keronenglish.blogg.se - Python 3.5 download program using socket

After that, we put the server into listening mode. 5 here means 5 connections are pending if the server is busy and if the 6th socket tries to establish a connection then the connection is rejected.

After that we bind our server to the specified port. Passing an empty string means that the server can also listen for incoming connections from other computers. If we had passed 127.0.0.1, it would only listen to calls that were made on the local computer.

Then we created a socket object and reserved a port on our computer.

First of all we import the socket we need.

# send a thank you message to the client.

# forever th cycle until we interrupt it or # coming from other computers on the network # this makes the server listen for requests The server has a bind () method that binds it to a specific ip and port so that it can listen for incoming requests to that ip and port. The server has a listen () method that puts the server into listening mode. This allows the server to listen for incoming connections. Finally, the server has accept () and close () methods. The accept method initiates a connection to the client, and the close method closes the connection to the client. The socket library has a sendall function to send data. This function allows you to send data to the server to which the socket is connected, and the server can also send data to the client using this function.Now we need to know how we can send some data via socket.Then we solved the IP address of Google and finally we connected to Google.Output: Socket successfully created the socket has successfully connected to google on port = 173.194.40.19 Print "the socket has successfully connected to google Print " there was an error resolving the host " Print "socket creation failed with error% s" % (err) S = socket.socket (socket.AF_INET, socket.SOCK _STREAM) # Example script to connect to Google using a socket Here is an example script to connect to Google Please Note that if any error occurs during socket creation, socket.error is thrown and we can connect to the server only knowing that it is ip. You can find the IP address of the server using this: $ ping You can also find the IP using Python: import socket ip = socket.gethostbyname ('print ip We can now connect to the server using this socket. AF_INET belongs to the ipv4 address family. SOCK_STREAM stands for connection oriented TCP. Here we made a socket instance and passed two parameters to it. The first parameter - AF_INET, and the second - SOCK_STREAM. import socket s = socket.socket (socket.AF_INET, socket.SOCK_STREAM) Theįamily, type, and proto attributes can beĮxamined to determine the type of socket being returned.Socket programming starts by importing a socket library and creating a simple socket. close ()Ĭreate_connection() uses getaddrinfo() to find candidateĬonnection parameters, and returns a socket opened with theįirst configuration that creates a successful connection. stderr, 'received " %s "' % data finally : print > sys. sendall ( message ) amount_received = 0 amount_expected = len ( message ) while amount_received > sys. stderr, 'sending " %s "' % message sock. stderr try : # Send data message = 'This is the message. stderr, 'Protocol:', protocols print > sys. stderr, 'Family :', families print > sys. create_connection (( 'localhost', 10000 )) print > sys. startswith ( prefix ) ) families = get_constants ( 'AF_' ) types = get_constants ( 'SOCK_' ) protocols = get_constants ( 'IPPROTO_' ) # Create a TCP/IP socket sock = socket. Import socket import sys def get_constants ( prefix ): """Create a dictionary mapping socket module constants to their names.""" return dict ( ( getattr ( socket, n ), n ) for n in dir ( socket ) if n.