Detecting when an internet connection is active

[fferland]

I need to know how I can detect whether the user currently has an active internet connection. Can anyone help? I've tried InetIsOffline(), but that only determines if the user is in online or offline mode, not if the actual connection is currently active.

[valikac]

One solution is to simply connect to a server. Kuphryn

[Todd Smith]

bool IsConnectedToInternet(void)
{
DEBUGF("IsConnectedToInternet");

WORD wVersionRequested = MAKEWORD(1, 1);
WSADATA	wsaData;
TCHAR hostaname\[1000\];
int	hostname\_size = sizeof(hostaname);
bool connected = false;

if (WSAStartup(wVersionRequested, &wsaData) != 0)
{
	DEBUGF("WSAStartup Failed (%i.%i) %s",
		wsaData.wHighVersion, wsaData.wVersion, wsaData.szDescription);
	return connected;
}

if (gethostname(hostaname, hostname\_size) != SOCKET\_ERROR)
{
	struct hostent FAR \*h = gethostbyname(hostaname);
	if (h != NULL)
	{
		// cif ip=127.0.0.1 then we are not connected
		DEBUGF("gethostname %s %s", h->h\_name, h->h\_addr\_list\[0\]);
		if (strncmp(h->h\_addr\_list\[0\], "\\x7f\\x0\\x0\\0x1", 4)!=0)
		{
			connected = true;
		}
	}
}
else
{
	DEBUGF("gethostname Failed");
}

WSACleanup();

return connected;

}

Todd Smith