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 avaiable
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.
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.
The copy constructor is 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 <bobcat/clientsocket>
#include <bobcat/ifdstream>
#include <bobcat/ofdstream>
#include <bobcat/a2x>
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 = A2x(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;
}
return 0;
}
catch (Exception const &err)
{
cerr << err.what() << "\n" <<
"Can't connect to " << argv[1] << ", port " <<
argv[2] << endl;
return 1;
}