能否读取文件。使用 pip install PyPDF2 安装 PyPDF2，将 import pyPdf … 替换为 import PyPDF2 …，然后重新运行您的脚本。
使用另一个程序重新编码您的 PDF，看看是否可行。例如，使用 convert bad.pdf bad.ps; convert bad.ps maybe-good.pdf 之类的东西可能 可以解决问题。

如何编辑 pdf 文件，替换其数据？

How to edit a pdf file, replacing its data?

python

pdf

edit

pypdf