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internet connection

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Konrad

Hi

I'am checking in separate thread does the connection with
internet is estabilished. But program freezes
for 2-3 secs. How to do that user
doesn't feel this checking?

thanks
Konrad

Reply to this message...

Herfried K. Wagner [MVP] (VIP)

* "Konrad" <Click here to reveal e-mail address> scripsit:
[Original message clipped]

How do you check if the connection is established?

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://dotnet.mvps.org/dotnet/faqs/>

Reply to this message...

Konrad

I found this method and it is quick

//Creating the extern function...

[DllImport("wininet.dll")]

private extern static bool InternetGetConnectedState(

out int Description, int ReservedValue ) ;

public static bool IsConnectedToInternet( )

{

int Desc ;

return InternetGetConnectedState( out Desc, 0 ) ;

}

and previous method

public static bool IsInternetConnected(string url)

{

bool FoundUrl = true;

try

{

WebRequest req;

WebResponse result;

Stream ReceiveStream;

Encoding encode;

StreamReader sr;

req = WebRequest.Create(url);

req.Timeout = 5000;

result = req.GetResponse();

ReceiveStream = result.GetResponseStream();

encode = System.Text.Encoding.GetEncoding("utf-8");

sr = new StreamReader(ReceiveStream, encode);

}

catch(System.Exception e)

{

FoundUrl = false;

}

return FoundUrl;

}

Thanks

Konrad

"Herfried K. Wagner [MVP]" <Click here to reveal e-mail address> wrote in message
news:Click here to reveal e-mail address...
[Original message clipped]

Reply to this message...

MuZZY

Konrad wrote:

[Original message clipped]

Hi Konrad,

Well, i've seen in a few articles that using any windows api functions
to test internet connection isn't reliable anyway - at the most it will
say that you are connected, but it can't check either it's just a LAN
connection, or internet.

What i would do is try to establish a conection with a well nown web
site, say yahoo or google using System.Net.HttpWebRequest class.
I am not sure if it's a synchronous or asynchronous socket connection,
but anyway you can launch it in a separate thread.
I remember myself doing that back in Delphi couple years ago, and it
worked fine!

Andrey

Reply to this message...

	System.Exception
	System.IO.StreamReader
	System.Net.HttpWebRequest
	System.Net.WebRequest
	System.Net.WebResponse
	System.Text.Encoding

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