마음의 안정을 찾기 위하여

is_connect := InternetGetConnectedState(@param, 0);
If is_connect=True Then Begin
  // Internet 접속 상태
End;

BOOL InternetGetConnectedState(
  LPDWORD lpdwFlags,
  DWORD dwReserved
);
Parameters
lpdwFlags 
[out] Pointer to a variable that receives the connection description. This parameter may return a valid flag even when the function returns FALSE. This parameter can be one or more of the following values. 
Value
Meaning
INTERNET_CONNECTION_CONFIGURED
0x40
Local system has a valid connection to the Internet, but it might or might not be currently connected.
INTERNET_CONNECTION_LAN 
0x02
Local system uses a local area network to connect to the Internet.
INTERNET_CONNECTION_MODEM
0x01
Local system uses a modem to connect to the Internet.
INTERNET_CONNECTION_MODEM_BUSY
0x08
No longer used.
INTERNET_CONNECTION_OFFLINE 
0x20
Local system is in offline mode.
INTERNET_CONNECTION_PROXY
0x04
Local system uses a proxy server to connect to the Internet.
dwReserved 
[in] Reserved. Must be zero. 
Return Value
Returns TRUE if there is an active modem or a LAN Internet connection, or FALSE if there is no Internet connection, or if all possible Internet connections are not currently active. For more information, see the Remarks section.
When InternetGetConnectedState returns FALSE, the application can call GetLastError to retrieve the error code.