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Internet Addresses in MFC

Posted on 1998-11-14
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Last Modified: 2013-11-20
How would I go about taking a string (like "www.microsoft.com") and converting it into the dotted decimal system (like 127.0.0.1). Java has the function .getByName(), but I don't see that anywhere in VC++ 66.0. Any suggestions? TIA, Matt Lesko
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Question by:MattLesko
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jkr earned 50 total points
ID: 1324705
Use the Winsock function 'gethostbyname()'. It returns a 'struct HOSTENT' which has a member called 'h_addr' that holds the IP in binary form (network byte order!). If you need an example how to use it, feel free to ask...
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by:MattLesko
ID: 1324706
Sorry, but being new at this, I'd like to request a sample.
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LVL 86

Expert Comment

by:jkr
ID: 1324707
No problem ;-)
Here's your example:

WORD            wVersionRequested;
WSADATA            wsaData;
struct hostent      *pHostent = NULL;      
 
wVersionRequested = MAKEWORD( 1, 1);

if ( nErr = WSAStartup ( wVersionRequested, &wsaData))
{
  // error initializing winsck...      
}


if (!(pHostent = gethostbyname ( "www.microsoft.com")))
{
 // an error occured...
}
else
{
 printf ( "IP: %s\n", BinIP2StrIP ( *(( long *)  pHostent->h_addr));
}


char *BinIP2StrIP ( long lnIP)
{
static char s_acStrIP [      16];

PUCHAR      puc = ( unsigned char *) &lnIP;
unsigned int aun [ 4];

for ( int i = 0; i < 4; aun [ i++] = *puc++);

sprintf      ( s_acStrIP, "%d.%d.%d.%d", aun [ 0], aun [ 1], aun [ 2], aun [ 3]);

return ( s_acStrIP);
}
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