Example 1: Hello World Client/Server
This is an example of a program that can run for local IPC or over a network.
The applilcation acts as both a client and a server depending on if the user specifies the "-s" or "--server" argument. To run the full program, first run the program with the "-s" switch, then you can run a second instance of the program without the switch to send the first program the "Hello World" message.
You can customize the destination address to connect to in client mode (to use multiple machines for communication) by specifying "-d <addr>" or "--destination <addr>".
Note: The CmdLineArgProcessor class was used for this to make it easy to implement. You could just as well parse the cmdline by hand. Also, you can customize the port to your liking or even add it as a command line argument input.
#include <Core/Core.h>
#include <Web/Web.h>
#include <CmdLineArgProcessor/ArgProcessor.hpp>
#include <signal.h>
using namespace Upp;
bool run=true;
void sighandler(int sig)
{
run=false;
};
CONSOLE_APP_MAIN
{
signal(SIGABRT, sighandler);
signal(SIGINT, sighandler);
signal(SIGTERM, sighandler);
int port = 7755;
const Vector<String>& cmdline = CommandLine();
ArgProcessor ap("Test Application", "0.1");
Arg<bool> server_arg("Server","Specify to set program to server mode.", false);
Arg<String> host_arg("Destination", "Destination to connect to (client mode).", false);
ArgSet client_args, server_args;
client_args.AddArg(host_arg);
server_args.AddArg(server_arg);
ap.AddArgSet(client_args);
ap.AddArgSet(server_args);
ap.PrintUsageOnError();
ap.ProcessCmdLine(cmdline);
if(!ap.IsError())
{
String host;
if(host_arg.IsSet())
{
host = host_arg.Val();
}
else
{
host = "localhost";
}
if(!server_arg.IsSet())
{
Socket s1;
if( ClientSocket(s1,host,port) )
{
s1.Write("Hello World!");
s1.Close();
}
}
else
{
Cout() << "Server started. Press Ctrl-C to exit.\n";
Socket accept_socket, data_socket;
ServerSocket(accept_socket,port);
while(run)
{
dword ipaddr;
if( accept_socket.Accept(data_socket, &ipaddr) )
{
Cout() << "Connection from " << FormatIP(m_ipaddr) << "\n";
while(data_socket.IsOpen() && !data_socket.IsError() && !data_socket.IsEof())
{
Cout() << data_socket.Read();
}
Cout() << "\n";
data_socket.Close();
}
}
accept_socket.Close();
}
}
}
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