I've set up a basic socket server/client script - hope to somehow implement it in website, and have seen that it's possible to do app to app?
anyway, can't seem to prevent user from crashing the server or client if they enter a blank message (ie. hit return without entering any text/data). Is there an easy way to prevent this?
server.py
def server_program():
# get the hostname
host = socket.gethostname()
port = 8000 # initiate port no above 1024
server_socket = socket.socket() # get instance
# look closely. The bind() function takes a tuple as argument
server_socket.bind((host, port)) # bind host address and port together
# configure how many clients the server can listen to simultaneously
server_socket.listen(2)
conn, address = server_socket.accept() # accept new connection
print("Connection from: " + str(address) + " Now wait for message")
while True:
# receive data stream. it won't accept data packet greater than 1024 bytes
data = conn.recv(1024).decode()
#conn.sendall(data)
if not data:
# if data is not received break
break
print("from Client: " + str(data))
data = input('Enter message:-> ')
conn.send(data.encode()) # send data to the client
print('message sent!')
conn.close() # close the connection
if __name__ == '__main__':
server_program()
client py:
import socket
def client_program(): host = socket.gethostname() # as both code is running on same pc port = 8000 # socket server port number
client_socket = socket.socket() # instantiate
client_socket.connect((host, port)) # connect to the server
message = input(" Enter message:-> ") # take input
while message.lower().strip() != 'bye':
client_socket.send(message.encode()) # send message
data = client_socket.recv(1024).decode() # receive response
print('Received from SERVER: ' + data) # show in terminal
message = input("Please send a message:-> ") # again take input
client_socket.close() # close the connection
if name == 'main': client_program()
this works fine (have added: import socket to top line of server.py) - if users behave correctly but if one person hits return at the wrong time, or tries sending two message then the whole thing just hangs
So I want to fix that and then somehow add it to my web page/app - can that be done?
Don't just send the message. Check that it is not blank and then decide if it's a message that you wanted to send or if it's just a return.
I'm not usre I understand what you mean by sending 2 messages at the same time. I don't see anything in the code that would allow simultaneous sending of 2 messages.
I've tried various methods for that , for ex I've inserted:
glenn
|
10036
posts
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PythonAnywhere staff
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if data == None
conn.send(data.encode()
if data = False
while data != ' '
etc... all sorts of combinations and none of them do the trick
what am I doing wrong here?
tried this just now:
server.py
while True:
data = input('Enter message:-> ')
if data != ' ':
conn.send(data.encode()) # send data to the client
print('message sent!')
else:
print('cannot send blank message!')
conn.close() # close the connection
client.py
if data == None:
print('Recieved blank message!') # show in terminal
else:
print('Received from server: ' + data) # show in terminal
message = input(" -> ") # again take input
client_socket.close() # close the connection
this doesn't really sort it
Are you sure that data is None when the user doesn't enter a message? Also, you're not changing anything - you're still running the code that sends the message when data is None (assuming it ever is).
Your first attempt looks like it may work if data is an empty string when the user just hits return.
