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网络编程常用知识

英乐 2022-08-09 阅读 51


1. 如何获取主机名

2. 如何从域名获取IP地址

3. 如何从struct in_addr和struct hostent结构中获取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( );

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