Errno 9] Bad file descriptor

[joblack]

> |
> | Starting point:
> | ...
> |         self.status['text'] = 'Processing ...'
> |         try:
> |             cli_main(argv)
> |         except Exception, e:
> |             self.status['text'] = 'Error: ' + str(e)
> |             return
> | ...
> | cli_main:
> |
> |     keypath, inpath, outpath = argv[1:]
> | ...
> |     with open(inpath, 'rb') as inf:
> |         serializer = PDFSerializer(inf, keypath)
> |         with open(outpath, 'wb') as outf:
> |             filenr = outf.fileno()
> |             serializer.dump(outf)
> |     return 0
> |
> | PDFSerializer.dump:
> |
> |     def dump(self, outf):
> |         self.outf = outf
> | ...
>
> See that you set serializer.outf to the outf you open in cli_main?
> Any attempt to use serializer _after_ exiting the "with open(outpath,
> 'wb') as outf" will use serializer.outf, but the outf is now closed.
> And thus itsfiledescriptoris invalid.

Okay, I changed it to a try: ... finally: block where I open the file
and in finally I close it. Nothing has changed. The error still
occures.

Doesn't the

with open(outpath, 'wb') as outf:

clause has to wait until the pdfserialiser.dump method has finished
anyway? IMHO it can't just call it and immediately close it.

At least the try: finally: construct should work? Or does it the same
(call the method and immediately jump to the finally close)?

Would it work if I would write:

with closing(outpath, 'wb') as outf: ?

I'm a little bit confused about Python's strange processing ...