想不通 此函数(用于将互联网站点抓取为 pdf 的类的一部分)应该合并使用 pypdf 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()
我一直收到这个错误:
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?
我很乐意提供任何帮助
最佳答案
好的,我发现了你的问题。您调用 file()
是正确的。根本不要尝试调用 open()
。
你的问题是当你调用 self.pdfoutput.write(self._pdfstream)
时,input 文件仍然需要打开,所以你需要删除行 self._filestream.close()
.
编辑:此脚本将触发问题。第一次写入会成功,第二次会失败。
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()
关于python - 关闭 python pypdf 的问题 - 写作。获取 valueError : I/O operation on closed file,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/6773631/