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| internet connection |
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This message was discovered on microsoft.public.dotnet.framework.windowsforms.
Responses highlighted in red are from those people who are likely to be able to contribute good, authoratitive information to this discussion. They include Microsoft employees, MVP's and others who IMHO contribute well to these kinds of discussions.
| 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
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| 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/>
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| 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]
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| 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
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