一个简单主机地址查询程序的问题。谢谢！

compile 通过，build出现七个错误
如下：
-------------------Configuration: getIP - Win32 Debug--------------------
Linking...
main.obj : error LNK2001: unresolved external symbol _WSACleanup@0
main.obj : error LNK2001: unresolved external symbol _gethostbyaddr@12
main.obj : error LNK2001: unresolved external symbol _inet_addr@4
main.obj : error LNK2001: unresolved external symbol _inet_ntoa@4
main.obj : error LNK2001: unresolved external symbol _gethostbyname@4
main.obj : error LNK2001: unresolved external symbol _WSAStartup@8
Debug/getIP.exe : fatal error LNK1120: 6 unresolved externals
Error executing link.exe.

getIP.exe - 7 error(s), 0 warning(s)
源程序如下：
#include <winsock.h>
#define PROG_NAME "DNS Lookup"
#define HOST_NAME "YOUR.COM"
#define WINSOCK_VERSION 0x0101
#define PF_INET_LENGTH 4

#define HOST_ADDR "192.79.26.27"

int PASCAL WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nShowCmd)
{
WSADATA wsaData;
LPHOSTENT lpHostEnt;
DWORD dwIPAddr;
LPSTR szIPAddr;

if(WSAStartup(WINSOCK_VERSION ,&wsaData))
{
MessageBox(NULL,"Could not load Windows Sockets DLL.",PROG_NAME,MB_OK|MB_ICONSTOP);
}
else
{
lpHostEnt=gethostbyname(HOST_NAME);
if(!lpHostEnt)
MessageBox(NULL,"Could not get IP address!",HOST_NAME,MB_OK|MB_ICONSTOP);
else
{
szIPAddr=inet_ntoa(*(LPIN_ADDR)*(lpHostEnt->h_addr_list ));
MessageBox(NULL,szIPAddr,lpHostEnt->h_name,MB_OK|MB_ICONINFORMATION);
}
dwIPAddr=inet_addr(HOST_ADDR);
if(dwIPAddr==INADDR_NONE)
MessageBox(NULL,"Invalid Internet address!",HOST_ADDR,MB_OK|MB_ICONSTOP);
else
{
lpHostEnt=gethostbyaddr((LPSTR)&dwIPAddr,PF_INET_LENGTH,PF_INET);
if(! lpHostEnt)
MessageBox(NULL,"Could not get host name!",HOST_ADDR,MB_OK|MB_ICONSTOP);
else
{
MessageBox(NULL,lpHostEnt->h_name,HOST_ADDR,MB_OK|MB_ICONINFORMATION);
}
}

}
WSACleanup();
return (NULL);
}
谢谢!小弟分不多了，尽量加分！一定一定。