[Tutor] Practicing with sockets

[Bo Morris]

ok so I finally got all the bytes to be transfered to the server, however I
am unable to open the image on the server; although the filed is saved as a
png file on the server, the server does not recognize the file as png
format?

I changed the loops to the following...

Client:

f = open('/Users/Bo/Desktop/SIG.png', 'r')
strf = f.read()
client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
client_socket.connect(("25.78.28.110", 8999))
while True:
    client_socket.send(struct.pack("!I", len(strf)))
    data = client_socket.sendall(strf)
    if not data:
        break
f.close()
print "Data Received successfully"
exit()

Server:

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
port = 8999
s.bind(('', port))
s.listen(5)
client_socket, address = s.accept()
f = open('img.png', 'w')
while True:
    data = client_socket.recv(4029)
    f.write(data)
    if not data:
        break
    #f.flush()
f.close()
client_socket.close()

On Fri, Oct 31, 2014 at 3:42 PM, Bo Morris <crushed26 at gmail.com> wrote:

> Hey Danny, yes I have been having quite a bit of fun learning to work with
> sockets. Thank you for your response. I have applied what you suggested
> with the exception of the "logging." I read through the logging docs and
> figured logging would be learning for another day. I have a hard time
> enough staying focused on one task at time haha. I did however insert some
> print statements into the code so I could keep track of where it was at,
> but to keep my email short, I omitted them here.
>
> After implementing what you suggested, the image fie that is saved on the
> server is now 4 bytes, but I assume that is due to...
>
> "Your client code will symmetrically read the first four bytes, use
> struct.unpack() to find how how large the rest of the message is going to
> be, and then do a loop until it reads the exact number of bytes"
>
> and I have not quite got the correct loop to read all the bytes?
>
> I also reread the docs at https://docs.python.org/2/howto/sockets.html and
> decided to remove the "b" from "open('myfile.png', 'wb') open('myfile.png',
> 'rb')  seeing how binary could be different depending on the machine and I
> have not yet learned how to deal with this. Would I be better off
> converting the image to base64 prior to sending it to the server, then
> decoding it on the server?
>
> Here is my updated code...for brevity sake, I have omitted the "import"
> statments...
>
> Client:
>
> f = open('/Users/Bo/Desktop/SIG.png', 'r')
> strf = f.read()
> client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
> client_socket.connect(("ip,ip,ip,ip", 8999))
> payload = client_socket.send(struct.pack("!I", len(strf)))
> for data in payload:
>     client_socket.sendall(strf)
> f.close()
> exit()
>
> Server:
>
> s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
> port = 8999
> s.bind(('', port))
> s.listen(5)
> client_socket, address = s.accept()
> data = client_socket.recv(4029)
> f = open('img.png', 'w')
> for item in data:
>     f.write(item)
>     f.flush()
> f.close()
> client_socket.close()
>
> At least I am getting 4 bytes in oppose to 0 like I was getting before.
>
>
>
>
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