Create an iostream using boost asio specifying ip and port

Question

I have a problem concerning boost asio libraries. I successfully tried to create a socket between a client and a server, this involves creation of resolvers in order to specify

Answer 1

The boost asio sample code you quoted:

tcp::iostream s(argv[1], "daytime");

uses "daytime" as a lookup into the services table (usually in /etc/services on a linux system), which would identify that the port for the daytime service is 13.

If you want to connect to a port that is not one of the well known services, you can do so with something like:

tcp::iostream s("localhost", "57002"); 

Note that the port number is supplied as a string, not as an unsigned short integer as one might be tempted to try.

Of course, "localhost" can be replaced with an IP address "127.0.0.1"