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Hansi

BOOL InternetGetConnectedState(
    OUT LPDWORD lpdwFlags,
    IN DWORD dwReserved
);

Retrieves the connected state of the local system.

Returns TRUE if there is an Internet connection, FALSE otherwise.

lpdwFlags
Address of a double-word variable where the connection description should be returned.
Can be a combination of the following values:
INTERNET_CONNECTION_MODEM Local system uses a modem to connect to the Internet.
INTERNET_CONNECTION_LAN Local system uses a local area network to connect to the Internet.
INTERNET_CONNECTION_PROXY Local system uses a proxy server to connect to the Internet.
INTERNET_CONNECTION_MODEM_BUSY Local system's modem is busy with a non-Internet connection.

dwReserved
Reserved. Must be set to zero.

#include "Wininet.h" 
...
#pragma comment(lib,"wininet")
...

bool CSetTime2Dlg::CheckForConnection()
{
	BOOL isOnline = false;

	if (InternetCheckConnection("http://www.google.de",FLAG_ICC_FORCE_CONNECTION,0))
	{
		isOnline = true;
	}

	return(isOnline);
}