关闭 python pypdf 的问题 - 写作。获取 valueError: 对已关闭文件的 I/O 操作

Question

想不通 此功能（用于将网站抓取为 pdf 的类的一部分）应该使用 pypdf 合并从网页生成的 pdf 文件。

这是方法代码：

def mergePdf(self,mainname,inputlist=0):
    """merging the pdf pages
    getting an inputlist to merge or defaults to the class instance self.pdftomerge list"""
    from pyPdf import PdfFileWriter, PdfFileReader
    self._mergelist = inputlist or self.pdftomerge
    self.pdfoutput = PdfFileWriter()

    for name in self._mergelist:
        print "merging %s into main pdf file: %s" % (name,mainname)
        self._filestream = file(name,"rb")
        self.pdfinput = PdfFileReader(self._filestream)
        for p in self.pdfinput.pages:
            self.pdfoutput.addPage(p)
        self._filestream.close()

    self._pdfstream = file(mainname,"wb")
    self._pdfstream.open()
    self.pdfoutput.write(self._pdfstream)
    self._pdfstream.close()

我不断收到此错误：

  File "c:\tmp\easy_install-iik9vj\pyPdf-1.13-py2.7-win32.egg.tmp\pyPdf\pdf.py", line 264, in write
    self._sweepIndirectReferences(externalReferenceMap, self._root)
  File "c:\tmp\easy_install-iik9vj\pyPdf-1.13-py2.7-win32.egg.tmp\pyPdf\pdf.py", line 339, in _sweepIndirectReferences
    self._sweepIndirectReferences(externMap, realdata)
  File "c:\tmp\easy_install-iik9vj\pyPdf-1.13-py2.7-win32.egg.tmp\pyPdf\pdf.py", line 315, in _sweepIndirectReferences
    value = self._sweepIndirectReferences(externMap, value)
  File "c:\tmp\easy_install-iik9vj\pyPdf-1.13-py2.7-win32.egg.tmp\pyPdf\pdf.py", line 339, in _sweepIndirectReferences
    self._sweepIndirectReferences(externMap, realdata)
  File "c:\tmp\easy_install-iik9vj\pyPdf-1.13-py2.7-win32.egg.tmp\pyPdf\pdf.py", line 315, in _sweepIndirectReferences
    value = self._sweepIndirectReferences(externMap, value)
  File "c:\tmp\easy_install-iik9vj\pyPdf-1.13-py2.7-win32.egg.tmp\pyPdf\pdf.py", line 324, in _sweepIndirectReferences
    value = self._sweepIndirectReferences(externMap, data[i])
  File "c:\tmp\easy_install-iik9vj\pyPdf-1.13-py2.7-win32.egg.tmp\pyPdf\pdf.py", line 339, in _sweepIndirectReferences
    self._sweepIndirectReferences(externMap, realdata)
  File "c:\tmp\easy_install-iik9vj\pyPdf-1.13-py2.7-win32.egg.tmp\pyPdf\pdf.py", line 315, in _sweepIndirectReferences
    value = self._sweepIndirectReferences(externMap, value)
  File "c:\tmp\easy_install-iik9vj\pyPdf-1.13-py2.7-win32.egg.tmp\pyPdf\pdf.py", line 345, in _sweepIndirectReferences
    newobj = data.pdf.getObject(data)
  File "c:\tmp\easy_install-iik9vj\pyPdf-1.13-py2.7-win32.egg.tmp\pyPdf\pdf.py", line 645, in getObject
    self.stream.seek(start, 0)
ValueError: I/O operation on closed file

但是当我检查 self._pdfstream 的状态时，我得到：

<open file 'c:\python27\learn\dive.pdf', mode 'wb' at 0x013B2020>

我做错了什么？

我会很高兴得到任何帮助

Answer 1

好的，我发现了你的问题。你打电话给file()是对的。千万不要尝试拨打open()。

你的问题是调用self.pdfoutput.write(self._pdfstream)时输入文件仍然需要打开，所以你需要删除self._filestream.close()这一行。

编辑：此脚本将触发问题。第一次写入成功，第二次失败。

from pyPdf import PdfFileReader as PfR, PdfFileWriter as PfW

input_filename = 'in.PDF' # replace with a real file
output_filename = 'out.PDF' # something that doesn't exist

infile = file(input_filename, 'rb')
reader = PfR(infile)
writer = PfW()

writer.addPage(reader.getPage(0))
outfile = file(output_filename, 'wb')
writer.write(outfile)
print "First Write Successful!"
infile.close()
outfile.close()

infile = file(input_filename, 'rb')
reader = PfR(infile)
writer = PfW()

writer.addPage(reader.getPage(0))
outfile = file(output_filename, 'wb')
infile.close() # BAD!

writer.write(outfile)
print "You'll get an IOError Before this line"
outfile.close()