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#include<iostream>
#include<string>
#include<sstream>
#include<Ws2tcpip.h> //used instead of "Winsock2.h"
//using namespace std;
#define MAX_DATA 1024 //maximum bytes could be sent or received
void initiateWinsockFacility()
{
WORD wVersionRequested;
WSADATA wsaData;
int error;
wVersionRequested = MAKEWORD(2, 2);
error = WSAStartup(wVersionRequested, &wsaData);
if (error != 0)
{
std::cerr<<"WSAStartup failed with error: "<<error<<std::endl;
system("pause");
exit(-1);
}
}
//output, to serverInfo, full information about the connection to be made
void getFullAddressInformation(std::string ipAddress, std::string portNumber, const struct addrinfo giveHints, struct addrinfo *receiveServerInfo)
{
int status = getaddrinfo(ipAddress.c_str(), portNumber.c_str(), &giveHints, &receiveServerInfo);
if(status != 0)
{
std::cerr<<"getaddrinfo() error: "<< gai_strerror(status) <<std::endl;
WSACleanup();
system("pause");
exit(-1);
}
}
int main()
{
struct addrinfo hints; //input connection type and ip type
struct addrinfo *serverInfo = NULL; //holds full address information of a server
SOCKET socketFileDescriptor;
char userInput[MAX_DATA];
char serverResponse[MAX_DATA];
std::string ip;
std::string port;
initiateWinsockFacility();
system("cls");
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_STREAM;
std::cout<<"Please enter server's IP: ";
getline(std::cin, ip);
std::cout<<"Please enter port's number: ";
getline(std::cin, port);
std::cout<<"SOMETHING GOES WRONG IN HERE!"<<std::endl;
system("pause");
getFullAddressInformation(ip, port, hints, serverInfo);
try
{
socketFileDescriptor = socket(serverInfo->ai_family, serverInfo->ai_socktype, serverInfo->ai_protocol);
if(socketFileDescriptor == INVALID_SOCKET )
{
std::cerr<<"socket() error: " << WSAGetLastError() <<std::endl;
throw 1;
}
std::cout<<"connecting to the server ..."<<std::endl;
int connectStatus = connect(socketFileDescriptor, serverInfo->ai_addr, serverInfo->ai_addrlen);
if(connectStatus == SOCKET_ERROR)
{
std::cerr<<"connect() error: " << WSAGetLastError() <<std::endl;
throw 2;
}
//send and receive messages
while(true)
{
std::cout<<"\nyou: ";
std::cin.getline(userInput, MAX_DATA);
if(std::cin.fail())
{
std::cerr<<"Overflow occured. Restart Application"<<std::endl;
throw 2;
}
int bytes_sent = send(socketFileDescriptor, userInput, strlen(userInput), 0);
//chack whther bytes are sent fully or not
while(bytes_sent != strlen(userInput))
{
//if bytes not sent fully, then see if its equal to socket error or not
//if it is, then throw an error. If it isn't then ask user to resend data
if(bytes_sent == SOCKET_ERROR)
{
std::cerr<<"send() error: " << WSAGetLastError() <<std::endl;
throw 2;
}
//re-send
std::cout<<"\nyou: ";
std::cin.getline(userInput, MAX_DATA);
if(std::cin.fail())
{
std::cerr<<"Overflow occured. Restart Application"<<std::endl;
throw 2;
}
int bytes_sent = send(socketFileDescriptor, userInput, strlen(userInput), 0);
}
int bytes_received = recv(socketFileDescriptor, serverResponse, MAX_DATA, 0);
//make sure the returned value is socket error and not zero
if((bytes_received == SOCKET_ERROR) && (bytes_received != 0))
{
std::cerr<<"recv() error: " << WSAGetLastError() <<std::endl;
throw 2;
}else{ //returned value is zero which means the server shut down
std::cout<<"server shut down"<< std::endl;
break;
}
std::string echoedMsg(serverResponse, bytes_received);
std::cout<<"server: "<< echoedMsg << std::endl;
}
}
catch(int v)
{
if(v == 1)
{
freeaddrinfo(serverInfo);
WSACleanup();
system("pause");
exit(-1);
}
if(v == 2)
{
closesocket(socketFileDescriptor);
freeaddrinfo(serverInfo);
WSACleanup();
system("pause");
exit(-1);
}
}
closesocket(socketFileDescriptor);
freeaddrinfo(serverInfo);
WSACleanup();
system("pause");
return 0;
}
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