------ Build started: Project: winsockTest1, Configuration: Debug Win32 ------
Compiling...
main.cpp
Linking...
main.obj : error LNK2001: unresolved external symbol _WSACleanup@0
main.obj : error LNK2001: unresolved external symbol "int __cdecl DoWinsock(char const *,int)" (?DoWinsock@@YAHPBDH@Z)
main.obj : error LNK2001: unresolved external symbol _WSAStartup@8
C:\Documents an...\winsockTest1\Debug\winsockTest1.exe : fatal error LNK1120: 3 unresolved externals

#include <winsock.h>
#include <stdlib.h>
#include <iostream>

using namespace std;

extern int DoWinsock(const char* pcHost, int nPort);

const int kDefaultServerPort = 4242; //default port to connect to on server

int main(int argc, char* argv[])
{
    //test for enough arguments
    if (argc < 2)
    {
        cerr<<"usage: "<<argv[0]<<" <server-address> [server-port]"<<endl<<endl;
        cerr<<"\tIf you don't pass server-port, it defaults to "<<kDefaultServerPort<<"."<<endl;
        return 1;
    }

    //get host and (optionally) port from command line
    const char* pcHost = argv[1];
    int nPort = kDefaultServerPort;

    if (argc >= 3)
    {
        nPort = atoi(argv[2]);
    }

    //sanity check
    int nNumArgsIgnored = (argc - 3);
    
    if (nNumArgsIgnored > 0)
    {
        cerr<<nNumArgsIgnored<<" extra argument"<<(nNumArgsIgnored == 1 ? "" : "s")<<" ignored."<<endl;
    }

    //start Winsock
    WSAData wsaData;
    int nCode;
    
    if ((nCode = WSAStartup(MAKEWORD(1, 1), &wsaData)) != 0)
    {
        cerr<<"WSAStartup() returned error code "<<nCode<<"."<<endl;
        return 255;
    }

    //call main example routine
    int retVal = DoWinsock(pcHost, nPort);

    //shut Winsock down
    WSACleanup();
    return retVal;
}