Re: How do i check for an internet connection?
On 11 Dec 2005, at 00:50, Alex Tweedly wrote: Jerry Daniels wrote: Kurt, I've been using this one since you posted it and i really like it. VERY fast. Thanks! Just remember - it often gets the wrong answer on some systems (e.g. mine). It believes I am always connected, even though about 50% of the time I'm not - because I have an in-house network (mix of Cat-5 and wifi) with an Internet connection which is *not* always connected. Alex, thanks as always for pointing out the limitations. Can I pick your knowledge a little further? Can the testForConnection function be assumed reliable for detecting a network connection of some sort, not necessarily the internet? I guess there are times when this might be sufficient. Cheers Dave ___ use-revolution mailing list use-revolution@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution
Re: How do i check for an internet connection?
Dave Cragg wrote: Just remember - it often gets the wrong answer on some systems (e.g. mine). It believes I am always connected, even though about 50% of the time I'm not - because I have an in-house network (mix of Cat-5 and wifi) with an Internet connection which is *not* always connected. Alex, thanks as always for pointing out the limitations. Sorry - was I sounding like a broken record ? And a negative one at that :-( It's just that if folks use it, and therefore wrongly think they are connected, then they (and perhaps I) get poor results (like Rev 2.5's IDE trying to use the RevOnline check, where it would hang for 30-60 seconds every time I tried to use it - BZ 2117, still open after 14 months). Can I pick your knowledge a little further? Can the testForConnection function be assumed reliable for detecting a network connection of some sort, not necessarily the internet? yes I guess there are times when this might be sufficient. I can't think of any circumstance that it is sufficient for anything meaningful. If there is something it helps with, I'd be happy to hear about it. (note you can have a network connection with nothing but a successful link status - i.e. a hub or switch, there is no certainty that any other computer is connected; I don't see how that is sufficient for anything). -- Alex Tweedly http://www.tweedly.net -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.371 / Virus Database: 267.13.13/197 - Release Date: 09/12/2005 ___ use-revolution mailing list use-revolution@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution
Re: How do i check for an internet connection?
On 11 Dec 2005, at 19:16, Alex Tweedly wrote: Sorry - was I sounding like a broken record ? And a negative one at that :-( Not at all. I really appreciate it. I think many of us are now having to or wanting to deliver things that have to work in various networked settings, and we can get carried away with our little bits of knowledge. Although I know something about things such as http and ftp protocols, I'm fairly ignorant about many aspects of networking. I'm glad for any pointers I can get (especially pointers to pitfalls). Can the testForConnection function be assumed reliable for detecting a network connection of some sort, not necessarily the internet? yes I guess there are times when this might be sufficient. I can't think of any circumstance that it is sufficient for anything meaningful. If there is something it helps with, I'd be happy to hear about it. I have nothing very practical in mind. But it's nice to store away these snippets of code with an accurate description of what they do. (note you can have a network connection with nothing but a successful link status - i.e. a hub or switch, there is no certainty that any other computer is connected; I don't see how that is sufficient for anything). Well, in a company setting, and the sales person has returned to the office from the road with his/her laptop, and has forgotten to plug it into the company network when he/she starts an app that requires a network connection... I guess it could perhaps give a better description of the problem than invalid host address. (Just thinking aloud here.) Cheers Dave ___ use-revolution mailing list use-revolution@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution
Re: How do i check for an internet connection?
Dave Cragg wrote: On 11 Dec 2005, at 19:16, Alex Tweedly wrote: Sorry - was I sounding like a broken record ? And a negative one at that :-( Not at all. I really appreciate it. I think many of us are now having to or wanting to deliver things that have to work in various networked settings, and we can get carried away with our little bits of knowledge. Although I know something about things such as http and ftp protocols, I'm fairly ignorant about many aspects of networking. I'm glad for any pointers I can get (especially pointers to pitfalls). Phew ! Thanks Dave - I was concerned that I was coming over as too negative too often on this topic. I have nothing very practical in mind. But it's nice to store away these snippets of code with an accurate description of what they do. (note you can have a network connection with nothing but a successful link status - i.e. a hub or switch, there is no certainty that any other computer is connected; I don't see how that is sufficient for anything). Well, in a company setting, and the sales person has returned to the office from the road with his/her laptop, and has forgotten to plug it into the company network when he/she starts an app that requires a network connection... I guess it could perhaps give a better description of the problem than invalid host address. (Just thinking aloud here.) I think that getting a negative result back from the test gives you the possibility of a better (and perhaps sooner) error message. I'll give some thought to how reliable that might be - but off the cuff, it seems safe to assume that if this test for network fails, then you really do have no network connection. But in general, getting a positive result from the test gives you effectively nothing. - even if there is a network connection, there may be no internet connection (or in your case, there may be no connectivity to the required part of the corporate network) - even if there is an internet connection, the part of the net you want may not be reachable -even if it is, the server may not be up and running - even if it is, the service (e.g. http) you want may not be up - even if it is, it may not accept your connection - even if it does, the file you want may be unavailable - even if .. And even if the internet connection is up, and the first request is satisfied, it may then die / become unreachable before, or during, a subsequent request. Bottom line : if you want to write a robust networked application, it should never do any blocking operation, should alway be prepared for errors (or delays) and should gracefully continue with other operations or user interactions in parallel with any attempted network operation. And if you do all that anyway, then the initial test was unnecessary :-) The exception might be, as you suggest, to give a better, quicker error response in some cases; whether that is worth the risk of unreliable or misleading error messages is up to the author of each app. -- Alex Tweedly http://www.tweedly.net -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.371 / Virus Database: 267.13.13/197 - Release Date: 09/12/2005 ___ use-revolution mailing list use-revolution@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution
Re: How do i check for an internet connection?
Kurt, I've been using this one since you posted it and i really like it. VERY fast. Thanks! Jerry Daniels Object Editing in a Tabbed Browser! http://www.daniels-mara.com/products/constellation.htm On Dec 6, 2005, at 8:06 PM, Kurt Kaufman wrote: I don't remember who to thank for this one, which I modified only slightly: on testForConnection put 255.255.255.255:43222 into testSocket open datagram socket to testSocket put hostAddress(testSocket) into theIPAddress close socket testSocket if theIPAddress is 127.0.0.1 then --it's the local machine address, so not connected --may insert connection routine here end testForConnection -Kurt ___ use-revolution mailing list use-revolution@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution ___ use-revolution mailing list use-revolution@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution
Re: How do i check for an internet connection?
Jerry Daniels wrote: Kurt, I've been using this one since you posted it and i really like it. VERY fast. Thanks! Just remember - it often gets the wrong answer on some systems (e.g. mine). It believes I am always connected, even though about 50% of the time I'm not - because I have an in-house network (mix of Cat-5 and wifi) with an Internet connection which is *not* always connected. -- Alex. -- Alex Tweedly http://www.tweedly.net -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.371 / Virus Database: 267.13.13/197 - Release Date: 09/12/2005 ___ use-revolution mailing list use-revolution@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution
Re: How do i check for an internet connection?
Marty Knapp wrote: What happens if a Rev standalone runs out of memory (it's all in RAM, right?) Does it page it out to disk or does it just run into the wall? (need to know for both OSX and XP) The engine uses virtual memory when necessary on all platforms. You should be fine. -- Jacqueline Landman Gay | [EMAIL PROTECTED] HyperActive Software | http://www.hyperactivesw.com ___ use-revolution mailing list use-revolution@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution
Re: How do i check for an internet connection?
Kurt Kaufman wrote: I don't remember who to thank for this one, which I modified only slightly: on testForConnection put 255.255.255.255:43222 into testSocket open datagram socket to testSocket put hostAddress(testSocket) into theIPAddress close socket testSocket if theIPAddress is 127.0.0.1 then --it's the local machine address, so not connected --may insert connection routine here end testForConnection That tests for having a *network* connection, but not for having an *Internet* connection. e.g. on my laptop, connected to my home network, this yields a value (today it's 192.168.1.67) regardless of whether the DSL line is connected and working or not. I'm not even sure it adequately tests for a network connection - on a machine with a single network port and a static IP address, I think it might return that IP address even if the network was disconnected. I don't have a suitable machine to test that out on, and anyway the test would be incomplete because it could vary between OSes. -- Alex Tweedly http://www.tweedly.net -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.362 / Virus Database: 267.13.11/191 - Release Date: 02/12/2005 ___ use-revolution mailing list use-revolution@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution
Re: How do i check for an internet connection?
Hi Kurt, I don't remember who to thank for this one, which I modified only slightly: Dar Scott published this code in march 2002: local testSock on mouseUp put 255.255.255.255:43222 into testSock open datagram socket to testSock -- opens immediately on Win2K put hostAddress(testSock) into field Local IP Address close socket testSock end mouseUp -- Sent from the Revolution - User forum at Nabble.com: http://www.nabble.com/How-do-i-check-for-an-internet-connection--t691676.html#a1841795 ___ use-revolution mailing list use-revolution@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution
Re: How do i check for an internet connection?
What happens if a Rev standalone runs out of memory (it's all in RAM, right?) Does it page it out to disk or does it just run into the wall? (need to know for both OSX and XP) Thanks, Marty Knapp ___ use-revolution mailing list use-revolution@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution
Re: How do i check for an internet connection?
Easiest way is to check if you can connect to a known site (e.g. Google). if the length of Xttp://www.google.com 0 then -- we're connected else -- we're not connected end if (Change Xttp to http) Nicholas Nginya wrote I am doing a cyber cafe billing system but how do i check for an internet connection. ___ use-revolution mailing list use-revolution@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution
Re: How do i check for an internet connection?
Bill, That will always return true. I think what you meant to say was: if the length of URL http://www.google.com; 0 then Unfortunately, this solution doesn't work with some proxy servers. -Chipp Bill Marriott wrote: Easiest way is to check if you can connect to a known site (e.g. Google). if the length of Xttp://www.google.com 0 then -- we're connected else -- we're not connected end if ___ use-revolution mailing list use-revolution@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution
Re: How do i check for an internet connection?
Nicholas Nginya wrote I am doing a cyber cafe billing system but how do i check for an internet connection. I've seen this one: function wellConnected return URL http://www.google.com/; empty end wellConnected ___ use-revolution mailing list use-revolution@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution
Re: How do i check for an internet connection?
Kurt, that's a little gem... nice, never thought of that, I did things like get URL http://www.soapdog.org/checknet.txt; and trapped for errors, of course this code breaks if my domain goes offline, but that code of yours, that holds! Cheers andre On Dec 7, 2005, at 12:06 AM, Kurt Kaufman wrote: I don't remember who to thank for this one, which I modified only slightly: on testForConnection put 255.255.255.255:43222 into testSocket open datagram socket to testSocket put hostAddress(testSocket) into theIPAddress close socket testSocket if theIPAddress is 127.0.0.1 then --it's the local machine address, so not connected --may insert connection routine here end testForConnection -Kurt ___ use-revolution mailing list use-revolution@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution ___ use-revolution mailing list use-revolution@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution
Re: How do i check for an internet connection?
I keep a one byte file on the same web server that the application is accessing and test that with URL call. Fast. Best, Jerry Daniels Tool makers for the 21st century http://www.daniels-mara.com/products On Dec 6, 2005, at 11:20 AM, Bill Marriott wrote: Easiest way is to check if you can connect to a known site (e.g. Google). if the length of Xttp://www.google.com 0 then -- we're connected else -- we're not connected end if (Change Xttp to http) Nicholas Nginya wrote I am doing a cyber cafe billing system but how do i check for an internet connection. ___ use-revolution mailing list use-revolution@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution ___ use-revolution mailing list use-revolution@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution
