通过域名进行socket

请问如何利用SOCKET解析域名？
 比如我的一台服务器是绑定了域名，那些客户端想和服务器进行通信，但只能通过域名来通信。
 那该如何利用SOCKET靠域名和服务器通信啊？

1. #pragma comment(lib, "ws2_32")
   
2. 
   
3. #include <winsock2.h>
   
4. #include <stdio.h>
   
5. #include <assert.h>
   
6. 
   
7. int main()
   
8. {
   
9.     struct hostent *host;
   
10.     WSADATA wsaData;
    
11.     int ret;
    
12. 
    
13.     ret = WSAStartup(0x0202, &wsaData);
    
14.     if(ret)
    
15.     {
    
16.         printf("error in WSAStartup: %d\n", WSAGetLastError());
    
17.         return 0;
    
18.     }
    
19. 
    
20.     host = gethostbyname("www.baidu.com");
    
21.     if(host == NULL)
    
22.     {
    
23.         printf("error in gethostbyname: %d\n", WSAGetLastError());
    
24.     }
    
25.     else
    
26.     {
    
27.         printf("name: %s\naddrtype; %d\naddrlength: %d\n",
    
28.             host->h_name, host->h_addrtype, host->h_length);
    
29.         printf("ip address: %s\n",
    
30.             inet_ntoa(*(struct in_addr*)host->h_addr_list[0]));
    
31.     }
    
32. 
    
33.     WSACleanup();
    
34.     return 0;
    
35. }

 输出：
 name: www.a.shifen.com
 addrtype; 2
 addrlength: 4
 ip address: 202.108.22.5