已给域名，如何转换为IP?

[tiger0120]

如：
www.263.net

怎么转换为IP表示？

[醉马不肖]

gethostbyname
The gethostbyname function retrieves host information corresponding to a host name from a host database.

[hold]

WORD wVersionRequested = MAKEWORD(1, 1);
WSADATA wsaData;
WSAStartup(wVersionRequested, &wsaData);
hostent* pHostent = gethostbyname("www.263.net\0");
sockaddr_in sa;
memcpy(&sa.sin_addr.s_addr,pHostent->h_addr_list[0],pHostent->h_length);
CString sIP = inet_ntoa(sa.sin_addr);//IP

[huaboy408]

struct hostent FAR * gethostbyname (
const char FAR * name
);

Parameters
name
[out] A pointer to the null-terminated name of the host to resolve.

[hold]

#include "Winsock2.h"

库：Ws2_32.lib

最后再调用一个WSACleanup();

[tiger0120]

谢谢！
还有一些头文件？

[changlele]

网上有Ping命令的代码
http://community.csdn.net/Expert/TopicView1.asp?id=3143984

[huaboy408]

int Ping(LPCSTR pstrHost)
{
CString res;
SOCKET rawSocket;
LPHOSTENT lpHost;

// 创建原始套接字
rawSocket = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
if (rawSocket == SOCKET_ERROR)
{
AfxMessageBox("原始套接字创建失败!\r\n");
return 0;
}

// Lookup host
lpHost = gethostbyname(pstrHost);
if (lpHost == NULL)
{
res.Format("主机%s找不到\r\n!",pstrHost);
AfxMessageBox(res);
return 0;
}
}