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Newsgroups: comp.lang.python
Date: Mon, 30 Jul 2012 02:50:12 -0700 (PDT)
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Subject: Re: newbie: write content in a file (server-side)
From: Thomas Kaufmann <tokauf@googlemail.com>
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Am Sonntag, 29. Juli 2012 17:16:11 UTC+2 schrieb Peter Otten:
> Thomas Kaufmann wrote:
>=20
>=20
>=20
> > I send from a client file content to my server (as bytes). So far so go=
od.
>=20
> > The server receives this content complete. Ok. Then I want to write thi=
s
>=20
> > content to a new file. It works too. But in the new file are only the
>=20
> > first part of the whole content.
>=20
> >=20
>=20
> > What's the problem.
>=20
>=20
>=20
> > Here's my server code:
>=20
>=20
>=20
> >         while True:
>=20
> >             bytes =3D self.request.recv(4096)
>=20
> >             if bytes:
>=20
> >                 s  =3D bytes.decode("utf8")
>=20
> >                 print(s)
>=20
> >                 li =3D s.split("~")
>=20
> >                 with open(li[0], 'w') as fp:
>=20
> >                     fp.write(li[1])
>=20
>=20
>=20
> - Do you ever want to leave the loop?
>=20
>=20
>=20
> - You calculate a new filename on every iteration of the while loop --=20
>=20
> probably not what you intended to do.
>=20
>=20
>=20
> - The "w" argument tells Python to overwrite the file if it exists. You=
=20
>=20
> either need to keep the file open (move the with... out of the loop) or o=
pen=20
>=20
> it with "a".
>=20
>=20
>=20
> - You may not receive the complete file name on the first iteration of th=
e=20
>=20
> while loop.
>=20
>=20
>=20
> - The bytes buffer can contain incomplete characters, e. g.:
>=20
>=20
>=20
> >>> data =3D b"\xc3\xa4"
>=20
> >>> data.decode("utf-8")
>=20
> '=E4'
>=20
> >>> data[:1].decode("utf-8")
>=20
> Traceback (most recent call last):
>=20
>   File "<stdin>", line 1, in <module>
>=20
> UnicodeDecodeError: 'utf8' codec can't decode byte 0xc3 in position 0:=20
>=20
> unexpected end of data


Thanks Peter. It helps;-).