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Detecting if the computer is on-line

Posted on 2000-04-03
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Last Modified: 2013-11-20
The function InternetOpenUrl () generates a Dial-up Connection dialog box.  If you select cancel it flashes back up twice more.

How do I detect the user has selected cancel and avoid flashing up irritating Dial-up Connection dialog box.
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Question by:denmead
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7 Comments
 
LVL 9

Expert Comment

by:cdesigner
ID: 2681303
use Ping
try to find code for Ping on codeguru - many, many classes can make this
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LVL 31

Accepted Solution

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Zoppo earned 150 total points
ID: 2682965
Hi denmead,

since NT4 and Win95 there's an API command InternetGetConnectedState().
To use it you'll have to include 'wininet.h' and link with 'wininet.lib'.

See MSDN article ID: Q242558 for further infos on this...

hope that helps,

ZOPPO
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LVL 9

Expert Comment

by:ShaunWilde
ID: 2683732
ZOPPO

I think InternetGetConnectedState has been broken in IE5 - my program which works perfectly well with IE4 does not work with IE5.

If the app is running and IE goes offline - then my app notices this. However if my app is started when IE is offline my app will actually say IE is online.

Could you check this and make sure I am not going mad. (only if you have time of course - If you think I should, I'll post it as a question but, I am not sure how to phrase it or how to judge the answer)

Whenever anyone asks this question 'our' response is always to say InternetGetConnectedState etc and I want to make sure we are not giving duff advice.

I think it is related to the wininet library being initialised for the first time for an app - but I can't put my finger on it.

My simple test app was a dialog only app with a 1 second WM_TIMER message going off and it was displaying its info (dwState) to a CStatic. and the only function it called was InternetGetConnectedState(...).

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LVL 9

Expert Comment

by:ShaunWilde
ID: 2683860
ZOPPO

I think InternetGetConnectedState has been broken in IE5 - my program which works perfectly well with IE4 does not work with IE5.

If the app is running and IE goes offline - then my app notices this. However if my app is started when IE is offline my app will actually say IE is online.

Could you check this and make sure I am not going mad. (only if you have time of course - If you think I should, I'll post it as a question but, I am not sure how to phrase it or how to judge the answer)

Whenever anyone asks this question 'our' response is always to say InternetGetConnectedState etc and I want to make sure we are not giving duff advice.

I think it is related to the wininet library being initialised for the first time for an app - but I can't put my finger on it.

My simple test app was a dialog only app with a 1 second WM_TIMER message going off and it was displaying its info (dwState) to a CStatic. and the only function it called was InternetGetConnectedState(...).

0
 

Author Comment

by:denmead
ID: 2684956
I don't think ping is the way to do it.

I like the look of the InternetGetConnectedState () so I think I will try that.

Q242558 says use InternetOpenURL () when you want to try to connect.  But this give three dial-up dialog boxes if you click on cancel.

IE5 gives a dialog box with an off-line button.

How do they do that?

0
 

Author Comment

by:denmead
ID: 2685049

I've found what looks like a good answer to my question at:

http://msdn.microsoft.com/workshop/components/offline/offline.asp
0
 

Author Comment

by:denmead
ID: 2685054
Thanks Zoppo you pointed me in the right direction
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