pSocket := INetDGramBind( nPort , , .T. , cIP_MAntonio, thanks! I would use getpeername() to check if the connection is at the moment online. But in a datagram-socket gives the function not the current state but rather the ip from creation from the socket.
#include <iostream>
#include <windows.h>
#include <wininet.h>
using namespace std;
int main(){
if(InternetCheckConnection(L"http://www.google.com",FLAG_ICC_FORCE_CONNECTION,0))
{
cout << "connected to internet";
}
return 0;
}Thanks Antonio!
In my case with a multicast-socket i only receive messages over the local LAN. This messages comes from time to time. The manufacturer from the hardware says to me, that all maximal 10 seconds the message is refreshed. So i wait maximal this 10 seconds and when no message received in this time i show the message: OFFLINE. This is for me enough information for the user.
very good