C++ WinSock Sample Code

Server

#include<iostream>
#include<Windows.h>
 
using namespace std;
 
void ErrorHandling(char* msg);
  
int main(int argc,char* argv[]){
    WSADATA wsaData;
    SOCKET serverSock,clientSock;
    SOCKADDR_IN serverAddr,clientAddr;
    int clientAddrSize;
    if(argc!=2){
        cout<<"Usage : "<<argv[0]<<" <port>"<<endl;
        exit(1);
    }
    if(WSAStartup(MAKEWORD(2,2),&wsaData)!=0)
        ErrorHandling("WSAStartup() error!");
    
    serverSock=socket(PF_INET,SOCK_STREAM,0); 
    
    memset(&serverAddr,0,sizeof(serverAddr));
    serverAddr.sin_family=AF_INET;
    serverAddr.sin_addr.s_addr=htonl(INADDR_ANY);
    serverAddr.sin_port=htons(atoi(argv[1]));
    
    if(bind(serverSock,(SOCKADDR*)&serverAddr,sizeof(serverAddr))==SOCKET_ERROR) 
        ErrorHandling("bind() error");
    if(listen(serverSock,5)==SOCKET_ERROR)
        ErrorHandling("listen() error");
    
    clientAddrSize=sizeof(clientAddr);
    clientSock=accept(serverSock,(SOCKADDR*)&clientAddr,&clientAddrSize);
    cout<<"Connected Client IP : "<<inet_ntoa(clientAddr.sin_addr)<<endl;
    closesocket(serverSock);
    WSACleanup();
    return 0;
}
 
void ErrorHandling(char* msg){
    fputs(msg,stderr);
    fputc('\n',stderr);
    exit(1);
}

 

Client

#include<iostream>
#include<Windows.h>
 
 using namespace std;
 
void ErrorHandling(char* msg);
 
int main(int argc,char* argv[]){
    WSADATA wsaData;
    SOCKET sock;
    SOCKADDR_IN serverAddr;
    if(argc!=3){
        cout<<"Usage : "<<argv[0]<<" <IP> <port> "<<endl;
        exit(1);
    }
    if(WSAStartup(MAKEWORD(2,2),&wsaData)!=0)
        ErrorHandling("WSAStartup() error!");
 
    sock=socket(PF_INET,SOCK_STREAM,0);
 
    memset(&serverAddr,0,sizeof(serverAddr));
    serverAddr.sin_family=AF_INET;
    serverAddr.sin_addr.s_addr=inet_addr(argv[1]);
    serverAddr.sin_port=htons(atoi(argv[2]));
 
    if(connect(sock,(SOCKADDR*)&serverAddr,sizeof(serverAddr))==SOCKET_ERROR)
        ErrorHandling("connect() error");
 
    closesocket(sock);
    WSACleanup();
    return 0;
}
 
void ErrorHandling(char* msg){
    fputs(msg,stderr);
    fputc('\n',stderr);
    exit(1);
}