Detecting (internet) connection status

I'm writing a program that relies on activation whenever the user goes online. I was wondering if there's a possible way to register my app with windows so that it gets a message (notification) whenever the user goes online (like dap/icq/whatever).

Thanks

I would do it like this. write a program that loads with windows(with the regestry or something). set a timer and let it check every minute or so if there is a connection. Not sure, but I think this is the way ICQ works.
here is the code for checking if you are connected to the net. I know this code worked a few months ago. And now it doesn't work anymore, don't know why(haven't search either). But I'll post it anyway. Maybe someone finds the error or maybe it works for you (if it does, let me know please)

Code:

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#include <ras.h>


bool IsConnected()
{
  LPRASCONN TRasCon;
  RASCONNSTATUS Tstatus;

  DWORD lg;
  DWORD lpcon;
  bool lReturn;

  TRasCon->dwSize = 412;
  lg = 256 * TRasCon->dwSize;
  lReturn = false;

  if( RasEnumConnections(TRasCon, &lg, &lpcon) == 0 )
  {
      Tstatus.dwSize = 160;
      RasGetConnectStatus(TRasCon->hrasconn, &Tstatus);

      lReturn = ( Tstatus.rasconnstate == 0x2000 );
  }

  return( lReturn );
}

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Code:

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#include <windows.h>
#include <tchar.h>
#include <ras.h>
#include <raserror.h>


int WINAPI WinMain(HINSTANCE hThisInst, HINSTANCE hPrevInst,
                  LPSTR lpszArgs, int nWinMode)
{
        RASCONN TRasCon ;
    RASCONNSTATUS Tstatus;
        DWORD lg = 0;
        DWORD lpcon = 0;
        TCHAR szStat[50],szString[] = _T("This system is ");
 
 
        TRasCon.dwSize = sizeof(TRasCon);
        lg = TRasCon.dwSize;//Set size for array of connections


        if( RasEnumConnections(&TRasCon, &lg, &lpcon) == 0 )//Find connection
                {
                        Tstatus.dwSize = sizeof(Tstatus);
                        RasGetConnectStatus(TRasCon.hrasconn,
                                &Tstatus);//Find Connection status

                        _tcscpy(szStat,
                                Tstatus.rasconnstate == RASCS_Connected?
                                _T("Connected"):_T("Not Connected"));
                       
                        _tcscat(szString,szStat);
                       
                        MessageBox(0,szString,_T("Connection status"),MB_OK);
                }

        return 0;

}

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That should work...

InetIsOffline() returns true if the system is not currently connected to the Internet, and false if it is. Include intshcut.h and link with url.lib.

Quote:

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Originally posted by maes
write a program that loads with windows(with the regestry or something). set a timer and let it check every minute or so if there is a connection

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This is exactly the method I'm currently using. I have a thread that checks the connection status every specified period of time.

I was looking for some (better) way that doesn't keep the CPU doing useless operations (I know it doesn't slow down noticably, but I just hate to reserve any CPU power when I don't need it).

I thought there would be some way that relies on windows messages/events/whatever...

Thanks for the help & the code :)
I guess I'll have to keep it as it is ( for now )

I think the function InternetConnectionStatus is the best one for this.
Ok , Coder have you received the email for the aoi or not that says that the test is at 16 March means after 3 days from now.
ok
amr

I'm not ramiliar with this ras.h lib. Does somebody have a link explaining the functions and usage of this lib?

Remote Access Server (I think)....as in DialUpServer...

Do a search on Google

Hmmm...so it's like WinSock?

Quote:

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Originally posted by Garfield
Hmmm...so it's like WinSock?

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Not entirely...but they do overlap of course