How to detect if you are connected to internet?

kfaday

Hi, i'm creating a jabber client (a chat tool, like icq or msn). In the app, i send info to a server, and i receive from it. I use MFC CSocket. Is there any api function that checks if you are connected to internet? thanks!!!

224917

InternetGetConnectedState

It's not a bug, it's an undocumented feature.
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kfaday

thanks! i looked it up in msdn ( http://msdn.microsoft.com/library/?url=/library/en-us/wininet/wininet/internetgetconnectedstate.asp) , and i don't understand the following: lpdwFlags [out] Pointer to a variable that receives the connection description. This parameter can be one or more of the following values. Value Meaning INTERNET_CONNECTION_CONFIGURED Local system has a valid connection to the Internet, but it might or might not be currently connected. INTERNET_CONNECTION_LAN Local system uses a local area network to connect to the Internet. INTERNET_CONNECTION_MODEM Local system uses a modem to connect to the Internet. INTERNET_CONNECTION_MODEM_BUSY No longer used. INTERNET_CONNECTION_OFFLINE Local system is in offline mode. INTERNET_CONNECTION_PROXY Local system uses a proxy server to connect to the Internet. INTERNET_RAS_INSTALLED Local system has RAS installed. the following code always returns online.. any ideas?

unsigned long \*a;
a=(unsigned long \*)malloc(sizeof(unsigned long));
if (TRUE==InternetGetConnectedState(a,0))
	AfxMessageBox("online");
else
	AfxMessageBox("offline");

David Crow

kfaday wrote: I use MFC CSocket. Over CAsyncSocket? Why? kfaday wrote: Is there any api function that checks if you are connected to internet? See here.

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

vcplusplus

Check out this article http://tangentsoft.net/wskfaq/articles/csocket.html

David Crow

And your point is? I'm aware of the downfalls of using CSocket, some of which aren't even mentioned in your article, but perhaps the OP is not.

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Michael Dunn

See the FAQ 8.7 How do I tell if the computer is connected to the Internet?[^] --Mike-- Personal stuff:: Ericahist | Homepage Shareware stuff:: 1ClickPicGrabber | RightClick-Encrypt CP stuff:: CP SearchBar v2.0.2 | C++ Forum FAQ ---- "Just because the box has 2 gigabytes of memory doesn't mean you get to use it all!" -- Rico Mariani, CLR perf guy

palbano

You know what would be great is if you could search for stuff on the internet instead of waiting for some nice person like you to provide a link to the page(s) of interest. :omg::zzz: But, that's just my opinion... I could be wrong.

kfaday

thanks for the link to the faq

#include .
.
.

BOOL bConnected;
DWORD dwFlags;

bConnected = InternetGetConnectedState ( &dwFlags, 0 );

if ( bConnected )
if ( dwFlags & INTERNET_CONNECTION_OFFLINE )
bConnected = FALSE;

i get this error: error C2065: 'INTERNET_CONNECTION_OFFLINE' : undeclared identifier any ideas? thanks!