FBB::ClientSocket(3bobcat)

Client Socket
(libbobcat-dev_6.02.02)

2005-2022

NAME

FBB::ClientSocket - Client Socket connecting to a Server in the Internet

SYNOPSIS

#include <bobcat/clientsocket>
Linking option: -lbobcat

DESCRIPTION

An FBB::ClientSocket may be constructed to connect to some server process in the internet. The socket made available by the FBB:ClientSocket may be used to initialize a std::istream and/or std::ostream. The std::istream is used to read information from the server process to which the FBB::ClientSocket connects, The std::ostream is used to send information to the server process to which the FBB::ClientSocket connects. Since a socket may be considered a file descriptor the available FBB::IFdStream, FBB::IFdStreamBuf, FBB::OFdStream, and FBB::OFdStreamBuf classes may be used profitably here. Note that having available a socket does not mean that this defines the communication protocol. It is (still) the responsibility of the programmer to comply with an existing protocol or to implement a tailor-made protocol. The latter situation implies that the sequence of input- and output operations is defined by the programmer.

A Unix Domain client socket can be defined using FBB::LocalClientSocket.

NAMESPACE

FBB
All constructors, members, operators and manipulators, mentioned in this man-page, are defined in the namespace FBB.

INHERITS FROM

FBB::SocketBase

CONSTRUCTOR

ClientSocket(std::string const &host, uint16_t port):
This constructor initializes an FBB::ClientSocket object, preparing it for a connection to the specified port at the given host. An FBB::Exception is thrown if the socket could not be constructed. The construction of the socket does not mean that a connection has actually been established. In order to connect to the server, the member connect() (see below) should be used.

Copy and move constructors (and assignment operators) are not available.

MEMBER FUNCTIONS

All members of FBB::SocketBase (and thus of FBB::InetAddress) are available, as FBB::ClientSocket inherits from these classes.

int connect():
This member returns a socket that can be used to communicate with the server process. An FBB::Exception exception is thrown if the connection could not be established or if the SocketBase base class could not properly be constructed.

EXAMPLE

See also the serversocket(3bobcat) example.


    #include <iostream>
    #include <string>
    #include <bobcat/clientsocket>
    #include <bobcat/ifdstream>
    #include <bobcat/ofdstream>

    using namespace std;
    using namespace FBB;

    int main(int argc, char **argv)
    try
    {
        if (argc == 1)
        {
            cerr << "Provide servername and port number\n";
            return 1;
        }

        size_t     port = stoul(argv[2]);
        ClientSocket client(argv[1], port);
        int fd = client.connect();
        string line;

        cout << "Connecting to socket " << fd << endl <<
                "address = " << client.dottedDecimalAddress() << ", " <<
                                                                 endl <<
                "communication through port " << client.port() << endl;

        IFdStream in(fd);                 // stream to read from
        OFdStream out(fd);                // stream to write to

        while (true)
        {
                                    // Ask for a textline, stop if
            cout << "? ";           // empty / none
            if (!getline(cin, line) || line.length() == 0)
                return 0;
            cout << "Line read: " << line << endl;

                                    // Return the line to the server
            out << line.c_str() << endl;
            cout << "wrote line\n";

            getline(in, line);      // Wait for a reply from the server
            cout << "Answer: " << line << endl;
        }
    }
    catch (Exception const &err)
    {
        cerr << err.what() << "\n" <<
                "Can't connect to " << argv[1] << ", port " <<
                argv[2] << endl;
        return 1;
    }

FILES

bobcat/clientsocket - defines the class interface

BUGS

None Reported.

BOBCAT PROJECT FILES

https://fbb-git.gitlab.io/bobcat/: gitlab project page;
bobcat_6.02.02-x.dsc: detached signature;
bobcat_6.02.02-x.tar.gz: source archive;
bobcat_6.02.02-x_i386.changes: change log;
libbobcat1_6.02.02-x_*.deb: debian package containing the libraries;
libbobcat1-dev_6.02.02-x_*.deb: debian package containing the libraries, headers and manual pages;

BOBCAT

Bobcat is an acronym of `Brokken's Own Base Classes And Templates'.

COPYRIGHT

This is free software, distributed under the terms of the GNU General Public License (GPL).

AUTHOR

Frank B. Brokken (f.b.brokken@rug.nl).