socket基本

fd_set用法：

http://blog.sina.com.cn/s/blog_5c8d13830100erzs.htm

socket连接：

 lpszHost="127.0.0.1"
     nPort =
     m_Socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); 

     if (m_Socket == SOCKET_ERROR)
     {
         return false;
     }

     // 构造sockaddr_in结构
     sockaddr_in    ClientAddr;
     ClientAddr.sin_family    = AF_INET;
     ClientAddr.sin_port    = htons(nPort);
     hostent* pHostent = gethostbyname((char*)lpszHost);
     ClientAddr.sin_addr = *((struct in_addr *)pHostent->h_addr);

     if (connect(m_Socket, (SOCKADDR *)&ClientAddr, sizeof(ClientAddr)) == SOCKET_ERROR)
     {
         return false;
     }
     m_bIsRunning = true;
     m_hThread = CreateThread(NULL, , (LPTHREAD_START_ROUTINE)WorkThread, (LPVOID)this, , );

socket连接