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newbie: write content in a file (server-side)

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  newbie: write content in a file (server-side) Thomas Kaufmann <tokauf@googlemail.com> - 2012-07-29 07:16 -0700
    Re: newbie: write content in a file (server-side) Peter Otten <__peter__@web.de> - 2012-07-29 17:16 +0200
      Re: newbie: write content in a file (server-side) Thomas Kaufmann <tokauf@googlemail.com> - 2012-07-30 02:50 -0700
      Re: newbie: write content in a file (server-side) Thomas Kaufmann <tokauf@googlemail.com> - 2012-07-30 02:50 -0700
    Re: newbie: write content in a file (server-side) Thomas Kaufmann <tokauf@googlemail.com> - 2012-07-30 02:51 -0700

#26188 — newbie: write content in a file (server-side)

Hi,

I send from a client file content to my server (as bytes). So far so good.
The server receives this content complete. Ok. Then I want to write this content to a new file. It works too. But in the new file are only the first part of the whole content.

What's the problem. 

o-o

Thomas

Here's my server code:



import socketserver

class MyTCPServer(socketserver.BaseRequestHandler):

    def handle(self):
        
        s  = '' 
        li = []
        addr = self.client_address[0]
        print("[{}] Connected! ".format(addr))
        while True:
            
            bytes = self.request.recv(4096)
            if bytes:
                s  = bytes.decode("utf8")
                print(s)
                li = s.split("~")
                with open(li[0], 'w') as fp:
                    fp.write(li[1])        
                
#... main ......................................................
                
if __name__ == "__main__":

    server = socketserver.ThreadingTCPServer(("", 12345), MyTCPServer)
    server.serve_forever()

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#26196

Thomas Kaufmann wrote:

> I send from a client file content to my server (as bytes). So far so good.
> The server receives this content complete. Ok. Then I want to write this
> content to a new file. It works too. But in the new file are only the
> first part of the whole content.
> 
> What's the problem.

> Here's my server code:

>         while True:
>             bytes = self.request.recv(4096)
>             if bytes:
>                 s  = bytes.decode("utf8")
>                 print(s)
>                 li = s.split("~")
>                 with open(li[0], 'w') as fp:
>                     fp.write(li[1])

- Do you ever want to leave the loop?

- You calculate a new filename on every iteration of the while loop -- 
probably not what you intended to do.

- The "w" argument tells Python to overwrite the file if it exists. You 
either need to keep the file open (move the with... out of the loop) or open 
it with "a".

- You may not receive the complete file name on the first iteration of the 
while loop.

- The bytes buffer can contain incomplete characters, e. g.:

>>> data = b"\xc3\xa4"
>>> data.decode("utf-8")
'ä'
>>> data[:1].decode("utf-8")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
UnicodeDecodeError: 'utf8' codec can't decode byte 0xc3 in position 0: 
unexpected end of data

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#26238

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


Thanks Peter. It helps;-).

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#26240

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


Thanks Peter. It helps;-).

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#26239

Am Sonntag, 29. Juli 2012 16:16:01 UTC+2 schrieb Thomas Kaufmann:
> Hi,
> 
> 
> 
> I send from a client file content to my server (as bytes). So far so good.
> 
> The server receives this content complete. Ok. Then I want to write this content to a new file. It works too. But in the new file are only the first part of the whole content.
> 
> 
> 
> What's the problem. 
> 
> 
> 
> o-o
> 
> 
> 
> Thomas
> 
> 
> 
> Here's my server code:
> 
> 
> 
> 
> 
> 
> 
> import socketserver
> 
> 
> 
> class MyTCPServer(socketserver.BaseRequestHandler):
> 
> 
> 
>     def handle(self):
> 
>         
> 
>         s  = '' 
> 
>         li = []
> 
>         addr = self.client_address[0]
> 
>         print("[{}] Connected! ".format(addr))
> 
>         while True:
> 
>             
> 
>             bytes = self.request.recv(4096)
> 
>             if bytes:
> 
>                 s  = bytes.decode("utf8")
> 
>                 print(s)
> 
>                 li = s.split("~")
> 
>                 with open(li[0], 'w') as fp:
> 
>                     fp.write(li[1])        
> 
>                 
> 
> #... main ......................................................
> 
>                 
> 
> if __name__ == "__main__":
> 
> 
> 
>     server = socketserver.ThreadingTCPServer(("", 12345), MyTCPServer)
> 
>     server.serve_forever()


Thanks a lot. It helps.

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