Listener on internet connection established

Question

5.00/5 (2 votes)

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.NET3.5

Hello,

I'm after some advise. I'm developing an application that runs on a windows 7 tablet with WiFi capabilities. I need to upload data when an internet connection is established.

I'm wondering if there is a method of firing a function call when an internet connection is established. The only idea I have had so far is a background thread which pings a web address at set intervals and when it makes a connection do my processing but this seems a little wasteful as it could be hours before an internet connection is established again.

I was wondering if anyone can direct me towards a more elegant solution?

Thanks

Posted 12-Mar-12 10:46am

merridus

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2 solutions

Solution 2

Hi,

in addition to Shahins solution it seems there's a method to check internet connection when P/Invoking wininet.dll.

C#

[DllImport("wininet.dll", SetLastError = true)]
static extern bool InternetCheckConnection(string lpszUrl, int dwFlags, int dwReserved);

http://msdn.microsoft.com/en-us/library/windows/desktop/aa384346%28v=vs.85%29.aspx[^]

Easy to try, maybe it's working for you.

A second idea could be to check if user has started his browser. Something like if Process Firefox or ie is executed, or a process you pretty surly know that's executed on connection (maybe proof as a windows service), begin your uploading.

A third idea could be using a method that matches your requirements from the wifi wlanapi.dll.

Regards

Posted 12-Mar-12 14:52pm

El_Codero

Updated 12-Mar-12 17:13pm

v4

Comments

merridus 13-Mar-12 4:49am

Hello,

Thank you, I'd discovered that function and I've used a NetworkAvailablilityChanged listener with it and it seems to accurately tell me when the machine is connected to a network and if the internet is available. This should set me on my way.
Thanks.

El_Codero 13-Mar-12 6:24am

Good news that it works for you. Regards

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Shahin Khorshidnia · Accepted Answer · 2012-03-12T11:20:00

Solution 1

I know there is a delegate for network connections like NetworkAvailabilityChanged. But I don't have any idea about a delegate for internet connection or an API. Because if it had existed, the Windows(OS) could have used it for itself. You know windows has a little delay to understand it has been disconnected from the internet.
The chief problem is the internet is based on Request and Response, then how could you check the internet avaiiability, without requesting and responsing from a remote server through the internet?!

Posted 12-Mar-12 11:20am

Shahin Khorshidnia

Updated 12-Mar-12 11:33am

v3

Comments

merridus 12-Mar-12 17:29pm

Thank you for this, I hadn't seen this function. I imagine I could combine this with pinging a web address to confirm an active internet connection when it has been confirmed that it's actually connected to a network.

Shahin Khorshidnia 12-Mar-12 17:33pm

Yes, but I used it before and I had a little problem with multi network connections and I didn't follow it. It's about 2 years ago. I hope you can do it.