C / C++ / MFC

  // open a socket 
  cout << "Creating a socket..." << endl ; 
  SOCKET hListenSocket = socket( AF_INET , SOCK_STREAM , 0 ) ; 
  if ( hListenSocket == INVALID_SOCKET )
  {
    cout << "ERROR: Can't create the socket." << endl ; 
    exit( 1 ) ; 
  }
  cout << "- hListenSocket=" << hListenSocket << endl ; 
 
  // initialize the host address 
  struct hostent* pHostEnt = gethostbyname( pHostAddress ) ;
  if ( pHostEnt == NULL )
  {
    cout << "ERROR: Can't resolve the host name: " << pHostAddress << endl ; 
    exit( 1 ) ; 
  }
  in_addr hostAddress = *((struct in_addr *)pHostEnt->h_addr_list[0]) ;
 
  // bind the socket 
  cout << "Binding the socket." << endl ;
  sockaddr_in addr ;
  addr.sin_family = AF_INET ;
  addr.sin_addr.s_addr = hostAddress.s_addr ;
  addr.sin_port = htons( portNo ) ;
  int rc = bind( hListenSocket , (sockaddr*)&addr , sizeof(addr) ) ; 
  if ( rc != 0 )
  {
    cout << "ERROR: Can't bind the socket ; rc=" << rc << endl ; 
    exit( 1 ) ; 
  }
   
  // start listening on the socket 
  cout << "Listening on the socket..." << endl ;
  rc = listen( hListenSocket , SOMAXCONN ) ;
  if ( rc != 0 )
  {
    cout << "ERROR: Can't listen on the socket ; rc=" << WSAGetLastError() << endl ;
    exit( 1 ) ; 
  }
 
  // create an event that will be flagged when somebody tries to connect 
  WSAEVENT hConnectEvent = WSACreateEvent() ;
  rc = WSAEventSelect( hListenSocket , hConnectEvent , FD_ACCEPT ) ;
  if ( rc != 0 )
  {
    cout << "ERROR: Can't set the connect event ; rc=" << WSAGetLastError() << endl ; 
    exit( 1 ) ; 
  }
 
  // wait for a connection 
  cout << "Waiting for a connection..." << endl ; 
  SOCKET hSocket = WSAAccept( hListenSocket , NULL , NULL , NULL , NULL ) ; 
/***** FAILS HERE! 0 GETS RETURNED *****/
  if ( hSocket == INVALID_SOCKET )                                
  {
    cout << "- Connection pending..." << endl ; 
    WSAEVENT hEvents[1] ;
    hEvents[0] = hConnectEvent ;
    DWORD rc = WSAWaitForMultipleEvents( 1 , hEvents , FALSE , INFINITE , FALSE ) ; 
    if ( rc == WSA_WAIT_EVENT_0 )
    {
      cout << "Connection received." << endl ;
      hSocket = WSAAccept( hListenSocket , NULL , NULL , NULL , NULL ) ; 
      cout << "- hSocket=" << hSocket << endl ; 
      onServerConnection( hSocket ) ; 
    }
  }
  else 
  {
    cout << "- Connection received immediately ; hSocket=" << hSocket << endl ; 
    onServerConnection( hSocket ) ; 
  }