1. 如何獲取主機名
2. 如何從域名獲取IP地址
3. 如何從struct in_addr和struct hostent結構中獲取IP地址
WORD wVersionRequested;
WSADATA wsaData;
int err;
wVersionRequested = MAKEWORD( 2, 2 );
err = WSAStartup( wVersionRequested, &wsaData );
if ( err != 0 ) {
/* Tell the user that we could not find a usable */
/* WinSock DLL. */
return FALSE;
}
/* Confirm that the WinSock DLL supports 2.2.*/
/* Note that if the DLL supports versions greater */
/* than 2.2 in addition to 2.2, it will still return */
/* 2.2 in wVersion since that is the version we */
/* requested. */
if ( LOBYTE( wsaData.wVersion ) != 2 ||
HIBYTE( wsaData.wVersion ) != 2 ) {
/* Tell the user that we could not find a usable */
/* WinSock DLL. */
WSACleanup( );
return FALSE;
}
char hostname[255];
struct hostent *hst = gethostbyname(www.126.com) ;
struct in_addr ia;
if(hst != NULL)
{
memcpy(&ia.s_addr,hst->h_addr_list[0],sizeof(ia.s_addr));
int iIpLength = strlen(inet_ntoa(ia)) + 1;
char* lpcIp = new char[iIpLength];
ZeroMemory(lpcIp,iIpLength);
strcpy(lpcIp,inet_ntoa(ia));
delete []lpclp;
}
int i = gethostname(hostname, 255);
WSACleanup( );