#include <iostream>
#include <windows.h>
#include <winsock2.h>
using namespace std;
#pragma comment(lib,"WS2_32.lib")


int main(int argc, char* argv[])
{
	char message[4096];
	char inmessage[4096];
	int error;
	WSAData wsaData;

	error=WSAStartup(MAKEWORD(2,2), &wsaData); // Startup winsock
	if(error==SOCKET_ERROR)
	{
		cout << "Could not start up winsock!" << endl;
		cin >> error;
                return 0;
	}
	cout << endl << "Winsock started" << endl;
	
	int mysocket=socket(AF_INET,SOCK_STREAM,0); // Create a socket
	if(mysocket==SOCKET_ERROR)
	{
		cout << "Error opening socket" << endl;
		cin >> error;
                return 0;
	}
	cout << "Socket Opened" << endl;
	
	struct sockaddr_in server;
	
	server.sin_family=AF_INET;
	server.sin_port=htons(7654);
	server.sin_addr.s_addr=INADDR_ANY;
	error=bind(mysocket, (sockaddr*)&server,sizeof(server)); // Bind socket to port
	if(error==SOCKET_ERROR)
	{
		cout << "Error binding socket to port" << endl;
                cin >> error;
                return 0;
	}

	error=listen(mysocket,5); // Listen for connections
	if(error== SOCKET_ERROR)
	{
		cout << endl << "Error Listening for connection" << endl;
		cin >> error;
                return 0;
	}
	
	int clientsocket;
	clientsocket=accept(mysocket,0,0); // Accept connections from clients
	if(clientsocket== SOCKET_ERROR)
	{
		cout << endl << "Error accepting connection";
                cin >> error;
                return 0;
	}

	int nbytes;
	while(1)
	{
		strcpy(message,"Hello person");
		nbytes=send(clientsocket,message,sizeof(message),0);
		if(nbytes == SOCKET_ERROR)
		{
			cout << "Error sending data" << endl;
			cin >> error;
                        return 0;
		}
                nbytes=recv(clientsocket,inmessage,sizeof(inmessage),0);
		if(nbytes == SOCKET_ERROR)
		{
			cout << "Error receiving message" << endl;
			cin >> error;
                        return 0;
		}
		else if(nbytes!=0)
		{
			cout << "inmessage: '" << inmessage << "'" << endl;
                        // output: inmessage: '<value_of_inmessage>' 
                        // followed by: inmessage: '' on the line below it
		}
	}

	return 0;
}

#include <iostream>
#include <windows.h>
#include <winsock2.h>
#pragma comment(lib, "WS2_32.lib")

int main(int argc, char* argv[])
{
	char message[4096];
	char inmessage[4096];
	int error;
	WSAData wsaData;
	
	error=WSAStartup(MAKEWORD(2,2), &wsaData); // Startup winsock
	if(error==SOCKET_ERROR)
	{
		cout << endl << "Error starting winsock" << endl;
		cin >> error;
                return 0;
	}
	
	SOCKET mysocket=socket(AF_INET, SOCK_STREAM, 0); // Create a socket
	if(mysocket==SOCKET_ERROR)
	{
		cout << endl << "Error Opening Socket" << endl;
		cin >> error;
                return 0;
	}
	cout << endl << "Socket Opened";
	
	char server_name[40];
	cout << endl << "What is the ip address of the server that you would like to connect to? ";
	cin >> server_name;
	cout << "server ip address= " << server_name;
	struct hostent *host_entry;
	host_entry = gethostbyname(server_name); // Try to locate the host
	if(host_entry==NULL)
	{
		cout << endl << "Could not find a host" << endl;
		cin >> error;
                return 0;
	}
	
	// Setup the information required to connect to the host
	struct sockaddr_in server;
	server.sin_family = AF_INET; // Server is either on a local network or  
								 // the world wide web
	server.sin_port = htons((unsigned short) 7654);
	server.sin_addr.s_addr = *(unsigned long *) host_entry->h_addr;
	
	error=connect(mysocket, (sockaddr *)&server, sizeof(server));  // Connect to the server
	
	if(error==SOCKET_ERROR)
	{
		cout << endl << "Error connecting to server" << endl;
		cin >> error;
                return 0;
	}

	int nbytes;
	while(1)
	{
		nbytes = recv(mysocket,inmessage,sizeof(inmessage),0);
		if(nbytes == SOCKET_ERROR)
		{
			cout << "error receiving message" << endl;
			cin >> error;
                        return 0;
		}
		cout << "inmessage: '" << inmessage << "'" << endl;
		cout << "message? " << endl;
		cin.ignore();
		cin.getline(message,sizeof(message),'\n');
		cout << "message: '" << message << "'" << endl;
		nbytes = send(mysocket,message,sizeof(message),0);
		if(nbytes == SOCKET_ERROR)
		{
			cout << "Error sending message" << endl;
			cin >> error;
                        return 0;
		}

	}
	
	cin.ignore();
        cin.get();

	return 0;
}

inmessage: 'hello world'
inmessage: ''

else if(nbytes!=0)
{
	cout << "inmessage: '" << inmessage << "'" << endl;
        // output: inmessage: '<value_of_inmessage>' 
        // followed by: inmessage: '' on the line below it
}