Internet Detection
Printed From: Codejock Forums
Category: Codejock Products
Forum Name: Toolkit Pro
Forum Description: Topics Related to Codejock Toolkit Pro
URL: http://forum.codejock.com/forum_posts.asp?TID=14587
Printed Date: 09 May 2024 at 8:15am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: Internet Detection
Posted By: tralfaz
Subject: Internet Detection
Date Posted: 21 June 2009 at 11:04am
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Hi I need to know if the computer is connected to the internet. I'm using Windows calls like: (FARPROC&)InetIsOffline = GetProcAddress(hURL, _T("InetIsOffline")); This barely works. Most of the time when my wifi is turned off, or cable unplugged, it still says I'm connected. Question: are there internet connection routines in the Toolkit? If so, are there examples? Thanks! |
Replies:
Posted By: SuperMario
Date Posted: 21 June 2009 at 12:26pm
| No, Toolkit does not have any such methods. |
Posted By: JantjeKeizer
Date Posted: 21 June 2009 at 3:37pm
| I had the same problems, then I simply tried pinging google, which has proven to be enough in my case. |
Posted By: tralfaz
Date Posted: 21 June 2009 at 4:30pm
| Could you show me how you did that? Thanks! |
Posted By: adrien
Date Posted: 22 June 2009 at 2:21am
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There's an "Event" SDK in windows from windows 2000 onwards that you can use to determine things like whether you have connectivity or not, and gives you indications when people log in or off, and power events (like going from utility to UPS power).
Other options are to do things like use IPHelper APIs to enumerate the system route table to see if you have a route to a host or not. I presume you want something that won't a) block b) cause a dial Cheers Adrien ------------- http://www.wingate.com - http://www.wingate.com |
Posted By: PPL1
Date Posted: 22 June 2009 at 1:01pm
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I use this function, and it works fine: Public Declare Function InternetGetConnectedState Lib "wininet.dll" (ByRef dwFlags As Long, ByVal dwReserved As Long) As Long Public Function IsOnline() As Boolean Dim LFlags As Long IsOnline = InternetGetConnectedState(LFlags, 0&) End Function |
Posted By: JantjeKeizer
Date Posted: 23 June 2009 at 3:08am
But it's not always reliable. The way I do it now is WSAStartup then gethostbyname and then WSACleanup |
PPL1 wrote:Posted By: tralfaz
Date Posted: 23 June 2009 at 10:47am
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I tried IsOnline = InternetGetConnectedState(LFlags, 0&) It's not reliable at all. I can unplug the cable and it still thinks its online. I think it caches something. I'll try the other suggestions. Thanks guys. |
Posted By: terrym
Date Posted: 25 June 2009 at 9:13am
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if ( InternetCheckConnection( "http://www.google.com", FLAG_ICC_FORCE_CONNECTION, 0 ) return TRUE;
this has worked for us without problems
------------- Thank you, Terry Mancey email terry@tmancey.ltd.uk | linkedin www.tmancey.ltd.uk | twitter @tmancey |
Posted By: tralfaz
Date Posted: 25 June 2009 at 9:37am
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but what if Google.com goes away (just kidding, haha) Nice and simple, I'll give it a shot. Thank you, Tra |
Posted By: JantjeKeizer
Date Posted: 25 June 2009 at 11:01am
If that's not important, then this is a good solution |
Posted By: terrym
Date Posted: 25 June 2009 at 1:02pm
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True, but I guess as we only support from Windows 2000 SP4+ we do not have that issue.
------------- Thank you, Terry Mancey email terry@tmancey.ltd.uk | linkedin www.tmancey.ltd.uk | twitter @tmancey |
Posted By: znakeeye
Date Posted: 26 June 2009 at 2:46am
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Pinging Google is a very ugly solution. Imagine if all applications did this. Soon you end up with a DoS attack... ------------- PokerMemento - http://www.pokermemento.com/ |
Posted By: JantjeKeizer
Date Posted: 26 June 2009 at 3:46am
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Posted By: terrym
Date Posted: 26 June 2009 at 4:49am
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That was the problem here, we just needed to detect if we had a connection (a real connection) and this was the only reliable method we could find :( if anybody knows of a better reliable method we will happily change our code :)
------------- Thank you, Terry Mancey email terry@tmancey.ltd.uk | linkedin www.tmancey.ltd.uk | twitter @tmancey |
Posted By: znakeeye
Date Posted: 26 June 2009 at 4:52am
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#include <Wininet.h> #pragma comment(lib, "wininet") BOOL isConnected = InternetGetConnectedState(INTERNET_CONNECTION_LAN | INTERNET_CONNECTION_MODEM, 0); ------------- PokerMemento - http://www.pokermemento.com/ |
Posted By: terrym
Date Posted: 26 June 2009 at 4:57am
Postitive we tried this, and the problem we found was if we disconnected the network cable it would still report as connected?
------------- Thank you, Terry Mancey email terry@tmancey.ltd.uk | linkedin www.tmancey.ltd.uk | twitter @tmancey |
Posted By: terrym
Date Posted: 26 June 2009 at 4:58am
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but will definately give this a go, once we have discovered :( why the White ribbon theme is not working :( on our application but it is in the Ribbon Sample SDI application
hopefully when Oleg replies to our support ticket he will have a solution as posted video to forum to show stange problem
------------- Thank you, Terry Mancey email terry@tmancey.ltd.uk | linkedin www.tmancey.ltd.uk | twitter @tmancey |
Posted By: JantjeKeizer
Date Posted: 26 June 2009 at 4:58am
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Posted By: znakeeye
Date Posted: 26 June 2009 at 4:58am
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Also, you might want to check some firewall settings before firing up a homepage etc. If you don't, some users will block your application. I believe the best approach is to notify the user before connecting to the Internet the first time.
http://www.vedivi.com/support/blog/72-configure-your-firewall-in-c.html - http://www.vedivi.com/support/blog/72-configure-your-firewall-in-c.html ------------- PokerMemento - http://www.pokermemento.com/ |
Posted By: znakeeye
Date Posted: 26 June 2009 at 5:01am
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You're right.
"A return value of TRUE from InternetGetConnectedState indicates that at least one connection to the Internet is available. It does not guarantee that a connection to a specific host can be established."
Have to do some research here. It seems odd that such a simple task is that hard... ------------- PokerMemento - http://www.pokermemento.com/ |
Posted By: terrym
Date Posted: 26 June 2009 at 5:02am
Cool we will add this to our range of software over the coming months as a great idea.
------------- Thank you, Terry Mancey email terry@tmancey.ltd.uk | linkedin www.tmancey.ltd.uk | twitter @tmancey |
Posted By: terrym
Date Posted: 26 June 2009 at 5:04am
Tell us about it, we had trouble finding a solution for a task that should have been very simple. Then we stumbled upon the method we use as above, which has worked perfectly but like you say we'd prefer a better solution.
------------- Thank you, Terry Mancey email terry@tmancey.ltd.uk | linkedin www.tmancey.ltd.uk | twitter @tmancey |
Posted By: znakeeye
Date Posted: 26 June 2009 at 5:05am
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I believe this is the right way of doing this:
InternetCheckConnection(NULL, FLAG_ICC_FORCE_CONNECTION, 0);
Who uses OS < Win2k?? ------------- PokerMemento - http://www.pokermemento.com/ |
Posted By: terrym
Date Posted: 26 June 2009 at 5:08am
We have also tried this method and it must have also failed in some circumstances. However yes I agree our applications require Windows 2000 (SP4+) and soon we will even drop Windows 2000 support.
------------- Thank you, Terry Mancey email terry@tmancey.ltd.uk | linkedin www.tmancey.ltd.uk | twitter @tmancey |
Posted By: znakeeye
Date Posted: 26 June 2009 at 5:22am
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http://www.gershnik.com/faq/manage.asp#internet - http://www.gershnik.com/faq/manage.asp#internet ------------- PokerMemento - http://www.pokermemento.com/ |
Posted By: znakeeye
Date Posted: 26 June 2009 at 5:45am
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How about this?
------------- PokerMemento - http://www.pokermemento.com/ |
Posted By: znakeeye
Date Posted: 26 June 2009 at 6:30am
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In my own software, I keep my WINVER set to 0x500, but I don't perform any tests on Win2k. That is, it should work in Win2k, but no guarantees. I think it's fair enough.
Did you test the function in my previous post? ------------- PokerMemento - http://www.pokermemento.com/ |
Posted By: terrym
Date Posted: 27 June 2009 at 10:20am
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Hi
Sorry not had chance as been trying to fix white theme. However will definately try this on monday, thanks ------------- Thank you, Terry Mancey email terry@tmancey.ltd.uk | linkedin www.tmancey.ltd.uk | twitter @tmancey |
Posted By: terrym
Date Posted: 28 June 2009 at 10:30am
Personally we check 3 main sites: Google, Microsoft and Yahoo to make sure ;) ------------- Thank you, Terry Mancey email terry@tmancey.ltd.uk | linkedin www.tmancey.ltd.uk | twitter @tmancey |
Posted By: Smucker
Date Posted: 01 July 2009 at 2:02pm
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You might want to try http://msdn.microsoft.com/en-us/library/ms738520%28VS.85%29.aspx - GetAddrInfo() for several known hosts. This will
avoid connecting to anything but the DNS server(s). Unfortunately, if
the DNS server is on a local network system, or all addresses are cached (there or on your local system) it might give back a valid
address even though outbound connections are down. You might want to experiment with sending it invalid or reserved IPV4 addresses; these may force a connection to a real (external) DNS server, and the error returns may be different depending on the local system's (or local network's) actual connection to the internet. I haven't experimented with that. ------------- Product: Xtreme Toolkit Pro version 13.2 (Unicode, static build) Platform: Windows 200x/XP/Vista/Win7 (32/64 bit) Language: Visual C++ 9.0 (Studio 2008) |